摘要
随着长江上游干支流众多大型水利工程的修建,特别是三峡大坝和南水北调工程陆续完工并投入运行,以及退耕还林和水土保持工程的实施,使得长江入海泥沙量急剧减少,导致长江三角洲淤涨速率减缓,并可能使长江三角洲出现逐渐退化和萎缩现象。论述了长江三角洲的形成过程,分析了上游水利工程、海平面上升、地面沉降和人类活动等对长江三角洲的影响,提出了目前仍在实施的围海造地是有效防止或缓解长江口三角洲免遭侵蚀的有效途径。
With the construction of many hydro-projects in both the trunk stream and tributary the upper reaches of the Yangtze River, especially the Three Gorges Project and the South-to-North Water Diversion Project, and the implementation of converting farmland into forest and grass as well as soil and water conservation, sediment discharge into the sea in the Yangtze River is declining quickly. This reduces the silting rate of the Yangtze River Delta and might degenerate the Yangtze River Delta as well. Formation process of the Yangtze River Delta is discussed, and the impacts of upstream hydro-projects, rising sea level, land subsidence and human activities upon the Yangtze River Delta are analyzed. It is put forward that the coast reclamation which is still being carried on at present is an effective way to prevent the Yangtze River Delta from erosion. The result from the study has some guiding significance to the practice.
出处
《水土保持通报》
CSCD
北大核心
2007年第3期132-137,共6页
Bulletin of Soil and Water Conservation
基金
国家973计划"西南喀斯特山地石漠化与适应性生态系统调控"子课题"西南喀斯特山地土壤侵蚀过程与水土流失危险度评价(2006CB403203)"资助
关键词
长江三角洲
输沙量
三峡工程
南水北调
水土保持
围垦
Yangtze River Delta
sediment discharge
Three Gorges Project
South-to-North Water Diversion Project
soil and water conservation
land reclamation
