水土保持学报2011，Vol.25Issue(3)：215-219,5.
长江三峡水库蓄水运用对洞庭湖水沙特性的影响
Effects of Store Water Application of the Three-Gorges Reservoir on Yangtze River on Water and Sediment Characteristics in the Dongting Lake
摘要
Abstract
According to the measured water and sediment data, using comparative analysis, the paper analyzed systematically the effects of store water application of the Three-Gorges reservoir on Yangtze river on water and sediment characteristics in the Dongting lake. The results indicated that: (1) The ratios of splitflow and sediment diversion at the three outfalls of Jingjiang river reduced separately from 18.5％ ,21.4％ to 11.7％ and 13.6％ ,which resulted in that the proportions of runoff and sediment discharge via the three outfalls into Dongting lake compared total runoff and total sediment discharge reduced respectively from 41.5 ％,82.9％ to 21.6 ％, 58. 5 ％;(2)Average annual water and sediment volume into the Dongting lake decreased respectively 531 ×l08 m3 ,4 715 × 104 t, sediment deposition rate in the lake basin reduced from 70.4％ to 39.5％ with a decreased range of 30.9％; (3)Average annual water level amplitude in the west,south and east of the Dongting lake decreased respectively 1.23 m, 1.45 m and 1.88 m; (4)Sluicing capacity was greater than sediment deposition in the lake basin, deposited sand grain trends to thinning, sediment output ratios in the west and southeast of the Dongting lake present all synchronous increasing trend. The variations of water and sediment characteristics were of great significance towards prolonging the lifetime of the Dongting lake and easing the flood dangers as well as they brought about a series of eco-environment problems in the lake area.关键词
三峡水库/蓄水/水沙特性/洞庭湖Key words
the Three-Gorges reservoir/ store water/ water and sediment characteristics/ the Dongting lake分类
农业科技引用本文复制引用
李景保,代勇,欧朝敏,彭鹏,邓楚雄..长江三峡水库蓄水运用对洞庭湖水沙特性的影响[J].水土保持学报,2011,25(3):215-219,5.基金项目
国家自然科学基金(41071067) （41071067）
湖南省重点学科自然地理学建设项目 （）
