EFFECT OF INTERACTION BETWEEN NEARSHORE CURRENT AND FREE JET ON SEDIMENT TRANSPORT: A CASE STUDY USING STEADY FLOWS DISCHARGED FROM A POWER PLANT

Abstract

 Interaction between nearshore flow and river flow on sediment transport is investigated using steady flows discharged from Hamaoka Nuclear Power Plant. Aerial photos and field observations of drifting buoys show that the discharged flows change their current direction along nearshore current. We conducted laboratory experiments using fixed-bed model and confirmed that the current direction of discharged flow depends on the wave condition and the current direction changes when the wave height is larger than 1 m. The numerical model is improved to take account of the interaction between the discharged flows and nearshore current and the sediment transport and topography change in 1998 are numerically investigated. The result shows the effect of discharge flow on sediment transport appears only in nearshore region and its effect on the amount of nearshore sediment transport is little.