Abstract A computational fluid dynamics numerical model addressed the problem of local scouring and deposition calculation for non-cohesive sediment clear water conditions near single double cylindrical piers. The results piers correlate very well with physical model's while are higher than case pier, especially when large-eddy turbulence model, van Rijn bed-load transport equation, fine mesh s...

The content and calibration of the comprehensive generic 3D eutrophication model ECO for water and sediment quality is presented. Based on a computational grid for water and sediment, ECO is used as a tool for water quality management to simulate concentrations and mass fluxes of nutrients (N, P, Si), phytoplankton species, detrital organic matter, electron acceptors and related substances. ECO...

s: Calculation of sediment load through Rivers is one of basic issues through designing of Hydraulic structures. Studies about possibility of dam hydro and power plant and other hydraulic structure without consider of sedimentation behavior has very important role practically. Some empirical experience has been presented experimentally, defining and modifying of these equations and presentation...

Water-quality managers desire information on the temporal and spatial variability of contaminant concentrations and the magnitudes of watershed and bed-sediment loads in San Francisco Bay. To help provide this information, the Regional Monitoring Program for Trace Substances in the San Francisco Estuary (RMP) takes advantage of the association of many contaminants with sediment particles by con...

More than 760 Tampa Bay (Florida, U.S.A.) sediment samples have been analyzed for organic contaminants (PAHs, organochlorine pesticides, and PCBs) since 1993. Data were analyzed to assess status by habitat (defined by overlapping salinity zones and sediment type). The habitats most degraded by PAHs and pesticides were generally located in lower salinity, fine-grained sediment habitats, which ar...

1. Developing a 3D turbulence-resolving numerical model for fine sediment transport in the oscillatory boundary layer in order to understand how turbulencesediment interactions can determine the state of muddy seabed (transport modes). 2. Studying the attenuation of turbulence due to the presence of sediment via the interplay between sediment-induced density stratification and enhanced viscosit...

The objectives of this study are to use different types of indexes to assess the current pollution status in Mengkabong lagoon and select the best index to describe the Mengkabong sediment quality. The indexes used in this study were Enrichment Factor (EF), Geo-accumulation Index (Igeo), Pollution Load Index (PLI) and Marine Sediment Pollution Index (MSPI). Different indexes give diverse status...

The unmixing of grain-size distribution (GSD) with multivariate statistical analysis provides insight into sediment provenance, transport processes and environment conditions. In this article, we performed hierarchical clustering endmember modeling (CEMMA) to identify the sedimentary fluvial deposits at core HDZ04 drilled in paleofloodplain on north bank upper Yellow River. CEMMA results show t...