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  • Authors: Ahmet Cevdet Yalciner; Ugur Kuran; Adnan Akyarli; Fumihiko Imamura;

    Based on the seismic characteristics of the Aegean Sea and the surrounding regions, the earthquakes during the last century have been investigated and the related fault breaks and some tsunamis in the region are analyzed. The computer model TSUNAMI-N1, at the Tohoku University, is modified to satisfy for the boundary conditions and bathymetry of the Aegean Sea and a version TSUNAMI-N1EGE, is developed. This model is applied to investigate the generation and propagation of the “1956 Southern Aegean Tsunami” and an expected hypothetical “Andicithira Tsunami”.

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    https://doi.org/10.1007/978-94...
    Part of book or chapter of book . 1995 . Peer-reviewed
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      https://doi.org/10.1007/978-94...
      Part of book or chapter of book . 1995 . Peer-reviewed
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  • Authors: Dursun Zafer Seker; Sedat Kabdasli; A. I. Ulusoy; Ahmet Cevdet Yalciner;

    In this study to produce innovation maps of study area, different types of data such as elevation and bathymetry of study area and Geographic Information Systems (GIS) have been used to determine risks areas on the coastline under the threat of tsunam

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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Oktay Dumankaya;
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao The International Jo...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    The International Journal of Nautical Archaeology
    Article . 2018 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao The International Jo...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      The International Journal of Nautical Archaeology
      Article . 2018 . Peer-reviewed
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    Authors: Ardiç, Mehmet;

    Dünya üzerinde su temini konusu hayati bir öneme sahiptir. Bu sebeple ülkeler kendi su potansiyellerini muhafaza etme ve ergonomik kullanma amacına göre projeler geliştirmektedirler. Geliştirilen projelerin başında barajlar gelmektedir. Muhafaza görevi gören barajların zaman içerisinde rezervuarında kıyı erozyonu ve rezervuarı besleyen akarsuların taşımış olduğu malzemelerin çökelmesi ile sedimentler oluşur. Sedimentin oluşması ile rezervuar tabanı yükselir ve depolama kapasitesinde hacim kaybına neden olur. Bu kayıp barajların ekonomik ömürlerini azaltmakta, taşkın önleme, hidroelektrik enerji üretimi, sulama, içme suyu temini ve rekreasyon vb. işlevleri olumsuz etkilemektedir. Barajların ekonomik ömürlerinin azalması, yeni barajların inşa edilmesini akla getirmektedir. Ancak yeni barajların yapım süresi, maliyeti ve yapının yapılabileceği coğrafik alanların az olması nedeniyle bu tercihi etkin kılmamaktadır. Bu tez çalışmasında; rezervuarların ekonomik ömrünü azaltan sediment birikimi problemi ve barajların ekonomik ömürlerinin yeniden kazanabilmeleri için sedimentin kontrol edilmesi ile ilgili olarak ayrıntılı bilgi verilmiştir. Ayrıca, Osmaniye ili, Sumbas ilçesi sınırları içerisinde bulunan Kesiksuyu (Mehmetli) Barajının 1963 ve 2007 yıllarındaki verileri kullanılarak bir uygulama gerçekleştirilmiştir. Sediment birikimi Ortalama Sonlu Alan Yöntemi ile belirlenmiştir. 44 yılda %17.20 hacim kaybının gerçekleştiği tespit edilmiştir. Elde edilen zamansal değişim haritaları Coğrafi Bilgi Sistemi (CBS) ile görselleştirilmiştir. The debate on global water supply is a vital issue. Therefore, countries develop projects with the purpose of maintaining their own water potential and according to their ergonomic usage. Dams constitute the foremost among the developed projects. Sediments are formed in dry dams due to coastal erosion and deposition of materials carried by the streams that feed the reservoir. The base of the reservoir rises because of sediment formation and causes a loss of the volume in storage capacity. This loss can reduce the economical life of the dam and has a negative effect on flood prevention, hydroelectric power generation, irrigation, drinking water supply, recreation, etc. The reduction in the economical life of dams suggests construction of new dams. However, this option is not seen effective because of their construction time, costs and insufficient geographical areas to build them. This thesis provides detailed information on the problem of sediment accumulation which reduces the economical life of the reservoir and on sediment control and removal methods in order to regain economic life of the dams. In addition, an application has been performed on Kesiksuyu (Mehmetli) Dam located in Sumbas town of Osmaniye province using the data of 1963 and 2007. Average sediment accumulation was determined by the finite field method. It was determined that a loss of 17.20 % of the total volume has occurred during the period of 44 years. The obtained temporal change maps were visualized using Geographic Information System (GIS).

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    Authors: Sarmaşık, Seher Sonay;

    Çalışma kapsamında, Delft3-D modelinde kullanılacak hidrodinamik ve meteorolojik parametreler belirlenmiş, mevcut hidrodinamik veriler DSİ ve EİEİ'den temin edilirken, meteorolojik veriler DMİ'den alınmıştır. Gölü besleyen ve gölün boşalımını sağlayan akarsular ve gölde belirlenen örnekleme noktalarında farklı analizler yapılmıştır. Gölün mevcut batimetrik haritasının güncellenmesi amacıyla arazi ölçümlerine çıkılmış, DSİ tarafından 1995 yılında hazırlanan batimetri haritası ile güncel ölçümler kıyaslanarak gölün alan-hacim değerlerindeki değişim belirlenmiştir. Mayıs 2008 Mayıs 2009 tarihleri arasındaki örnekleme periyodu sonunda model çalışmaları dört dönemde incelenmiş, dönemler için hassasiyet analizi uygulanarak taban pürüzlülüğünün göldeki hidrodinamik koşullar üzerindeki etkisi incelenmiştir.Yapılan duyarlılık analizi sonucunda gölün taban pürüzlülüğünün vejetasyona göre göl suyunun derinliğinde bir değişime neden olmadığı, ancak akım hızı etkilediği gözlenmiştir. Çalışmada rüzgarın göl yüzeyinde oluşturduğu akıntılar ve gölde neden olduğu çevrimler görülmüştür. Bu durumun gölde tam karışım sağladığı ve sediment tabakasını süspanse hale getirerek göldeki bulanıklığa neden olduğu sonucuna varılmıştır. The hydrodynamic and the meteorological parameters going to be used in Delft3D model are determined, available meteorological data was provided by DSI and EİEİ whereas DMI delivered the meteorological data. Analysis was conducted in sampling points within the lake and streams feeding and discharging the lake. In order to update the existing bathymetry map, field study was conducted and the changing in the area and volume values of the lake was determined with the comparison of existing bathymetry map prepared by DSİ in 1995 and current measurements. At the end of the sampling period between May 2008 and May 2009 model studies were examined within four periods, the hydrodynamic conditions in the lake was investigated by applying the sensitivity analysis on the effect of roughness in these periods.As a result of the sensitivity analysis according to vegetation on the lake roughness change is not caused by changes in the depth of the lake water, but the flow rate was affected. In addition circulations and currents caused by the effect of the wind on the lake surface were observed. Further this situation, provide complete mixture for the lake and cause the turbidity in lake by resuspension of sediment layer.

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    Açık Erişim@BUU
    Master thesis . 2012
    License: CC BY
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      Açık Erişim@BUU
      Master thesis . 2012
      License: CC BY
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    Authors: Onur Gönülal; Cem Dalyan;

    Abstract The objective of this study was to compare the distribution patterns of macroinvertebrate species between the Northeastern Levantine Sea and the Northeastern Aegean Sea. A total of 157 hauls were carried out by commercial trawlers at depths ranging from 30 to 410 m in both areas. The result of SIMPER analysis shows clear differences between the two surveyed areas except for the 300-410 m depth range. Ninety five species were found in the Northeastern Aegean Sea and 100 species in the Northeastern Levantine Sea. Of these species, Pyrosoma atlanticum is newly reported for the Turkish coast. Forty three species were common to both areas.

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    Oceanological and Hydrobiological Studies
    Article . 2017 . Peer-reviewed
    License: CC BY NC ND
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    Oceanological and Hydrobiological Studies
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      Oceanological and Hydrobiological Studies
      Article . 2017 . Peer-reviewed
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      Oceanological and Hydrobiological Studies
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    Authors: Guido Gnone; Michela Bellingeri; Sabina Airoldi; Joan Gonzalvo; +40 Authors

    We investigated the presence and diversity of cetaceans in the Mediterranean Sea, analysing the data collected by 32 different research units, over a period of 15 years (2004–2018), and shared on the common web-GIS platform named Intercet. We used the encounter rate, the species prevalence, and the Shannon diversity index as parameters for data analysis. The results show that cetacean diversity, in the context of the Mediterranean basin, is generally quite low when compared with the eastern Atlantic, as few species, namely the striped dolphin, the bottlenose dolphin, the fin whale, and the sperm whale, dominate over all the others. However, some areas, such as the Alboran Sea or the north-western Mediterranean Sea, which includes the Pelagos Sanctuary (the Specially Protected Area of Mediterranean Interest located in the northern portion of the western basin), show higher levels of diversity and should be considered hotspots to be preserved. Primary production and seabed profile seem to be the two main drivers influencing the presence and distribution of cetaceans, with the highest levels of diversity observed in areas characterized by high levels of primary production and high bathymetric variability and gradient. This collective work underlines the importance of data sharing to deepen our knowledge on marine fauna at the scale of the whole Mediterranean Sea and encourages greater efforts in the networking process, also to accomplish the requirements of the Marine Strategy Framework Directive, with particular reference to Descriptor 1: biological diversity is maintained.

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  • Authors: Rozita Kian; Aykut Pamuk; Ahmet Cevdet Yalciner; Andrey Zaytsev;

    Tsunami induced flows expose the morphological changes at the coastal zone. The morphological changes due to tsunami motion could be categorized to sediment transportation and hence erosion, deposition, scouring. The recent devastating tsunamis in 2004 and 2011 have not only caused extensive damage on marine structures but also cause morphological changes especially in the sand coastal plains, river mouths and their surroundings. The sediment transports by storm wave have been studied extensively but the problem of tsunami and morphology still need further investigations. However, it is remained a developing field of study yet since the validation methods for real cases are complicated. In order to achieve a better validation, the data for both topography and bathymetry are necessary before and after the hazard. The distribution of morphological changes due to tsunamis can be governed by topography, tsunami current and the characteristics of ground material. Rouse number is one of the indicator to describe the initiation of sediment motion. Therefore the transport modes of the sediment can be observed by following the change of the Rouse number. In this paper the spatial and temporal change of Rouse number in the study domain during a tsunami is investigated. As the case study the tsunami inundation and morphological changes near Antalya region in Mediterranean Sea at south of Turkey due to a critical tsunami scenario is studied. The spatial and temporal changes of Rouse number is computed by the tsunami simulation and the possible movement of the ground materials are determined and discussed.

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  • Authors: Costas E. Synolakis; Ahmet Cevdet Yalciner; Jose C. Borrero; George Plafker;

    In the evening of November 3, 1994, a series of submarine landslides and associated waves destroyed the Pacific Arctic Railway Company (PARN) dock at Skagway, Alaska, killing one construction worker. Numerous geologic and hydrodynamic studies followed, in an effort to prove or disprove that construction failure was responsible for initiating the slide. We model the slide using two inundation models, the model known as TUNAMI--N2 (not TSUNAMI) developed at Tohoku University and the model VTCS--3 developed at the University of Southern California and now in use by NOAA and known as MOST. Both models when run under the same initial conditions and bathymetry provided consistent results about the hydrodynamic motions close to the PARN dock. The results qualitatively fit the eyewitness observations, using a combination of three slides, and suggest that the sliding started offshore along the fjord wall off the southern end of the dock and undermined the southern two thirds of the dock.

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    Authors: Basmacı, Ahmet Emre;

    Mikro batimetri verisinde karşılaşılan gürültülere ve ölçülen hatalı derinliklere uygulanan veri işlem teknikleri ile görüntü kalitesinin arttırılması yapılan çalışmanın temelini oluşturmaktdır. Hata miktarı çok olan ölçümler harita ortamında Bull’s eye etkisine neden olmaktadır.Geliştirilen yöntem; daha önceden eşit alanda bölünmüş harita parçaları üzerinden Bull’s eye etkisine sahip yerlerin, koordinatları belirli poligonlar içine alınmasına, tanımlanan alanlar içinde kalan verinin yeni oluşturulacak dosya içine yazılmaması esasına dayanmaktadır. Böylece bahsedilen nedenlerden kaynaklanan Bull’s eye etkilerinin haritadan yerleri belirlenmekte, silme işlemi ham veri üzerinden gerçekleştirilmektedir. Haritanın eşit parçalara bölünerek çalışılması hem haritalamada hem de Bull’s eye giderimindeki işlem zamanını kısaltmaktadır. Grid düğüm noktaları üzerinden çalışan eşik değer ortalama yöntemi ile birbirine komşu, boş olmayan grid düğüm noktaları belirlenmekte ve bütün grid boyunca, belirlenen filtre boyundaki alan içindeki ortalama derinlik değeri ile alan içindeki değerler önceden atanmış eşik değer ile ilişkilendirilmektedir. Böylece, ortalamadan çok büyük olan değerler yerine ortalama değerin atanması ani yalancı yükselimlerin oluşmasını engellemektedir. Gemi motorunun neden olduğu gürültü ışık yönlendirimli kabartma haritalarında küçük dalga boylu, geminin hareket doğrultusunda süreklilik arzeden istenmeyen yapılar oluşturmaktadır. Genlik spektrumunda ise gürültü, yüksek dalga sayılarında düşük genlikli salınımlar olarak gözlenmektedir. Geliştirilen high-cut filtreleme tekniği; Verinin genlik spektrumu ile aynı boyutta tasarlanmış bir kosinüs penceresi genlik spektrumuyla çarpılmakta ve iki boyutlu ters Fourier dönüşümü ile harita ortamına geçildiğinde gürültünün yok olduğu gözlenmektedir. İzmit Körfezi’nde Hersek Deltası’nın doğusunda, Kuzey Anadolu Fayı’nın Armutlu Yarımadası’nın kuzeyinde dip morfolojisinde yapmış olduğu etkiler görüntülenmiştir. İmralı Adası’nın kuzeyinde eskiden Çınarcık Çukuru’na dökülmekte olan bir nehir yatağının yukarı bölümünde doğrultu atım bileşeni yüksek bir fayın etkisi altında uğradığı deformasyon da tespit edilmiştir. Atım miktarından hareketle, Güney Sınır Fayı’nın yaşı 1150007500 yıl olarak tahmin edilmektedir. Visual quality of the bathymetry maps are enhanced by the help of data processing techniques, and this construct a fundamental basis for our project. Measurments of depths with higher variance cause sudden increment of the seafloor in the map domain that is called Bull’s eye effect. The way we remove the Bull’s eye effect is eliminating the incorrectly measured depths from the data set by bounding the regions on the map by poligons. After the map is mathematically devided into equal pieces, Bull’s eye effect removing process is executed . If it is seen that the Bull’s eye effects are removed in every piece, the map is reconstructed by equal pieces of areas. Dividing map into equal pieces saves time for computation and high amount of data can be mapped whatever the size of the data. Thereshold averaging is an alternative way of filtering the unconformities on the sea bottom. Along the whole grid the method is applied. The average value of predefined subarea is compared with each grid points. Thus the depth values which are greater than the mean value are recursively changed with the mean value along the whole grid. The noise caused by engine of the vessel is removed by high-cut filtering method. In the amplitude spectrum, noise corresponds to short amplitude oscillations in higher wave numbers. After the window is designed, the amplitude spectrum is multiplied with the cosine window in frequency domain. The part which shows an oscillation pattern in amplitude spectrum is multiplied by the zeros of the taper. Optimal filtered map shows the noise free image of the seafloor. Deformation pattern observed along the North Anatolian Fault in the Southern Marmara Sea is mapped. Upstream part of an old river in the northern part of the İmralı Island gives an idea about the age of the South Boundary Fault about 1150007500 years. Deformation caused by the right lateral movement of the South Boundary Fault in the upstream part of the river is consistent with the seismic sections in the literature. Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003 Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2003 Yüksek Lisans M.Sc.

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  • Authors: Ahmet Cevdet Yalciner; Ugur Kuran; Adnan Akyarli; Fumihiko Imamura;

    Based on the seismic characteristics of the Aegean Sea and the surrounding regions, the earthquakes during the last century have been investigated and the related fault breaks and some tsunamis in the region are analyzed. The computer model TSUNAMI-N1, at the Tohoku University, is modified to satisfy for the boundary conditions and bathymetry of the Aegean Sea and a version TSUNAMI-N1EGE, is developed. This model is applied to investigate the generation and propagation of the “1956 Southern Aegean Tsunami” and an expected hypothetical “Andicithira Tsunami”.

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    https://doi.org/10.1007/978-94...
    Part of book or chapter of book . 1995 . Peer-reviewed
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      Part of book or chapter of book . 1995 . Peer-reviewed
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  • Authors: Dursun Zafer Seker; Sedat Kabdasli; A. I. Ulusoy; Ahmet Cevdet Yalciner;

    In this study to produce innovation maps of study area, different types of data such as elevation and bathymetry of study area and Geographic Information Systems (GIS) have been used to determine risks areas on the coastline under the threat of tsunam

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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Oktay Dumankaya;
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    The International Journal of Nautical Archaeology
    Article . 2018 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao The International Jo...arrow_drop_down
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      The International Journal of Nautical Archaeology
      Article . 2018 . Peer-reviewed
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    Authors: Ardiç, Mehmet;

    Dünya üzerinde su temini konusu hayati bir öneme sahiptir. Bu sebeple ülkeler kendi su potansiyellerini muhafaza etme ve ergonomik kullanma amacına göre projeler geliştirmektedirler. Geliştirilen projelerin başında barajlar gelmektedir. Muhafaza görevi gören barajların zaman içerisinde rezervuarında kıyı erozyonu ve rezervuarı besleyen akarsuların taşımış olduğu malzemelerin çökelmesi ile sedimentler oluşur. Sedimentin oluşması ile rezervuar tabanı yükselir ve depolama kapasitesinde hacim kaybına neden olur. Bu kayıp barajların ekonomik ömürlerini azaltmakta, taşkın önleme, hidroelektrik enerji üretimi, sulama, içme suyu temini ve rekreasyon vb. işlevleri olumsuz etkilemektedir. Barajların ekonomik ömürlerinin azalması, yeni barajların inşa edilmesini akla getirmektedir. Ancak yeni barajların yapım süresi, maliyeti ve yapının yapılabileceği coğrafik alanların az olması nedeniyle bu tercihi etkin kılmamaktadır. Bu tez çalışmasında; rezervuarların ekonomik ömrünü azaltan sediment birikimi problemi ve barajların ekonomik ömürlerinin yeniden kazanabilmeleri için sedimentin kontrol edilmesi ile ilgili olarak ayrıntılı bilgi verilmiştir. Ayrıca, Osmaniye ili, Sumbas ilçesi sınırları içerisinde bulunan Kesiksuyu (Mehmetli) Barajının 1963 ve 2007 yıllarındaki verileri kullanılarak bir uygulama gerçekleştirilmiştir. Sediment birikimi Ortalama Sonlu Alan Yöntemi ile belirlenmiştir. 44 yılda %17.20 hacim kaybının gerçekleştiği tespit edilmiştir. Elde edilen zamansal değişim haritaları Coğrafi Bilgi Sistemi (CBS) ile görselleştirilmiştir. The debate on global water supply is a vital issue. Therefore, countries develop projects with the purpose of maintaining their own water potential and according to their ergonomic usage. Dams constitute the foremost among the developed projects. Sediments are formed in dry dams due to coastal erosion and deposition of materials carried by the streams that feed the reservoir. The base of the reservoir rises because of sediment formation and causes a loss of the volume in storage capacity. This loss can reduce the economical life of the dam and has a negative effect on flood prevention, hydroelectric power generation, irrigation, drinking water supply, recreation, etc. The reduction in the economical life of dams suggests construction of new dams. However, this option is not seen effective because of their construction time, costs and insufficient geographical areas to build them. This thesis provides detailed information on the problem of sediment accumulation which reduces the economical life of the reservoir and on sediment control and removal methods in order to regain economic life of the dams. In addition, an application has been performed on Kesiksuyu (Mehmetli) Dam located in Sumbas town of Osmaniye province using the data of 1963 and 2007. Average sediment accumulation was determined by the finite field method. It was determined that a loss of 17.20 % of the total volume has occurred during the period of 44 years. The obtained temporal change maps were visualized using Geographic Information System (GIS).

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    Authors: Sarmaşık, Seher Sonay;

    Çalışma kapsamında, Delft3-D modelinde kullanılacak hidrodinamik ve meteorolojik parametreler belirlenmiş, mevcut hidrodinamik veriler DSİ ve EİEİ'den temin edilirken, meteorolojik veriler DMİ'den alınmıştır. Gölü besleyen ve gölün boşalımını sağlayan akarsular ve gölde belirlenen örnekleme noktalarında farklı analizler yapılmıştır. Gölün mevcut batimetrik haritasının güncellenmesi amacıyla arazi ölçümlerine çıkılmış, DSİ tarafından 1995 yılında hazırlanan batimetri haritası ile güncel ölçümler kıyaslanarak gölün alan-hacim değerlerindeki değişim belirlenmiştir. Mayıs 2008 Mayıs 2009 tarihleri arasındaki örnekleme periyodu sonunda model çalışmaları dört dönemde incelenmiş, dönemler için hassasiyet analizi uygulanarak taban pürüzlülüğünün göldeki hidrodinamik koşullar üzerindeki etkisi incelenmiştir.Yapılan duyarlılık analizi sonucunda gölün taban pürüzlülüğünün vejetasyona göre göl suyunun derinliğinde bir değişime neden olmadığı, ancak akım hızı etkilediği gözlenmiştir. Çalışmada rüzgarın göl yüzeyinde oluşturduğu akıntılar ve gölde neden olduğu çevrimler görülmüştür. Bu durumun gölde tam karışım sağladığı ve sediment tabakasını süspanse hale getirerek göldeki bulanıklığa neden olduğu sonucuna varılmıştır. The hydrodynamic and the meteorological parameters going to be used in Delft3D model are determined, available meteorological data was provided by DSI and EİEİ whereas DMI delivered the meteorological data. Analysis was conducted in sampling points within the lake and streams feeding and discharging the lake. In order to update the existing bathymetry map, field study was conducted and the changing in the area and volume values of the lake was determined with the comparison of existing bathymetry map prepared by DSİ in 1995 and current measurements. At the end of the sampling period between May 2008 and May 2009 model studies were examined within four periods, the hydrodynamic conditions in the lake was investigated by applying the sensitivity analysis on the effect of roughness in these periods.As a result of the sensitivity analysis according to vegetation on the lake roughness change is not caused by changes in the depth of the lake water, but the flow rate was affected. In addition circulations and currents caused by the effect of the wind on the lake surface were observed. Further this situation, provide complete mixture for the lake and cause the turbidity in lake by resuspension of sediment layer.

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    Açık Erişim@BUU
    Master thesis . 2012
    License: CC BY
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      Açık Erişim@BUU
      Master thesis . 2012
      License: CC BY
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    Authors: Onur Gönülal; Cem Dalyan;

    Abstract The objective of this study was to compare the distribution patterns of macroinvertebrate species between the Northeastern Levantine Sea and the Northeastern Aegean Sea. A total of 157 hauls were carried out by commercial trawlers at depths ranging from 30 to 410 m in both areas. The result of SIMPER analysis shows clear differences between the two surveyed areas except for the 300-410 m depth range. Ninety five species were found in the Northeastern Aegean Sea and 100 species in the Northeastern Levantine Sea. Of these species, Pyrosoma atlanticum is newly reported for the Turkish coast. Forty three species were common to both areas.

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    Oceanological and Hydrobiological Studies
    Article . 2017 . Peer-reviewed
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    Oceanological and Hydrobiological Studies
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      Oceanological and Hydrobiological Studies
      Article . 2017 . Peer-reviewed
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      Oceanological and Hydrobiological Studies
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    Authors: Guido Gnone; Michela Bellingeri; Sabina Airoldi; Joan Gonzalvo; +40 Authors

    We investigated the presence and diversity of cetaceans in the Mediterranean Sea, analysing the data collected by 32 different research units, over a period of 15 years (2004–2018), and shared on the common web-GIS platform named Intercet. We used the encounter rate, the species prevalence, and the Shannon diversity index as parameters for data analysis. The results show that cetacean diversity, in the context of the Mediterranean basin, is generally quite low when compared with the eastern Atlantic, as few species, namely the striped dolphin, the bottlenose dolphin, the fin whale, and the sperm whale, dominate over all the others. However, some areas, such as the Alboran Sea or the north-western Mediterranean Sea, which includes the Pelagos Sanctuary (the Specially Protected Area of Mediterranean Interest located in the northern portion of the western basin), show higher levels of diversity and should be considered hotspots to be preserved. Primary production and seabed profile seem to be the two main drivers influencing the presence and distribution of cetaceans, with the highest levels of diversity observed in areas characterized by high levels of primary production and high bathymetric variability and gradient. This collective work underlines the importance of data sharing to deepen our knowledge on marine fauna at the scale of the whole Mediterranean Sea and encourages greater efforts in the networking process, also to accomplish the requirements of the Marine Strategy Framework Directive, with particular reference to Descriptor 1: biological diversity is maintained.

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    Diversity
    Article . 2023
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  • Authors: Rozita Kian; Aykut Pamuk; Ahmet Cevdet Yalciner; Andrey Zaytsev;

    Tsunami induced flows expose the morphological changes at the coastal zone. The morphological changes due to tsunami motion could be categorized to sediment transportation and hence erosion, deposition, scouring. The recent devastating tsunamis in 2004 and 2011 have not only caused extensive damage on marine structures but also cause morphological changes especially in the sand coastal plains, river mouths and their surroundings. The sediment transports by storm wave have been studied extensively but the problem of tsunami and morphology still need further investigations. However, it is remained a developing field of study yet since the validation methods for real cases are complicated. In order to achieve a better validation, the data for both topography and bathymetry are necessary before and after the hazard. The distribution of morphological changes due to tsunamis can be governed by topography, tsunami current and the characteristics of ground material. Rouse number is one of the indicator to describe the initiation of sediment motion. Therefore the transport modes of the sediment can be observed by following the change of the Rouse number. In this paper the spatial and temporal change of Rouse number in the study domain during a tsunami is investigated. As the case study the tsunami inundation and morphological changes near Antalya region in Mediterranean Sea at south of Turkey due to a critical tsunami scenario is studied. The spatial and temporal changes of Rouse number is computed by the tsunami simulation and the possible movement of the ground materials are determined and discussed.

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  • Authors: Costas E. Synolakis; Ahmet Cevdet Yalciner; Jose C. Borrero; George Plafker;

    In the evening of November 3, 1994, a series of submarine landslides and associated waves destroyed the Pacific Arctic Railway Company (PARN) dock at Skagway, Alaska, killing one construction worker. Numerous geologic and hydrodynamic studies followed, in an effort to prove or disprove that construction failure was responsible for initiating the slide. We model the slide using two inundation models, the model known as TUNAMI--N2 (not TSUNAMI) developed at Tohoku University and the model VTCS--3 developed at the University of Southern California and now in use by NOAA and known as MOST. Both models when run under the same initial conditions and bathymetry provided consistent results about the hydrodynamic motions close to the PARN dock. The results qualitatively fit the eyewitness observations, using a combination of three slides, and suggest that the sliding started offshore along the fjord wall off the southern end of the dock and undermined the southern two thirds of the dock.

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    Authors: Basmacı, Ahmet Emre;

    Mikro batimetri verisinde karşılaşılan gürültülere ve ölçülen hatalı derinliklere uygulanan veri işlem teknikleri ile görüntü kalitesinin arttırılması yapılan çalışmanın temelini oluşturmaktdır. Hata miktarı çok olan ölçümler harita ortamında Bull’s eye etkisine neden olmaktadır.Geliştirilen yöntem; daha önceden eşit alanda bölünmüş harita parçaları üzerinden Bull’s eye etkisine sahip yerlerin, koordinatları belirli poligonlar içine alınmasına, tanımlanan alanlar içinde kalan verinin yeni oluşturulacak dosya içine yazılmaması esasına dayanmaktadır. Böylece bahsedilen nedenlerden kaynaklanan Bull’s eye etkilerinin haritadan yerleri belirlenmekte, silme işlemi ham veri üzerinden gerçekleştirilmektedir. Haritanın eşit parçalara bölünerek çalışılması hem haritalamada hem de Bull’s eye giderimindeki işlem zamanını kısaltmaktadır. Grid düğüm noktaları üzerinden çalışan eşik değer ortalama yöntemi ile birbirine komşu, boş olmayan grid düğüm noktaları belirlenmekte ve bütün grid boyunca, belirlenen filtre boyundaki alan içindeki ortalama derinlik değeri ile alan içindeki değerler önceden atanmış eşik değer ile ilişkilendirilmektedir. Böylece, ortalamadan çok büyük olan değerler yerine ortalama değerin atanması ani yalancı yükselimlerin oluşmasını engellemektedir. Gemi motorunun neden olduğu gürültü ışık yönlendirimli kabartma haritalarında küçük dalga boylu, geminin hareket doğrultusunda süreklilik arzeden istenmeyen yapılar oluşturmaktadır. Genlik spektrumunda ise gürültü, yüksek dalga sayılarında düşük genlikli salınımlar olarak gözlenmektedir. Geliştirilen high-cut filtreleme tekniği; Verinin genlik spektrumu ile aynı boyutta tasarlanmış bir kosinüs penceresi genlik spektrumuyla çarpılmakta ve iki boyutlu ters Fourier dönüşümü ile harita ortamına geçildiğinde gürültünün yok olduğu gözlenmektedir. İzmit Körfezi’nde Hersek Deltası’nın doğusunda, Kuzey Anadolu Fayı’nın Armutlu Yarımadası’nın kuzeyinde dip morfolojisinde yapmış olduğu etkiler görüntülenmiştir. İmralı Adası’nın kuzeyinde eskiden Çınarcık Çukuru’na dökülmekte olan bir nehir yatağının yukarı bölümünde doğrultu atım bileşeni yüksek bir fayın etkisi altında uğradığı deformasyon da tespit edilmiştir. Atım miktarından hareketle, Güney Sınır Fayı’nın yaşı 1150007500 yıl olarak tahmin edilmektedir. Visual quality of the bathymetry maps are enhanced by the help of data processing techniques, and this construct a fundamental basis for our project. Measurments of depths with higher variance cause sudden increment of the seafloor in the map domain that is called Bull’s eye effect. The way we remove the Bull’s eye effect is eliminating the incorrectly measured depths from the data set by bounding the regions on the map by poligons. After the map is mathematically devided into equal pieces, Bull’s eye effect removing process is executed . If it is seen that the Bull’s eye effects are removed in every piece, the map is reconstructed by equal pieces of areas. Dividing map into equal pieces saves time for computation and high amount of data can be mapped whatever the size of the data. Thereshold averaging is an alternative way of filtering the unconformities on the sea bottom. Along the whole grid the method is applied. The average value of predefined subarea is compared with each grid points. Thus the depth values which are greater than the mean value are recursively changed with the mean value along the whole grid. The noise caused by engine of the vessel is removed by high-cut filtering method. In the amplitude spectrum, noise corresponds to short amplitude oscillations in higher wave numbers. After the window is designed, the amplitude spectrum is multiplied with the cosine window in frequency domain. The part which shows an oscillation pattern in amplitude spectrum is multiplied by the zeros of the taper. Optimal filtered map shows the noise free image of the seafloor. Deformation pattern observed along the North Anatolian Fault in the Southern Marmara Sea is mapped. Upstream part of an old river in the northern part of the İmralı Island gives an idea about the age of the South Boundary Fault about 1150007500 years. Deformation caused by the right lateral movement of the South Boundary Fault in the upstream part of the river is consistent with the seismic sections in the literature. Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003 Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2003 Yüksek Lisans M.Sc.

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