Abstract
The purpose of this study is to improve the method for calculating 2-dimensional shallow flow in which sub- and super-critical conditions coexist.The flow is discribed by using equations of mass and momentum conservation, which incorporate arbitrary curve-linear space coordinates. As a numerical solution method, MacCormack's time-splitting finite difference scheme is recommended. Some problems in practical application of this model are discussed from several points of view. An experiment is performed by using a flume with gradually expanding width and sudden change in bed slope. The applicability of the numerical model is tested by comparing experimental and caluculated results.
