Effect of suction on local scour downstream of a rigid structure

The influence of suction at the downstream of a fixed apron was investigated in a laboratory flume. Experiments were conducted at a fixed water depth with varying flow rate and suction rate at fixed suction position. The results clearly show that suction has an adverse effect in increasing the depth...

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Main Author: Chew, Jing Xuan
Other Authors: Chiew Yee Meng
Format: Final Year Project
Language:English
Published: 2016
Subjects:
Online Access:http://hdl.handle.net/10356/68902
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-689022023-03-03T17:22:08Z Effect of suction on local scour downstream of a rigid structure Chew, Jing Xuan Chiew Yee Meng School of Civil and Environmental Engineering Dr. Yeh Po-Hung DRNTU::Engineering::Civil engineering::Water resources The influence of suction at the downstream of a fixed apron was investigated in a laboratory flume. Experiments were conducted at a fixed water depth with varying flow rate and suction rate at fixed suction position. The results clearly show that suction has an adverse effect in increasing the depth of scour hole downstream of the apron in all the experiments. The adverse effect is obvious even with low channel flow. However, there exist instability in low channel flow runs, where the dimensionless graphical data reveals that they do not fit in the trend of runs with higher flow rate. For other runs with varying suction rate, the 2-D scour profile generally follows the suction rate; higher suction results in deeper scour depth. However, at low suction rate, the scour depth does not coincide with the magnitude of suction rate. There is significant distinct difference for very low suction rate runs of as low as 0.029% of channel flow rate, as compared to non-suction runs. In another words, it tells us that only a minute suction is required to generate produce the suction effect on the sediment. Bachelor of Engineering (Civil) 2016-07-18T06:33:39Z 2016-07-18T06:33:39Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/68902 en Nanyang Technological University 37 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Water resources
spellingShingle DRNTU::Engineering::Civil engineering::Water resources
Chew, Jing Xuan
Effect of suction on local scour downstream of a rigid structure
description The influence of suction at the downstream of a fixed apron was investigated in a laboratory flume. Experiments were conducted at a fixed water depth with varying flow rate and suction rate at fixed suction position. The results clearly show that suction has an adverse effect in increasing the depth of scour hole downstream of the apron in all the experiments. The adverse effect is obvious even with low channel flow. However, there exist instability in low channel flow runs, where the dimensionless graphical data reveals that they do not fit in the trend of runs with higher flow rate. For other runs with varying suction rate, the 2-D scour profile generally follows the suction rate; higher suction results in deeper scour depth. However, at low suction rate, the scour depth does not coincide with the magnitude of suction rate. There is significant distinct difference for very low suction rate runs of as low as 0.029% of channel flow rate, as compared to non-suction runs. In another words, it tells us that only a minute suction is required to generate produce the suction effect on the sediment.
author2 Chiew Yee Meng
author_facet Chiew Yee Meng
Chew, Jing Xuan
format Final Year Project
author Chew, Jing Xuan
author_sort Chew, Jing Xuan
title Effect of suction on local scour downstream of a rigid structure
title_short Effect of suction on local scour downstream of a rigid structure
title_full Effect of suction on local scour downstream of a rigid structure
title_fullStr Effect of suction on local scour downstream of a rigid structure
title_full_unstemmed Effect of suction on local scour downstream of a rigid structure
title_sort effect of suction on local scour downstream of a rigid structure
publishDate 2016
url http://hdl.handle.net/10356/68902
_version_ 1759855022541111296