Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor

Protruding clast that having low relative submergence was among the vital morphological features found on the mountain rivers in Malaysia. The protrusion of these grains is expected to have significant influence on the turbulent flow field and bed load transport.A field study was conducted to examin...

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Main Author:	Shukor, Mohd Rizal
Format:	Thesis
Language:	English
Published:	2014
Online Access:	https://ir.uitm.edu.my/id/eprint/16332/1/TM_MOHD%20RIZAL%20SHUKOR%20EC%2014_5.pdf
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id	my-uitm-ir.16332
record_format	uketd_dc
spelling	my-uitm-ir.163322022-03-29T07:32:56Z Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor 2014-04 Shukor, Mohd Rizal Protruding clast that having low relative submergence was among the vital morphological features found on the mountain rivers in Malaysia. The protrusion of these grains is expected to have significant influence on the turbulent flow field and bed load transport.A field study was conducted to examine the turbulent properties of the flow around naturally formed protruding cobbles at mountain river reach namely Rasil River. The application of Acoustic Doppler Velocimeter (ADV) was adopted in this study as to measure three-dimensional velocity components (stream-wise, vertical and span-wise) at high frequency measurement. Bed shear stress which is the fundamental variable to link flow conditions to bed load transport was used to characterize the turbulent flow field in this study. Overlay Analysis in GIS was used as a tool to graphically evaluate performance of bed shear stress in bed load transport study. The initial result from bed shear stress reveals that protruding cobble hadsignificantly modified the turbulent flow structure. High magnitude of bed shear stress that corresponds with the prevalent bed load transport activities was found to be concentrated on lower bed elevation zone. On the other hand, sheltering effect existed on the zone behind the protruding cobble thus result in weak or zero bed load transport actions. The derived critical bed load transport zones then were further confirmed by the zonation of sweeps and ejections event from turbulent bursting cycle. The most transported bed load was found to be coincided with high magnitude of sweeps and ejections events. It is evident that river hydraulic survey needs to be done first to identify the most transported bed load zones before deploying bed load sampler to get an accurate measurement of bed load transport. Deploying the sampler on the right locations may help to reduce error in measurement so that river bed erosion can be monitored wisely. 2014-04 Thesis https://ir.uitm.edu.my/id/eprint/16332/ https://ir.uitm.edu.my/id/eprint/16332/1/TM_MOHD%20RIZAL%20SHUKOR%20EC%2014_5.pdf text en public mphil masters Universiti Teknologi MARA Faculty of Civil Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
description	Protruding clast that having low relative submergence was among the vital morphological features found on the mountain rivers in Malaysia. The protrusion of these grains is expected to have significant influence on the turbulent flow field and bed load transport.A field study was conducted to examine the turbulent properties of the flow around naturally formed protruding cobbles at mountain river reach namely Rasil River. The application of Acoustic Doppler Velocimeter (ADV) was adopted in this study as to measure three-dimensional velocity components (stream-wise, vertical and span-wise) at high frequency measurement. Bed shear stress which is the fundamental variable to link flow conditions to bed load transport was used to characterize the turbulent flow field in this study. Overlay Analysis in GIS was used as a tool to graphically evaluate performance of bed shear stress in bed load transport study. The initial result from bed shear stress reveals that protruding cobble hadsignificantly modified the turbulent flow structure. High magnitude of bed shear stress that corresponds with the prevalent bed load transport activities was found to be concentrated on lower bed elevation zone. On the other hand, sheltering effect existed on the zone behind the protruding cobble thus result in weak or zero bed load transport actions. The derived critical bed load transport zones then were further confirmed by the zonation of sweeps and ejections event from turbulent bursting cycle. The most transported bed load was found to be coincided with high magnitude of sweeps and ejections events. It is evident that river hydraulic survey needs to be done first to identify the most transported bed load zones before deploying bed load sampler to get an accurate measurement of bed load transport. Deploying the sampler on the right locations may help to reduce error in measurement so that river bed erosion can be monitored wisely.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Shukor, Mohd Rizal
spellingShingle	Shukor, Mohd Rizal Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor
author_facet	Shukor, Mohd Rizal
author_sort	Shukor, Mohd Rizal
title	Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor
title_short	Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor
title_full	Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor
title_fullStr	Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor
title_full_unstemmed	Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor
title_sort	critical bed load transport zones in the presence of stable clast / mohd rizal shukor
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Civil Engineering
publishDate	2014
url	https://ir.uitm.edu.my/id/eprint/16332/1/TM_MOHD%20RIZAL%20SHUKOR%20EC%2014_5.pdf
_version_	1783733505998454784

Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor

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