The Experts below are selected from a list of 50874 Experts worldwide ranked by ideXlab platform
Peter Dartnell Rikk G Kvitek - One of the best experts on this subject based on the ideXlab platform.
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Bathymetry [5m]--Offshore of Monterey Map Area, California
2016Co-Authors: Peter Dartnell Rikk G KvitekAbstract:This part of DS 781 presents data for 2-m and 5-m Bathymetry and shaded-relief maps of Offshore of Monterey map area, California. The raster data file is included in "Bathymetry_OffshoreMonterey.zip," which is accessible from http://dx.doi.org/10.5066/F7F47M6T. The 2-m and 5-m Bathymetry and shaded-relief maps of Offshore of Monterey map area, California, was generated from acoustic Bathymetry data collected by California State University, Monterey Bay (CSUMB) and by Monterey Bay Aquarium Research Institute (MBARI), as well as from bathymetric lidar data collected by the U.S. Army Corps of Engineers, Joint Airborne Lidar Bathymetry Center of Expertise (JALBTCX). Acoustic mapping was completed between 1998 and 2012 using a combination of 200-kHz/400-kHz Reson 7125, 100-kHz Reson 7111, 240-kHz Reson 8101, and 30-kHz Simrad EM-300 multibeam echosounders, as well as 234-kHz and 468-kHz SWATHplus bathymetric sidescan-sonar systems. Bathymetric lidar mapping was completed between 2009 and 2010 for the California Coastal Mapping Project (CCMP). These mapping missions combined to collect Bathymetry data from the shoreline to beyond the limit of California’s State Waters. NOTE: The horizontal datum of this Bathymetry data (NAD83) differs from the horizontal datum of other layers in this data release (WGS84).
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Bathymetry--Offshore Pigeon Point, California
2015Co-Authors: Peter Dartnell Rikk G KvitekAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of Offshore Pigeon Point, California. The raster data file is included in "Bathymetry_OffshorePigeonPoint.zip", which is accessible from http://dx.doi.org/10.5066/F7513W80 The Bathymetry and shaded-relief maps of Offshore Pigeon Point, California, were generated from Bathymetry data collected by California State University, Monterey Bay (CSUMB), by Fugro Pelagos, and by the U.S. Geological Survey (USGS). Mapping was completed between 2006 and 2009, using a combination of 400-kHz Reson 7125 and 244-kHz Reson 8101 multibeam echosounders, as well as a 234-kHz SWATHplus bathymetric sidescan-sonar system. These mapping missions combined to collect Bathymetry from about the 10-m isobath to beyond the 3-nautical-mile limit of California’s State Waters. NOTE: The horizontal datum of this Bathymetry data (NAD83) differs from the horizontal datum of other layers in this SIM (WGS84). Some Bathymetry grids within this map area were projected horizontally from WGS84 to NAD83 using ESRI tools to be more consistent with the vertical reference of the North American Vertical Datum of 1988 (NAVD88).
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Bathymetry--Offshore of Tomales Point, California
2015Co-Authors: Peter Dartnell Rikk G KvitekAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of the Offshore of Tomales Point map area, California. Raster data file is included in "Bathymetry_OffshoreTomalesPoint.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreTomalesPoint/data_catalog_OffshoreTomalesPoint.html. The Bathymetry and shaded-relief maps of the Offshore of Tomales Point Map Area, California, were generated from Bathymetry data collected by California State University, Monterey Bay (CSUMB), by Fugro Pelagos, and by the U.S. Geological Survey. Mapping was completed between 2004 and 2010, using a combination of 200-kHz and 400-kHz Reson 7125, and 244-kHz Reson 8101 multibeam echosounders, as well as 234-kHz and 468-kHz SEA SWATHPlus phase-differencing sidescan sonars. These mapping missions combined to collect Bathymetry from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters. NOTE: the horizontal datum of the Bathymetry data (NAD83) differs from the horizontal datum of other layers in this data series (WGS84). Some Bathymetry grids within this map were projected horizontally from WGS84 to NAD83 using ESRI tools to be more consistent with the vertical reference of the North American Vertical Datum of 1988 (NAVD88). These data are not intended for navigational purposes.
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Bathymetry Hillshade--Offshore Pigeon Point, California
2015Co-Authors: Peter Dartnell Rikk G KvitekAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of Offshore Pigeon Point, California. The raster data file is included in "BathymetryHS_OffshorePigeonPoint.zip", which is accessible from http://dx.doi.org/10.5066/F7513W80 The Bathymetry and shaded-relief maps of Offshore Pigeon Point, California, were generated from Bathymetry data collected by California State University, Monterey Bay (CSUMB), by Fugro Pelagos, and by the U.S. Geological Survey (USGS). Mapping was completed between 2006 and 2009, using a combination of 400-kHz Reson 7125 and 244-kHz Reson 8101 multibeam echosounders, as well as a 234-kHz SWATHplus bathymetric sidescan-sonar system. These mapping missions combined to collect Bathymetry from about the 10-m isobath to beyond the 3-nautical-mile limit of California’s State Waters.
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Bathymetry Hillsahde--Offshore of Tomales Point, California
2015Co-Authors: Peter Dartnell Rikk G KvitekAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of the Offshore of Tomales Point map area, California. Raster data file is included in "BathymetryHS_OffshoreTomalesPoint.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreTomalesPoint/data_catalog_OffshoreTomalesPoint.html. The Bathymetry and shaded-relief maps of the Offshore of Tomales Point Map Area, California, were generated from Bathymetry data collected by California State University, Monterey Bay (CSUMB), by Fugro Pelagos, and by the U.S. Geological Survey. Mapping was completed between 2004 and 2010, using a combination of 200-kHz and 400-kHz Reson 7125, and 244-kHz Reson 8101 multibeam echosounders, as well as 234-kHz and 468-kHz SEA SWATHPlus phase-differencing sidescan sonars. These mapping missions combined to collect Bathymetry from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters.
J N Newman - One of the best experts on this subject based on the ideXlab platform.
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cloaking of a vertical cylinder in waves using variable Bathymetry
Journal of Fluid Mechanics, 2014Co-Authors: Richard Porter, J N NewmanAbstract:The paper describes a process which allows a vertical circular cylinder subject to plane monochromatic surface gravity waves to appear invisible to the far-field observer. This is achieved by surrounding the cylinder with an annular region of variable Bathymetry. Two approaches are taken to investigate this effect. First a mild-slope approximation is applied to the governing linearised three-dimensional water wave equations to formulate a depth-averaged two-dimensional wave equation with varying wavenumber over the variable bathmetry. This is then solved by formulating a domain integral equation, solved numerically by discretisation. For a given set of geometrical and wave parameters, the Bathymetry is selected by a numerical optimisation process and it is shown that the scattering cross-section is reduced towards zero with increasing refinement of the Bathymetry. A fully three-dimensional boundary-element method, based on the WAMIT solver (see www.wamit.com ) but adapted here to allow for depressions in the bed, is used to assess the accuracy of the mild-slope results and then further numerically optimise the Bathymetry towards a cloaking structure. Numerical results provide strong evidence that perfect cloaking is possible for the fully three-dimensional problem. One practical application of the results is that cloaking implies a reduced mean drift force on the cylinder.
Steven Constable - One of the best experts on this subject based on the ideXlab platform.
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2d marine controlled source electromagnetic modeling part 2 the effect of Bathymetry
Geophysics, 2007Co-Authors: Yuguo Li, Steven ConstableAbstract:Marine controlled-source electromagnetic (CSEM) data are strongly affected by Bathymetry because of the conductivity contrast between seawater and the crust below the seafloor. We simulate the marine CSEM response to 2D Bathymetry using our new finite element (FE) code, and our numerical modeling shows that all electric and magnetic components are influenced by bathymery, but to different extents. Bathymetry effects depend upon transmission frequency, seabed conductivity, seawater depth, transmitter-receiver geometry, and roughness of the seafloor topography. Bathymetry effects clearly have to be take into account to avoid the misinterpretation of marine CSEM data sets.
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2D marine controlled-source electromagnetic modeling: Part 2 — The effect of Bathymetry
Geophysics, 2007Co-Authors: Yuguo Li, Steven ConstableAbstract:Marine controlled-source electromagnetic (CSEM) data are strongly affected by Bathymetry because of the conductivity contrast between seawater and the crust below the seafloor. We simulate the marine CSEM response to 2D Bathymetry using our new finite element (FE) code, and our numerical modeling shows that all electric and magnetic components are influenced by bathymery, but to different extents. Bathymetry effects depend upon transmission frequency, seabed conductivity, seawater depth, transmitter-receiver geometry, and roughness of the seafloor topography. Bathymetry effects clearly have to be take into account to avoid the misinterpretation of marine CSEM data sets.
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Special Section — Marine Control-Source Electromagnetic Methods 2D marine controlled-source electromagnetic modeling: Part 2 — The effect of Bathymetry
2007Co-Authors: Yuguo Li, Steven ConstableAbstract:Marine controlled-source electromagnetic CSEM data are strongly affected by Bathymetry because of the conductivity contrast between seawater and the crust below the seafloor.WesimulatethemarineCSEMresponseto2DBathymetry using our new finite element FE code, and our numerical modeling shows that all electric and magnetic components are influenced by bathymery, but to different extents. Bathymetry effects depend upon transmission frequency, seabedconductivity,seawaterdepth,transmitter-receivergeometry,androughnessoftheseafloortopography.Bathymetry effects clearly have to be take into account to avoid the misinterpretationofmarineCSEMdatasets.
Peter Dartnell Rikk G. Kvitek Carrie K. Bretz - One of the best experts on this subject based on the ideXlab platform.
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Bathymetry--Offshore of San Francisco, California
2014Co-Authors: Peter Dartnell Rikk G. Kvitek Carrie K. BretzAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of Offshore of San Francisco, California (raster data file is included in "Bathymetry_OffshoreSanFrancisco.zip," which is accessible from https://pubs.usgs.gov/ds/781/OffshoreSanFrancisco/data_catalog_OffshoreSanFrancisco.html. The Bathymetry and shaded-relief maps of Offshore of San Francisco, California, were generated from Bathymetry data collected by Fugro Pelagos, and by California State University, Monterey Bay (CSUMB). Mapping was completed between 2004 and 2008, using a combination of 400-kHz Reson 7125 and 244-kHz Reson 8101 multibeam echosounders. These mapping missions combined to collect Bathymetry (sheets 1, 2) from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters. A large portion of this map area was re-mapped in 2009, however the older Bathymetry data were used in this map due to co-registered, acoustic backscatter data. NOTE: the horizontal datum of the bathymtry data (NAD83) differs from the horizontal datum of other layers in this SIM (WGS84). Some Bathymetry grids within this map were projected horizontally from WGS84 to NAD83 using ESRI tools to be more consistent with the vertical reference of the North American Vertical Datum of 1988 (NAVD88). These data are not intended for navigational purposes.
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Bathymetry Hillshade--Offshore of San Francisco, California
2014Co-Authors: Peter Dartnell Rikk G. Kvitek Carrie K. BretzAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of Offshore of San Francisco, California (raster data file is included in "BathymetryHS_OffshoreSanFrancisco.zip," which is accessible from https://pubs.usgs.gov/ds/781/OffshoreSanFrancisco/data_catalog_OffshoreSanFrancisco.html. The Bathymetry and shaded-relief maps of Offshore of San Francisco, California, were generated from Bathymetry data collected by Fugro Pelagos, and by California State University, Monterey Bay (CSUMB). Mapping was completed between 2004 and 2008, using a combination of 400-kHz Reson 7125 and 244-kHz Reson 8101 multibeam echosounders. These mapping missions combined to collect Bathymetry (sheets 1, 2) from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters. A large portion of this map area was re-mapped in 2009, however the older Bathymetry data were used in this map due to co-registered, acoustic backscatter data.
Peter Dartnell Andrew C. Ritchie David P. Finlayson - One of the best experts on this subject based on the ideXlab platform.
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Bathymetry Hillshade--Offshore Santa Cruz, California
2015Co-Authors: Peter Dartnell Andrew C. Ritchie David P. FinlaysonAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of Offshore Santa Cruz, California. The raster data file is included in "BathymetryHS_OffshoreSantaCruz.zip", which is accessible from http://dx.doi.org/10.5066/F7TM785G. The Bathymetry and shaded-relief maps of Offshore Santa Cruz, California, were generated from Bathymetry data collected by the U.S. Geological Survey (USGS). Mapping was completed in 2009 using a 234-kHz SWATHplus bathymetric sidescan-sonar system. The mapping mission collected Bathymetry data from about the 10-m isobath to beyond the 3-nautical-mile limit of California’s State Waters. NOTE: The horizontal datum of this Bathymetry data (NAD83) differs from the horizontal datum of other layers in this data release (WGS84).
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Bathymetry--Offshore Santa Cruz, California
2015Co-Authors: Peter Dartnell Andrew C. Ritchie David P. FinlaysonAbstract:This part of DS 781 presents data for the Bathymetry and shaded-relief maps of Offshore Santa Cruz, California. The raster data file is included in "Bathymetry_OffshoreSantaCruz.zip", which is accessible from http://dx.doi.org/10.5066/F7TM785G. The Bathymetry and shaded-relief maps of Offshore Santa Cruz, California, were generated from Bathymetry data collected by the U.S. Geological Survey (USGS). Mapping was completed in 2009 using a 234-kHz SWATHplus bathymetric sidescan-sonar system. The mapping mission collected Bathymetry data from about the 10-m isobath to beyond the 3-nautical-mile limit of California’s State Waters. NOTE: The horizontal datum of this Bathymetry data (NAD83) differs from the horizontal datum of other layers in this data release (WGS84).
