本文選題：浮泥 + 水動力-粘性泥沙耦合模型��； 參考：《天津大學》2014年博士論文

【摘要】：淤泥質河口海岸地區(qū)，浮泥是一種比較常見的具有特殊流變特性和高流動性的泥沙運動形態(tài)，浮泥的形成和運動對淤泥質海岸港口和航道淤積等實際問題具有重要影響。為此，本文針對浮泥的形成和運動過程，首先基于有限體積法建立了三維水動力-粘性泥沙耦合模型為描述浮泥的形成過程奠定基礎，然后建立一維浮泥運動模型并在此基礎上建立了三維水動力-平面二維浮泥雙層模型描述浮泥的運動過程，最后結合大氣模型、波浪模型以及模型耦合工具，建立了風-浪-流-粘性泥沙-浮泥集成模型。該集成模型進一步應用于研究不同風浪條件對典型淤泥質海岸連云港浮泥形成和運動以及航道淤積的影響。本文的具體研究內容和主要結論如下： （1）基于有限體積法建立了波、流共同作用下的三維水動力-粘性泥沙耦合模型，模型考慮了粘性泥沙懸揚運動過程的各種影響因素及水動力和粘性泥沙間的相互影響。選取相關實驗數(shù)據(jù)對模型進行了驗證，結果表明模型能夠較合理地描述水動力和粘性泥沙運動，為合理模擬浮泥的形成奠定基礎。 （2）推導了非牛頓流體摩阻系數(shù)，并將摩阻系數(shù)表達式引入到基于淺水方程的一維浮泥運動有限差分模型中計算浮泥與底部床面間的摩阻力，模型的合理性獲得實驗驗證。 （3）結合三維水動力-粘性泥沙耦合模型和一維浮泥運動模型的研究成果，建立了基于有限體積法的非結構化網(wǎng)格三維水動力-平面二維浮泥雙層模型，描述粘性泥沙落淤形成浮泥及浮泥的運動過程，同時考慮浮泥和水體間的相互影響。模型模擬上部水體和底部浮泥運動的能力獲得相關實驗驗證。 （4）河口海岸地區(qū)動力因素復雜，在臺風等惡劣氣候條件下可能在航道和港池中形成驟淤，結合水動力-浮泥雙層模型、大氣模型、波浪模型和模型耦合工具，，建立了三維風-浪-流-粘性泥沙-浮泥集成模型，并將模型應用于臺風及大風期間連云港海域的水動力、泥沙、浮泥運動和航道淤積模擬。 （5）以典型淤泥質海岸連云港為例，應用建立的集成模型研究不同風浪條件對連云港海域浮泥形成和航道淤積的影響。結果表明大風作用產(chǎn)生強浪，使底部泥沙大量懸浮并在動力條件較弱的航道中落淤，是產(chǎn)生浮泥和航道淤積的重要原因。
[Abstract]:In the muddy estuarine and coastal area, floating mud is a kind of sediment movement which has special rheological characteristics and high fluidity. The formation and movement of mud have an important effect on the silting of silt coastal ports and waterways. Therefore, in this paper, a three-dimensional hydrodynamic and viscous sediment coupling model is established based on the finite volume method to describe the formation process of the floating mud. Based on the model, a three-dimensional hydrodynamic-plane two-layer model is established to describe the motion process of the slime. Finally, combined with the atmospheric model, the wave model and the coupling tool of the model, a two-layer model is developed to describe the motion of the slime. An integrated wind-wave-flow-viscous sediment-mud model is established. The integrated model is further applied to study the influence of different wind and wave conditions on the formation and movement of floating mud in Lianyungang, a typical muddy coast, and the siltation of waterway. The main research contents and main conclusions are as follows: (1) based on the finite volume method, a three-dimensional hydrodynamic and viscous sediment coupling model under the interaction of wave and current is established. The model takes into account various factors affecting the suspended movement of viscous sediment and the interaction between hydrodynamic and viscous sediment. The relevant experimental data are selected to verify the model. The results show that the model can reasonably describe hydrodynamic and viscous sediment movements, and lay a foundation for reasonable simulation of the formation of floating mud. (2) the friction coefficient of non-Newtonian fluids is derived. The expression of friction coefficient is introduced to the finite difference model of one-dimensional slime motion based on shallow water equation to calculate the friction between the floating mud and the bottom bed. The rationality of the model is verified by experiments. (3) combined with the results of three-dimensional hydrodynamic and viscous sediment coupling model and one-dimensional sediment motion model, Based on finite volume method, a three-dimensional hydrodynamic-plane two-layer model of unstructured meshes is established to describe the motion process of slime and mud formed by viscous sediment deposition, and the interaction between sediment and water is taken into account. The ability of the model to simulate the movement of upper water and bottom mud has been verified by relevant experiments. (4) the dynamic factors in estuarine and coastal areas are complex, and sudden siltation may be formed in waterways and harbor ponds under severe weather conditions such as typhoons. A three dimensional integrated model of wind, wave, current, viscous sediment and mud is established by using the coupled tools of hydrodynamic double layer model, atmospheric model, wave model and model. The model is applied to the hydrodynamics of Lianyungang sea area during typhoon and strong wind. (5) taking the typical silt coast Lianyungang as an example, the integrated model was established to study the influence of different wind and wave conditions on the formation of sediment and channel deposition in Lianyungang sea area. The results show that the strong waves caused by the strong wind cause a large amount of sediment suspended at the bottom and silt fall in the channel with weak dynamic conditions, which is an important reason for the silt and channel siltation.
【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TV148

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