洞庭湖的形成、演变与洪涝灾害

Evolution of Lake Dongting and Its Flood Disasters

洞庭湖是由构造运动奠定基本格局 ,又叠加了江河作用以及人类活动的多因素的混成湖。以全新世开始为界 ,洞庭湖演变分为两个阶段 :自然演变阶段 ;人类活动—自然复合作用演变阶段。洞庭湖区的洪涝灾害的时空分布是有一定规律的 ,荆江北岸大堤堵口是导致洞庭湖洪涝灾害频繁的根源 ,人类围垦是洪灾加剧的重要因素。

Dongting basin was shaped not only by tectonic movement but also by potamic and anthropogenic influence. Lake Dongting's evolution can be fallen into two successive phases: natural evolution before Holocene and the later evolution phase effected by both natural and human activity. The research showed that dike building along the northern bank of Yangtze River and cultivation in Lake Dongting area has caused increasing of frequency and intensity of flood disasters in Lake Dongting area.