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:	http://ir.uitm.edu.my/id/eprint/16332/ http://ir.uitm.edu.my/id/eprint/16332/1/TM_MOHD%20RIZAL%20SHUKOR%20EC%2014_5.pdf

id	uitm-16332
recordtype	eprints
spelling	uitm-163322019-02-20T07:00:15Z http://ir.uitm.edu.my/id/eprint/16332/ Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor 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 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/16332/1/TM_MOHD%20RIZAL%20SHUKOR%20EC%2014_5.pdf Shukor, Mohd Rizal (2014) Critical bed load transport zones in the presence of stable clast / Mohd Rizal Shukor. Masters thesis, Universiti Teknologi MARA.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
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
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
publishDate	2014
url	http://ir.uitm.edu.my/id/eprint/16332/ http://ir.uitm.edu.my/id/eprint/16332/1/TM_MOHD%20RIZAL%20SHUKOR%20EC%2014_5.pdf
first_indexed	2023-09-18T22:55:50Z
last_indexed	2023-09-18T22:55:50Z
_version_	1777417846817554432

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

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