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Runoff Prediction Under Extreme Precipitation and Corresponding Meteorological Conditions

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Abstract

In order to more reasonably predict runoff under extreme precipitation and corresponding meteorological conditions, and explore the influences of annual precipitation and extreme precipitation on the runoff process, this paper proposes an improved precipitation stochastic simulation model and combine it with Weather Generator based on Dry and Wet Spells (WGDWS) and Soil and Water Assessment Tool (SWAT) model. Taking a typical mountainous basin in North China, the basin above the Wangkuai Reservoir, as the study area, the daily precipitation process and corresponding meteorological data for six extreme precipitation scenarios are generated as inputs of the SWAT model to predict monthly runoff. The results reveal that the annual runoff under the six scenarios is 5.41 m3/s, 5.95 m3/s, 6.57 m3/s, 7.02 m3/s, 7.74 m3/s and 8.04 m3/s, with maximum monthly runoff of 18.10 m3/s, 21.71 m3/s, 21.94 m3/s, 32.69 m3/s, 34.33 m3/s, 43.72 m3/s, respectively. For the same annual precipitation, the extreme precipitation magnitude has a significant effect on annual runoff, but this impact weakens as annual precipitation increases, and the influence on monthly runoff is reflected mainly in August. Moreover, under the same extreme precipitation conditions, the annual runoff increases by approximately 10% if the annual precipitation increases by 100 mm, and the influence on monthly runoff is reflected only in July. The coupling of the improved precipitation stochastic simulation, WGDWS and SWAT model not only presents a technical reference for water conservancy project operation management and water resource management under extreme precipitation scenarios, but also provides a new idea for predicting runoff under extreme precipitation and corresponding meteorological conditions.

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Data Availability

The data generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the Natural Sciences Foundation of Henan Province (Grant No. 212300410404), the National Key R&D Program of China (Grant No. 2021YFC3200205).

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Contributions

All authors contributed to the study conception and design. JZ: Conceptualization, Methodology. DW: Methodology, Writing – original draft. YW: Software, Supervision, Validation, Writing – review & editing. HX: Software, Data curation. MZ: Writing – review & editing, Data curation. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yuhao Wang.

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Zhang, J., Wang, D., Wang, Y. et al. Runoff Prediction Under Extreme Precipitation and Corresponding Meteorological Conditions. Water Resour Manage 37, 3377–3394 (2023). https://doi.org/10.1007/s11269-023-03506-z

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  • DOI: https://doi.org/10.1007/s11269-023-03506-z

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