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Flood modeling developed for digital twin watershed: A case study of
“23·7” great flood assessment in Ziya River Basin
1 1 1 2 3 1
MA Qiang , LI Zhengmiao , DONG Fangrui , ZHANG Kejian , YANG Bang , LIU Changjun
(1. China Institute of Water Resources and Hydropower Research, Beijing 100038, China;
2. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;
3. Hydrology Bureau of Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China)
Abstract: According to the large catchment characterized with complex runoff generation and confluence mecha⁃
nisms and strongly affected by serious human activities, the key point to successfully set up the digital twin platform
is how to select the most suitable approach to simulate the hydrological and hydraulic processes. In this study, tak⁃
ing the “23·7” great flood happened in Ziya River Basin, a digital twin flood modelling has been built with inte⁃
gration of hydrological and hydraulic models developed in China. In order to reach the objectives for clearly under⁃
standing the causes and sources of the flood flow and quantitatively evaluating the performances of hydraulic con⁃
structions, the distributed hydrological models covered full catchment above Xianxian hydro-junction 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 opti⁃
mized the outflow of large reservoirs such as Zhuzhuang and Huangbizhuang reservoirs, the flooded area in Xianxian
flood storage area has been reduced 77%. The technical route of river basin digital twin flood modelling developed
in this study is clear and feasible, which can be used as reference for guiding the implement of digital twin water⁃
shed to other places in the future.
Keywords: “23·7” catastrophic flood; digital twin watershed; distributed hydrological model; hydraulic simulation
(责任编辑: 耿庆斋)
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