围涂对长江口北支河势影响分析

Effect of the reclamation project on the north branch of Yangtze River estuary

上世纪五十年代以来长江口北支的大量资料表明,围涂对长江口北支河势影响巨大。北支的洲滩圈围打破了原有的自然平衡状态,改变了平面形态、水流条件以及大幅度地减少了河槽容积,加剧了河床演变,引发了涌潮和航道淤塞,上世纪九十年代后的围涂促使北支向缩窄方向发展。研究围涂对长江口北支河势的影响,将对该地区水土资源的可持续利用和经济的可持续发展具有重要意义。

Since the 19.50s, data has indicated that the north branch of Yangtze River estuary has changed enormously due to reclamation projects, which have caused the original natural balance to be broken, the plane configuration and flow condition to be changed, and the channel capacity to be decreased greatly. As a result, the reclamation projects hare also expedited the evolution of river bed, and aroused tidal bore and silting. The north branch became narrower and narrower after the 1990s. The research on the effect of the reclamation projects is of important value to the sustainable use of water and soil resources and economic development in the area.