木曽川下流域における水制群周辺の流れに関する数値シミュレーション(環境情報学部開設5周年記念号)

抄録

The river flows with a series of spur dikes are investigated by a numerical model based on the depth-averaged plane 2D shallow water equations. The numerical method proposed by Nagata (1999) is used for the computations. The basic equations in the model are composed with contravariant components of velocity vectors in generalized curvilinear coordinate system. The effects of spur dikes are incorporated into the model by tuning the local value of manning roughness coefficients. The numerical method is applied to Kiso River with effects of tidal flows and the model performance is examined. Fundamental features of the river flows with spur dikes are simulated qualitatively by the present model.