計画高水流量の二変数確率論的研究

Abstract

It is one of the most urgent problem in Japan to prevent and decrease the damagesresulting from disastrous floods. To achieve this end, the reasonable programs of flood-protection must be established, as well as the phenomena of flood runoff must be studiedscientifically. This paper describes the availability of two-dimensional probability indetermining the design flood and the several computational examples. That is, theestimations of probability of flood flows in the cases where a river system iscomposed by two tributaries and one main stream channel and where a reservoir forflood control exists upstreains in a river are discussed. In the former, the flood flowsin both tributaries are taken as two variables to determine the probability of the floodflows in these tributaries and the resulting one in a main stream channel and, in thelatter, the peak discharge and the duration time of inflowing flood flow to a reservoiras two variables to determine the probability in estimating the resultant effect of floodcontrol. The computational examples for the Yodo River show that this approach isuseful in these problems.