根据近年来东江下游及三角洲河道水文情势的变化，分析东江下游及三角洲河段供水水源保证工程建设的必要性。
According to variation of the hydrologic state, the paper mainly analyses the necessity of the source ensuring project of Dongjiang river and its delta waterway.
但防洪工程建设项目实施后，将给长江河道演变、江湖关系、水文情势等带来一系列的变化。
But the flood control projects will bring about a series of changes to the river channel evolution of the Yangtze, the river lake relation and hydrologic regime etc.
经过实践验证，可有效应用于防洪治河，河道工程规划设计、河道管理和清障等方面的水文水力计算。
It can effectively use to hydrologic and hydraulic calculation of the flood control and river control, the planning programming of the river project, the river management and the clearing barrier.
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