福姜沙水道深水航道选汊动床试验研究

Study on channel selection in Fujiangsha waterway regulation by movable bed experiment

福姜沙河段有福南、福北、福中三汊可选通航汊道,而目前三汊都不满足12.5 m深水航道尺度要求,必须进行整治,而选哪一汊为通航汊道成为整治工程首要任务。为此利用潮流泥沙河工模型研究各汊道整治工程效果及影响,对通航汊道进行初选。动床试验表明:通过整治,福南水道维持12.5 m水深,单向通航要求仍较困难,其进口及中部碍航段改善效果较差;福北水道受如皋中汊过流断面限制及碍航段较多,河势发展受到限制,双向通航难度大,暂可考虑单向通航;福中水道目前处于发展阶段,且整治工程对周边环境影响较小,整治难度相对较小。

There are three channels which can be navigation paths in Fujiangsha river reach. However, they all don＇ t meet the scale requirement of 12.5 m deep waterway, so this river reach shall be regulated, and the selection of the channel as a navigable path is the primary task. In this research, effectiveness and impact of regulation in each channel is studied by means of tidal current and sediment physical model experiment. Based on the experiment, preliminary choice of the navigation path can be determined. The movable bed experiment shows that the south channel of Fujiangsha waterway can maintain 12.5 m deep after regulation, but one-way traffic is still hard to be satisfied and the effect in the entrance and middle of the channel is poorer. It＇s difficult to realize two- way traffic in the north channel of Fujiangsha waterway because this channel is restricted by the cross-section of Rugao middle channel and there are too many navigation-impeding sections in this channel. So one-way traffic can be considered in the north channel at present. As to the middle channel of Fujiangsha waterway, the difficulty of regulation is relatively small because this channel is at the development stage now and the regulation has less effect on the surrounding environment.