珠江河口地区桥梁阻水效应分析

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。

Analysis on the Water-Flow Retardation of Pearl River Estuary Bridge Area

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 diversion 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 indicates ： as 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; whatg 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.