The Effect of Runoff on Saltwater Intrusion in Weak Tide Estuary

Abstract

Modaomen Estuary is a typical weak tidal estuary. The saltwater movement distance is not monotonic relationship with the tidal dynamics, it is also related to the strength of the salt wedge. In different phase of saltwater intrusion, saltwater intrusion distance has different responses to runoff. Through physical model tests, salt inhibition effect due to runoff at different stages had been studied. With the same total runoff in the half moon tidal cycle, methods of adjusting the amount of runoff distribution for better salt inhibition effect are proposed in the article. Increasing the runoff after neap tide can effectively inhibit the intrusion of saltwater.