外钓山岛整岛开发对周边港区和航道的影响研究

发布时间：2018-02-24 19:13

本文关键词： 外钓山岛水下岸坡冲淤变化数值模拟影响　出处：《浙江海洋大学》2017年硕士论文　论文类型：学位论文

【摘要】：通过对外钓山岛整岛开发对周边港区和航道的影响的研究,可以深入了解外钓山岛附近海域的流场和泥沙运移趋势,进一步认识水下岸坡的冲淤调整规律,并为港区航道资源的优化整合和深水泊位的集约利用提供一定的参考依据。本文利用2004年、2007年和2011年3个年份的水深地形资料,应用GIS技术建立了这些年份外钓山岛海域的数字高程模型,对外钓山岛开发前岸线变化、特征等深线分布、水下岸坡的平面冲淤变化和典型剖面的调整等方面进行了较系统的分析,同时通过建立Delft-3D水动力数值模型,预测开发后水动力环境的变化状况和泥沙的冲淤变化,并探讨了外钓山岛开发前后水下岸坡的冲淤动态趋势以及对周边港区和航道的影响。结果表明:(1)外钓山岛是一个南北向的狭长型基岩岛屿,长期接受N-S向往复潮流和来自长江的过境泥沙,并在围垦筑堤影响下不断冲淤,近期岸线在码头的局部岸段发生了变化,总体位置保持稳定。(2)开发前,外钓山岛的0m特征等深线呈现出向海推移的发展趋势,潮滩面积由2004年的0.40km2增加至2011年的0.42km2;20和50m特征等深线的分布在外钓山岛东西两侧以向岸退移为主,外钓山岛海岸剖面总体上形成“上淤下冲”的基本格局。(3)开发后,码头工程对岸流速有所增大,幅度为10%~20%左右,由于码头群桩的阻流作用,码头沿线明显淤积,幅度约0.40~0.90m/a,码头前沿的航道基本上处于冲淤平衡状态,对周边港区和航道的影响不大。
[Abstract]:Through the study of the influence of the whole island development on the surrounding port area and the channel, we can deeply understand the current field and sediment transport trend in the sea area near the Waijiaoshan Island, and further understand the regulation of erosion and deposition of the underwater bank slope. It also provides a certain reference for the optimization and integration of waterway resources and intensive utilization of deep water berths in the port area. In this paper, the bathymetric topographic data of 2004, 2007 and 2011 are used. The digital elevation model of Xiwaishan Island sea area in these years was established by using GIS technology. The shoreline changes and the characteristic isobath distribution were obtained before the development of the offshore Diaoshan Island. The change of plane scour and deposition and the adjustment of typical profile of underwater bank slope are analyzed systematically. At the same time, by establishing Delft-3D hydrodynamic numerical model, the changes of hydrodynamic environment and sediment after development are predicted. The dynamic trend of underwater bank slope before and after the development of Waijiaoshan Island and its influence on the surrounding port area and channel are discussed. The results show that Waijiaoshan Island is a long, narrow and narrow bedrock island in the direction of North and South. Under the influence of reclamation and embankment, the N-S reciprocating tide and the transit sediment from the Yangtze River have been accepted for a long time. Recently, the shoreline has changed in the local shore of the wharf, and the overall position remains stable before the development. The 0 m characteristic isobath of Waijiaoshan Island shows a trend of moving towards the sea. The area of tidal flat increases from 0.40 km ~ 2 on 2004 to 0.42 km ~ (2) ~ (20) and 50 m on 2011. The east and west sides of the isobath are mainly receding to the shore. After the development of the basic pattern of "upper silt and lower scour" on the coastal section of Waiyishan Island, the velocity of the opposite shore of the wharf project has increased, with a range of about 10% or 20%. Due to the blocking effect of the pile groups in the wharf, there is obvious deposition along the wharf. The range is about 0.40 ~ 0.90 m / a, and the channel at the front of the wharf is basically in a balance of scouring and silting, which has little effect on the surrounding port area and the waterway.
【学位授予单位】：浙江海洋大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U612;U652

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