水利工程和降水波动对洞庭湖水沙过程的定量分析

发布时间：2018-06-07 11:45

本文选题：水利工程 + 降水波动　；参考：《水电能源科学》2017年07期

【摘要】：为进一步分析洞庭湖水沙变化特征及主要影响因素,采用Mann-Kendall突变检测和滑动T检验方法,并结合洞庭湖水沙变化的阶段性特征,划分出基准期和变异期,通过双累积曲线法定量分析水利工程与降水波动对水沙变化的贡献率。结果表明,洞庭湖的水沙均呈减少趋势,水利工程是影响水沙变化的最主要因素;洞庭湖径流量在1977年发生突变,而输沙量在1980年发生突变;以1960~1966年为基准期,1967~1973、1974~1980、1981~2014年为变异期,对入湖年径流量变化影响,降水量贡献率分别为11.28%、6.83%、0.84%,水利工程贡献率分别为88.72%、93.17%、99.16%;而对入湖年输沙量变化影响,降水量贡献率分别为7.30%、12.49%、0.46%,水利工程贡献率分别为92.70%、87.51%、99.54%。四水流域与荆江三口流域的水利工程项目的运行均是入湖径流量变化的主要影响因素,荆江三口流域的水利工程运行是导致入湖输沙量变化的主要原因。
[Abstract]:In order to further analyze the variation characteristics of water and sediment in Dongting Lake and its main influencing factors, Mann-Kendall mutation detection and sliding T test were used to divide the reference period and variation period according to the stage characteristics of water and sediment change in Dongting Lake. The contribution rate of water conservancy engineering and precipitation fluctuation to the change of water and sediment is quantitatively analyzed by double cumulative curve method. The results show that the water and sediment of Dongting Lake are decreasing, and water conservancy project is the most important factor affecting the change of water and sediment, the runoff of Dongting Lake changed suddenly in 1977, and the sediment discharge changed in 1980, and the variation period was from 1967-19731974 to 1981-2014. The contribution rate of precipitation is 11.280.83%, and the contribution rate of water conservancy project is 88.72n93.170.16, respectively, and the contribution rate of precipitation is 7.300.499.490.46, and the contribution rate of hydraulic engineering is 92.70m 87.51am 99.544.The contribution rate of precipitation is 11.28830.84, and the contribution rate of water conservancy project is 88.72n93.179.99.160.The contribution rate of precipitation is 7.30n12.490.46, and the contribution rate of hydraulic engineering is 92.7077.51g. The operation of water conservancy projects in Sishui basin and Sankou basin of Jingjiang River is the main influencing factor for the change of runoff into the lake, and the operation of water conservancy project in Sankou basin of Jingjiang River is the main reason leading to the change of sediment discharge into the lake.
【作者单位】：六盘水师范学院;湖南师范大学资源与环境科学学院;
【基金】：贵州省科学技术基金项目(黔科合LH字[2015]7632号);贵州省科学技术基金项目(黔科合LH字[2014]7451号) 贵州省教育厅自然科学研究项目(黔教合KY字[2015]445号)
【分类号】：P333

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