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Flood hydrograph coincidence analysis of the upper Yangtze River and Dongting Lake, China

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Abstract

In hydrological research, flood events can be analyzed by flood hydrograph coincidence. The duration of the flood hydrograph is a key variable to calculate the flood hydrograph coincidence risk probability and determining whether flood hydrograph coincidence occurs, while the actual duration of the flood hydrograph is neglected in most of existing related research. This paper creatively proposes a novel method to analyze the flood hydrograph coincidence risk probability by establishing a five-dimensional joint distribution of flood volumes, durations and interval time for two hydrologic stations. More specifically, taking the annual maximum flood of the upper Yangtze River and input from Dongting Lake as an example, the Pearson Type III and the mixed von Mises distributions were used to establish the marginal distribution of flood volumes, flood duration and interval time. Subsequently, the five-dimensional joint distribution based on vine copula was established to analyze the flood hydrograph coincidence risk probability. The results were verified by comparison with a historical flood sequence, which show that during 1951–2002, the hydrograph coincidence probabilities corresponding to its flood event coincidence volumes of 2.00 × 1011 m3, 4.00 × 1011 m3, and 6.00 × 1011 m3 are 0.213, 0.123, and 0.049, respectively. It has provided theoretical support for flood control safety and risk management in the middle and lower Yangtze River. This study also demonstrates the significant beneficial role of regulation by the Three Gorges Water Conservancy Project in mitigating flood risk of the Yangtze River. The hydrograph coincidence probability corresponding to its flood event coincidence volume of 2.00 × 1011 m3 has decreased by 0.141.

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Availability of data and material

The data that support the findings of this study are openly available in the Changjiang Water Resources Commission of The Ministry of Water Resources of China at http://www.cjw.gov.cn/.

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Acknowledgements

The study was financially supported by the Guangdong Foundation for Program of Science and Technology Research (2020B1111530001, 2019QN01L682), the GDAS Special Project of Science and Technology Development (2020GDASYL-20200102013, 2020GDASYL-20200301003). We thank LetPub (www.letpub.com) for its linguistic assistance and scientific consultation during the preparation of this manuscript.

Funding

The study was financially supported by the Guangdong Foundation for Program of Science and Technology Research (2020B1111530001, 2019QN01L682) and the GDAS Special Project of Science and Technology Development (2020GDASYL-20200102013, 2020GDASYL-20200301003).

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Contributions

All authors contributed to the study conception and design. Data collection and analysis were performed by CJ and YW. The first draft of the manuscript was written by CZ, and the figures and tables were made by QX. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yi Wang.

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The authors have no relevant financial or non-financial interests to disclose. The authors have no conflicts of interest to declare that are relevant to the content of this article. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. The authors have no financial or proprietary interests in any material discussed in this article.

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Zhang, C., Ji, C., Wang, Y. et al. Flood hydrograph coincidence analysis of the upper Yangtze River and Dongting Lake, China. Nat Hazards 110, 1339–1360 (2022). https://doi.org/10.1007/s11069-021-04993-2

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  • DOI: https://doi.org/10.1007/s11069-021-04993-2

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