sediment survey Articles
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Impact of dumped sediments on subaqueous dunes, outer Weser Estuary, German Bight, southeastern North Sea
The impact of dredge spoil disposal on asymmetrical large-scale dunes has been studied at a disposal site in a shallow subtidal area of the outer Weser Estuary (German Bight, southeastern North Sea). Between June and December 1998, this site was used for the disposal of ~3×106 m3 dredge spoil. Repeated bathymetric surveys with a multibeam echosounder system reveal that the artificial supply of ...
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Project - Clark Magnet High School
Clark Magnet High School emphasizes science and technology for high school students in the Glendale Unified School District near Los Angeles. Marine Science Research classes taught by Ms. Dominique Evans-Bye, utilize a VideoRay ROV to teach students about environmental awareness and applied robotics. Ms. Evans-Bye first acquired the VideoRay in 2006, and upgraded to a Pro 4 named “Johnny ...
By VideoRay LLC
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Mapping top of rock and sediment thickness case study
San Felipe, Panama A port expansion was planned off the coast of San Felipe, Panama. GeoView was tasked to provide bathymetric information within the survey area, map the top of rock and evaluate the thickness of the overlying marine sediments. The survey area was approximately 300 hectares in size. GeoView collected sub-bottom profiling and bathymetry data along transect lines spaced ...
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Influence of environmental factors on abundance and temporal variation of benthic fauna resources in the eutrophic Tha Chin estuary, Samut Sakhon province, Thailand
The influence of environmental factors on the abundance and temporal variation of benthic fauna resources was studied in the eutrophic Tha Chin estuary located in Samut Sakhon province. The objectives were to analyze the status of abundance and temporal variation of the benthic fauna and to clarify the impacts from environmental factors (water and sediment quality). Field surveys were conducted ...
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USGS Open File report: Field Evaluation of the Sequoia Scientific LISST-ABS Acoustic Backscatter Sediment Sensor
The USGS has evaluated Sequoia’s LISST-ABS at 10 streamflow-gaging stations, collecting LISST-ABS and suspended sediment concentration (SSC) data between January 2016 and February 2018. The evaluation also compared the LISST-ABS to standard turbidity sensors normally used by the USGS. The results are presented in this report: Manaster, A.E., Straub, T.D., Wood, M.S., Bell, J.M., Dombroski, ...
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Calibration of a 2-D morphodynamic model using water–sediment flux maps derived from an ADCP recording
This study compared numerical simulations of the hydro-morphodynamics of a stretch of the Po River (Italy) to detailed measurements of the river's morphology and water–sediment fluxes. A survey of the 8-km-long, 250-m-wide river section, previously described in former publications, was performed using two vessels. The first was equipped with a multibeam echo sounder for bathymetry ...
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Seismic refraction and MASW case study
Proposed Gatun Bridge, Colon, Panama The Autoridad del Canal de Panama (ACP) conducted a geotechnical investigation along the footprint of a proposed bridge crossing of the Panama Canal, north of the Gatun Lock. As part of the geotechnical study, GeoView, Spotlight Geophysics and ATI Panamericana were tasked to provide seismic P-wave and S-wave velocity structure of the subsurface. The ...
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ME40 丨OceanAlpha Delivers Innovative USV Solution to Mining Industry - Case Study
OceanAlpha’s autonomous bathymetric survey boat ME40 for hydrographic survey has been applied to the mining industry for tailing dam surveys, in addition to its common application in lakes, rivers, reservoirs and oceans. All you need to do is set up the survey way-points and the boat will go automatically with GPS navigation and acquire online bathymetric data. SURVEY CHALLENGES ...
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Dredging Short Courses
By Eric Lillberg, SRS Crisafulli Senior Applications Engineer When I first started as an applications engineer for SRS Crisafulli, I searched for information on the subject of dredging. I was surprised to find there was very little non-commercial content available. I have since found a pair of short courses, offered annually by Texas A&M, which I recommend highly to any professional ...
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Environmental monitoring of two fish waste ocean disposal sites in Newfoundland and Labrador, Canada
Sediment contaminant and benthic community surveys were conducted at two fish waste ocean disposal sites in Newfoundland and Labrador, Canada, to assess the environmental impacts of the disposal activities. Despite a dispersive ocean environment, fish wastes accumulated at both sites, initially disturbing the benthic community through organic enrichment and oxygen depletion, but causing no ...
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Effects‐based marine ecological risk assessment at a polychlorinated biphenyl‐contaminated site in Saglek, Labrador, Canada
Although the presence and distribution of polychlorinated biphenyls (PCBs) in Arctic marine environments has been well documented, the implications for the health of biota are poorly understood. In the present study, multiple lines of evidence, including site‐specific effects data, were used to assess PCB‐related risks to marine biota at a contaminated military site in Saglek Bay, Labrador, ...
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Antibiotic resistance genes a growing problem in chinese estuaries
Large amounts of antibiotic resistance genes (ARGs) have been found throughout estuaries in coastal China, and scientists say they’re causing potentially dangerous changes to local bacteria. When bacteria mutate and become resistant to antibiotics, it endangers human health and life. If antibiotics can’t work properly, infectious diseases will increase, and health-care costs will ...
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