IDENTIFICATION OF THE TANK MODEL PARAMETERS BY DISCHARGE HYDROGRAPHS OF A MAIN RIVER AND TRIBUTARIES OBTAINED FROM TIME SERIES OF OBSERVED WATER SURFACE PROFILES AND FLOOD FORECASTING USING IT

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  • 観測水面形時系列から求めた本・支川の流量ハイドログラフを用いたタンクモデルの定数同定と洪水予測計算

Abstract

<p> The accurate flood forecasting technique is required to provide information of flood evacuations for residents in an inundation area. The run-off analysis in the flood forecast technique is usually verified by rating curves of rivers in general. But the rating curves can not accurately estimate discharge hydrograph in rivers where effects of flood storage and bed variations are large on flood flows. And the runoff from the small basins is not sufficiently verified. In the present study, the flood flow and bed variation analysis using observed water surface profiles provides accurate discharge hydrographs of the Hii River and the tributaries of 2013 flood. And parameters of the tank model are identified by using those discharge hydrographs. The flood forecasting technique using the verified tank model accurately predicts the time series of water surface profiles and discharge hydrographs of the 2011 floods in the downstream of the river.</p>

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