Author(s): Fangrui Dong; Tao Sun; Wenjing Lu; Xiaoxiang Zhang; Xuejun Yang; Qiang Ma

Linked Author(s):

Keywords: “23∙7” catastrophic flood; Digital twin watershed; Distributed hydrological model; Hydraulic simulation

Abstract: Affected by the global climate change, the challenges to flood management on catchment scale has increased. However, digital twin watershed is found effectively to improve its flood control capacity. In this study, taking the “23∙7” big flood happened in Ziya River Basin, a digital twin flood modelling strategy has been presented with integration of hydrological and hydraulic models developed in China. The distributed hydrological models covered full catchment above Xianxian hydrojunction and three high resolution 2D hydraulic models over three flood storage areas has been set up and integrated into a modelling platform. The simulation results of 26 gauging stations shows higher accuracy with 7% difference of flood peak and averaged NSE 0.7. From this modelling assessment, the upper and middle parts of the Ziya River Basin showed an obvious Horton and Dunne mixed runoff generation mechanism during the whole flood period. Scientifically optimized the outflow of large reservoirs such as Huangbizhuang reservoir, the flooded area in Xianxian flood storage area has been reduced 68%. The modelling strategy proposed in this study is clear and operational for guiding the implement of digital twin watershed in other places and the models set up following the strategy shows high performance and efficiency.

DOI: https://doi.org/10.3850/iahr-hic2483430201-262

Year: 2024