抄録
This paper discusses the motion of fine bed sediment in Tone River Estuary by a vertical 2-D numerical simulation. The simulation model for stratified flow computation is based on k-..turbulent model which was already verified in the estuary by some existing studies. The model for SS transport contains a new formulation of SS concentration at the estuary bed which was deduced from a unified processing of some published flume experimental results and some field data collected in the estuary. Calculation result suggests that fine sediment transported from the river mouth by estuarine circulation becomes dominant in the lower estuary under saline wedge stagnation during non-flood season. On the other hand, the sediment from the upstream watershed may be still dominant in the upper estuary. The result is consistent with some published data about seasonal change of grain size distribution and chemical characteristics of the bed sediment collected in the estuary.
