本文關(guān)鍵詞：基于隨機(jī)游動(dòng)模型的北部灣水體動(dòng)力特征解析　出處：《廈門大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 水交換 半封閉型海灣 水交換矩陣 駐留時(shí)間 隨機(jī)游動(dòng) 數(shù)值模擬

【摘要】：為研究北部灣的水體動(dòng)力特征,本文采用隨機(jī)游動(dòng)粒子追蹤方法,建立了具有拉格朗日特性的隨機(jī)游動(dòng)模型。該模型在考慮水體擴(kuò)散效果的同時(shí),可以有效地避免對(duì)流擴(kuò)散模型中可能的數(shù)值振蕩及其導(dǎo)致的水交換計(jì)算偏差,還可以方便快速地實(shí)現(xiàn)駐留時(shí)間等水交換時(shí)間尺度的計(jì)算。該模型關(guān)于二維瞬時(shí)點(diǎn)源擴(kuò)散的模擬結(jié)果與其解析值的比較表明它能夠較好地模擬對(duì)流擴(kuò)散問(wèn)題。 結(jié)合水動(dòng)力模型,首先利用隨機(jī)游動(dòng)模型研究北部灣的水交換能力,計(jì)算北部灣水交換矩陣和水體駐留時(shí)間。結(jié)果顯示,灣內(nèi)水交換規(guī)律呈現(xiàn)出與環(huán)流結(jié)構(gòu)相似的季節(jié)性變化特征；季風(fēng)作用下的水體駐留時(shí)間較短,各分區(qū)之間水交換比較活躍；冬季東北風(fēng)作用下的廣西沿岸水駐留時(shí)間最長(zhǎng),紅河河口水駐留時(shí)間最短；夏季西南風(fēng)作用下廣西沿岸水駐留時(shí)間最短,其水體可延伸至中部海域。 其次,利用隨機(jī)游動(dòng)模型研究北部灣的水體遷移特征。研究結(jié)果表明,瓊州海峽與南部灣口為北部灣灣內(nèi)水體與外海水交換的重要通道。在冬季環(huán)流和潮流影響下,源地在瓊州海峽西口的水體可影響北部灣東北水域,該區(qū)域水體具備粵西沿岸水的特征;而源地為海南島西側(cè)海域的水體被限制在海南臨高鄰近海域；夏季源地為瓊州海峽西口的水體主要貼近雷州半島和廣西沿岸逆時(shí)針?lè)较蛞苿?dòng),流幅窄;源地為海南島西側(cè)海域的水體向北拓展距離僅在40～50km左右就轉(zhuǎn)向西和西南方向。北部灣中部以西海域水體受入海徑流的沿程影響,在局部范圍是相當(dāng)顯著的。越南沿岸入海徑流的影響范圍主要集中于距海岸20-701km左右的范圍內(nèi),冬季影響范圍明顯擴(kuò)大,離岸可達(dá)30km左右,廣西沿岸入海徑流量相對(duì)較小,影響范圍多局限在距海岸20km以內(nèi)的近岸區(qū)域。 最后,利用隨機(jī)游動(dòng)模型研究臺(tái)風(fēng)對(duì)中尺度海灣水體遷移的影響。結(jié)果顯示臺(tái)風(fēng)路徑東側(cè)海域水體偏離原軌跡運(yùn)動(dòng)顯著,受臺(tái)風(fēng)影響較大,西側(cè)海域水體運(yùn)動(dòng)變化不大。從單純潮、潮與月平均風(fēng)、潮與臺(tái)風(fēng)三種不同條件下的粒子偏移初始位置距離差的對(duì)比中可以看出,海燕臺(tái)風(fēng)過(guò)境后對(duì)過(guò)渡性水域水體的動(dòng)力過(guò)程影響最大,對(duì)越南南岸的水體影響最小。 研究還表明,鐵山港通過(guò)沙田以南灣口處與北部灣海水進(jìn)行交換,灣內(nèi)水體交換主要受潮汐控制,上層水體較下層水體水交換率大,灣口和灣中水交換較快；落潮期水體交換速度明顯快于漲潮期；單點(diǎn)中性示蹤粒子運(yùn)動(dòng)軌跡顯示,儒艮保護(hù)區(qū)正處在鐵山港與北部灣海水交換的活躍區(qū)內(nèi)；山口紅樹(shù)林保護(hù)區(qū)受到沙田半島本埠、石頭埠和白沙河水體的影響。
[Abstract]:For the water power characteristics of Beibu Gulf, the random walk particle tracking method, established the model of random walk with Lagrange. The characteristics of the model in consideration of water diffusion effect at the same time, can effectively avoid the possible numerical oscillation of convection diffusion and the resulting water exchange model calculation error, also can realize a resident the calculation time of water exchange time scales. The simulation results of the model on the two-dimensional instantaneous point source diffusion and its analytical value shows that it can simulate the convection diffusion problem.
Combined with the hydrodynamic model, first using the random walk model of the North Bay water exchange capacity, calculation of Beibu Gulf water exchange matrix and water residence time. The results showed that the bay water exchange law shows seasonal variation characteristics similar to the monsoon circulation structure; under the action of the water residence time is short, the partition between the water exchange between active; winter northeast wind under the action of Guangxi coastal water residence time is the longest, the Red River estuary water residence time is very short; summer southwest wind Guangxi coastal water residence time is the shortest, the water can be extended to the central sea area.
Secondly, using the random walk migration characteristics of Northern Bay water model. The results show that the Gulf Strait and South Qiongzhou port is an important channel of Beibu gulf bay water and seawater exchange. In the winter circulation and under the current source in Xikou Qiongzhou Strait waters can affect the waters of the Northeast in the northern Gulf, characteristics the regional water has Yuexi coastal water; and the water source is on the west side of Hainan Island sea area is limited in Hainan Lingao adjacent waters; summer from west of the Qiongzhou Strait water close to the Leizhou Peninsula and the Guangxi coast clockwise movement of the narrow flow; for the water source in North Western Hainan Island waters expand distance only in 40 50km turned to the West and southwest. The northern Gulf waters west of the middle part of the water along the river runoff influence, in the local area is significant. The Vietnam coastal runoff. The ring range is mainly concentrated in the range of 20-701km away from the coast. The influence range of winter is obviously expanded, and the offshore area can reach 30km. The coastal traffic volume along Guangxi coast is relatively small, and its influence is mostly confined to the Nearshore Area within 20km of the coast.
Finally, using the random walk model of typhoon migration on Mesoscale Bay. The results showed that the typhoon path east sea water movement significantly deviated from the original track, influenced by the typhoon, the sea water movement. Little change from simple tide, tide and monthly mean wind, tide and typhoon compared three kinds of particle migration in different conditions of initial position the distance difference can be seen in the transitional waters of typhoon Haiyan water dynamic process of water impact, impact on Vietnam south of the minimum.
The research also shows that, through the South Bay mouth to Tieshan'gang Sha Tin and water exchange in the Gulf of Beibu Gulf, water exchange is mainly controlled by tide, the water to lower water exchange rate, water outlet and bay Bay exchange faster; ebb tide water exchange rate was faster than the high tide period; single point neutral particle trajectory tracing display. Dugong protection zone is in the northern Gulf seawater exchange and Tieshan'gang active zones; Shankou mangrove reserve by the peninsula Sha Tin port, port and the water stone effect.

【學(xué)位授予單位】：廈門大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P731.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 于洪彬,蔣維楣;隨機(jī)游動(dòng)擴(kuò)散模式在區(qū)域大氣環(huán)境影響評(píng)價(jià)中的應(yīng)用[J];電力環(huán)境保護(hù);1994年01期

2 姚仁太;排放高度對(duì)建筑物尾流擴(kuò)散影響的分析與蒙特卡羅模擬[J];輻射防護(hù);2001年04期

3 唐軍;沈永明;邱大洪;;近岸波浪破碎區(qū)污染物運(yùn)動(dòng)的數(shù)值模擬[J];中國(guó)工程科學(xué);2007年12期

4 池兵;方棟;李紅;;隨機(jī)游走大氣擴(kuò)散模型在核事故應(yīng)急中的開(kāi)發(fā)和應(yīng)用[J];核科學(xué)與工程;2006年01期

5 高抒,謝欽春;狹長(zhǎng)形海灣與外海水體交換的一個(gè)物理模型[J];海洋通報(bào);1991年03期

6 李希彬;孫曉燕;宋軍;姚志剛;;湛江灣三維潮汐潮流數(shù)值模擬[J];海洋通報(bào);2011年05期

7 董禮先,蘇紀(jì)蘭;象山港水交換數(shù)值研究�、�.模型應(yīng)用和水交換研究[J];海洋與湖沼;1999年05期

8 匡國(guó)瑞;海灣水交換的研究—海水交換率的計(jì)算方法[J];海洋環(huán)境科學(xué);1986年03期

9 胡建宇;羅源灣海水與外海水的交換研究[J];海洋環(huán)境科學(xué);1998年03期

10 畢遠(yuǎn)溥,劉海映,蔣雙,薛克,王年斌;小窯灣海水交換與環(huán)境預(yù)測(cè)的初步研究[J];海洋環(huán)境科學(xué);2000年03期

，

本文編號(hào)：1357508