本文選題：沖淤動(dòng)態(tài)　切入點(diǎn)：水下岸坡　出處：《浙江海洋大學(xué)》2017年碩士論文

【摘要】：杭州灣南岸鎮(zhèn)海段海域位于寧波與舟山群島之間,金塘大橋西岸位于研究區(qū)內(nèi)。研究該岸段海岸歷史演變及現(xiàn)代變化的基本特征(如水下岸坡的平面沖淤變化、典型剖面的沖淤形態(tài)調(diào)整等),能夠更好地認(rèn)識(shí)淤泥質(zhì)港口岸線的發(fā)育變化歷史、沖淤演變過(guò)程和工程環(huán)境效應(yīng),能夠?yàn)楦蹍^(qū)的良好運(yùn)營(yíng)、水深維護(hù)及可持續(xù)發(fā)展提供必要的參考依據(jù),為附近海域未來(lái)其他涉海工程的施工提供指導(dǎo)意見(jiàn),尤其對(duì)于區(qū)域內(nèi)杭州灣地區(qū)環(huán)線并行線G92N(杭甬高速?gòu)?fù)線)寧波段一期工程,本文亦可為其提供相關(guān)理論支持。同時(shí)也能夠豐富河口海岸學(xué)的研究?jī)?nèi)容,為其他深水岸線資源的可持續(xù)開(kāi)發(fā)與利用提供可借鑒的經(jīng)驗(yàn)。本文在收集研究區(qū)域多個(gè)年份的海圖和水深地形圖的基礎(chǔ)上,運(yùn)用GIS技術(shù),研究了鎮(zhèn)海港區(qū)岸線變化、特征等深線分布及其水下岸坡的平面沖淤變化和典型剖面的沖淤形態(tài)調(diào)整,同時(shí)結(jié)合水文泥沙資料,從上述幾個(gè)方面討論分析了研究區(qū)域水下岸坡的沖淤動(dòng)態(tài)趨勢(shì)。結(jié)果表明:近54年來(lái),杭州灣南岸鎮(zhèn)海段附近海域潮灘和5m等深線以及水下淺灘總體均向海外移,潮灘外移幅度約334~1912m,年均外移速率約6.19~35.41m/a,5m等深線外移幅度約600~5700m,年均外移速率約11.11~105.56m/a。且研究區(qū)域附近海域總體上全部表現(xiàn)為淤積,平均淤積幅度為1.10m,年均淤積速率約2.04cm/a。可以認(rèn)為,在近自然條件下,研究區(qū)總體上是沖淤平衡的,但受?chē)看儆俣蔚热祟?lèi)工程的影響,近年來(lái)淤積速率明顯加快。同時(shí),三峽水利工程在一定程度上會(huì)減少研究區(qū)內(nèi)的泥沙量,從而在一定程度上降低淤積速率,甚至使局部區(qū)域發(fā)生沖刷。此外,受跨海橋梁的阻水作用影響,研究區(qū)內(nèi)部分泥沙落淤,橋墩附近可能出現(xiàn)局部沖刷。潮灘仍在向海發(fā)育,但隨著發(fā)育過(guò)程的進(jìn)展,其速率趨于減緩,在現(xiàn)有岸線不受影響的情況下,未來(lái)將會(huì)達(dá)成平衡。
[Abstract]:The sea area of Zhenhai section on the south coast of Hangzhou Bay lies between Ningbo and Zhoushan Islands, and the west bank of Jintang Bridge is located in the study area. The adjustment of scour and silt shape in typical sections can better understand the history of development and change of shoreline in muddy ports, the evolution process of scouring and silting and the environmental effects of engineering, and it can be used for the good operation of port areas. The maintenance of water depth and the sustainable development provide the necessary reference basis for the construction of other sea related projects in the nearby sea area, especially for the first stage of the Ningbo section of the parallel line G92N (Hangzhou-Ningbo Expressway) in the Hangzhou Bay area. This paper can also provide relevant theoretical support, and enrich the research content of estuarine and coastal science. This paper, on the basis of collecting the charts and bathymetric topographic maps of several years in the study area, applies GIS technology to study the changes of shoreline in the coastal area of Zhenhai Port, which can be used for reference in the sustainable exploitation and utilization of other deep-water shoreline resources. The distribution of characteristic isobath and the change of plane scour and deposition of underwater bank slope and the adjustment of scour and deposition form of typical section, and the combination of hydrological and sediment data, From the above several aspects, the dynamic trend of erosion and deposition of underwater bank slope in the study area is discussed and analyzed. The results show that in the last 54 years, the tidal flat, 5m isobath and underwater shoal in the Zhenhai section of the south coast of Hangzhou Bay have generally moved overseas. The average annual migration rate of tidal flat is about 6.19 ~ 35.41 m / a ~ 5 m isobath, and the average annual migration rate is about 11.11 ~ 105.56 m / a, and the average sedimentation range is 1.10 m and the average annual deposition rate is about 2.04 cm 路路a ~ (-1) 路a ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (12) m, respectively. Under the near natural conditions, the study area is generally balanced by erosion and siltation, but due to the influence of such human projects as confining and silting spur dikes, the sedimentation rate has been obviously accelerated in recent years. At the same time, the three Gorges Water Conservancy Project will, to some extent, reduce the amount of sediment in the study area. Therefore, to some extent, the sedimentation rate is reduced, and even the local area is scoured. In addition, due to the influence of the water blocking action of the bridge across the sea, some sediment in the study area may be silted, and local scour may occur near the pier. The tidal flat is still developing along the sea. However, with the progress of the development process, its rate tends to slow down, and the balance will be reached in the future when the existing shoreline is not affected.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U652.3;TV148.6

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