关键词: 分段马斯京根法, 参数率定, 水量平衡, 嫩江

Abstract: In the light of the imbalance flood routing problem of Jiangqiao- Dalai reach of Nenjiang River, firstly, we analyzed the runoff variation characteristic of Jiangqiao and Dalai hydrological station before and after 1998, a big flood year; secondly, we introduced the channel flood routing loss coefficient and established the flood routing model of Jiangqiao-Dalai reach based on the segmented Muskingum method. Lastly, based on the flood data after 1998 we calibrated channel flood routing parameters and flood loss coefficient by using particle swarm optimization algorithm and analyzed the rationality of parameters and loss coefficient. The results show that due to the souring and destroying of the flood in 1998, the flood spreads quicker in Jiangqiao - Dalai reach, at the same time, the flood overflows the river in the evolution process, causing water imbalance. The results indicate that the flood loss coefficient is feasible and can improve the flood simulation accuracy.

Key words: Segmented Muskingum method, parameter calibration, water balance, Nenjiang River