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在珠江三角洲河网区河道上,联圩筑闸并小圩成大圩或在口门滨海区进行较大面积的海滩围垦工程以后,会导致外江河道水文发生某种程度上的变化.如在河道上联圩筑闸后,水闸控制运用时闸前外江的最高洪(潮)水位和最低水位的抬高,会使附近的防洪、排涝工程受到一定的影响.其影响程度,愈向上游,影响愈小,达到上游的一定距离即行消灭.而在闸后的河道最高洪(潮)水位和最低水位均有所降低,使所修建工程和附近的防洪、排涝工程收到一定的效益,愈向下游,效益也就越小.为此,在进行有关
In the Pearl River Delta river network of the river, the joint construction of the dam and the small Wei Chengda Wei or in the mouth of the coastal area for a larger area of beach reclamation project, will lead to a certain degree of hydrological changes outside the river, such as Flood control and drainage projects in the vicinity will be affected to a certain extent after the construction of sluices in conjunction with the levees over the river channel and the elevation of the highest flood (tide) and lowest water level of the outer river before the sluice control operation. Travel, the impact of the smaller, to reach a certain distance upstream to eliminate.And after the floodgate in the highest flood (tide) and the lowest water level are reduced, so that the construction of the project and nearby flood control and drainage projects have received some benefits , The more downstream, the less effective. To that end, the relevant