Abstract
In this paper, we conducted numerical analysis of coastal current change due to a construction of oyster reefs at the Shiotagawa river mouth in the Ariake sea. In the numerical model we developed, the fifth order WENO (Weighted Essentially Non-Oscillatory) scheme was applied to discretize advective terms in governing equations, and the two-way nesting approach with tideland treatment was introduced into the model. The changes of coastal current by reef construction were examined by comparing results with current state and between reef construction scenarios. Our analysis results showed that the time-averaged velocities could be decrease by the reef construction at the right bank of the river mouth. Moreover, our results suggested that the time-averaged velocities could be decrease by withdraw of existing oyster reefs at the right bank of the river mouth.
