低平地帯の雨水流出モデルに関する基礎的研究 ―ポンプ排水地域を対象として―

Abstract

This paper deals with the possibility of simplification of runoff model in a low-lying drainagebasin composed mainly of paddy fields. First, the method of numerical calculation of unsteadyflow at a junction of channels and the effect of the weir length of a pond on hydrographs at theoutlet of channel networks are discussed. Next, the possibility of simplification of complicatedchannel networks model is examined for the case that the boundary condition at the outlet of thenetworks is given by discharge assuming the pump drainage system. As the result, it has beendisclosed that a complicated channel networks can be simplified to the second order channel system.