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  • Authors: Shusun Li; M. Jeffrtes; K. Morris;

    There are thousands of shallow lakes on the North Slope of Alaska. They are one of the most obvious manifestations of the hydrological system at work, and they play an important role in physical, biological and biogeochemical processes in the tundra environment. The depth of the lakes is a key determinant of these processes, yet few bathymetric data are available. The authors conducted a pilot study to investigate the ability of interferometric synthetic aperture radar (INSAR) to derive bathymetry of the shallow lakes on the Alaskan North Slope. Because lake ice is transparent in the microwave region, they hypothesize that INSAR can see through the lake ice and reveal the topography beneath the grounded lake ice. The analytical result of a sensitivity analysis indicates that interferometric phase is more sensitive to lake bathymetry under grounded lake ice than to the land surface topography. A series of interferograms are derived for the area near Point Barrow, Alaska, from pairs of ERS-1 3-day repeat SAR images acquired in January through March 1994. Floating ice is identified by the noisy phase pattern and low coherence, which are due to the increase of the ice thickness in the interim. Grounded ice is identified by the clean phase pattern and relatively high coherence, because no further growth occurs once the lake has frozen to the bottom. The phase difference between the grounded ice and the surrounding land reflects the lake bottom topography. The final usefulness of this new INSAR application needs to be verified and validated.

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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: Simone Garuglieri; Dario Madeo; Alessandro Pozzebon; Roberto Zingone; +2 Authors

    This paper presents the development of an integrated system for the monitoring of aquatic ecosystems aiming at providing a set of tools to identify critical environmental scenarios and then adopt strategic decisions for the management of lakes, rivers or coastal areas. The whole monitoring infrastructure is centered on the realization of a low cost Unmanned Surface Vehicle (USV) to be employed for the collection of crucial parameters about water quality. The vehicle, called WeMo (Water Environmental Mobile Observer) has been realized with low cost off-the-shelf components and is provided with a modular array of sensors to measure chemical and physical parameters as well as to perform bathymetry. It can be controlled either manually or automatically and it is also provided with LoRa Wide Range wireless connectivity enabling it to automatically store the collected data onto a cloud platform. Data analytics tools have also been introduced in order to develop a complete monitoring ecosystem covering all the tasks of data collection, storage and analysis.

    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 Archivio istituziona...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
    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
    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
    https://doi.org/10.1109/sas.20...
    Conference object . 2019 . Peer-reviewed
    License: IEEE Copyright
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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 Archivio istituziona...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
      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
      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
      https://doi.org/10.1109/sas.20...
      Conference object . 2019 . Peer-reviewed
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  • Authors: Mark D. Orzech; Ad Reniers; Edward B. Thornton; Jamie MacMahan;

    The formation of beach megacusps in the presence of rip channel bathymetry is investigated using time-averaged video and simulated with XBeach, a recently developed coastal sediment transport model. A review of four years of video and wave data from Sand City, CA, indicates that megacusp embayments most often form shoreward of rip channels under larger waves (significant wave height (Hs) = 1.5 – 2.0 m) but also occasionally appear shoreward of shoals when waves are smaller and daily mean water level is higher. After calibration to the Sand City site, XBeach is shown to hindcast measured shoreline change moderately well (skill = 0.41) but to overpredict the erosion of the beach face. Simulations with small to moderate waves (Hs ≤ 1.2 m) suggest, similar to field data, that megacusps will form shoreward of either rip channels or shoals, depending on mean water level and pre-existing beach shape. A frequency-based analysis of sediment transport forcing indicates that the mean flow plays the dominant role in each type of megacusp formation, but that very-low-frequency (VLF) oscillations in suspended sediment and advective flow are also significant.

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    Authors: William L. Wood;

    Wave height variability along the crest of breaking waves is shown to be a significant factor in the assessment of surf zone dynamics. Variations in excess of 50 percent of the maximum wave height can occur along a single crest without significant variations in bathymetry. The horizontal scale of this longshore variability in crest height corresponds to the wave length of incident breaking waves. Four possible mechanisms for this variability are postulated and then evaluated individually on the basis of field observations. A major result of these evaluations is that two-dimensional shallow-water wave equations appear to be inappropriate for expressing natural surf zone wave transformations and water motions even under the condition of waves encroaching on a plane sloping bottom. Consequently, three-dimensional equations of surf should be used for describing most natural surf zone dynamics.

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    Coastal Engineering Proceedings
    Article . 1976 . Peer-reviewed
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    https://doi.org/10.1061/978087...
    Conference object . 1977 . Peer-reviewed
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      Coastal Engineering Proceedings
      Article . 1976 . Peer-reviewed
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  • Authors: Gerassimos A. Athanassoulis; Konstandinos A. Belibassakis;

    A non-linear coupled-mode system of horizontal equations is derived with the aid of Luke’s (1967) variational principle, which models the evolution of nonlinear water waves in intermediate depth over a general bathymetry. The vertical structure of the wave field is exactly represented by means of a local-mode series expansion of the wave potential, Athanassoulis & Belibassakis (2000). This series contains the usual propagating and evanescent modes, plus two additional modes, the free-surface mode and the sloping-bottom mode, enabling to consistently treat the non-vertical end-conditions at the free-surface and the bottom boundaries. The system fully accounts for the effects of non-linearity and dispersion.Copyright © 2002 by ASME

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  • Authors: Santiago Abbate; Javier Areta;

    We present the progress made in the development of an instrumentation system for fresh water bathymetry. Several design considerations are analyzed, such as transducer element characterization, SONAR equation modelling, and conceptual design of the instrumentation electronics. A Class-D, “Half-Bridge” configuration is proposed to drive the transducer used for transmission and reception. General system modules are also introduced. Future work involves the construction of a prototype based on this design to evaluate its performance.

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  • Authors: J. Vitorino; Sérgio H. C. D. Larangeiro; Francisco Nildo da Silva; José Eduardo Brasil Pereira Pinto; +1 Authors

    We describe the development of an operational forecast system for the NAzare Canyon area (W Portugal) which is presently being conducted at Instituto Hidrografico (IHPT). The system integrates a number of numerical models aimed to simulate and forecasts the wave conditions, the circulation promoted in the canyon area by wind forcing, interactions with the deep sea circulation or tides, and the littoral processes. The forecast system is planned to make an extensive use of the real-time observations collected by multi-parametric platforms maintained by IH in the Nazare Canyon area as part being developed sic guidelines for preparing papers for conference proceedings.

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    Authors: Tronstad, Tron; Hovem, Jens Martin;

    Marine seismic exploration uses air guns or air gun arrays to generate high energy, short duration acoustic pulses deep into the ocean floor but some of the seismic/acoustic energy remains in the water column and can propagate to considerably distances. This may cause disturbance to marine life and there is evidence that this noise can cause reactions on the behavior of fish resulting in reduced catches. This has resulted in severe conflict of interest between the petroleum and the fishing industry. The ultimate goal of the work that is presented here is to be able to estimate the minimum distance from a seismic survey to avoid significant negative effects on fish behavior and fish catch. We have developed a propagation model, based on ray theory that can deal with range dependent bathymetry and depth dependent sound speed profiles. This paper describes briefly the model and its capabilities, followed by the presentation of several relevant examples of propagation over range dependent bathymetry with typical sound speed profiles from different geographical locations and seasons. The main conclusion is that both the bathymetry, the geo-acoustic properties of the bottom and the oceanographic conditions have significant impact on the propagation of seismic noise. The focusing of sound, caused by the bathymetry and/or sound speed profile, may create regions with hot spots where the sound level is significantly higher than normally expected. Common range dependent sound propagation methods for cylindrical and spherical spreading, e.g. -10log(r) and -20log(r), are also compared to the modeled results. ©2011 MTS. This is the authors' accepted version of the manuscript. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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    Part of book or chapter of book . 2011
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    Part of book or chapter of book . 2011
    https://doi.org/10.23919/ocean...
    Conference object . 2011 . Peer-reviewed
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      Part of book or chapter of book . 2011
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    Authors: Sean Pecknold; Nicos Pelavas; Garry J. Heard;

    During the summer of 2012, a field trial was held in Barrow Strait, south of Devon Island in the Canadian Arctic. The trial included a set of acoustic transmission loss experiments recorded on Starfish Sensor Cubes, which include a 1-m cube of seven hydrophones operating in the frequency range of 5–750 Hz. The transmission loss runs consisted of 10-min and 20-min duration transmissions of 400 and 500 Hz tones made at a discrete set of distances up to 60 km from the recorders. Supporting environmental measurements included sets of CTD (conductivity-temperature-depth) profiles and bathymetric measurements. The effects of the measured environmental properties and variability are investigated via propagation modeling, and compared to the experimental data acquired during these experiments.

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    The Journal of the Acoustical Society of America
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    Authors: Dariusz Popielarczyk; Tomasz Templin; Michał Łopata;
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    https://doi.org/10.5593/sgem20...
    Conference object . 2011 . Peer-reviewed
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      https://doi.org/10.5593/sgem20...
      Conference object . 2011 . Peer-reviewed
      License: CC BY SA
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2,393 Research products
  • Authors: Shusun Li; M. Jeffrtes; K. Morris;

    There are thousands of shallow lakes on the North Slope of Alaska. They are one of the most obvious manifestations of the hydrological system at work, and they play an important role in physical, biological and biogeochemical processes in the tundra environment. The depth of the lakes is a key determinant of these processes, yet few bathymetric data are available. The authors conducted a pilot study to investigate the ability of interferometric synthetic aperture radar (INSAR) to derive bathymetry of the shallow lakes on the Alaskan North Slope. Because lake ice is transparent in the microwave region, they hypothesize that INSAR can see through the lake ice and reveal the topography beneath the grounded lake ice. The analytical result of a sensitivity analysis indicates that interferometric phase is more sensitive to lake bathymetry under grounded lake ice than to the land surface topography. A series of interferograms are derived for the area near Point Barrow, Alaska, from pairs of ERS-1 3-day repeat SAR images acquired in January through March 1994. Floating ice is identified by the noisy phase pattern and low coherence, which are due to the increase of the ice thickness in the interim. Grounded ice is identified by the clean phase pattern and relatively high coherence, because no further growth occurs once the lake has frozen to the bottom. The phase difference between the grounded ice and the surrounding land reflects the lake bottom topography. The final usefulness of this new INSAR application needs to be verified and validated.

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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: Simone Garuglieri; Dario Madeo; Alessandro Pozzebon; Roberto Zingone; +2 Authors

    This paper presents the development of an integrated system for the monitoring of aquatic ecosystems aiming at providing a set of tools to identify critical environmental scenarios and then adopt strategic decisions for the management of lakes, rivers or coastal areas. The whole monitoring infrastructure is centered on the realization of a low cost Unmanned Surface Vehicle (USV) to be employed for the collection of crucial parameters about water quality. The vehicle, called WeMo (Water Environmental Mobile Observer) has been realized with low cost off-the-shelf components and is provided with a modular array of sensors to measure chemical and physical parameters as well as to perform bathymetry. It can be controlled either manually or automatically and it is also provided with LoRa Wide Range wireless connectivity enabling it to automatically store the collected data onto a cloud platform. Data analytics tools have also been introduced in order to develop a complete monitoring ecosystem covering all the tasks of data collection, storage and analysis.

    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 Archivio istituziona...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
    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
    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
    https://doi.org/10.1109/sas.20...
    Conference object . 2019 . Peer-reviewed
    License: IEEE Copyright
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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 Archivio istituziona...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
      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
      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
      https://doi.org/10.1109/sas.20...
      Conference object . 2019 . Peer-reviewed
      License: IEEE Copyright
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  • Authors: Mark D. Orzech; Ad Reniers; Edward B. Thornton; Jamie MacMahan;

    The formation of beach megacusps in the presence of rip channel bathymetry is investigated using time-averaged video and simulated with XBeach, a recently developed coastal sediment transport model. A review of four years of video and wave data from Sand City, CA, indicates that megacusp embayments most often form shoreward of rip channels under larger waves (significant wave height (Hs) = 1.5 – 2.0 m) but also occasionally appear shoreward of shoals when waves are smaller and daily mean water level is higher. After calibration to the Sand City site, XBeach is shown to hindcast measured shoreline change moderately well (skill = 0.41) but to overpredict the erosion of the beach face. Simulations with small to moderate waves (Hs ≤ 1.2 m) suggest, similar to field data, that megacusps will form shoreward of either rip channels or shoals, depending on mean water level and pre-existing beach shape. A frequency-based analysis of sediment transport forcing indicates that the mean flow plays the dominant role in each type of megacusp formation, but that very-low-frequency (VLF) oscillations in suspended sediment and advective flow are also significant.

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    Authors: William L. Wood;

    Wave height variability along the crest of breaking waves is shown to be a significant factor in the assessment of surf zone dynamics. Variations in excess of 50 percent of the maximum wave height can occur along a single crest without significant variations in bathymetry. The horizontal scale of this longshore variability in crest height corresponds to the wave length of incident breaking waves. Four possible mechanisms for this variability are postulated and then evaluated individually on the basis of field observations. A major result of these evaluations is that two-dimensional shallow-water wave equations appear to be inappropriate for expressing natural surf zone wave transformations and water motions even under the condition of waves encroaching on a plane sloping bottom. Consequently, three-dimensional equations of surf should be used for describing most natural surf zone dynamics.

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    Coastal Engineering Proceedings
    Article . 1976 . Peer-reviewed
    Data sources: Crossref
    https://doi.org/10.1061/978087...
    Conference object . 1977 . Peer-reviewed
    Data sources: Crossref
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      Coastal Engineering Proceedings
      Article . 1976 . Peer-reviewed
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      https://doi.org/10.1061/978087...
      Conference object . 1977 . Peer-reviewed
      Data sources: Crossref
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