ON THE DISCHARGE ESTIMATION METHOD OF FLOOD FLOWS IN MOUNTAIN STREAMS BASED ON MULTIPLE-WATER LEVELS OBSERVATION DATA

Abstract

 Estimating discharge hydrograph in mountain streams is important for analyzing propagation mechanism of flood flow to the downstream rivers. We observed water levels at many points in mountain streams. In addition, we performed estimation of the accurate discharge hydrographs by using flood flow analysis based on time series of water surface profiles. River morphology data used by flood flow analysis was carefully determined by survey date, aero photographs and topographic maps. As a result, we confirmed that flood flow analysis based on observed water surface profiles was valid for estimating discharge hydrograph in mountain streams. Finally, we considered appropriate flood observation systems and discussed points of attention for the observation systems in mountain streams.