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传统的观点认为,河水流入大海是一种浪费。为了充分利用河水资源,在大河干流筑坝引水、发电,据美国学者Milliman(1997)统计,1950年世界上大坝的数量约为5000座,20世纪80年代疾增到40000多座。大量淡水被贮存或用在陆地,入海径流便大幅度减少,导致大河河口及其邻近海域生态环境发生重大变化,海洋生物资源遭受到重大损失。加利福尼亚湾内科罗拉多河河口三角洲及其滨海区原为美国西南部最大的沙
The traditional view that the river into the sea is a waste. In order to make full use of river water resources, dam water diversion and power generation in the main rivers, according to the American scholar Milliman (1997), the number of dams in the world was about 5,000 in 1950 and to more than 40,000 in the 1980s. Large amounts of fresh water are stored or used on land, resulting in a significant reduction of runoff into the sea, resulting in major changes in the ecological environment of the Dahe Estuary and its adjacent sea areas, resulting in significant loss of marine living resources. Colorado River Delta and its coastal area of the Colorado River was originally the largest sand in the southwestern United States