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洞庭湖流域水系汛期分期研究
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Abstract:
汛期分期是推求分期设计洪水和分期汛限水位的基础。本文综合运用天气成因分析和5种数理统计方法对洞庭湖流域的湘江、资江、沅江和澧水水系进行了汛期分期。研究结果表明：洞庭湖流域汛期(5月1日~10月31日)可划分为前汛期、主汛期和后汛期。湘江、资江、沅江、澧水的主汛期分别为6月15日~7月23日、6月14日~7月28日、6月20日~8月2日、6月22日~8月9日。汛期分期可合理表征流域洪水季节性特征，为充分挖掘流域洪水资源化潜力提供支撑。
Flood season segmentation is the basis for estimating seasonal design flood and seasonal flood limit water levels. The cause analysis method and five mathematical statistics methods were applied to the flood season segmentation of Xiangjiang, Zijiang, Yuanjiang and Lishui rivers in the Dongting Lake basin. The results illustrated that the flood season (1 May~31 October)could be segmented into the early flood season, the main flood season and the late flood season. The main flood seasons of Xiangjiang, Zijiang, Yuan- jiang and Lishui rivers are 15 June~23 July, 14 June~28 July, 20 June~2 August and 22 June~9 August, respectively. These results are reasonably characterized the flood seasonality and could provide support for exploiting the potential of flood water resources utilizing.
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