Kinematic Wave 法への集水効果の導入

Abstract

A basic objective of this study is to consider the interaction between the surface flowand subsurface flow in mountanous watersheds having curved surfaces covered with A-layers with uniform thickness. This objective is accomplished by incorporating the functionwhich represents the feature of the watershed surface geometry, which is called the geo-metric pattern function in this study, into the basic equations of the kinematic wave modeland by using the flow-depth relation equation in the field covered with an A-layer. Whenthe watershed surface is linearly diverging or converging, its geometric pattern functionhas linear form, and the numerical simulations only in such a case are given here.If the meaning of the geometric pattern function is extended, that is, if the geometricpattern function is regarded as a new parameter of the kinematic wave model, however, the kinematic wave model with a geometric pattern function becomes very flexible one. Infact, when the lateral inflow is spatially uniform, this model may be used as a simple modelof a stream network system. To show this fact is another objective of this study.