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標題: Experiments and Simulations of Live-Bed Pier Scour under Steady and Unsteady Flow Conditions
作者: 楊超傑
Chao-Chieh Yang
關鍵字: 動床;變量流;局部沖刷深度;橋墩沖刷;Live-Bed;Unsteady Flow;Local Scour Depth;Pier Scour
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This paper aims to observe temporal evolutions of pier scour in live-bed condition in order to understand nature channel pier-scour. Five groups of steady flow experiments are designed in different flow intensities varied from 1.18 to 2.21. To find out the effects of unsteady flow on scour depth, different steady flow intensities were combined as four groups of unsteady flow experiments, including: (1) advanced hydrograph, (2) delayed hydrograph, (3) symmetric hydrograph and (4) symmetric hydrograph with low peak.Temporal evolutions of pier scour are recorded by camera set up in experimental pier.Unsteady flow scour depth hydrographs were verified by constant flow hydrograph in different flow intensities. All experiments were set in live-bed requirement to approach the nature condition of pier-scour during flood. This research also use a semi-empirical modle proposed by Hong (2014) to calculate the experiment pier-scour depth varied with time. The semi-empirical equation was used to calculate the change of scour depth obtain from experiments. This research also combined steady flow scour depth hydrograph to discuss whether it can simulate unsteady flow hydrograph or not. Simulation and experiment result may have phase difference because of the difference between dune migration rate. As result,scour depth error calculate from simulation and experiment are less than 10%.The propose model gives reasonable explanation on the variations of cylinder pier-scour depth with time under unsteady flow.
其他識別: U0005-2608201516015700
Rights: 同意授權瀏覽/列印電子全文服務,2015-08-27起公開。
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