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Hydrometeorological-modeling-based analysis and risk assessment of a torrential rainfall flash flood in a data deficient area in Wenchuan County, Sichuan Province, China

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Abstract

The objective of this study is to simulate the rainfall-runoff process of mountain torrents in the Shou River Basin located in the southern part of Wenchuan County, Sichuan Province. The basin encountered a significant flood disaster on August 20, 2019, resulting in substantial human and economic losses, as well as limited hydrological data availability. This research employs a unidirectional coupling approach by integrating the Weather Research and Forecasting Model (WRF) with the Storm Water Management Model (SWMM) to accurately simulate rainfall-runoff processes. To account for the non-uniform distribution of precipitation within mountainous watersheds, high-precision rainfall data generated by WRF are extracted and utilized as input for the SWMM model. The quantitative comparison between the evolution of spatial distribution of rainstorms and hourly precipitation processes demonstrates that the WRF model effectively captures dynamic changes in rainstorms. Analysis results indicate a trend of rainfall center movement from midstream to downstream, with sub-watersheds' superimposed effect on rainfall response leading to increased flood peak response, duration, and destructive power. This study provides an effective method and reference for predicting and assessing mountain flood disasters in data-scarce areas such as the Shou River Basin.

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Acknowledgements

This research was supported by National Natural Science Foundation of China (52239006, 51639007).

Funding

This research was supported by the China Institute of Water Resources and Hydropower Research and the National Natural Science Foundation of China (52239006, 51639007).

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by EZJ, YGW and ZXX. The first draft of the manuscript was written by EZJ, and XFY and XKW revised-the paper. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xie-Kang Wang.

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Jin, EZ., Wang, YG., Xu, ZX. et al. Hydrometeorological-modeling-based analysis and risk assessment of a torrential rainfall flash flood in a data deficient area in Wenchuan County, Sichuan Province, China. Stoch Environ Res Risk Assess 38, 33–50 (2024). https://doi.org/10.1007/s00477-023-02553-7

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  • DOI: https://doi.org/10.1007/s00477-023-02553-7

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