Simulation Study of Typical Flash Floods based on Radar-Estimated Rainfall and WRF-Hydro Model

Yingchun HU; Yaodeng CHEN; Yufang GAO; Tao PENG

doi:10.7522/j.issn.1000-0534.2023.00044

Gaoyuan qixiang (Feb 2024)

Simulation Study of Typical Flash Floods based on Radar-Estimated Rainfall and WRF-Hydro Model

Yingchun HU,
Yaodeng CHEN,
Yufang GAO,
Tao PENG

Affiliations

Yingchun HU: Key Laboratory of Meteorological Disaster of Ministry of Education /Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/School of Applied Meteorology， Nanjing University of Information Science & Technology， Nanjing 210044， Jiangsu， China
Yaodeng CHEN: Key Laboratory of Meteorological Disaster of Ministry of Education /Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/School of Applied Meteorology， Nanjing University of Information Science & Technology， Nanjing 210044， Jiangsu， China
Yufang GAO: Key Laboratory of Meteorological Disaster of Ministry of Education /Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/School of Applied Meteorology， Nanjing University of Information Science & Technology， Nanjing 210044， Jiangsu， China
Tao PENG: China Meteorological Administration Basin Heavy Rainfall Key Laboratory/Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research， Institute of Heavy Rain， China Meteorological Administration， Wuhan 430205， Hubei， China

DOI: https://doi.org/10.7522/j.issn.1000-0534.2023.00044
Journal volume & issue: Vol. 43, no. 1
pp. 254 – 263

Abstract

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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.

Published in Gaoyuan qixiang

ISSN: 1000-0534 (Print)
Publisher: Science Press, PR China
Country of publisher: China
LCC subjects: Science: Physics: Meteorology. Climatology
Website: http://www.gyqx.ac.cn/EN/home

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