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研究生: 阮黎莊
Trang, Nguyen Le
論文名稱: 泥沙沿著渠槽流動與堆積之實驗研究
Experimental Study on Flow and Deposition Behaviors of Sediment on Flume Connected With A Flat Tank
指導教授: 詹錢登
Jan, Chyan-Deng
學位類別: 碩士
Master
系所名稱: 工學院 - 水利及海洋工程學系
Department of Hydraulic & Ocean Engineering
論文出版年: 2020
畢業學年度: 109
語文別: 英文
論文頁數: 63
外文關鍵詞: Laboratory Flume, Sediment, Flow Behavior, Deposition Behavior
相關次數: 點閱:65下載:3
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  • Development of granular flow is widely characterized by the initiation phase, transportation phase, and deposition phase, depending on slope of channel, total weight of sediment, and surface roughness on channel bed and deposition area. In order to design a granular flow control structure, exact measurement of the flow and deposition behaviors is required through parameters as flow of velocity and depth, runout distance and position of deposition pattern in width, length, and height.
    Therefore, a small-scale flume transparent plastic has been designed in this study to simulate and measure paraneters of the flow and deposition behaviors of sediment through experiments. A flume with 0.15 m (width), 0.2 m (height), and 2.0 m (length) in size has been used to conduct the experiments with a flume slope of 25°, 30°, 35°, and 40°; The flume bed and a flat tank were controlled with different roughness by sandpapers P400, P800, and P1200; Total weight conditions were also considered is 2.8 kg, 4.2 kg, and 5.6 kg. Velocity and depth of flow was estimated by image analysis of photographs, and runout distance in length, width, and height were measured using a flat tank horizontal with 5 mm  5 mm grid was located at the end of flume and a laser measure tool.
    Experiments showed that slope of channel, total weight of sediment, and roughness strongly related to flow behavior through the Froude number, includings velocity of flow as ranging 0.8 - 3.0 m.s-1 and depth of flow, ranging 0.1 - 2.6 cm. With deposition behavior, runout distance in length, width, and height were significantly correlated to flow behavior affected by slope, total weight, and roughness conditions. The runout distance length was much sensitive to Froude number than runout distance width due to flow inertia without surface roughness.

    ABSTRACT I ACKNOWLEDGEMENTS III TABLE OF CONTENT IV LIST OF TABLES VI LIST OF FIGURES VII CHAPTER 1 INTRODUCTION 1 1.1. Research Background 1 1.2. Debris flow definition 2 1.3. Literature review 6 1.4. Physical modelling of debris flows 10 1.4.1. Measurements of debris flows in the field 11 1.4.2. Small-scale physical models 13 CHAPTER 2 SEDIMENT TO BE STUDIED 16 2.1. Materials 16 2.2. Angle of internal friction 17 2.3. Angle of external friction 19 CHAPTER 3 EXPERIMENTS ON INCLINED PLANES 23 3.1. Experiment setup 24 3.2. Experiment procedure 26 CHAPTER 4 RESULTS AND DISCUSSION 30 4.1. Behavior of flow 30 4.1.1. Froude number 30 4.1.2. Velocity of flow 32 4.1.3. Depth of flow 39 4.2. Behavior of deposition 43 4.2.1. Shape of deposition patterns 44 4.2.2. Runout distance of deposition 50 CHAPTER 5 CONCLUSIONS 56 REFERENCES 58 APPENDIX 62

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