试析荆江四口建闸控制对江湖冲淤的影响

Preliminary analysis on influences of building sluices at Jingjiang four-outlets on scour-sedimentation of river and lake

应用一维悬移质数学模型 ,对三峡工程建成后长江中下游干流和洞庭湖区冲淤变化进行了联合计算 ,在此基础上研究了荆江松滋口和藕池口的建闸调度方案对江湖冲淤和三口分流分沙的影响。结果表明 :建闸控制后 ,三口分流分沙量减少 ;松滋口减幅最大 ;长江干流河道冲淤变化较小 ;松滋口分流道淤积 。

An united calculation on the scour-sedimentation variation of the middle-lower reaches of Yangtze River and the Dongting Lake region after Three Gorges Project (TGP) being completed is performed by a 1-D suspended sediment mathematic model. Based on these study results, the effects of different regulation schemes, in which the sluices of the river entrances at Songzi and Ouchi located in the Jingjiang River reach will be or not be built, on the scour-sedimentation of Yangtze River and Dongting Lake and on the partition of runoff and sediment at the Three Entrances were analysed. The research results show that, after the sluices being built, the amount of diverted water and sediments through Three Outlets will be decreased, among them the decrement at the entrance of Songzi is the greatest; it has a little effect on the scour-sedimentation of the Yangtze River main stem; the diverting channel of Songzi-entrance will be deposited; and the deposited amount of Dongting Lake will be visibly reduced.