湖泊科学2012，Vol.24Issue(2)：178-184,7.
三峡工程蓄水对洞庭湖水情的影响格局及其作用机制
Pattern of impoundment effects and influencing mechanism of Three Gorges Project on water regime of Lake Dongting
摘要
Abstract
With the operation of Three Gorges Project ( TGP) , water regime of rivers and lakes downstream of the dam changed with the reservoir regulation. The lowering of water level becomes normal after flood season compared with the years before TGP. Here, the water storage of TGP in 2006 was selected as a case to quantitatively investigate the effects of TGP on water regime of Lake Dongting. We applied the coupled hydrodynamic analysis model for the middle Yangtze River to compute the variation of water regime induced by the water storage. During impoundment, the reduction of the water level and discharge are 1. 32 m and 466 m /s, re-spectively, at Chenglingji, the outlet of Lake Dongting. The bottomlands inside the Lake Dongting are exposed ahead of time and the lake area with over 5 inundation days reach to 287 km . Results also indicate that: 1) the impact of TGP on water regime var-ied with locations: east Lake Dongting takes the first place, the east of South Lake Dongting and the north of West Lake Dongting second, and the west of South Lake Dongting and the south of West Lake Dongting third. 2) The bottomlands which strongly affect-ed by the impoundment are mainly located at East Lake Dongting, South Lake Dongting and the both sides of flood ways. 3) Two influencing mechanisms on water regime are identified: one is the increase of the lake discharge induced by the rapid drawdown of the mainstream of the Yangtze River; the other is the reduction of inflow from the Yangtze River via Sankou distributary channels.关键词
三峡工程/蓄水/水情/淹水历时/水动力学模型/洞庭湖Key words
Three Gorges Project/impoundment/water regime/inundation duration/hydrodynamic model/Lake Dongting引用本文复制引用
赖锡军,姜加虎,黄群..三峡工程蓄水对洞庭湖水情的影响格局及其作用机制[J].湖泊科学,2012,24(2):178-184,7.基金项目
国家重点基础研究发展计划项目(2012CB417000)、中国科学院知识创新工程重要方向项目(KZCX1-YW-08-01)和国家自然科学基金项目(41071021)联合资助. （2012CB417000）
