本文關(guān)鍵詞： 外釣山島 水下岸坡 沖淤變化 數(shù)值模擬 影響　出處：《浙江海洋大學》2017年碩士論文　論文類型：學位論文

【摘要】：通過對外釣山島整島開發(fā)對周邊港區(qū)和航道的影響的研究,可以深入了解外釣山島附近海域的流場和泥沙運移趨勢,進一步認識水下岸坡的沖淤調(diào)整規(guī)律,并為港區(qū)航道資源的優(yōu)化整合和深水泊位的集約利用提供一定的參考依據(jù)。本文利用2004年、2007年和2011年3個年份的水深地形資料,應用GIS技術(shù)建立了這些年份外釣山島海域的數(shù)字高程模型,對外釣山島開發(fā)前岸線變化、特征等深線分布、水下岸坡的平面沖淤變化和典型剖面的調(diào)整等方面進行了較系統(tǒng)的分析,同時通過建立Delft-3D水動力數(shù)值模型,預測開發(fā)后水動力環(huán)境的變化狀況和泥沙的沖淤變化,并探討了外釣山島開發(fā)前后水下岸坡的沖淤動態(tài)趨勢以及對周邊港區(qū)和航道的影響。結(jié)果表明:(1)外釣山島是一個南北向的狹長型基巖島嶼,長期接受N-S向往復潮流和來自長江的過境泥沙,并在圍墾筑堤影響下不斷沖淤,近期岸線在碼頭的局部岸段發(fā)生了變化,總體位置保持穩(wěn)定。(2)開發(fā)前,外釣山島的0m特征等深線呈現(xiàn)出向海推移的發(fā)展趨勢,潮灘面積由2004年的0.40km2增加至2011年的0.42km2;20和50m特征等深線的分布在外釣山島東西兩側(cè)以向岸退移為主,外釣山島海岸剖面總體上形成“上淤下沖”的基本格局。(3)開發(fā)后,碼頭工程對岸流速有所增大,幅度為10%~20%左右,由于碼頭群樁的阻流作用,碼頭沿線明顯淤積,幅度約0.40~0.90m/a,碼頭前沿的航道基本上處于沖淤平衡狀態(tài),對周邊港區(qū)和航道的影響不大。
[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.
【學位授予單位】：浙江海洋大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U612;U652

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1 徐彥兵;外釣山島整島開發(fā)對周邊港區(qū)和航道的影響研究[D];浙江海洋大學;2017年

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