三峡工程运用前后藕池口分流分沙变化规律分析

Analysis on runoff and sediment diversion of Ouchikou before and after impounding of the Three Gorges reservoir

根据三峡工程运用前后的实测水文资料,分析了藕池口分流分沙的年际、年内变化规律及其成因,并研究了三峡工程蓄水以来藕池口口门附近河段河势变化特点及其对分流分沙格局的影响。研究表明:影响藕池口分流分沙最直接的两个因素是口门附近水位和口门高程;三峡工程运用后藕池口年内分流和分沙量更集中在6—9月,10月的分流分沙量明显减少,但年分流分沙比变化不大;预计未来一段时间内藕池口分流分沙比将基本变化不大。

According to the hydrological data measured before and after the impounding of the Three Gorg- es Reservoir, the intra-and inter-annual variation rules of runoff and sediment diversion of Ouchikou were analyzed. In addition, the new characteristics of river regime change in Ouchikou and its impacts on runoff and sediment diversion were also explored in this paper. Results show that the direct factors on runoff and sediment diversion are the riverbed elevation of Ouchikou and the Changjiang water level nearby. After the operation of the three Gorges reservoir,the intra-annual distribution of runoff and sediment diversion will be more concentrated from June to September with less in October, however, the annual ratio of runoff and sediment diversion will change little. It can be predicted that the runoff and sediment diversion remains stable in the coming period.