ABSTRACT
Fu River is one of the five biggest rivers flowing into the Poyang Lake – the largest freshwater lake in China. The tail region of Fu River is an important part of Poyang Lake Ecological Economic Zone, which is playing an important role in Jiangxi’s economic construction. In recent years, this region has been in urgent need to improve the flood control capacity with the development of the local social economic. A bend cut at the tail is an effective way to reduce the flood level of this region. After the bend cut, the Fu River will indirectly flow into the Poyang Lake by its son lake, called as Qinglan Lake. As a result, the sediment deposition will become an unavoidable problem at the Qinglan Lake. It will bring the shrinking of the Qinglan Lake, which is match with the conception of ecological development. In this paper, a 2D numerical dynamics model of water and sediment at Fu River tail was established to simulate the flood level and rive-lake bed evolution after the bend cut. The analysis based on the model results shows an obvious trend of deposition in the Qinglan Lake, contrarily at upper reaches of the bend cut. This will give a technical support to for the choice of the bend cut at Fu River tail, as well as in the other river tail flowing into Poyang Lake.
