移流分散方程式の数値解析

Abstract

In this study, the dispersive behaviours of a solution injected at the upper boundary in formsof a square wave in natural streams are studied by means of numercal and analytical methods.In uniform flow, the response functions for the square wave are classified into three types bythe Peclet Number and the dimensionless duration time of a square wave, and the each responsefunction is also characterized by the Peclet Number and the dimensionless duration time by meansof the analytical method.Through comparison of the both results of the numerical analysis in natural streams and theanalytical model, it is verified that the dispersive characteristics of natural streams can be expressedby the use of classification methods in uniform flow.