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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 周逸儒(Yi-Ju Chou) | |
dc.contributor.author | Chien-Yung Tseng | en |
dc.contributor.author | 曾鈐雍 | zh_TW |
dc.date.accessioned | 2021-06-15T13:48:06Z | - |
dc.date.available | 2015-12-01 | |
dc.date.copyright | 2015-12-01 | |
dc.date.issued | 2015 | |
dc.date.submitted | 2015-11-10 | |
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Reviews of geophysics and space physics 20.4 (1982): 851-875. [26] Ming, Xu, and Vivien P. Chua. 'Three-dimensional hydrodynamic modeling of Singapore coastal waters on an unstructured-grid SUNTANS model.' OCEANS 2014-TAIPEI. IEEE, 2014. [27] Parker, Gary, et al. 'Experiments on turbidity currents over an erodible bed.'Journal of Hydraulic Research 25.1 (1987): 123-147. [28] Paull, C. K., et al. 'Caught in the act: the 20 December 2001 gravity flow event in Monterey Canyon.' Geo-Marine Letters 22.4 (2002): 227-232. [29] Simpson, John E. Gravity currents: In the environment and the laboratory. Cambridge University Press, 1999. [30] Simpson, John E. 'Gravity currents in the laboratory, atmosphere, and ocean.'Annual Review of Fluid Mechanics 14.1 (1982): 213-234. [31] Winterwerp, J. C., et al. 'A heuristic formula for turbulence-induced flocculation of cohesive sediment.' Estuarine, Coastal and Shelf Science 68.1 (2006): 195-207. [32] Xu, J. P., M. A. Noble, and Leslie K. Rosenfeld. 'In‐situ measurements of velocity structure within turbidity currents.' Geophysical Research Letters 31.9 (2004). [33] 施宗緯 (Shih, T. W.) (2013). “三維非結構性網格河口模式在高雄港水動力模擬的開發與應用” 台灣大學工學院應用力學研究所碩士論文 [34] 陳聖堯 (Chen, S. Y.) (2014). “含沙異重流之紊流解析模擬” 台灣大學工學院應用力學研究所碩士論文 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51756 | - |
dc.description.abstract | 本研究利用三維高解析度沿岸海洋模式“SUNTANS”配合Chen et al. [2013]所設置之大尺度的理想地形來模擬並分析含沙異重流(hyperpycnal plume)在不同斜坡上的運動行為。為特別了解含沙異重流在潛入區附近的動力情形,我們設置河口附近的網格較為細密。另外,為了模擬真實的洪水案例,我們將河道的入流設置為2 m ,河川的泥沙濃度為50 g 。
經過初步比對,模擬的異重流速度剖面圖與捲水係數和前人的實驗結果一致。而模擬的結果顯示,非靜水狀態的壓力(nonhydrostatic pressure)在潛入區相當重要,若僅利用靜水狀態近似(hydrostatic approximation)來模擬此一區域異重流的運動行為則結果會與實際的物理量有所差異。此外,我們探討了不同坡度下異重流的運動情形並且發現在潛入區所計算得到的捲水效應在坡度越陡的狀況下會顯得更加強烈。透過能量收支分析,我們初步了解了含沙異重流在不同坡度下運動時的各種能量貢獻情形與分佈,並比對在利用靜水壓近似及考慮非靜水壓力時模擬結果的差異。 | zh_TW |
dc.description.abstract | A three-dimensional high-resolution nonhydrostatic coastal model, SUNTANS, is used to study the dynamics and structure of turbidity currents on sloping continental shelves with an idealized domain setup (Chen et al. 2013). To focus on the plunging region, the grid resolution is refined near the river mouth. The sediment concentration is specified as 50 g at the river inflow with 2 m inflow velocity to simulate the real mountainous river systems during different flood events. The model derived vertical velocity profiles and entrainment rates are consistent with the prior laboratory experiments. Compared with the hydrostatic modeling, our results show that the nonhydrostatic effect is especially important in the plunging region, while it is insignificant in the body region. We also apply three different slopes of the continental shelves in the simulation to understand how the slope change will affect plunging dynamics of the turbidity current. Moreover, the entrainment rate near the plunging region is examined with different slopes and the analysis of energy budget is conducted to investigate the spatial and temporal evolution of kinetic and potential energy associated with plunging. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T13:48:06Z (GMT). No. of bitstreams: 1 ntu-104-R02543002-1.pdf: 4879377 bytes, checksum: bc6ce9739afd7d47c08d4b383ee003c5 (MD5) Previous issue date: 2015 | en |
dc.description.tableofcontents | 口試委員會審定書 i
Acknowledgments ii 中文摘要 iii Abstract iv List of Figures vii List of Tables xii Chapter 1 Introduction 1 1.1 Laboratory experiments and field studies 3 1.2 Numerical Modeling 4 1.3 The Plunging Region 6 Chapter 2 Numerical Setup 8 2.1 Domain Setup 8 2.2 Numerical Model 9 2.3 Initial Conditions 12 Chapter 3 Model Validation 13 3.1 Vertical Profiles 13 3.2 Entrainment Estimation 14 Chapter 4 The Nonhydrostatic Effect of Plunging Dynamics 17 4.1 Nonhydrostatic Effect in SSC and Velocity Field 17 4.2 Entrainment Rate and Eddy Diffusivity 22 4.3 Resolution Study for the Nonhydrostatic Simulation 24 4.3.1 Coarse grid result 25 4.3.2 Numerical Diffusion Coefficient 26 4.3.3 Numerical Diffusion and the Nonhydrostatic Pressure 28 4.4 Summary 30 Chapter 5 The Plunging Dynamics on Different Slopes 31 5.1 Plume Behavior on different slopes 31 5.1.1 The transect plots of hyperpycnal plumes on different slopes 31 5.1.2 The plane view plots of hyperpycnal plumes on different slopes 34 5.2 Entrainment Analysis 38 5.3 Summary 40 Chapter 6 Energy Budget Analysis 41 6.1 Derivation 41 6.2 Comparison of Different Slopes 43 6.2.1 Plane view depth-integrated energy budget 43 6.2.2 Sectional-integrated energy budget 45 6.2.3 Depth-integrated energy budget along the line y = 0 46 6.3 Nonhydrostatic Comparison 48 Chapter 7 Conclusions and Discussion 50 7.1 Conclusions 50 7.1.1 Nonhydrostatic effect 50 7.1.2 Plume dynamics on different slopes 51 7.2 Discussion 52 Reference 54 | |
dc.language.iso | en | |
dc.title | 陸棚含沙異重流之非靜水壓數值研究 | zh_TW |
dc.title | Non-hydrostatic Numerical Study of Hyperpycnal River Plumes on Sloping Continental Shelves | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 戴璽恆(Albert Dai),黃志誠(Zhi-Cheng Huang),賴悅仁(Steven Lai) | |
dc.subject.keyword | 含沙異重流,沿岸海洋模式,非靜水壓,潛入區,捲水效應,能量收支, | zh_TW |
dc.subject.keyword | hyperpycnal plume,SUNTANS coastal ocean model,nonhydrostatic,plunging,entrainment,energy budget, | en |
dc.relation.page | 57 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2015-11-11 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 應用力學研究所 | zh_TW |
顯示於系所單位: | 應用力學研究所 |
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