李聂贵 1，田 立 2，周 赛 3

　　(1.水利部南京水利水文自动化研究所，江苏 南京 210012;

　　2.江苏省水文水资源勘测局南通分局，江苏 南通 226006;

　　3.江苏南水科技有限公司，江苏 南京 210012)

　　摘 要：为更全面、更科学地研究大型跨江建设项目对多汊道河床的综合影响，以沪通长江大桥为例，在施工期对工程河段进行系统全面的水文监测，实时掌握施工区水流动力条件的动态发展，分析大桥建设对河床响应的影响。结果表明，沪通长江大桥施工期间对断面流速分布的影响较小，各汊道分流比、分沙比基本稳定;施工期桥轴线区域河床深槽平面有一定冲刷发展，浏海沙水道 28，29# 主墩沉井局部冲刷深度分别为 28.1，19.1 m，29# 沉井因采用预防护措施，有效减少了沉井周边局部冲刷。后期应加强沉井的局部冲刷保护与监测，为大桥维护及工程河段同类大型桥梁建设提供科学依据。

　　关键词：沪通长江大桥;水文监测;河势;分流比;冲刷

　　Hydrological monitoring and data analysis of the engineering reach during the construction of Hutong Yangtze River Bridge

　　LI Niegui 1，TIAN Li 2，ZHOU Sai 3

　　(1.Nanjing Research Institute of Hydrology and Water Conservation Automation，Ministry of Water Resources，Nanjing 210012，China;

　　2.Jiangsu Province Hydrology and Water Resources Investigation Bureau of Nantong，Nantong 226006，China;

　　3.Jiangsu NIHWA Technology Co.，Ltd.，Nanjing 210012，China)

　　Abstract：To study the comprehensive impact of large-scale river-crossing construction projects on multi-channel riverbeds, Hutong Yangtze River Bridge is taken as an example. Hydrological monitoring was implemented systematically at the engineering reach during the construction. The hydrodynamic conditions in the construction area were monitored in real time, so that the influence of the bridge construction on the river bed response was analyzed. The results show that the construction of Hutong Yangtze River Bridge only has a little influence on the cross-section velocity distribution, while the diversion ratio and sediment ratio of each branch were basically stable. There was scouring development on the deep channel of the riverbed in the bridge axis area during the construction. The local scouring depths of the main open caissons of No.28 and No.29 in Liuhaisha waterway were 28.1 m and 19.1 m respectively, and the local scouring around the open caisson of No.29 was effectively reduced by adopting preventive measures. In the future, the local scouring protection and monitoring of open caisson should be strengthened to provide scientific references for bridge maintenance and similar large-scale bridge construction of the engineering reach.

　　Key words：Hutong Yangtze River Bridge;hydrological monitoring;river regime;diversion ratio;scouring