STUDY OF HYDROLOGICAL MODEL CONCERNING LAND USE PLAN AND ITS APPLICATION TO AN URBAN BASIN IN THE TAMA HILLS

Abstract

 This study carried out the hydrological analysis for an urban basin in the Tama hills considering infiltration capacity of various land use, targeting on the land use plan for “River Basin Disaster Resilience and Sustainability by All”. The hydrological model for mountainous basins developed by Fujimura is improved for this study. The results were obtained from the long-term runoff analysis for 22 years and flood runoff analysis for 10 events. The improved hydrological model approximately reproduced the flow duration curve for 22 years and 10 flood hydrographs, using the relative error and Nash-Sutcliffe coefficient. We showed the reliability of the improved hydrological model for urban basins based on the results of both long-term and short-term hydrological accuracy.