measure sediment concentration Articles
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Numerical prediction of suspended sediment concentrations in the Ariake Sea, Japan, using a time-dependent sediment resuspension and deposition model
The Ariake Sea, a typical semi-closed bay located in Kyushu Island, western Japan, has a maximum tidal range of 6 m in spring tide, and its vast tidal flats are composed of both sandy bottom areas and muddy bottom areas. In this study, two-dimensional depth-averaged finite difference numerical models have been developed for predicting the tidal flow velocity and suspended sediment concentration ...
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Development of a water quality tank model classified by land use for nitrogen load reduction scenarios
The Ariake Sea, a typical semi-closed bay located in Kyushu Island, western Japan, has a maximum tidal range of 6 m in spring tide, and its vast tidal flats are composed of both sandy bottom areas and muddy bottom areas. In this study, two-dimensional depth-averaged finite difference numerical models have been developed for predicting the tidal flow velocity and suspended sediment concentration ...
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How the LISST-ABS works
INTRODUCTION: Sequoia’s Acoustic Backscatter Sensor, LISST-ABS is designed to measure suspended sediment concentration at a point. Unlike ADCP’s which may record similar backscatter strength at multiple points along the acoustic beams (‘ranges’), the LISST-ABS only reports backscatter signal strength at a single point about 5 cm from the transducer. The instrument ...
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Predicting bioaccumulation of polycyclic aromatic hydrocarbons in soft‐shelled clams (Mya arenaria) using field deployments of polyethylene passive samplers
Biota‐sediment accumulation factors (BSAF), frequently used to predict tissue concentrations of organisms living within and above sediments contaminated with hydrophobic organic chemicals (HOCs), often produce inaccurate estimates. Hence, freely‐dissolved porewater concentrations, CW, have also been investigated as predictors of organism tissue concentrations, but they are more difficult to ...
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Relative toxicity of bifenthrin to Hyalella azteca in 10‐day vs. 28‐day exposures
Many watersheds in the Central Valley region of California are listed as impaired due to pyrethroid‐associated sediment toxicity. The Central Valley Regional Water Quality Control Board is developing numeric sediment quality criteria for pyrethroids, beginning with bifenthrin. Criteria are being developed using existing data, along with data from 10d and 28d toxicity tests with Hyalella ...
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Comparing Optical Turbidity With LISST-ABS
For measuring suspended sediments, the use of optical backscatter sensors or other turdibity sensors is widespread. At the same time, it is understood that these sensors respond to total particle area, not volume or mass. In other words, optical turbidity sensors have this property: their sensitivity decreases with increasing grain size. The decrease follows 1/diameter. This has been published ...
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Predicting toxicity to Hyalella azteca in pyrogenic‐impacted sediments – Do we need to analyze for all 34 PAHs?
PAHs are major drivers of risk at many urban/industrialized sediment sites. The USEPA currently recommends using measurements of 18 parent + 16 groups of alkylated PAHs (PAH‐34) to assess the potential for sediment‐bound PAHs to impact benthic organisms at these sites. ASTM Method D7363‐13 was developed to directly measure low‐level sediment pore water PAH concentrations. These concentrations ...
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