基于河势变化条件的张靖过江通道线位比选分析

Comparison and selection of Zhangjing cross river passage location based on river regime variation

长江澄通河段福姜沙段多汊并存,受上游径流和下游潮流双重作用,水动力条件和河床演变复杂。拟建张靖过江通道线位,南岸在张家港市十字港附近,北岸在靖江市新六助港-夏仕港之间,横跨福姜沙及福左、福右汊道。过福右汊道拟采用隧道工程(A线),过福左汊道有桥梁工程(A1线)和隧道工程(A2)两种方案。采用实测资料对近期张靖过江通道拟选线位上下游附近河势变化、河床稳定性等进行了研究,就工程河段滩槽、深泓稳定性和河床断面、冲淤变化等进行了对比分析。通过分析,推荐采用河床较为稳定的“A+A1”线位方案作为张靖过江通道方案。研究成果可为工程设计和决策提供技术依据.

Under the dual action of upstream runoff and downstream tidal current,the hydrodynamic conditions and riverbed evolution are complicated in Fujiangsha section of the Yangtze River Chengtong reach.The south bank of the proposed Zhangjing cross Yangtze River passage is near the Shizi Harbor of Zhangjiagang City,and the north bank is between Xinliuzhu and Xiashi Harbors of Jingjiang City.The river-across project crosses the Fujiangsha sandbar and two channels that envelope the Fujiangsha sandbar.According to Plan A(crossing the channel at right of Fujiangsha sandbar),an under-river tunnel is employed.As to cross the left channel,there are two choices named A1 and A2.A1 is building a bridge in the upper reach,A2 is building another under-river tunnel in the lower reach.This study focuses on the analyses of the stability of the shoals,channels,thalweg,riverbed profiles,and the variations of riverbed erosion and deposition.Based on the comprehensive consideration of the riverbed morphology,the plan of“A+A1”is chosen.This research can provide a technology basis for engineering design and decision-making.