李聶貴 1，田 立 2，周 賽 3

　　(1.水利部南京水利水文自動化研究所，江蘇 南京 210012;

　　2.江蘇省水文水資源勘測局南通分局，江蘇 南通 226006;

　　3.江蘇南水科技有限公司，江蘇 南京 210012)

　　摘 要：為更全面、更科學地研究大型跨江建設項目對多汊道河床的綜合影響，以滬通長江大橋為例，在施工期對工程河段進行系統全面的水文監測，實時掌握施工區水流動力條件的動態發展，分析大橋建設對河床響應的影響。結果表明，滬通長江大橋施工期間對斷面流速分布的影響較小，各汊道分流比、分沙比基本穩定;施工期橋軸線區域河床深槽平面有一定沖刷發展，瀏海沙水道 28，29# 主墩沉井局部沖刷深度分別為 28.1，19.1 m，29# 沉井因采用預防護措施，有效減少了沉井周邊局部沖刷。后期應加強沉井的局部沖刷保護與監測，為大橋維護及工程河段同類大型橋梁建設提供科學依據。

　　關鍵詞：滬通長江大橋;水文監測;河勢;分流比;沖刷

　　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