河川堤防破堤時の水流に関する実験的研究

Abstract

When a river dike breaks down, the flowing water of higher level in a stream channel runs outabruptly from the part of breaking. The motion of water which runs out in an inland area hasbeen studied by hydraulic experiments or by numerical calculations of difference equations. How-ever, hydraulic behavior of the flowing water in a stream channel, control position of the wholeflow pattern and so on after dike breaking are remained unsolved.This paper describes the results obtained after hydraulic experiments on the motion of waterdue to breaking of a river dike. It is one of the available results obtained that, after several secondsfrom breaking, the discharge rate of outflow from the broken dike is proportional to 3/2 power ofthe initial depth of water and remains constant.