Retrospective simulation on the Haihe"23·7"basin-wide extreme flood
To support the decision-making and forecasting work for the catastrophic flood in the Haihe River Basin,the Zijingguan and Manshuihe sub-basins,located in the Daqing River where a catastrophic flood occurred in July 2023,were selected for the flood simulation and prediction with the Xin'anjiang-Haihe model based on measured rainfall and discharge data.For the Zijingguan sub-basin,5 floods from 1996 to 2020 were chosen for the parameter calibration,while for the Manshuihe sub-basin,8 floods from 1953 to 2016 were used.The simulation was validated against the Haihe"23·7"basin-wide extreme flood event.The results showed that the relative errors of peak discharge and flood volume in both sub-basins were within 20％,with a peak timing error of 0 hours.The high accuracy of the hydrological model constructed in this study,along with the good agreement between simulation and measured results,demonstrates its ability to reflect the actual flood process.A comparison between different models revealed that the Xin'anjiang-Haihe model performed better in the Manshuihe sub-basin,which is more affected by human activities,compared to the Zijingguan sub-basin with lesser human influence.
Haihe"23·7"basin-wide extreme floodextreme precipitationflood forecastingXin'anjiang-Haihe modelhydrological model
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