Research and application of dynamic rainfall threshold based on China Flash Flood Hydrological Model
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Abstract:
Flash flood warning at catchment scale was determined by dynamic rainfall threshold using China Flash Flood Hydrological Model (CNFF),considering antecedent soil moistures,accumulated rainfall depths,rainfall intensities,rainfall temporal patterns,and topographies.Three typical catchments of different hydrological characteristics were selected in the Sichuan province as study area to assess the accuracy of CNFF for early warning flash floods.Results show that:（1） CNFF was suitable for flash flood simulation in the study area,and the qualifying ratios were over 90% in the selected catchments;（2）With rainfall durations of 1 h,3 h,and 6h,the critical rainfall thresholds were obtained as 20~250 mm,12~160 mm,6~140 mm for Ganchang catchment,Xining catchment,and Xinsheng catchment,respectively;（3）The qualifying ratios for flash flood warning were over 80% under different rainfall durations for all catchments.This study may provide technical support for early warning flash floods at catchment scales.
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