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Interannual Variabilities in the Onset and Demise of Rainy Season: Implications for Water Management

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  • Yuannan Long

    (Changsha University of Science & Technology
    Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province
    Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province)

  • Moruo Zheng

    (Changsha University of Science & Technology)

  • Huaiguang He

    (Hunan Institute of Water Resources and Hydropower Research)

  • Shixiong Yan

    (Changsha University of Science & Technology)

Abstract

This study examines potential changes in the summer rainy season of a watershed, using a cumulative rainy deficit curve to define the onset and demise of the rainy season. Historical daily rainfall data from 41 gauge stations within the Xiang River Basin in 1960–2017 were analyzed. Results indicate that the climatology of the onset date is Julian day 72 and the climatology of the demise date is Julian day 236. There is, however, a difference between the two segments, e.g., 1960–1989 and 1990–2017. The median rainy season duration in 1990–2017 is 138 days. This is larger than that of 1960–1989, which is 120 days. There is a statistically significant correlation between the onset date of the rainy season and the duration of the rainy season. Daily soil moisture estimates were derived from satellite remote sensing data. The averaged soil moisture during the rainy season is much higher than that of the non-rainy season. To examine the difference in quick flow between rainy and non-rainy season, baseflow separation was applied to daily streamflow time series. Result reveals the median of weekly quick flow in rainy season is 1316 cms, which is 5.7 times that of the weekly quick flow in non-rainy season. Different mechanisms that drive spring and summer rainfall, as well as potential use of the results in water management, are discussed.

Suggested Citation

  • Yuannan Long & Moruo Zheng & Huaiguang He & Shixiong Yan, 2023. "Interannual Variabilities in the Onset and Demise of Rainy Season: Implications for Water Management," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(12), pages 4933-4948, September.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:12:d:10.1007_s11269-023-03589-8
    DOI: 10.1007/s11269-023-03589-8
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    References listed on IDEAS

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    1. Shifeng Huang & Jinggang Li & Mei Xu, 2012. "Water surface variations monitoring and flood hazard analysis in Dongting Lake area using long-term Terra/MODIS data time series," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 62(1), pages 93-100, May.
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