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Study on Urban Rainstorms Design Based on Multivariate Secondary Return Period

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Abstract

With the rapid urbanization, waterlogging losses caused by rainstorm are becoming increasingly severe. In order to reveal the correlations between rainstorm characteristic elements, and make the calculation of rainstorm return period more reasonable and objective, this study established the joint distribution models of rainstorm elements by using copula theory based on the rainfall data in a Chinese megacity, Zhengzhou. Then their combined design values of primary return period (PRP) and secondary return period (SRP) are derived by the maximum probability method and the same frequency method. Finally, the rainstorm pattern was acquired associated with Pilgrim & Cordery method (PC). The results indicate that the calculation of rainstorm return period (RRP) with SRP is more reasonable than PRP. For same RRP, the rainstorm volume (RV) of “Or” return period type is largest, while the “And” return period’s is smallest, and the RVs of Kendall return period and survival Kendall return period are between them. Concerning Kendall return period, the RVs calculated by the maximum probability method and the same frequency method are pretty close, and their relative deviations are from -5.84% to 4.69%. Compared to “Or” return period, the rainstorm patterns of Kendall return period can reduce the magnitude and investment of the stormwater infrastructure. Moreover, the rainfall with designed rainstorm pattern of survival Kendall return period mainly concentrated before the rain peak in contrast with Kendall return period.

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The data is not available for some reason, but the computing code will be available on request from the corresponding author.

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Acknowledgements

We would like to express appreciations to colleagues in the laboratory for their constructive suggestions. Also, we thank the anonymous reviewers and members of the editorial team for their constructive comments.

Funding

This research was funded by the Scientific and Technologic Research Program of Henan Province (grant number 192102310508) and The Open Grants of the State Key Laboratory of Severe Weather (grant number 2021LASW-A15).

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All authors contributed to the study conception and design. Conceptualization: J.P. Zhang; Methodology, Data analysis and Writing-original draft preparation: H. Zhang; Writing-review and editing: H.Y Fang. All authors read and approved the final manuscript.

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Correspondence to Hang Zhang.

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Zhang, J., Zhang, H. & Fang, H. Study on Urban Rainstorms Design Based on Multivariate Secondary Return Period. Water Resour Manage 36, 2293–2307 (2022). https://doi.org/10.1007/s11269-022-03142-z

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  • DOI: https://doi.org/10.1007/s11269-022-03142-z

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