| 引用本文: | 杨达源,李徐生,张振克.长江中下游湖泊的成因与演化.湖泊科学,2000,12(3):226-232. DOI:10.18307/2000.0306 |
| YANG Dayuan,LI Xusheng,ZHANG Zhenke.Lake Evolution along Middle-Lower Reaches of the Yangtze River. J. Lake Sci.2000,12(3):226-232. DOI:10.18307/2000.0306 |
|
| 摘要: |
| 长江中下游湖泊洼地的成因比较复杂,以构造沉降控制的湖泊洼地规模较大,也比较深,但大部分湖泊洼地属支流河口洼地、扇缘洼地、河间洼地.湖泊水位受到长江干流水位的制约.在冰期低海面时期,长江干流下切,沿江湖泊多干涸;冰后期海面上升,长江干流自河口而上相继发生水位上升,加上降水的变化,导致沿江洼地逐渐蓄水为湖.长江中下游湖泊的演化趋势是不同程度地被泥沙充填、容积不断缩小并导致湖水位涨落年变幅增大与洪水威胁上升,它是长江中下游洪灾不绝的主要原因. |
| 关键词: 湖泊演化 长江中下游 |
| DOI：10.18307/2000.0306 |
| 分类号: |
| 基金项目: |
|
| Lake Evolution along Middle-Lower Reaches of the Yangtze River |
|
YANG Dayuan, LI Xusheng, ZHANG Zhenke
|
|
Department of Urban & Resources Sciences, Nanjing University, Nanjing 210093, China
|
| Abstract: |
| The origins cases of the lakes along the middle-lower reaches of the Yangtze River are complicated.Lakes formed mainly by tectonic subsidence are of large scale and depth.But most of the lakes are tributary-mouth depressions, fan-edge depressions and interchannel depressions.The water level of the lakes is controlled by the water level of the main stream of the Yangtze River.During the glacial age and lower sea-level age, the main stream of the Yangtze River had eroded downward, and the lakes along the Yangtze River had dried up.During the postglacial age, the water level of the Yangtze River had risen from the river mouth to upper reach in succession, and in this case, the depressions along the Yangtze River had stored water and lakes came into being.The evolution trend of the lakes along the Yangtze River is that the lakes are filled by silt deposition and their static volumes decrease which lead to the annual change range of the lake level increasing and flood level keeping on rising.This is the main cause of the unceasing flood disasters along the middle-lower reaches of the Yangtze River. |
| Key words: Lake evolution middle-lower reaches of the Yangtze River |
