Simulation Study of Typical Flash Floods based on Radar-Estimated Rainfall and WRF-Hydro Model
Received date: 2022-09-20
Revised date: 2023-05-15
Online published: 2024-01-11
Limitations of complex topography and lack of basic meteorological and hydrological information make the hydrological early warning and forecasting technology in small-scale mountainous watersheds weak.Using high-resolution radar observations to drive distributed hydrological models is one of the effective ways to improve the flood forecasting capabilities in small mountainous watersheds.Focusing on the Erhe river basin located in central Chongqing as the study area, a study of WRF-Hydro model flash flood simulation based on radar-estimated rainfall data is carried out to evaluate the hydrological application effect of radar-estimated rainfall and the applicability of WRF-Hydro model in small mountainous watersheds.The typical storm flood process in the watershed was selected, and the WRF-Hydro model was driven by the estimated rainfall data from S-band Doppler weather radar, and further compared with the XAJ model to analyze the simulation effects.The results show that: (1) the WRF-Hydro model driven by radar-estimated rainfall data provides a better simulation of the flood process, flood flow and peak-to-peak time in the Second River Basin, with the Nash efficiency coefficient above 0.65, the Kling-Gupta efficiency coefficient above 0.50 and the correlation coefficient above 0.85.(2) Comparing the WRF-Hydro model with the XAJ model, the simulation effectiveness of the WRF-Hydro model is superior to that of the XAJ model in the Erhe River basin, with a difference of 0.03 in the Nash coefficient and 0.04 in the correlation coefficient, further indicating the superior flood simulation performance of the WRF-Hydro model in small mountainous basins.Overall, the WRF-Hydro model based on radar-estimated rainfall data exhibited satisfactory flood simulation performance in the Erhe basin, and can be further applied in similar small-scale mountainous basins.
Yingchun HU , Yaodeng CHEN , Yufang GAO , Tao PENG . Simulation Study of Typical Flash Floods based on Radar-Estimated Rainfall and WRF-Hydro Model[J]. Plateau Meteorology, 2024 , 43(1) : 254 -263 . DOI: 10.7522/j.issn.1000-0534.2023.00044
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