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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 卡艾瑋(Herve Capart) | |
dc.contributor.author | Chin-Yang Huang | en |
dc.contributor.author | 黃晉揚 | zh_TW |
dc.date.accessioned | 2021-06-17T06:00:19Z | - |
dc.date.available | 2022-02-14 | |
dc.date.copyright | 2019-02-14 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2019-02-12 | |
dc.identifier.citation | Armanini, A., Capart, H., Fraccarollo, L., and Larcher, M. (2005). Rheological stratification in experimental free-surface flows of granular-liquid mixtures, J. Fluid Mech., 532, 269-319.
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(2015). Cross-sectional imaging of refractive-indexmatched liquid-granular fows. Exp Fluids 56:163 Ni, W.-J. and Capart, H. (2018) Stresses and drag in turbulent bed-load from refractive-index-matched experiments. Geophysical Research Letters, in press, GRL57678. Ovarlez, G., Bertrand, F., and Rodts, S. (2006). Local determination of the constitutive law of a dense suspension of noncolloidal particles through magnetic resonance imaging. J. Rheol. 50, 259–292. Perng, A. T. H., H. Capart, and H. T. Chou (2006). Granular configurations, motions, and correlations in slow uniform flows driven by an inclined conveyor belt, Granular Matter, 8, 5 – 17. Pope, S. B. (2000). Turbulent flows. Cambridge, Cambridge University Press. Pugh, F. J., and Wikson, K. C. (1999). Velocity and concentration distributions in sheet flow above plane beds, J. Hydraul. Eng., 125(2), 117–125. Revil-Baudard, T., and Chauchat, J. (2013). A two-phase model for sheet flow regime based on dense granular flow rheology. J. Geophys. Res. 118, 619–634. Revil-Baudard, T., Chauchat, J., Hurther, D., and Barraud, P.-A. (2015). Investigation of sheet-flow processes based on novel acoustic highresolution velocity and concentration measurements, J. Fluid Mech., 767, 1–30. Savage, S. B. & Jeffrey, D. J. (1981). The stress tensor in a granular flow at high shear rates. J. Fluid Mech. 110, 255–272. Smart, GM. (1984). Sediment transport formula for steep channels. J. Hydraul. Eng.110, 267–276. Spinewine, B., and Capart, H. (2013). Intense bed-load due to a sudden dam-break. Journal of Fluid Mechanics, 731, 579–614. Spinewine, B., Capart, H., Fraccarollo, L., and Larcher, M. (2011). Laser stripe measurements of near‐wall solid fraction in channel flows of liquid‐granular mixtures, Exp. Fluids, 50(6), 1507–1525. Sumer, B. M., Kozakiewicz, A., Fredsøe, J., and Deigaard, R. (1996). Velocity and concentration profiles in sheet‐flow layer of movable bed, J. Hydraul. Eng., 122(10), 549–558. Wu, F. C. and Yang, K. H. (2004). Entrainment probabilities of mixed-size sediment incorporating near-bed coherent flow structures, J. Hydraul. Eng., 130, 1187–1197. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71414 | - |
dc.description.abstract | 本論文致力於探討礫石流在狹長山谷中之發展機制。透過小尺度的長渠道試驗,模擬在高流量之供給條件下,引致顆粒流湧浪行經鬆軟底床之運動行為。透過影像分析方法可同步計算實驗量測值,主要分為流速及礫石濃度。
我們採用雷射條紋濃度法計算實驗濃度值,在濕顆粒流中,建立礫石濃度與光線可穿透距離之關係,進而得到沿深度變化之濃度曲線;流速方面,則是採用質點軌跡測速法,計算自由液面以下之實驗流速值。以實驗量測值作為基礎,透過控制體積法推算底床剪應力,並比較其與流速、礫石濃度、礫石通量、底床載厚度、正向應力,及顆粒有效應力等參數。結果顯示,邊界磨損效應對濕顆粒流的影響相當有限。當底床剪應力增加時,其對顆粒運動造成影響之變化率約與深度呈拋物線關係。 理論方面,我們以應力平衡為基礎,採用垂直擴散理論,推導在顆粒流湧浪中,礫石濃度隨深度變化之情形。將理論模式應用至實驗,當水位、運動層厚度,及初始底床高程為已知變數時,可預測礫石濃度及應力分布隨深度之變化,並能成功表現在實驗結果中所發現之應力關係。透過實驗比較,可驗證模式準確性,並檢視理論與實驗之間之現象差異。 | zh_TW |
dc.description.abstract | The purpose of the study is to explore the transport mechanism of the debris flow developing in a narrow valley. We conduct small-scale laboratory experiments to simulate the behavior of the flood-induced liquid-granular surge flowing over the loose erodible bed. Via image processing methods, the experimental measurements of velocities and grain concentrations can be simultaneously calculated from the same footage. Grain concentrations are calculated adopting the laser distance-to-wall measurements, based on the relation between the grain concentration and the mean maximum travelling distance of laser beam. Velocities below the free surface are calculated adopting particle tracking velocimetry (PTV). The experimental basal shear stresses are solved via control volume analysis. The results show that when basal shear stresses increase, the wall abrasion behavior can be neglected, which intensifies following a cubic relationship with depth. In theory, we adopt the diffusive flux approach with a diffusivity in terms of the granular pressure to derive the analytical solution for grain concentration profile. The model requires the water level, the bed-load layer thickness, and the initial deposited bed level, as known variables. Besides, the analytical solution can be used to described the relations of stresses with depth earlier found in experiments. The model are compared with experimental measurements to observe the difference between the theory and experiments. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T06:00:19Z (GMT). No. of bitstreams: 1 ntu-107-R05521308-1.pdf: 23973554 bytes, checksum: 43ec0ad0f3c18d949090796a54703f07 (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 口試委員會審定書 I
摘要 I Abstract III Contents V List of Symbols VIII List of Figures XI List of Tables XXV Chapter 1 Introduction 1 1.1 Background and motivation 1 1.2 Objectives 4 1.3 Research scheme 6 Chapter 2 Liquid-granular Flow Experiments 7 2.1 Experimental set-up 7 2.2 Measurement instrumentation 11 2.3 Particle material 13 2.4 Experiment procedure 19 Chapter 3 Image Processing Methods 27 3.1 Camera calibration 27 3.2 Particle capturing 31 3.3 Particle tracking 33 3.4 Laser distance-to-wall measurements 39 3.5 Conversion from distance-to-wall to concentration 44 Chapter 4 Experimental Results and Comparisons 47 4.1 Experiment case 47 4.2 Particle tracking results 50 4.3 Depth profile results 53 4.4 Discussion 81 Chapter 5 Granular Transport Analysis 83 5.1 Boundary analysis 83 5.2 Control volume analysis 85 5.2.1 Volume balance 85 5.2.2 Conservation mass balance 86 5.2.3 Longitudinal momentum balance 96 5.2.4 Stress results in liquid granular surge experiments 100 5.2.5 Stress results in intense bed-load experiments 105 5.2.6 Discussion 110 Chapter 6 Vertical Structure Analysis 113 6.1 Dimensionless parameters 113 6.2 Bed-load layer thickness relation 115 6.2.1 Relation in liquid-granular surge experiments 115 6.2.2 Relation in uniform bed-load experiments 116 6.2.3 Relation in uniform bed-load experiments without shifting 117 6.2.4 Discussion 118 6.3 Bed-load transport relation 120 6.3.1 Relation in liquid-granular surge experiments 120 6.3.2 Relation in uniform bed-load experiments 121 6.3.3 Relation in uniform bed-load experiments without shifting 122 6.3.4 Discussion 123 6.4 Experimental measurements for transport analysis 124 Chapter 7 Vertical Structure Modeling and Comparison 129 7.1 Analytical solution for grain concentration profile 130 7.1.1 Bagnold’s bed-load 130 7.1.2 Coulomb yield criterion 131 7.1.3 A diffusive flux approach 133 7.1.4 Basal level of the bed-load layer 138 7.2 Analytical solution for granular pressure profile 153 7.3 Analytical solution for shear stress profile 156 7.4 Discussion 161 Chapter 8 Conclusion 163 Reference 167 | |
dc.language.iso | en | |
dc.title | 顆粒流湧浪於動床渠道之流動結構:理論及實驗方法 | zh_TW |
dc.title | Vertical structure of liquid-granular surges over erodible beds: experiments and theory | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 吳富春(Fu-Chun Wu),周憲德(Hsien-ter Chou),Luigi Fraccarollo | |
dc.subject.keyword | 顆粒流湧浪,質點軌跡測速法,雷射條紋濃度量測法,底床剪應力,礫石濃度理論, | zh_TW |
dc.subject.keyword | liquid-granular surge,particle tracking velocimetry,laser distance-to-wall measurements of solid fraction,basal shear stress,analytical solution for grain concentrations, | en |
dc.relation.page | 170 | |
dc.identifier.doi | 10.6342/NTU201900463 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-02-12 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
顯示於系所單位: | 土木工程學系 |
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