裸地斜面域における土壌水の流動解析

Abstract

In this paper, the two-dimensional governed equation of the transient saturated-unsaturatedsubsurface flow is numerically solved by the successive overrelaxation technique on a finite differencescheme for a bare slope of a watershed. On the basis of the numerical solutions, some characteristicsof the subsurface flow in the bare slope are discussed to elucidate the soil moisture movement, therising and falling processes of saturated zone, and hydrographs of groundwater runoff.Moreover, a simplified numerical method is presented to deal with the problems of transienttwo-dimensional subsurface flow. This model takes the modified and extended form of the linkedmodel proposed first by M. F. Pikul et al. [1974]. The solution by the modified linked modelshows good agreement with the result obtained by the numerical analysis of the two-dimensionalequation.