该文根据珠江河口地区已建桥梁情况，对桥梁建设后的阻水效应进行分析。研究结果表明：在珠江河口地区，桥梁的阻水效应与桥墩阻水比有关，阻水比越大，阻水效应越大；桥梁所在河道断面的流速越大，阻水效应就越大；同时桥梁阻水还存在叠加效应，桥梁间距越小，叠加效应越明显，但当桥梁间距超出一定范围后，其叠加效应将不再明显。%The estuary region of Pearl River is densely distributed by numerous water networks and various bridges .As a result , due to the water-flow retardation effects of the piers , the construction of the bridge will bring about certain impacts to the flood di-version capacity of the river channel .Therefore, according to the existing bridge construction situations in the estuary region of Pearl River , analysis on the water -flow retardation effects of the piers'after construction has been carried out .The investigation result in-dicateas far as the estuary region of Pearl River is concerned , the water-flow retardation effect of the bridges is related with the piers'water-flow retardation proportion .To be specific , the higher the proportion is , the greater the water-flow retardation effect will be;what's more, in the river section where the bridge is built , the more rapid the flow velocity is , the greater the water-flow retardation effect will be;meanwhile, there are also superimposed effects in the water -flow retardation effects of the bridge .More specially, the smaller the pier spacing is, the more obvious the superimposed effect will be .However, when this spacing exceeds certain scope , such superimposed effect will no longer be distinct .
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