A STUDY ON THE IMPROVEMENT OF THE APPLICABILITY OF THE DISTRIBUTED RIVER SIMULATION MODEL

Abstract

There are several commercial river water simulation models, with the progress of mathematical techniques for hydraulic calculation in open channel and pipeline. As a result, it is getting easier for engineers to model a river basin as a distributed model. But the problems are still left in application, such as, which is suitable for rainfall-runoff model for sub-basins, how to determine parameters with insufficient data, the lack of detailed cross sections of river beds and so on.
With a view to promote the applicability of the distributed model, the authors applied it to the Japanese mountainous river basin for continuous simulation including dry weather condition. The countermeasure for above problems are the application of SCS method for surface runoff model, the adoption of new interflow model, the conversion of hourly rainfall data into 5 minutes intervals, and the presumed triangular river cross sections and falling works. Based on these assumptions, the simulation results fairly agreed with the observed data. It means basic concept of this study is in the right way and applicable to any other basins.