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  本文關(guān)鍵詞：炸礁工程懸浮物在強潮海域擴散的數(shù)值計算研究　出處：《浙江大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： Delft3D 懸浮泥沙 強潮海域 數(shù)值模擬 炸礁 海洋生態(tài)環(huán)境

【摘要】：舟山背靠長江三角洲等遼闊腹地和滬、杭、甬等大中城市群,面向太平洋,是長江流域和長江三角洲對外開放的海上門戶和通道。舟山海域遼闊,島嶼眾多,擁有得天獨厚的深水港灣,獨特的島嶼陸地,四通八達的深水航道,眾多的錨地和寬闊的深水港池。隨著長三角經(jīng)濟一體化、寧波舟山港港口一體化的不斷推進、上海國際航運中心洋山港區(qū)建成以及舟山江海聯(lián)運服務(wù)中心的設(shè)立,舟山區(qū)位優(yōu)勢不斷提升,港口岸線資源也逐漸得到開發(fā)。本文研究海域位于蝦峙門水道與條帚門水道之間的西白蓮山島附近,西白蓮山島位于舟山市普陀區(qū)蝦峙島的西北,該島港口航道資源優(yōu)勢明顯,但其周圍暗礁眾多,船舶航行時易發(fā)生觸礁危險,使得該島岸線資源開發(fā)受到限制。為消除暗礁對通航船舶的影響,某用海單位考慮對西白蓮山島西側(cè)幾處暗礁進行清理,然后再將西白蓮山島西側(cè)海域用于港口開發(fā)。經(jīng)初步查明,礁石為凝灰?guī)r,因此只能采取先鉆孔爆破將其解體,再用挖泥船等設(shè)備對礁渣進行清理的施工方案。炸礁和清渣施工工藝將不可避免產(chǎn)生高濃度的懸浮物,懸浮物的擴散對周圍海洋生態(tài)環(huán)境產(chǎn)生一定影響,本文借助于二維潮流泥沙數(shù)值模擬,對炸礁和清礁產(chǎn)生的懸浮物擴散范圍進行預(yù)測,預(yù)測結(jié)果可為該炸礁工程的環(huán)境影響評價提供理論依據(jù),并為工程可行性研究提供參考,因此本文的研究具有一定的實際意義。本文以島礁眾多潮流復(fù)雜的舟山海域為例,基于Delft3D軟件建立了適合研究該海域的潮流數(shù)學(xué)模型,并利用該模型模擬了炸礁和清礁過程中懸浮物的輸移過程,主要研究成果及結(jié)論如下：第一：懸浮物數(shù)值模擬運算結(jié)果較為直觀的反映了炸礁和清礁過程中,漲落潮在不同時刻懸浮物的擴散情況,包括濃度增值擴散范圍和擴散距離,得出了在漲落潮時刻平均流速為1m/s的強潮海域,炸礁產(chǎn)生濃度增值0.010kg/m3以上懸浮物對周圍海域的影響時間約為0.5h,影響范圍為順流方向200m的模擬結(jié)論。而清礁產(chǎn)生懸浮物對周圍海域影響范圍較小、時間較短。為減少炸礁對周圍海域的影響,建議施工單位采取平潮間隙進行爆破施工,而清礁全潮都可以施工。第二：懸浮物擴散速度與潮流有較大關(guān)系,而與源強大小關(guān)系不大。在島礁眾多的強潮海域,由于受到漩渦潮流的影響,懸浮物的擴散速度反而會出現(xiàn)變緩現(xiàn)象。
[Abstract]:The hinterland of Zhoushan back in the Changjiang River Delta and Shanghai Hangzhou Ningbo, vast, and other large and medium-sized city group, facing the Pacific Ocean, is the Yangtze River and the Yangtze River Delta Open Sea portals and channels. The vast waters of Zhoushan, numerous islands, with richly endowed by nature deep-water harbor, unique island land, deep waterway connected, many roads the broad and deep water port pool. Along with the economic integration of Yangtze River Delta, Ningbo Zhoushan port integration continues to promote the establishment of building Shanghai international shipping center Yangshan Port and Zhoushan Jianghai transport service center, the location advantage of Zhoushan rising, harbor shoreline resources have gradually been developed. In this paper, the study area is located in the vicinity of Xiashimen channel between with a broom the west gate waterway of Lotus Mountain Island, west of Lotus Mountain island is located in Zhoushan city Putuo District xiazhimen the northwest of the island, the island harbor resources advantage is obvious, but its surrounding Many reef ship ran aground, prone to danger, making the development of coastal resources of the island is restricted. In order to eliminate the influence of the reef ship, with a clean up on the west sea units into the lotus island on the west side of a few rocks, and then west to the island on the West side of lotus sea port development. After a preliminary investigation, the rocks for tuff, it can only take the first drilling blasting dismantling it, and dredge equipment construction scheme of clean reef reef and slag slag. The construction process will inevitably produce high concentration of suspended sediments and suspended solids diffusion have a certain impact on the ecological environment around the sea, with the help of two dimensional numerical tidal sediment simulation of suspended substance on reef and reef clear diffusion range prediction, the predicted results can provide a theoretical basis for the environmental impact of the reef project evaluation, and project feasibility study. For reference, so this study has some practical significance. In this paper, many complex tidal waters of Zhoushan island as an example, based on Delft3D software was established for the study of tidal flow mathematical model of the sea, and the model was used to simulate the transport process of suspended reef and reef cleaning process, the main research results and conclusions are as follows SS: First: the numerical simulation results is more intuitive to reflect the reef and reef in the process of diffusion of the tide at different times of suspended substances, including the concentration of added diffusion range and diffusion distance, obtained in the ebb time average velocity is 1m/s strong tidal waters, reef time concentration of added 0.010kg/m3 the above suspension effect on the surrounding sea area is about 0.5h, the influence scope of the simulation conclusion downstream 200m. Due to a smaller range of influence of suspended substance on the waters around the reef is relatively clear. Short. In order to reduce the influence of the waters around the reef, the construction units taken by blasting of slack water gap, and clear the whole tidal reef can construction. Second: suspended solids diffusion velocity and the trend has great relationship, and has little relation with the source strength. In the strong tide of reef numerous, influenced by the vortex flow the diffusion velocity of suspended solids but there will be a slow phenomenon.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U616.24;X55

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本文編號：1377048