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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Baraldo, Kleber Barrionuevo;

    Pós-graduação em Biodiversidade Aquática - São Vicente Estuários são ambientes heterogêneos, altamente complexos, e condicionados por diversos fatores ambientais. Nenhum estuário é igual a outro, e é esta diversidade que os torna tão importantes do ponto de vista da conservação. A grande quantidade de recursos naturais disponíveis nesses ambientes favorece o desenvolvimento de assentamentos urbanos nas suas margens, podendo comprometer o equilíbrio natural. A partir do conhecimento detalhado dos sistemas estuarinos é possível traçar metas assertivas para a conservação e gestão destes ambientes tão singulares. O presente estudo visa a caracterização e comparação dos estuários dos rios Itaguaré e Guaratuba (Bertioga, SP) quanto aos seus parâmetros geo-físico-químicos. A área de estudo está localizada na planície costeira da Bacia Hidrográfica da Baixada Santista e inserida no Parque Estadual Restinga de Bertioga. Foram realizados levantamentos semestrais de batimetria e imageamento com sonar de varredura lateral, com o intuito de conhecer as profundidades e feições de fundo dos estuários, avaliando a dinâmica de processos erosivos e deposicionais. Medições mensais de salinidade, temperatura e turbidez foram realizadas ao longo de um ano, visando avaliar o comportamento sazonal da intrusão salina e da zona de máxima turbidez. Para verificar variações na granulometria, foram coletadas amostras de sedimentos nos mesmos pontos de medição das variáveis físico-químicas da água. Os resultados foram avaliados de forma integrada, utilizando técnicas de geoprocessamento e análise espacial, em conjunto com dados secundários de maregrafia e precipitação, analisando-se a influência de fatores meteoceanográficos na coluna d’água e na configuração do fundo ao longo desses ambientes. A comparação das batimetrias demonstrou que as regiões mais próximas da cabeceira de ambos estuários são influenciadas pela dinâmica fluvial, havendo erosão do fundo durante o inverno. Próximo à foz, o Itaguaré apresenta uma elevada dinâmica nos bancos de areia associada à ressacas. As feições de fundo apresentaram relação com a granulometria, e foi possível determinar regiões com sedimentos arenosos e areno-lamosos ao longo de ambos os estuários. A análise conjunta de dados de turbidez, granulometria e imageamento de fundo permitiram identificar a zona de máxima turbidez a cerca de 3,5 km da foz em ambos estuários. O estuário do rio Itaguaré é mais influenciado por eventos de ressaca, e o estuário do rio Guaratuba pela variação sazonal de precipitação na sub-bacia. O estuário do rio Itaguaré foi classificado como parcialmente misturado, ou de cunha salina (dependendo das condições), enquanto que o estuário do rio Guaratuba variou entre parcialmente misturado e bem misturado segundo a classificação de Pritchard (1955). Os dados de geomorfologia, batimetria e zonação dos estuários poderão subsidiar o gerenciamento e o uso sustentável destes locais, assim como avaliar o impacto de modificações nos parâmetros geo-físico-químicos ocasionadas por ações antrópicas em ambientes estuarinos. Estuaries are highly complex heterogeneous environments, conditioned by different environmental factors. Every estuary has particular characteristics, and this diversity makes them so important for conservation. The great amount of available natural resources in these environments contributes to urban settlement developments on their surroundings, which may compromise their natural balance. Detailed knowledge of estuarine systems helps establish assertive goals for the conservation and management of these unique environments. This study aims to characterize and compare Itaguaré and Guaratuba estuaries (Bertioga, SP) regarding their geophysical-chemical characteristics. The study area is located on the Baixada Santista Basin’s coastal plain, and inserted in the Restinga of Bertioga State Park. Biannual bathymetry and side scan sonar surveys were carried in order to evaluate erosive and depositional processes affecting depths and bottom features of the estuaries. Salinity, temperature and turbidity measurements were carried out monthly over a period of one year to evaluate seasonal behavior of saline intrusion and the estuarine turbidity maximum. Sediment samples were collected in order to verify granulometry variations. Results were evaluated in an integrated manner, using geoprocessing and spatial analysis techniques, coupled with secondary data of mareography and precipitation, analyzing the influence of meteoceanographic factors in the water column and the background configuration along these environments. Bathymetry analysis showed that regions close to estuaries heads (in both cases) are influenced by river dynamics, demonstrating bed erosion during winter. Near the mouth, the Itaguaré presents high dynamics of sand banks associated with storm surges caused by the strong oceanic winds. Bottom features were associated to granulometry, and it was possible to determine regions with sand and mud-sand sediments along both estuaries. The combined analysis of turbidity, granulometry and side scan imagery showed the estuarine turbidity maximum at about 3.5 km from the mouth of both estuaries. The Itaguaré River estuary is mainly influenced by storm surge events than the Guaratuba River estuary, which is more influenced by seasonal variation of precipitation in the watershed. Itaguaré estuary was classified as partially mixed, or salt wedge estuary (depending on the conditions), while Guaratuba ranged between partially mixed and well mixed estuary, according to Pritchard (1955) classification. The knowledge about geomorphological, bathymetric and estuarine zonation characteristics, contributes to sustainable management and use of these environments, and will help to estimate the impact of anthropogenic changes in geophysical-chemical parameters in estuaries.

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    Authors: Gagg, Gilberto;

    Dados de gravimetria e de altimetria por satélite foram usados como subsídio à análise morfoestrutural na região da Bacia de Pelotas-RS. Na abordagem gravimétrica foi usado o modelo geopotencial EGM2008 através das anomalias Bouguer e na abordagem batimétrica foi usado o modelo global DTU10BAT. Através dos mapas de anomalias Bouguer e perfis gravimétricos gerados, verificou-se que as anomalias Bouguer aumentam positivamente da costa em direção às maiores profundidades oceânicas, o que caracteriza um progressivo afinamento crustal associado à deriva continental. O comportamento das anomalias Bouguer obtidas por dados satelitais evidenciaram a presença de uma ruptura conhecida como Charneira Albo-aptiana na plataforma continental. A incidência de valores de anomalias significativamente positivas na região do Baixo de Mostardas sugere a presença de uma massa de maior densidade nesta região. A resolução dos dados gravimétricos utilizados não permitiu evidenciar a presença de paleocanais na região, sendo necessária uma maior resolução espacial, associada a outros métodos de investigação. O uso de dados de altimetria por satélite (modelo DTU10BAT) permitiu a análise batimétrica da plataforma continental e a investigação da configuração morfológica da região, que foi dividida em três faixas: Torres- Farol Solidão, Farol Solidão-Farol da Conceição e Farol da Conceição-Farol Sarita. Foi gerado um modelo teórico e comparado com o modelo DTU10BAT na geração do mapa de anomalias batimétricas. Os eixos de anomalias batimétricas negativas identificados estão frequentemente associados à direção de paleodrenagens, assim como as anomalias positivas tem relação com linhas de paleoestabilizações do nível do mar ou altos estruturais. Foi definida uma sequência de descontinuidades na altura do Farol da Conceição que apresentou expressiva coincidência com paleocanais delineados na mesma região através de outros estudos. Todos os dados foram processados e integrados em um sistema de informações geográficas. Os dados gravimétricos e batimétricos oriundos de missões satelitais são uma grande ferramenta nos estudos regionais para áreas que envolvam aplicações geológicas e mesmo oceanográficas. Data from satellite altimetry and gravity were used to the morphostructural analysis in the Pelotas Basin-RS region. The EGM2008 geopotential model through the Bouguer anomalies was used in the gravimetric approach and the DTU10BAT global model was used in the bathymetric approach. Through the Bouguer anomalies maps and the gravimetric profiles that were generated, it was observed that Bouguer anomalies increase positively from coast towards to the major ocean depths, what characterizes a progressive crustal thinning associated with the continental drift. The behavior of the Bouguer anomalies obtained from satellite data showed the presence of a rupture, known as Charneira Albo-Aptiana, on the continental shelf. The incidence of significant positive anomalies values on the Baixo de Mostardas region suggests the presence of a higher-density mass in this region. Because of the resolution of the gravimetric data used in this research was not enough, it was not possible to show the presence of paleochannels in the region, requiring a greater spatial resolution data, associated with other methods of investigation. The use of satellite altimetric data (model DTU10BAT) allowed the bathymetric analysis of the continental shelf and the research of morphological configuration of the region, which was divided into three areas: Torres- Solidão Lighthouse, Solidão Lighthouse-Conceição Lighthouse and Conceição Lighthouse-Sarita Lighthouse. A theoretical model was generated and it was compared with the DTU10BAT model in the generation of the bathymetric anomalies map. The axes of negative bathymetric anomalies identified are often associated with the direction of paleochannels, as well as the positive anomalies are related to lines of sea level paleostabilizations or structural highs. It was defined a sequence of discontinuities at the Conceição Lighthouse proximities which presented a significant coincidence with paleochannels that were delineated in the same region through other studies. The data were processed and integrated in a geographic information system. Gravimetric and bathymetric data from satellite missions are an important tool in regional studies for areas that involve geological and oceanographic applications.

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    Authors: Faria, Sandro Henrique de; Rodrigues, Dalto Domingos; Medeiros, Nilcilene das Graças; Aranha, Paulo Roberto Antunes;

    Este trabalho tem como objetivos avaliar o desempenho do GPR (Ground Penetrating RADAR) para aplicações batimétricas em ambiente controlado e do aplicativo “GPR Bathymetry”, desenvolvido para análise de radargramas batimétricos. O estudo foi realizado em uma caixa de decantação da estação de tratamento de água da qual se tem o “as-built”, obtido com estação total, que será empregado nos testes de validação. Realizaram-se três testes de comparação: comparações pontuais; entre Modelos Digitais de Elevação (MDE) gerados a partir do interpolador Topo to Raster; e entre os volumes calculados a partir dos MDE’s. Na comparação pontual a maior amplitude de discrepância entre as médias foi de 8cm. Para a amostra de discrepâncias entre os MDE’s, a amplitude foi de 9cm, média de 2cm, acurácia estimada de 4cm e o RMS de 3cm. Na comparação volumétrica obteve-se o valor de 800,6m³ com dados de referência e 806,4m³ com dados do GPR, resultando numa diferença de 1% entre os modelos. Conclui-se que para um reservatório construído em concreto armado, profundidades variando de 3 a 3,5 metros, o levantamento do relevo submerso empregando um GPR apresentou resultados promissores e um MDE com acurácia estimada de 4cm e discrepâncias de até 9cm This paper aims to evaluate the performance of the GPR (Ground Penetrating Radar) for bathymetric applications in a controlled environment, as well as evaluate the “GPR Bathymetry” software designed to bathymetric radargrams analysis. The study was realized in a decanting water treatment plant (WTP), where has the as-built obtained with total station, it will be used in validation tests. Was realized three comparison tests: from points comparisons; from Digital Elevation Models (DEM) generated from interpolating Top to Raster; and between volumes calculated from DEMs. In the point comparison, the greatest difference between averages was 8 cm. For the discrepancies sample between DEMs, the amplitude was 9 cm, average of 2 cm, estimate accuracy of 4 cm and RMS equal to 3 cm. In the volumetric comparison, we obtained the amount of 800.6 m³ with reference data and 806.4 m³ with the GPR data, resulting in a 1% difference between models. We conclude that for a reservoir built in reinforced concrete, depths ranging from 3 to 3.5 meters, the survey of the bottom relief employing a GPR showed promising results and a DEM with an estimate accuracy of 4 cm and discrepancies that may reach 9 cm

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    Authors: Ferreira, Italo Oliveira;

    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Over 80% of international trade is transported by waterways and Brazil is no different. Only this statement might already be sufficient to justify any study on the area of marine geodesy. However, especially in Brazil knowledge about the reliefs submerged is still scarce. Such knowledge is acquired through bathymetric surveys, focus of this work. The methodology exposed covers all stages of realization of a singlebeam bathymetric survey, fully automated: data collection by applying a dual frequency echo sounder and technical RTK (Real Time Kinematic), processing, data analysis and generation Model Digital Depth (MDP) of an impoundment of Ribeirão São Bartolomeu located on the campus of UFV. At work methods are used for topography and bathymetry data acquisition on the relief of the site and the depth of the impoundment. These were processed and analyzed for the subsequent generation of MDP using deterministic and probabilistic interpolators. Regarding the three-dimensional modeling of the relief submerged studies have been performed to quantify the errors in the modeling through automatic kriging and compare the efficiency of kriging and inverse distance weighted in different sampling grids. It was found that the bathymetric surveys have ideal characteristics for the application of geostatistics. As main results verified that the Kriging systematically conducted by the analyst respecting all the conditions required by it, the bathymetry location represented more accurately compared to other methods studied. Through this work it was also possible to obtain an estimate of the volume of water and sludge reservoir fluidly deposited on the submerged bottom. Mais de 80% do comércio internacional é transportado por vias aquáticas e no Brasil não é diferente. Somente esta afirmação já poderia ser suficiente para justificar qualquer estudo relativo à área de Geodésia Marinha. Contudo, principalmente no Brasil, o conhecimento a cerca dos relevos submersos ainda é escasso. Tal conhecimento é adquirido através de levantamentos batimétricos, foco deste trabalho. A metodologia exposta abrange todas as etapas de realização de um levantamento batimétrico monofeixe, totalmente automatizado: coleta dos dados aplicando um ecobatímetro de duas frequências e técnica RTK (Real Time Kinematic), o processamento, a análise dos dados e a geração do Modelo Digital de Profundidade (MDP) de um represamento do Ribeirão São Bartolomeu localizado no campus da UFV. No trabalho são utilizados métodos de topografia e batimetria para a aquisição de dados sobre o relevo do local e da profundidade do represamento. Estes foram processados e analisados para a posterior geração do MDP utilizando interpoladores determinísticos e probabilísticos. No que concerne à modelagem tridimensional do relevo submerso foram realizados estudos visando quantificar os erros cometidos na modelagem através da krigagem automática e comparar a eficiência da krigagem e do inverso ponderado da distância em diferentes GRIDs amostrais. Foi possível constatar que os levantamentos batimétricos apresentam características ideais para a aplicação da Geoestatística. Como resultados principais verificou-se que a Krigagem sistemática, realizada pelo analista respeitando-se todos os pressupostos exigidos pela mesma, representou a batimetria local de forma mais acurada comparativamente aos outros métodos estudados. Através deste trabalho também foi possível obter uma estimativa do volume de água do reservatório e de lama fluídica depositada no fundo submerso.

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    Authors: Krug, Lilian Anne; Noernberg, Mauricio Almeida;

    Baixios representam riscos a navegação no interior dos estuários. Portanto, devem ser bem delineados e tais informações devem ser freqüentemente atualizadas. Métodos hidrográficos tradicionais têm dificuldade em cobrir áreas rasas devido sua extensão e relevo. Uma alternativa é o uso de imagens de satélites para mapear essas áreas, com as vantagens de baixo custo e rápido resultado. No setor norte do Complexo Estuarino de Paranaguá o último levantamento batimétrico foi realizado na década de 50 e um novo mapeamento destas áreas, mesmo sem a acurácia das cartas náuticas, é de utilidade para o planejamento de estudos, modelagem ambiental e navegação de pequenas embarcações. Este estudo teve o objetivo de avaliar o potencial de gerar mapa batimétrico das áreas rasas da Baía das Laranjeiras, através do sensoriamento remoto. A aplicação deste método é fácil e mostrou-se bastante útil em regiões onde não existem dados batimétricos ou estes precisam ser atualizados. O mapa obtido é bastante fiel dentro dos limites batimétricos que se pretende, entre 0,36 e 4,5 m de profundidade, principalmente considerando que 75% do complexo estuarino possui profundidade inferior a 5 m. Shallow waters represent potential risks to navigation inside estuaries. Therefore, they must be well described and data must be always updated. Traditional hydrographic methods have difficult to cover shallow areas due to them extension and low relief. An alternative is the use of satellite images for mapping the areas, with the advantage of low cost and quick results. In the north area of the Paranaguá Estuarine Complex the last bathymetric survey was in the 50's so a new bathymetric mapping of these areas, even without the nautical chart's accuracy, is useful for studies planning, environmental modeling and small boats navigation. This study had the objective of generate bathymetric map of shallow areas in the Laranjeiras bay through remote sensing. The application of this method is not difficult and could be very useful in regions were there is no bathymetric data or need to be updated. The map obtained is very realistic inside the limits of 0,36 to 4,5 m water depth and important considering that nearly 75% of the Paranaguá Estuarine Complex have depths less than 5 m.

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    Authors: Zani, Hiran; Assine, Mario Luis; Silva, Aguinaldo;

    The Paraguay River is the main tributary of the Paraná River and has an extension of 1.693 km in Brazilian territory. The navigability conditions are very important for the regional economy because most of the central-west Brazilian agricultural and mineral production is transported by the Paraguay waterway. Increased sedimentation along the channel requires continuous dredging to waterway maintenance. Systematic bathymetric surveys are periodically carried out in order to check depth condition along the channel using echo-sounding devices. In this paper, digital image processing and geostatistical analysis methods were used to analyze the applicability of the ASTER sensor to estimate channel depths in a segment of the upper Paraguay River. The results were compared with field data in order to choose the band with better adjustment and to evaluate the standard deviation. Comparing the VNIR bands, the best fit was presented by the red wavelength (band 2; 0,63 - 0,69 μm), showing a good representation of the channel depths shallow than 1,7 m. Applying geostatistical methods, the model accuracy was enhanced from 43 cm to 36 cm and undesired components were slacked. It was concluded that the digital number of band 2, converted to bathymetry information allows a good estimation of river depths and channel morphology. O rio Paraguai é o principal tributário do rio Paraná, percorrendo uma extensão de 1.693 km em território brasileiro. O rio é de grande importância para a economia da Região Centro-Oeste, sendo uma das principais vias de escoamento da produção agrícola regional. Processos de sedimentação no canal têm exigido dragagem contínua em alguns pontos do rio para a manutenção da hidrovia. Para a localização destes pontos são necessários levantamentos batimétricos sistemáticos, realizados com ecobatímetros instalados em embarcações. Neste trabalho é analisada a viabilidade de aplicação do sensor orbital ASTER como instrumento para a extração de informações batimétricas do rio Paraguai. Para tal, foram aplicadas técnicas de processamento digital de imagens e de análise geoestatística. Dados coletados no campo foram utilizados para correlações estatísticas e determinação do desvio padrão dos dados. Profundidades extraídas do comprimento de onda do vermelho (banda 2; 0,63 – 0,69μm) foram as que apresentaram maior correlação com os dados obtidos diretamente no campo, especialmente para profundidades inferiores a 1,7 m. O método geoestatístico diminuiu a dispersão do modelo de 43 cm para 36 cm, mitigando a influência de elementos indesejados, tais como vegetação macrófita aquática e sedimentos em suspensão. A morfologia do canal pode também ser reconstituída satisfatoriamente com os valores digitais de da faixa do vermelho, convertidos em informações batimétricas. Os resultados alcançados permitiram concluir que dados orbitais do sensor ASTER podem fornecer informações batimétricas confiáveis, sendo portanto muito úteis para o monitoramento da migração das barras fluviais e das variações batimétricas menores que 1,7 m ao longo do canal do rio Paraguai. Palavras chave: ASTER, rio Paraguai, batimetria, sensoriamento remoto aplicado.

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    Authors: Leite, Igor Vieira; Almeida, André Quintão de; Loureiro, Diego Campana; Souza, Rodolfo Marcondes Silva; +3 Authors

    The depth of natural water reservoirs is usually estimated through bathymetry spot data. Once bathymetric data are collected, data values are spatially distributed using interpolation methods. This study aimed to evaluate the performance of three different types of interpolators across a range of bathymetric data collected at the Poxim river dam, in the state of Sergipe. In September 2016, 882 bathymetric measurements were performed in the water reservoir. The bathymetric data were spatialized using three methods: inverse distance square interpolation, spline and kriging. The resulting estimates were evaluated and the best method was chosen based on cross-validation statistics (RMSE). The Poxim river dam presents an average depth of approximately 8.6 m, with maximum and minimum values of 19.3 and 0.5 m, respectively. Kriging was pointed out as the best interpolation model, along with the spherical semivariogram adjustment, with RMSE values of 1.64 m in cross-validation, followed by the inverse distance square (RMSE = 1,69 m) and spline (RMSE = 1,72 m). Therefore, kriging is the recommended model for the spatialization of bathymetric data in the evaluated water reservoir. Generalmente, la profundidad de los reservorios se estima mediante datos puntuales de batimetría. Después de recopilar datos batimétricos, sus valores se espacializan mediante métodos de interpolación. El objetivo de este trabajo fue evaluar el desempeño de tres tipos diferentes de interpoladores en datos batimétricos recolectados en la presa del río Poxim-Açu, SE. En septiembre de 2016, se recolectaron 882 puntos batimétricos en el embalse. Los datos de batimetría se espacializaron mediante los métodos de interpolación de la inversa del cuadrado de la distancia, spline y kriging. Se evaluaron sus estimaciones y se eligió el mejor modelo con base en las estadísticas de validación cruzada (RMSE). La presa del río Poxim tiene una profundidad promedio de aproximadamente 8,6 my valores máximos y mínimos de 19,3 y 0,5 m, respectivamente. El mejor modelo de interpolación fue el de kriging, con el ajuste del semivariograma esférico, con valores de RMSE de 1,64 m en la validación cruzada, seguido de la inversa del cuadrado de distancia (RMSE = 1,69 m) y el spline (RMSE = 1,72 m). Por tanto, se recomienda el uso de kriging para espacializar los valores de batimetría del yacimiento analizado. Normalmente, a profundidade dos reservatórios é estimada por dados pontuais de batimetria. Após a coleta dos dados batimétricos, seus valores são espacializados por métodos de interpolação. O objetivo deste trabalho foi avaliar o desempenho de três diferentes tipos de interpoladores em dados de batimetria coletados na barragem do rio Poxim-Açu, SE. Em setembro de 2016, 882 pontos batimétricos foram coletados no reservatório. Os dados de batimetria foram espacializados pelos métodos de interpolação do inverso do quadrado da distância, spline e da krigagem. Suas estimativas foram avaliadas e o melhor modelo escolhido com base nas estatísticas (RMSE) da validação cruzada. A barragem do rio Poxim apresenta uma profundidade média de aproximadamente 8,6 m e valores máximo e mínimo de 19,3 e 0,5 m, respectivamente. O melhor modelo de interpolação foi o da krigagem, com o ajuste do semivariograma esférico, com valores de RMSE de 1,64 m na validação cruzada, seguido pelo inverso do quadrado da distância (RMSE = 1,69 m) e o spline (RMSE = 1,72 m). Recomenda-se, portanto, a utilização da krigagem para espacialização dos valores de batimetria do reservatório analisado.

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    Authors: Lima, Raoni da Costa;

    The Seixas reef has become, in recent years, one of the most important tourist attractions in João Pessoa, due to the commercial exploitation of tourism. However, there is no initiative in the Seixas reef and there wasn’t registered any action with aim to regulate the commercial activity in the area, until the year of this work, since it is just like other ones in place, like fishing and materials extraction, related to environmental impacts. The Seixas reef has a fundamental ecological importance, because it supports benthic species and a whole network of interactions related to them, in addition, reef preservation is fundamental to mitigate erosive processes on adjacent beaches. In this sense, aiming to promote a deepening knowledge of the area and encourage activities that can preserve it, a bathymetric mapping of the reef body was developed which revealed a rather complex shape with decreasing average altimetry from east to west. In addition to bathymetry were developed spatial maps of the dominant macroalgae in coverage, based on georeferenced quadrants which evidenced trends in the distribution of species related to landscape elements, such as bathymetry itself. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES O recife do Seixas tornou- se, nos últimos anos, um dos pontos turísticos mais importantes da cidade de João Pessoa, graças a exploração comercial do turismo, não há, no entanto no recife do Seixas nenhuma iniciativa ate o ano de realização deste trabalho não foram registradas atividade no sentido de regulamentar esta atividade na área, já que ela assim como outras desenvolvidas no local, como a pesca e extração de materiais, estão relacionadas a impactos ambientais. O recife do Seixas possui uma importância ecológica fundamental, pois oferece suporte a espécies bentônicas e toda uma rede de interações a elas relacionadas, além disso, a preservação do recife é fundamental para mitigar os processos erosivos nas praias adjacentes. Neste sentido, visando promover um aprofundamento do conhecimento da área e fomentar atividades que possam preserva-lo foi desenvolvido um mapeamento batimetrico do corpo recifal que revelou uma forma bastante complexa com altimetrias médias decrescentes de leste para oeste. Além da batimetria foram desenvolvidos mapas da espacialização das macroalgas dominantes na cobertura, com base em quadrats georreferenciados que evidenciaram tendências na distribuição das espécies relacionadas a elementos da paisagem, como a própria batimetria.

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    Authors: Minhoni, Renata Teixeira de Almeida;

    Dams are part of the history of civilizations, being among the first works architected by humanity. Reservoirs, formed by dams, act as sediment retention basins, promoting its gradual sedimentation. The accumulation of sediments on reservoir s bottom modifies the morphology of the relief, which should be periodically reviewed by the update of the elevation x area x volume curve (EAV), based on bathymetric surveys. This study aimed to evaluate the process of sedimentation on the Pipoca hydroelectric power plant reservoir, by performing bathymetric surveys and the characterization of the reservoir bottom sediments. Two bathymetric surveys were executed, the first, in 2012, with a single beam echosounder and the second, in 2013, with a multibeam echosounder. In addition to the comparison between the two methodologies used in the echosounders, it was analyzed the results obtained before and after the filling of the reservoir, by the generation of Digital Elevation Models (DEMs). The DEM before reservoir s filling was obtained from contour s lines of the region and some bathymetric sections of the river. These DEM enabled the generation of EAV curves before and after reservoir s filling, enabling the identification of deposited sediment volumes during the current operation period of the hydroelectric power plant. In the first bathymetric survey it was obtained a deposited sediment volume of 0.404 hm3, which represents an average annual sedimentation of 0.80%. In the second bathymetric survey was obtained a deposited sediment volume of 0.369 hm3, which represents an average annual sedimentation of 0.63%. The difference on the volumes obtained by the two equipments can be explained by the greater accuracy provided by the multibeam echo sounder. This multibeam echo sounder technology is able to provide 100% coverage of the area and requires less interpolation on the collected data than the other technology. As barragens fazem parte da história das civilizações, estando entre as primeiras obras arquitetadas pela humanidade. Os reservatórios, formados pela construção de barragens, atuam como verdadeiras bacias de retenção de sedimentos, promovendo o seu assoreamento gradual. O acúmulo de sedimentos do fundo do reservatório modifica a morfologia do relevo, que deve ser reavaliada periodicamente a partir da atualização das curvas cota x área x volume (CAV), com base em levantamentos batimétricos. O presente estudo visou avaliar o processo de assoreamento no reservatório da PCH Pipoca (MG), por meio da realização de levantamentos batimétricos e pela caracterização dos sedimentos de fundo do reservatório. Foram realizados dois levantamentos batimétricos, o primeiro, em 2012, com ecobatímetro monofeixe e o segundo, em 2013, com ecobatímetro multifeixe. Além da comparação entre as metodologias utilizadas no uso dos ecobatímetros, foram analisados os resultados obtidos antes e depois do enchimento do reservatório, a partir da geração de Modelos Digitais de Elevação (MDEs). O MDE antes do enchimento do reservatório, em 2006, foi obtido a partir de curvas de nível da região e de algumas seções batimétricas. Estes MDEs permitiram a geração das curvas CAV anterior e posterior ao enchimento do reservatório, possibilitando identificar volumes de sedimento depositado ao longo do período de operação do empreendimento. Na primeira batimetria do reservatório foi obtido um volume de sedimento depositado de 0,404 hm3, representando uma taxa média de assoreamento anual de 0,80%. Já na segunda batimetria do reservatório foi obtido um volume de sedimento depositado de 0,369 hm3, representando uma taxa média de assoreamento anual de 0,63%. Esta diferença pode ser justificada pelo fato de o ecobatímetro multifeixe proporcionar uma precisão maior no levantamento, ao ser capaz de mapear 100% da área, demandando pouca interpolação dos dados coletados.

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    Apresentação no âmbito do "Programa de Aulas Abertas à Cidade" da U.Porto

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    Authors: Baraldo, Kleber Barrionuevo;

    Pós-graduação em Biodiversidade Aquática - São Vicente Estuários são ambientes heterogêneos, altamente complexos, e condicionados por diversos fatores ambientais. Nenhum estuário é igual a outro, e é esta diversidade que os torna tão importantes do ponto de vista da conservação. A grande quantidade de recursos naturais disponíveis nesses ambientes favorece o desenvolvimento de assentamentos urbanos nas suas margens, podendo comprometer o equilíbrio natural. A partir do conhecimento detalhado dos sistemas estuarinos é possível traçar metas assertivas para a conservação e gestão destes ambientes tão singulares. O presente estudo visa a caracterização e comparação dos estuários dos rios Itaguaré e Guaratuba (Bertioga, SP) quanto aos seus parâmetros geo-físico-químicos. A área de estudo está localizada na planície costeira da Bacia Hidrográfica da Baixada Santista e inserida no Parque Estadual Restinga de Bertioga. Foram realizados levantamentos semestrais de batimetria e imageamento com sonar de varredura lateral, com o intuito de conhecer as profundidades e feições de fundo dos estuários, avaliando a dinâmica de processos erosivos e deposicionais. Medições mensais de salinidade, temperatura e turbidez foram realizadas ao longo de um ano, visando avaliar o comportamento sazonal da intrusão salina e da zona de máxima turbidez. Para verificar variações na granulometria, foram coletadas amostras de sedimentos nos mesmos pontos de medição das variáveis físico-químicas da água. Os resultados foram avaliados de forma integrada, utilizando técnicas de geoprocessamento e análise espacial, em conjunto com dados secundários de maregrafia e precipitação, analisando-se a influência de fatores meteoceanográficos na coluna d’água e na configuração do fundo ao longo desses ambientes. A comparação das batimetrias demonstrou que as regiões mais próximas da cabeceira de ambos estuários são influenciadas pela dinâmica fluvial, havendo erosão do fundo durante o inverno. Próximo à foz, o Itaguaré apresenta uma elevada dinâmica nos bancos de areia associada à ressacas. As feições de fundo apresentaram relação com a granulometria, e foi possível determinar regiões com sedimentos arenosos e areno-lamosos ao longo de ambos os estuários. A análise conjunta de dados de turbidez, granulometria e imageamento de fundo permitiram identificar a zona de máxima turbidez a cerca de 3,5 km da foz em ambos estuários. O estuário do rio Itaguaré é mais influenciado por eventos de ressaca, e o estuário do rio Guaratuba pela variação sazonal de precipitação na sub-bacia. O estuário do rio Itaguaré foi classificado como parcialmente misturado, ou de cunha salina (dependendo das condições), enquanto que o estuário do rio Guaratuba variou entre parcialmente misturado e bem misturado segundo a classificação de Pritchard (1955). Os dados de geomorfologia, batimetria e zonação dos estuários poderão subsidiar o gerenciamento e o uso sustentável destes locais, assim como avaliar o impacto de modificações nos parâmetros geo-físico-químicos ocasionadas por ações antrópicas em ambientes estuarinos. Estuaries are highly complex heterogeneous environments, conditioned by different environmental factors. Every estuary has particular characteristics, and this diversity makes them so important for conservation. The great amount of available natural resources in these environments contributes to urban settlement developments on their surroundings, which may compromise their natural balance. Detailed knowledge of estuarine systems helps establish assertive goals for the conservation and management of these unique environments. This study aims to characterize and compare Itaguaré and Guaratuba estuaries (Bertioga, SP) regarding their geophysical-chemical characteristics. The study area is located on the Baixada Santista Basin’s coastal plain, and inserted in the Restinga of Bertioga State Park. Biannual bathymetry and side scan sonar surveys were carried in order to evaluate erosive and depositional processes affecting depths and bottom features of the estuaries. Salinity, temperature and turbidity measurements were carried out monthly over a period of one year to evaluate seasonal behavior of saline intrusion and the estuarine turbidity maximum. Sediment samples were collected in order to verify granulometry variations. Results were evaluated in an integrated manner, using geoprocessing and spatial analysis techniques, coupled with secondary data of mareography and precipitation, analyzing the influence of meteoceanographic factors in the water column and the background configuration along these environments. Bathymetry analysis showed that regions close to estuaries heads (in both cases) are influenced by river dynamics, demonstrating bed erosion during winter. Near the mouth, the Itaguaré presents high dynamics of sand banks associated with storm surges caused by the strong oceanic winds. Bottom features were associated to granulometry, and it was possible to determine regions with sand and mud-sand sediments along both estuaries. The combined analysis of turbidity, granulometry and side scan imagery showed the estuarine turbidity maximum at about 3.5 km from the mouth of both estuaries. The Itaguaré River estuary is mainly influenced by storm surge events than the Guaratuba River estuary, which is more influenced by seasonal variation of precipitation in the watershed. Itaguaré estuary was classified as partially mixed, or salt wedge estuary (depending on the conditions), while Guaratuba ranged between partially mixed and well mixed estuary, according to Pritchard (1955) classification. The knowledge about geomorphological, bathymetric and estuarine zonation characteristics, contributes to sustainable management and use of these environments, and will help to estimate the impact of anthropogenic changes in geophysical-chemical parameters in estuaries.

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    Authors: Gagg, Gilberto;

    Dados de gravimetria e de altimetria por satélite foram usados como subsídio à análise morfoestrutural na região da Bacia de Pelotas-RS. Na abordagem gravimétrica foi usado o modelo geopotencial EGM2008 através das anomalias Bouguer e na abordagem batimétrica foi usado o modelo global DTU10BAT. Através dos mapas de anomalias Bouguer e perfis gravimétricos gerados, verificou-se que as anomalias Bouguer aumentam positivamente da costa em direção às maiores profundidades oceânicas, o que caracteriza um progressivo afinamento crustal associado à deriva continental. O comportamento das anomalias Bouguer obtidas por dados satelitais evidenciaram a presença de uma ruptura conhecida como Charneira Albo-aptiana na plataforma continental. A incidência de valores de anomalias significativamente positivas na região do Baixo de Mostardas sugere a presença de uma massa de maior densidade nesta região. A resolução dos dados gravimétricos utilizados não permitiu evidenciar a presença de paleocanais na região, sendo necessária uma maior resolução espacial, associada a outros métodos de investigação. O uso de dados de altimetria por satélite (modelo DTU10BAT) permitiu a análise batimétrica da plataforma continental e a investigação da configuração morfológica da região, que foi dividida em três faixas: Torres- Farol Solidão, Farol Solidão-Farol da Conceição e Farol da Conceição-Farol Sarita. Foi gerado um modelo teórico e comparado com o modelo DTU10BAT na geração do mapa de anomalias batimétricas. Os eixos de anomalias batimétricas negativas identificados estão frequentemente associados à direção de paleodrenagens, assim como as anomalias positivas tem relação com linhas de paleoestabilizações do nível do mar ou altos estruturais. Foi definida uma sequência de descontinuidades na altura do Farol da Conceição que apresentou expressiva coincidência com paleocanais delineados na mesma região através de outros estudos. Todos os dados foram processados e integrados em um sistema de informações geográficas. Os dados gravimétricos e batimétricos oriundos de missões satelitais são uma grande ferramenta nos estudos regionais para áreas que envolvam aplicações geológicas e mesmo oceanográficas. Data from satellite altimetry and gravity were used to the morphostructural analysis in the Pelotas Basin-RS region. The EGM2008 geopotential model through the Bouguer anomalies was used in the gravimetric approach and the DTU10BAT global model was used in the bathymetric approach. Through the Bouguer anomalies maps and the gravimetric profiles that were generated, it was observed that Bouguer anomalies increase positively from coast towards to the major ocean depths, what characterizes a progressive crustal thinning associated with the continental drift. The behavior of the Bouguer anomalies obtained from satellite data showed the presence of a rupture, known as Charneira Albo-Aptiana, on the continental shelf. The incidence of significant positive anomalies values on the Baixo de Mostardas region suggests the presence of a higher-density mass in this region. Because of the resolution of the gravimetric data used in this research was not enough, it was not possible to show the presence of paleochannels in the region, requiring a greater spatial resolution data, associated with other methods of investigation. The use of satellite altimetric data (model DTU10BAT) allowed the bathymetric analysis of the continental shelf and the research of morphological configuration of the region, which was divided into three areas: Torres- Solidão Lighthouse, Solidão Lighthouse-Conceição Lighthouse and Conceição Lighthouse-Sarita Lighthouse. A theoretical model was generated and it was compared with the DTU10BAT model in the generation of the bathymetric anomalies map. The axes of negative bathymetric anomalies identified are often associated with the direction of paleochannels, as well as the positive anomalies are related to lines of sea level paleostabilizations or structural highs. It was defined a sequence of discontinuities at the Conceição Lighthouse proximities which presented a significant coincidence with paleochannels that were delineated in the same region through other studies. The data were processed and integrated in a geographic information system. Gravimetric and bathymetric data from satellite missions are an important tool in regional studies for areas that involve geological and oceanographic applications.

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    Authors: Faria, Sandro Henrique de; Rodrigues, Dalto Domingos; Medeiros, Nilcilene das Graças; Aranha, Paulo Roberto Antunes;

    Este trabalho tem como objetivos avaliar o desempenho do GPR (Ground Penetrating RADAR) para aplicações batimétricas em ambiente controlado e do aplicativo “GPR Bathymetry”, desenvolvido para análise de radargramas batimétricos. O estudo foi realizado em uma caixa de decantação da estação de tratamento de água da qual se tem o “as-built”, obtido com estação total, que será empregado nos testes de validação. Realizaram-se três testes de comparação: comparações pontuais; entre Modelos Digitais de Elevação (MDE) gerados a partir do interpolador Topo to Raster; e entre os volumes calculados a partir dos MDE’s. Na comparação pontual a maior amplitude de discrepância entre as médias foi de 8cm. Para a amostra de discrepâncias entre os MDE’s, a amplitude foi de 9cm, média de 2cm, acurácia estimada de 4cm e o RMS de 3cm. Na comparação volumétrica obteve-se o valor de 800,6m³ com dados de referência e 806,4m³ com dados do GPR, resultando numa diferença de 1% entre os modelos. Conclui-se que para um reservatório construído em concreto armado, profundidades variando de 3 a 3,5 metros, o levantamento do relevo submerso empregando um GPR apresentou resultados promissores e um MDE com acurácia estimada de 4cm e discrepâncias de até 9cm This paper aims to evaluate the performance of the GPR (Ground Penetrating Radar) for bathymetric applications in a controlled environment, as well as evaluate the “GPR Bathymetry” software designed to bathymetric radargrams analysis. The study was realized in a decanting water treatment plant (WTP), where has the as-built obtained with total station, it will be used in validation tests. Was realized three comparison tests: from points comparisons; from Digital Elevation Models (DEM) generated from interpolating Top to Raster; and between volumes calculated from DEMs. In the point comparison, the greatest difference between averages was 8 cm. For the discrepancies sample between DEMs, the amplitude was 9 cm, average of 2 cm, estimate accuracy of 4 cm and RMS equal to 3 cm. In the volumetric comparison, we obtained the amount of 800.6 m³ with reference data and 806.4 m³ with the GPR data, resulting in a 1% difference between models. We conclude that for a reservoir built in reinforced concrete, depths ranging from 3 to 3.5 meters, the survey of the bottom relief employing a GPR showed promising results and a DEM with an estimate accuracy of 4 cm and discrepancies that may reach 9 cm

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    Authors: Ferreira, Italo Oliveira;

    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Over 80% of international trade is transported by waterways and Brazil is no different. Only this statement might already be sufficient to justify any study on the area of marine geodesy. However, especially in Brazil knowledge about the reliefs submerged is still scarce. Such knowledge is acquired through bathymetric surveys, focus of this work. The methodology exposed covers all stages of realization of a singlebeam bathymetric survey, fully automated: data collection by applying a dual frequency echo sounder and technical RTK (Real Time Kinematic), processing, data analysis and generation Model Digital Depth (MDP) of an impoundment of Ribeirão São Bartolomeu located on the campus of UFV. At work methods are used for topography and bathymetry data acquisition on the relief of the site and the depth of the impoundment. These were processed and analyzed for the subsequent generation of MDP using deterministic and probabilistic interpolators. Regarding the three-dimensional modeling of the relief submerged studies have been performed to quantify the errors in the modeling through automatic kriging and compare the efficiency of kriging and inverse distance weighted in different sampling grids. It was found that the bathymetric surveys have ideal characteristics for the application of geostatistics. As main results verified that the Kriging systematically conducted by the analyst respecting all the conditions required by it, the bathymetry location represented more accurately compared to other methods studied. Through this work it was also possible to obtain an estimate of the volume of water and sludge reservoir fluidly deposited on the submerged bottom. Mais de 80% do comércio internacional é transportado por vias aquáticas e no Brasil não é diferente. Somente esta afirmação já poderia ser suficiente para justificar qualquer estudo relativo à área de Geodésia Marinha. Contudo, principalmente no Brasil, o conhecimento a cerca dos relevos submersos ainda é escasso. Tal conhecimento é adquirido através de levantamentos batimétricos, foco deste trabalho. A metodologia exposta abrange todas as etapas de realização de um levantamento batimétrico monofeixe, totalmente automatizado: coleta dos dados aplicando um ecobatímetro de duas frequências e técnica RTK (Real Time Kinematic), o processamento, a análise dos dados e a geração do Modelo Digital de Profundidade (MDP) de um represamento do Ribeirão São Bartolomeu localizado no campus da UFV. No trabalho são utilizados métodos de topografia e batimetria para a aquisição de dados sobre o relevo do local e da profundidade do represamento. Estes foram processados e analisados para a posterior geração do MDP utilizando interpoladores determinísticos e probabilísticos. No que concerne à modelagem tridimensional do relevo submerso foram realizados estudos visando quantificar os erros cometidos na modelagem através da krigagem automática e comparar a eficiência da krigagem e do inverso ponderado da distância em diferentes GRIDs amostrais. Foi possível constatar que os levantamentos batimétricos apresentam características ideais para a aplicação da Geoestatística. Como resultados principais verificou-se que a Krigagem sistemática, realizada pelo analista respeitando-se todos os pressupostos exigidos pela mesma, representou a batimetria local de forma mais acurada comparativamente aos outros métodos estudados. Através deste trabalho também foi possível obter uma estimativa do volume de água do reservatório e de lama fluídica depositada no fundo submerso.

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    Authors: Krug, Lilian Anne; Noernberg, Mauricio Almeida;

    Baixios representam riscos a navegação no interior dos estuários. Portanto, devem ser bem delineados e tais informações devem ser freqüentemente atualizadas. Métodos hidrográficos tradicionais têm dificuldade em cobrir áreas rasas devido sua extensão e relevo. Uma alternativa é o uso de imagens de satélites para mapear essas áreas, com as vantagens de baixo custo e rápido resultado. No setor norte do Complexo Estuarino de Paranaguá o último levantamento batimétrico foi realizado na década de 50 e um novo mapeamento destas áreas, mesmo sem a acurácia das cartas náuticas, é de utilidade para o planejamento de estudos, modelagem ambiental e navegação de pequenas embarcações. Este estudo teve o objetivo de avaliar o potencial de gerar mapa batimétrico das áreas rasas da Baía das Laranjeiras, através do sensoriamento remoto. A aplicação deste método é fácil e mostrou-se bastante útil em regiões onde não existem dados batimétricos ou estes precisam ser atualizados. O mapa obtido é bastante fiel dentro dos limites batimétricos que se pretende, entre 0,36 e 4,5 m de profundidade, principalmente considerando que 75% do complexo estuarino possui profundidade inferior a 5 m. Shallow waters represent potential risks to navigation inside estuaries. Therefore, they must be well described and data must be always updated. Traditional hydrographic methods have difficult to cover shallow areas due to them extension and low relief. An alternative is the use of satellite images for mapping the areas, with the advantage of low cost and quick results. In the north area of the Paranaguá Estuarine Complex the last bathymetric survey was in the 50's so a new bathymetric mapping of these areas, even without the nautical chart's accuracy, is useful for studies planning, environmental modeling and small boats navigation. This study had the objective of generate bathymetric map of shallow areas in the Laranjeiras bay through remote sensing. The application of this method is not difficult and could be very useful in regions were there is no bathymetric data or need to be updated. The map obtained is very realistic inside the limits of 0,36 to 4,5 m water depth and important considering that nearly 75% of the Paranaguá Estuarine Complex have depths less than 5 m.

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    Authors: Zani, Hiran; Assine, Mario Luis; Silva, Aguinaldo;

    The Paraguay River is the main tributary of the Paraná River and has an extension of 1.693 km in Brazilian territory. The navigability conditions are very important for the regional economy because most of the central-west Brazilian agricultural and mineral production is transported by the Paraguay waterway. Increased sedimentation along the channel requires continuous dredging to waterway maintenance. Systematic bathymetric surveys are periodically carried out in order to check depth condition along the channel using echo-sounding devices. In this paper, digital image processing and geostatistical analysis methods were used to analyze the applicability of the ASTER sensor to estimate channel depths in a segment of the upper Paraguay River. The results were compared with field data in order to choose the band with better adjustment and to evaluate the standard deviation. Comparing the VNIR bands, the best fit was presented by the red wavelength (band 2; 0,63 - 0,69 μm), showing a good representation of the channel depths shallow than 1,7 m. Applying geostatistical methods, the model accuracy was enhanced from 43 cm to 36 cm and undesired components were slacked. It was concluded that the digital number of band 2, converted to bathymetry information allows a good estimation of river depths and channel morphology. O rio Paraguai é o principal tributário do rio Paraná, percorrendo uma extensão de 1.693 km em território brasileiro. O rio é de grande importância para a economia da Região Centro-Oeste, sendo uma das principais vias de escoamento da produção agrícola regional. Processos de sedimentação no canal têm exigido dragagem contínua em alguns pontos do rio para a manutenção da hidrovia. Para a localização destes pontos são necessários levantamentos batimétricos sistemáticos, realizados com ecobatímetros instalados em embarcações. Neste trabalho é analisada a viabilidade de aplicação do sensor orbital ASTER como instrumento para a extração de informações batimétricas do rio Paraguai. Para tal, foram aplicadas técnicas de processamento digital de imagens e de análise geoestatística. Dados coletados no campo foram utilizados para correlações estatísticas e determinação do desvio padrão dos dados. Profundidades extraídas do comprimento de onda do vermelho (banda 2; 0,63 – 0,69μm) foram as que apresentaram maior correlação com os dados obtidos diretamente no campo, especialmente para profundidades inferiores a 1,7 m. O método geoestatístico diminuiu a dispersão do modelo de 43 cm para 36 cm, mitigando a influência de elementos indesejados, tais como vegetação macrófita aquática e sedimentos em suspensão. A morfologia do canal pode também ser reconstituída satisfatoriamente com os valores digitais de da faixa do vermelho, convertidos em informações batimétricas. Os resultados alcançados permitiram concluir que dados orbitais do sensor ASTER podem fornecer informações batimétricas confiáveis, sendo portanto muito úteis para o monitoramento da migração das barras fluviais e das variações batimétricas menores que 1,7 m ao longo do canal do rio Paraguai. Palavras chave: ASTER, rio Paraguai, batimetria, sensoriamento remoto aplicado.

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    Authors: Leite, Igor Vieira; Almeida, André Quintão de; Loureiro, Diego Campana; Souza, Rodolfo Marcondes Silva; +3 Authors

    The depth of natural water reservoirs is usually estimated through bathymetry spot data. Once bathymetric data are collected, data values are spatially distributed using interpolation methods. This study aimed to evaluate the performance of three different types of interpolators across a range of bathymetric data collected at the Poxim river dam, in the state of Sergipe. In September 2016, 882 bathymetric measurements were performed in the water reservoir. The bathymetric data were spatialized using three methods: inverse distance square interpolation, spline and kriging. The resulting estimates were evaluated and the best method was chosen based on cross-validation statistics (RMSE). The Poxim river dam presents an average depth of approximately 8.6 m, with maximum and minimum values of 19.3 and 0.5 m, respectively. Kriging was pointed out as the best interpolation model, along with the spherical semivariogram adjustment, with RMSE values of 1.64 m in cross-validation, followed by the inverse distance square (RMSE = 1,69 m) and spline (RMSE = 1,72 m). Therefore, kriging is the recommended model for the spatialization of bathymetric data in the evaluated water reservoir. Generalmente, la profundidad de los reservorios se estima mediante datos puntuales de batimetría. Después de recopilar datos batimétricos, sus valores se espacializan mediante métodos de interpolación. El objetivo de este trabajo fue evaluar el desempeño de tres tipos diferentes de interpoladores en datos batimétricos recolectados en la presa del río Poxim-Açu, SE. En septiembre de 2016, se recolectaron 882 puntos batimétricos en el embalse. Los datos de batimetría se espacializaron mediante los métodos de interpolación de la inversa del cuadrado de la distancia, spline y kriging. Se evaluaron sus estimaciones y se eligió el mejor modelo con base en las estadísticas de validación cruzada (RMSE). La presa del río Poxim tiene una profundidad promedio de aproximadamente 8,6 my valores máximos y mínimos de 19,3 y 0,5 m, respectivamente. El mejor modelo de interpolación fue el de kriging, con el ajuste del semivariograma esférico, con valores de RMSE de 1,64 m en la validación cruzada, seguido de la inversa del cuadrado de distancia (RMSE = 1,69 m) y el spline (RMSE = 1,72 m). Por tanto, se recomienda el uso de kriging para espacializar los valores de batimetría del yacimiento analizado. Normalmente, a profundidade dos reservatórios é estimada por dados pontuais de batimetria. Após a coleta dos dados batimétricos, seus valores são espacializados por métodos de interpolação. O objetivo deste trabalho foi avaliar o desempenho de três diferentes tipos de interpoladores em dados de batimetria coletados na barragem do rio Poxim-Açu, SE. Em setembro de 2016, 882 pontos batimétricos foram coletados no reservatório. Os dados de batimetria foram espacializados pelos métodos de interpolação do inverso do quadrado da distância, spline e da krigagem. Suas estimativas foram avaliadas e o melhor modelo escolhido com base nas estatísticas (RMSE) da validação cruzada. A barragem do rio Poxim apresenta uma profundidade média de aproximadamente 8,6 m e valores máximo e mínimo de 19,3 e 0,5 m, respectivamente. O melhor modelo de interpolação foi o da krigagem, com o ajuste do semivariograma esférico, com valores de RMSE de 1,64 m na validação cruzada, seguido pelo inverso do quadrado da distância (RMSE = 1,69 m) e o spline (RMSE = 1,72 m). Recomenda-se, portanto, a utilização da krigagem para espacialização dos valores de batimetria do reservatório analisado.

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