Study of River Management Method Using Mltipurpose Numerical Calculation at Small and Midium-sized River

Abstract

 Almost river length was very short and steep slope in Kagawa Prefecture. The flood occurs and it becomes a problem in the river especially. It is necessary to manage usually so that the river shape may influence at the flood. From this reason, it is important to grasp the river characteristics at the flood. However, in order to obtain frequent topography data at a river, it is necessary to expend large amounts of time and cost. Therefore, if it is possible to estimate river characteristics from numerical simulation, it will be practically effective for river management.
 In this study, river characteristics are investigated through river cross-section surveying. Moreover, reproducibility of flood was discussed by numerical calculation using one and two-dimensional model and two-dimensional model which considered drag coefficient of vegetation.