从水沙条件及河床地形变化规律谈长江河口综合治理开发战略问题

COMPREHENSIVE CONTROL AND DEVELOPMENT STRATEGY ON THE BASIS OF THE CHANGES IN WATER AND SILT CONDITIONS AND RIVERBED TOPOGRAPHIC FEATURES

长江河口位于长江三角洲的核心部位,由于区域高强度的城市化,对水运工程及沿岸工程在长江口水土资源的合理开发利用中提出了更高的要求,由于长江口属典型的沙岛型中等潮汐多级分汊河口,入海汊道冲淤多变,洲滩迁移频繁,泥沙运动复杂,径流潮流相互作用及盐水洪水交汇引起流场、河势变化及河床冲淤部位极不稳定。从流域来水来沙条件变化及河口河床演变规律阐明长江口治理开发的迫切性、复杂性和综合性。

The Yangtze River mouth lies at the heart of the Yangtze River delta. During the regional intensive urbanization, many should be changed in the water way transport and engineering along the river banks in order to keep the rational and sustainable development of the water and soil resources of the Yangtze River estuary. The Yangtze River estuary belongs to a typical sand-island-type of distributary tidal channels, and thus the seaward channels see frequent deposition and erosion. The interaction of the runoff and tide as well as the confluence of flood and seawater cause extremely unstable flow fields, river terrain and riverbed changes. Due to the water and silt conditions and the river mouth and riverbed changes, it should be careful and thoughtful to solve the complex problem about the control and development of the Yangtze River estuary.