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系統識別號 U0026-0507201713244500
論文名稱(中文) 階梯深潭形成對河道影響之研究
論文名稱(英文) NUMERICAL AND EXPERIMENTAL STUDY ON FORMATION AND EFFECTS OF STEP-POOLS
校院名稱 成功大學
系所名稱(中) 水利及海洋工程學系
系所名稱(英) Department of Hydraulics & Ocean Engineering
學年度 105
學期 2
出版年 106
研究生(中文) 黃林願
研究生(英文) Huynh Lam Nguyen
電子信箱 nguyenhuynh.info@gmail.com
學號 N86047016
學位類別 碩士
語文別 英文
論文頁數 110頁
口試委員 口試委員-詹錢登
口試委員-梁文盛
指導教授-王筱雯
中文關鍵字 none 
英文關鍵字 Step-pool formation  FLOW-3D model  Artificial steps  Sediment feeding 
學科別分類
中文摘要 None
英文摘要 The demand for stream restoration utilizing step-pools sequences is increasingly due to urban developments, population pressure, land-use changes in recent years. Fundamental formation mechanism of step-pool channels, nonetheless, is so far still a subject of controversy since there are two different general schools of thought on it. Also, insufficient understanding of artificial step-pools resulted in failure and inefficiency of many river restoration projects. In order to find out actual formation mechanism of step-pool channels as well as verify capability of a three-dimensional model for modelling of step-pool morphology, FLOW-3D model is used to compare, calibrate and validate based on experimental results. Moreover, 26 physical experiments are conducted to investigate effects of artificial steps, H/L/S ratio, step configuration, step density and upstream sediment transport on stability of steps, sediment transport rate, longitudinal profile, energy dissipation and flow resistance. Calibration and validation results showed that FLOW-3D has ability to be used in simulation of step-pool channels and both random location of keystones and mesh size play important roles in step-pool morphology formation. Besides, the numerical model revealed that most of existing Shields diagrams and bedload transport models are inappropriate for mountainous sediment usually characterized by big size materials. Analyses of experimental results demonstrated in most of runs, constructed artificial steps were stable even at the largest discharge level and artificial steps contributed to stabilize channel bed better than without steps. Furthermore, value 1 of H/L/S ratio and V-shape configuration provided the highest performance, simultaneously, the higher step density, the better results of energy dissipation and flow resistance. While coarse sediment feeding resulted in instability and burial of the first step and pool in some runs, impacts of fine sediment feeding and flow were not strong enough to move or oscillate any component of the artificial steps. Channel bed, nevertheless, was substantially stabilized in both coarse and fine sediment feeding. Especially, a great potential of artificial steps for flooding mitigation was explored since peak of sediment transport during coarse sediment feeding was much retarded.
論文目次 ABSTRACT ..........I
ACKNOWLEDGEMENTS .......··II
TABLE OF CONTENTS ........·III
LIST OF TABLES ......... V
LIST OF FIGURES........· VI
CHAPTER ONE INTRODUCTION .......·· 1
1.1 Background of study........·· 1
1.2 Research motivation and purpose .....·· 2
1.3 Thesis structure ........·· 3
CHAPTER TWO LITERATURE REVIEW..... 4
2.1 Effects of step-pool channels .......· 4
2.2 Natural formation of step-pool channels ..... 5
2.3 Application of artificial step-pools.....· 7
CHAPTER THREE METHODOLOGY ......· 9
3.1 Numerical modelling ........· 9
3.1.1 Data collection........ 9
3.1.2 Introduction to FLOW-3D model......·16
3.1.3 Governing equations .......·17
3.1.4 Modelling procedure.......·18
3.1.5 Sediment scour model ......··22
3.1.6 Geometry .........··29
3.1.7 Meshing........·34
3.1.8 Material data ........·40
3.1.9 Boundary conditions .......·41
3.1.10 Turbulence model .......·42
3.1.11 Model calibration and validation.....··43
3.2 Physical experiments ........50
3.2.1 Experimental equipment .......··50
3.2.2 Experimental procedure ......50
3.2.3 Experimental design .......·52
3.2.4 Assessment criteria........61
CHAPTER FOUR RESULTS AND DISCUSSION.....··64
4.1 Calibration results .......·64
4.1.1 Errors summary.......·64
4.1.2 Sediment transport rate ......·65
4.1.3 Longitudinal profile.......··66
4.1.4 Bed elevation deviation ......67
4.1.5 Average velocity and water depth ......68
4.1.6 Total packed sediment and packed sediment species changes .·69
4.2 Validation results.......··72
4.2.1 Summary of errors ........72
4.2.2 Sediment transport rate ......·72
4.2.3 Longitudinal profile.......··72
4.2.4 Bed elevation deviation ......74
4.2.5 Average velocity and water depth ......74
4.3 Artificial step-pool results ......75
4.3.1 Stability and sediment transport rate .....75
4.3.2 Effect of artificial steps......·77
4.3.3 H/L/S ratio .........80
4.3.4 Step configuration........·81
4.3.5 Step-pool sequences .......·82
4.4 Sediment feeding results ......··84
4.4.1 Coarse sediment feeding .......··84
4.4.2 Fine sediment feeding ......··90
4.5 Lacking of step-pool morphology.....·94
4.5.1 Unsatisfactory mesh size .......··94
4.5.2 Random location of keystone......97
4.6 Limitation of FLOW-3D model ......97
CHAPTER FIVE CONCLUSIONS......98
5.1 Conclusions .........··98
5.2 Suggestions.........· 101
REFERENCES .........·· 103
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