全部

力学与实践 ›› 2004, Vol. 26 ›› Issue (1): 0-0.doi: 10.6052/1000-0992-2003-193

• 应用研究 •    

分流河道淤积与洞庭湖萎缩对长江洪灾的影响

范平 李家春 刘青泉   

  1. 中科院力学所 北京 100080 中科院力学所 北京 100080 中科院力学所 北京 100080
  • 收稿日期:2003-05-27 修回日期:2003-09-19 出版日期:2004-02-10 发布日期:2004-02-10

INFLUENCES OF THE SHRINK OF DIVIDING CHANNELS AND THE DONGTING LAKE ON THE FLOOD IN THE YANGZTE RIVER

  • Received:2003-05-27 Revised:2003-09-19 Online:2004-02-10 Published:2004-02-10

摘要: 1998年长江流域的特大洪水灾害表明,目前长江流域防洪体系在面临特大洪水时仍然显得 比较脆弱. 以长江中下游荆江洞庭湖地区为背景,运用有限体积计算方法建立了一维河 道和二维湖泊交错的复杂水系洪水演进数值模型,细致分析了由于分流河道淤积以及洞庭湖 萎缩对长江洪灾的影响. 得出长江分流河道和洞庭湖由于泥沙淤积产生的萎缩将造成长江干 流河道洪水期间水位抬升,从而加重长江的洪水灾害. 其结论可为长江中下游地区的 洪水治理提出建设性意见.

关键词: 有限体积法, 洪水演进, 复杂水系, 分流河道

Abstract: The flood disaster along the Yangzte river in 1998 which brought about enormous economic losses to Chinese people shows that the flood control system of the Yangzte River is still very weak despite of enhanced capabilities of flood prevention in these years. Focusing on the Jingjiang River and Dongting Lake area, a numerical FVM model is established to study flood routing in this complicated water system consisting of one-dimensional rivers and two-dimensional lakes. By applying this model, the simulation of flood motion in the river network owing to geographical environment factors are analyzed in detail. Two important factors that may cause high stages in the Jingjiang River during the 1998 Yangzte River flood period have been identified. They are, the blockage of the dividing rivers and shrink of the Dongting Lake. According to this research, a number of measures can be adopted to mitigate the flood disaster in the Yangtze River valley.

Key words: FVM method, flood routing, complicated water