Author(s): Mahdi Razaz; Kiyosi Kawanisi; Mahmoud F. Maghrebi
Linked Author(s): Kiyoshi Kawanishi
Keywords: No Keywords
Abstract: Prediction of cohesive sediment concentration and its transport is vital to managers in coping with problems such as wetland protection and restoration, maintenance of navigation channels, residual onshore sediment transport, etc. Detailed measurements and processed data are necessary tools for development and application of this knowledge. Various factors are involved in estuaries like: tidal oscillation, river discharge, and wind driven waves that make it hard to obtain realistic results from studying/modeling estuarine areas using laboratory methods. Seemingly implementing in situ measurements is inevitable. A point in the center of the ōta Floodway in 2.8 km far from the mouth was selected to deploy instruments during 25 hours of Aug. 2008. ōta Floodway is a part of tidally-dominated ōta River. A high-resolution current profiler (HRCP) was used to measure vertical profiles of turbulence parameters like Reynolds stress, eddy viscosity, and production/dissipation rates. An ADV was deployed to measure velocity components near the bed. Density data was collected every hour throughout the water column by a CTD. In the first ebb, the regime of flow was deeply disturbed by an unknown phenomenon that influenced all turbulence parameters. The stability function SM and proportionality constant B1 in Mellor-Yamada (M-Y) model was investigated and found to be different with suggested value in the original model.
Year: 2009