长江下游张南上浅区航道整治效果评价

张家洲南港上浅区是长江下游著名的浅险水道之一,实施航道整治工程前,水道枯水期航道条件恶劣,航道浅情和船舶事故频发,通航安全难以保证,航道建设、管理与维护难度大。介绍了张家洲水道基本情况和航道整治工程概况,分析了张家洲南港上浅区航道整治工程前后河势条件、航道条件的变化以及整治建筑物的稳定性,对工程方案、工程结构型式及工程实施综合效果进行了评价,总结了工程实施的经验,并对整治工程的后续维护与管理提出了建议。分析认为工程实施后,河势格局更趋稳定,南、北港汊道分流比变化不大,4 m线全线贯通,5 m线间断长度明显缩短,水深年际波动趋于稳定,通航条件明显改善,对下浅区的冲淤影响不大,整治建筑物总体保持稳定,达到了预期整治目标,完全能够满足4.5 m×200 m×1 050 m的航道设计标准。

Waterway regulation works evaluation for Zhangjiazhou south

The Zhangjiazhou waterway is one of the navigation hindering reaches of the downstream Changjiang River. Before the completion of the waterway regulation works, the channel was in a very bad condition during the dry season, and navigational accidents occurred frequently. It was difficult to ensure navigation safety because of having many difficults in waterway construction, management and maintenance. In this paper, the basic situations and regulation works are presented, and the changes in the river regime, waterway conditions and the stability of the regulation works before and after the completion of construction are analysed. Based on the summation of operation experiences from the regulation works, it is suggested that the ongoing management and maintenance must be done for the regulation works in the future. The practical operation of the regulation works shows that the river regime is more stable; the south and north branches have little changes in diversion ratio; the navigation conditions are significantly improved; all the channel has a depth of 4 m; and an interval length of the depth of 5 m is shortened greatly, therefore, the annual fluctuation of water depth tends to be stable. Having little effect on the scouring and deposition along the lower shallow area, the overall regulation works have achieved the expected remediation goals, and completely met the design standards of 4.5 m×200 m×1 050 m for the navigation channel.