洞庭湖河湖疏浚对洪水位影响分析

Analysis on the Effect of Lake Dongting Dredging on Flood Elevation

洞庭湖是长江中游的重要调蓄湖泊,但由于接纳湘江、资水、玩江、澧水四水和长江三口洪水、泥沙,造成河道湖泊泥沙淤积,洪水位抬高,加重湖区的防洪负担,造成严重的洪涝灾害。根据洞庭湖河湖疏浚规划和典型河段流挖竣工资料,运用水力学和水文学方法对疏浚前后洪水位的变化进行了分析。

Lake Dongting is an important regulating lake in the middle reach of Yangtze River. It receives the volume and sediment of floods from Xiangjiang River, Zishui River, Yuanjiang River, Lishui River and Yangtze River, which leads to the flood elevation running up because of deposit. Certainly the flood disaster in the area becomes serious, the capability of water self-cleaning and water environment bearing become lowered, which leads to the environment worsened. This paper analyzes the effect on the flood elevation of Lake Dongting dredging according to the data from the Plan of Lake Dongting dredging and the typical reach dredging completed.