荆江三口入洞庭湖水沙演变及成因分析  

Runoff and Sediment Discharge into Dongting Lake from Three Channels,Jingjiang River

作　　者：谢永宏[1,2] 李峰[1,2] 陈心胜[1,2] 侯志勇[1,2] 

机构地区：[1]中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,湖南长沙410125 [2]中国科学院亚热带农业生态研究所洞庭湖湿地生态系统观测研究站,湖南岳阳414018

出　　处：《农业现代化研究》2012年第2期203-206,共4页Research of Agricultural Modernization

基　　金：国家重大基础研究计划(编号:2012CB417005);中国科学院知识创新工程项目(编号:KZCX2-YW-435);国家自然科学基金项目(编号:31070325)

摘　　要：以荆江枝城和三口入洞庭湖的代表性控制站1956-2008年长系列水文数据为基础,运用Mann-Kendall趋势突变检验等方法,探讨三口水沙演变过程并分析了其成因。结果表明:枝城年径流量2003年后有所偏低,可能与长江上游降水量偏低有关,但无显著性变化。枝城年径流量、三口年径流量和年输沙量总体上呈显著下降趋势,发生突变的时间分别为2003年,1979年和1989年。三口年径流量只有1973年一个转折点,但年输沙量有1973年和2003年两个转折点。1973年的转折点主要是荆江裁弯导致径流量下降引起的,而2003年的转折点主要是三峡水库蓄水运行后导致悬浮泥沙浓度下降引起的。Based on hydrological data from 1956-2008 of representative gauging stations, the evolution processes and its reason of annual runoff and sediment discharge in Zhicheng and Three Channels were investigated, using Mann-Kendall trend test and other analyses. The results showed that annual runoff of Zhicheng was relatively lower after 2003, which might be related to lower precipitation in the upper reaches of Yangtze River. However, this change was insignificant. Annual runoff in Zhicheng, annual rtmoff and sediment discharge in Three Channels, as a whole, were significantly decreasing tendency, and the abrupt time was 2003, 1979 and 1989, respectively. Annual runoff in Three Channels only had a turning point in 1973, while annual sediment discharge had two turning points in 1973 and 2003, respectively. Turning point in 1973 was primarily caused through decreased runoff by the cutoff in Jingjiang River, and the turning point in 2003 was mainly caused through decreased suspended sediment concentration by the running of Three George Reservior.

关 键 词：荆江三口 突变 水文过程 水利工程 

分 类 号：S271[农业科学—农业水土工程]