本文關(guān)鍵詞： 長江口 深水航道工程 FVCOM模型 粘性泥沙 沉速公式 鹽度層化　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：長江口深水航道工程自建設(shè)以來已經(jīng)發(fā)揮了巨大經(jīng)濟效益和社會效益,但同時也面臨著航道回淤量較大、回淤位置比較集中的問題。為了研究長江口深水航道泥沙運動規(guī)律,探索航道回淤原因,本文基于FVCOM三維水動力、鹽度、懸沙數(shù)學(xué)模型和平面二維浮泥模型建立了長江口深水航道工程海域的水-沙-鹽度數(shù)學(xué)模型,對深水航道工程區(qū)域的泥沙運動規(guī)律和航道淤積機理就行了研究。本文的具體研究內(nèi)容和主要結(jié)論如下:(1)提出了綜合考慮溫度、粒徑、含沙量、鹽度、紊動強度對絮凝影響的粘性泥沙沉速公式,并結(jié)合現(xiàn)場觀測及實驗數(shù)據(jù)確定公式中部分參數(shù),得到了適用于長江口深水航道工程的泥沙沉速公式,公式計算得到的沉速范圍與前人研究結(jié)果基本一致。(2)根據(jù)建立的長江口深水航道工程三維水動力、鹽度、泥沙數(shù)學(xué)模型模擬結(jié)果,研究并分析了鹽度層化效應(yīng)對長江口附近海域水動力和懸沙垂向分布的影響,結(jié)果表明考慮鹽度層化效應(yīng)后,密度層化產(chǎn)生的紊動抑制使得垂向紊動粘性減小,表層流速變大,底層流速變小,流速垂向平均值變大,懸沙分層更為明顯,表層含沙量變小,底層含沙量變大,考慮層化效應(yīng)的速度和含沙量分布與實測值更為吻合。層化效應(yīng)對長江口水動力和泥沙運動有重要影響。(3)對本文所建立的三維數(shù)學(xué)模型進行驗證,含沙量、水沙通量以及淤積結(jié)果均與實測值吻合良好,表明本文所建立三維泥沙數(shù)學(xué)模型能較好地反映長江口深水航道工程附近海域的水流、泥沙運動特性。在此基礎(chǔ)上,分析了懸沙以及浮泥的運動規(guī)律,結(jié)果表明,由邊灘進入航道的浮泥是深水航道淤積的最重要來源。
[Abstract]:The Yangtze Estuary deepwater channel project has played a great economic and social benefit since its construction, but at the same time it is also faced with the problem of large amount of channel siltation and relatively concentrated siltation position. In order to study the regulation of sediment movement in the deep water channel of the Yangtze River Estuary, In this paper, based on FVCOM three-dimensional hydrodynamic model, salinity model, suspended sediment mathematical model and planar two-dimensional sediment model, the water-sediment salinity mathematical model of the Yangtze Estuary deepwater waterway engineering sea area is established. The regularity of sediment movement and siltation mechanism in deep water channel engineering area are studied. The concrete contents and main conclusions of this paper are as follows: 1) the temperature, particle size, sediment content and salinity are considered synthetically. The formula of settling velocity of viscous sediment, which influences the effect of turbulence intensity on flocculation, is obtained by combining with field observation and experimental data to determine some parameters of the formula, which is suitable for the deep-water channel engineering of the Yangtze River Estuary. The range of settling velocity calculated by the formula is basically consistent with the previous research results. (2) according to the mathematical model of hydrodynamic force, salinity and sediment of the Yangtze Estuary Deepwater Channel, The effect of salinity stratification on the hydrodynamic and suspended sediment vertical distribution in the sea area near the Changjiang Estuary is studied and analyzed. The results show that the turbulence suppression caused by density stratification reduces the vertical turbulent viscosity and increases the surface velocity after considering the salinity stratification effect. The velocity of the bottom layer becomes smaller, the vertical average velocity of velocity increases, the stratification of suspended sediment becomes more obvious, the sediment content of the surface layer becomes smaller, and the sediment content of the bottom layer becomes larger. Considering the velocity and sediment concentration distribution of stratification effect, it is more consistent with the measured value. The stratification effect has an important influence on hydrodynamic and sediment movement in the Changjiang Estuary. The results of water and sediment fluxes and siltation are in good agreement with the measured values, which indicates that the 3D sediment mathematical model established in this paper can well reflect the characteristics of water flow and sediment movement in the waters near the Yangtze Estuary Deepwater Channel Project. The movement law of suspended sediment and floating mud is analyzed. The results show that the sediment entering the channel from the banks is the most important source of sediment deposition in the deep water channel.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV148

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊小宸;張慶河;趙洪波;張娜;;浮泥沿航道流動的數(shù)值模擬[J];泥沙研究;2013年04期

2 沈淇;顧峰峰;萬遠(yuǎn)揚;孔令雙;王巍;;長江口洪季北槽深水航道區(qū)域懸沙沉降速度估算[J];海洋工程;2013年02期

3 張金鳳;張慶河;喬光全;;水體紊動對黏性泥沙絮凝影響研究[J];水利學(xué)報;2013年01期

4 馮俊;;浮泥發(fā)育時雙頻回聲測深誤差及其對適航水深監(jiān)測的影響[J];水運工程;2011年08期

5 張卓;孔俊;劉春鋒;;兩種紊流模型在密度分層流中的比較研究[J];海洋科學(xué)進展;2011年02期

6 張飛;王義剛;黃惠明;王玉滴;;長江口主要水道洪季懸沙有效沉速分布研究[J];泥沙研究;2011年02期

7 ;AN APPROACH TO SEPARATING THE CURRENT VELOCITY IN ESTUARINE AND COASTAL WATERS[J];Journal of Hydrodynamics;2009年04期

8 范期錦;高敏;;長江口深水航道治理工程的設(shè)計與施工[J];人民長江;2009年08期

9 鐘建軍;匡翠萍;陳思宇;;長江口粘性細(xì)泥沙有效沉速與相關(guān)因素的關(guān)系[J];人民長江;2008年20期

10 李秀文;何青;;長江口細(xì)顆粒泥沙絮凝問題研究綜述[J];人民長江;2008年06期

相關(guān)博士學(xué)位論文 前5條

1 楊小宸;淤泥質(zhì)海岸浮泥形成與運動的數(shù)學(xué)模型研究[D];天津大學(xué);2014年

2 喬光全;不同因素對粘性泥沙絮凝特性的影響研究[D];天津大學(xué);2013年

3 劉高峰;長江口水沙運動及三維泥沙模型研究[D];華東師范大學(xué);2011年

4 陳斌;長江口附近海域三維懸浮泥沙的數(shù)值模擬研究[D];中國科學(xué)院研究生院（海洋研究所）;2008年

5 堵盤軍;長江口及杭州灣泥沙輸運研究[D];華東師范大學(xué);2007年

相關(guān)碩士學(xué)位論文 前1條

1 李延召;挾沙水流紊流模型對泥沙擴散系數(shù)的影響研究[D];清華大學(xué);2008年

，

本文編號：1486224