沿岸域における河川流出水の拡がりについて

Abstract

The aim of this study is to reveal fundamental flow behaviors in an estuary into which a river flows.The fresh water of river expands three dimensionally in the estuary, affected by buoyancy force due to salt water.Estuary topography, discharge of river and density difference between fresh and salt waters play dominant roles for flow field characteristics.As the first stage of study, the present paper deals with the numerical procedure to analyze the flows near the river mouth and in the estuary, and simulation using simplified estuary model.Simulation results show that radially expanding flow in surface layer is associated with radially converging flow in lower layer, and a prominent shearing layer characterize the whole flow field.