由良川の出水特性に関する研究

Abstract

Many studies on the rainfall and runoff relation have been hitherto made in the field ofapplied and engineering hydrology. However, these studies which mainly depended on muchhydrologic data and neglected the consideration of inter-mechanism in runoff process wereinsufficient to plan the reasonable river projects, because there are a few hydrologic datafor most of rivers in Japan.In this paper, firstly it is pointed out that three different regions appear in rainfall-runoff process, both in time and area. The runoff mechanism of those regions and theirtransition are disclosed systematically from the stand point of universal concept.On the basis of these fundamental results, the following items are developed and presented.(1) A new method of runoff analysis in which only a few data are needed. (2) An approachof evaluation of runoff characteristics of an uninvestigated river basin from that of the adjacentone. (3) An engineering technique of quick forcasting of the peak discharge at severaldownstream points from the observated or estimated hydrograph at an upstream point duringa flood.These methods are applied to the analysis of flood runoff in the Yura River basin withgood agreement.