Impact of Water Diversion of the South-to-North Water Diversion Middle Route Project on the Hydrological Characteristics at the Junction of Yangtze River and Poyang Lake

Abstract

To research change rule of relationship between Poyang Lake and Yangtze River under the influence of water diversion of Middle Route Project ({''}MRP{''}) Phase I of the South-to-North Water Diversion Project ({''}SNWDP{''}), this paper use an entry point that hydrological characteristic changes of the inflow water of main stream of Yangtze River, takes the minimum abandoned water as the objective function and establishes an optimal dispatching model base on the structure ``water diversion - adjustment capacity{''}. The influence of water diversion of SNWDP on the hydrological characteristics at the junction of the Yangtze River and Poyang Lake are comparatively analyzed. The results show that the annual water diversion quantity of South-to-North Water Diversion Project has very little impact on the annual runoff, runoff in dry season and minimum monthly runoff of the downstream Jiujiang hydrological station after the regulating of Danjiangkou, which are without obvious influence on the downstream river-lake relation.