摘要
洞庭湖历经沧桑变迁.汉末以前湖盆与水位均较荆江低,东汉后期,天然植被不断遭到破坏,使湖水水位渐高于荆江,造成湖高江低,出现江、湖两安之势.宋代湖区周围垦辟活动增强,森林破坏极大.荆江江面束狭,河床逐步增高.元明时期,多次疏浚调弦、虎渡等穴口,造成江水入湖.清代水土流失加剧,藕池、松滋相继决口,从此四口分泄荆江洪水与泥沙,造成湖面萎缩,洞庭湖退居为第二大淡水湖.
The Dongting Lake was vicissitudenous. By the end of the Han Dynasty, the Dongting Lake basin was lower than the water level of the Yangtze River and it turned to be higher than the water level of the Yangtze River at the end of the East-Han Dynasty, but no flood then. During the Song Dynasty, the Yangtze' s riverbed turned to be higher step by step. During the Yuan and Ming Dynasty, Tiaoxian Hole and Hudu Hole were dredged many times. And During the Qing Dynasty, Songci Hole gapped after the gaping of Ouchi Hole because of the intense soil erosion. Since then, the flood and the silt were released by the four holes, which caused the shrink of the lake area from the largest freshwater lake to the second largest one.
出处
《长沙电力学院学报（自然科学版）》
2002年第4期86-89,共4页
JOurnal of Changsha University of electric Power:Natural Science
