Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia

Marudu Bay lies between the geographical coordinates of 6.9511 °N - 7.0373°N and 116.7420 °E - 117.0339 °E where some part of the Bay is under the Tun Mustapha Park (TMP) area that has been gazetted as Malaysia's largest marine protected area. Rapid coastal development and land clearing for aqu...

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Main Author:	Muhammad Rashid Abdul Rahim
Format:	Thesis
Language:	English English
Published:	2019
Subjects:	GC377-399 Marine sediments
Online Access:	https://eprints.ums.edu.my/id/eprint/32864/5/Characterisrics%20and%20dynamics%20of%20sediment%20at%20Marudu%20Bay%2C%20Sabah%2C%20Malaysia.FULLTEXT.pdf https://eprints.ums.edu.my/id/eprint/32864/2/Characterisrics%20and%20dynamics%20of%20sediment%20at%20Marudu%20Bay%2C%20Sabah%2C%20Malaysia.24pages.pdf
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spelling	my-ums-ep.328642022-06-07T06:40:09Z Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia 2019 Muhammad Rashid Abdul Rahim GC377-399 Marine sediments Marudu Bay lies between the geographical coordinates of 6.9511 °N - 7.0373°N and 116.7420 °E - 117.0339 °E where some part of the Bay is under the Tun Mustapha Park (TMP) area that has been gazetted as Malaysia's largest marine protected area. Rapid coastal development and land clearing for aquaculture activities leads to high sediment discharges that may affect the Bay by damaging its marine resources. Hydrodynamic factor plays an important role in the movement of the sediment within the Bay, and it is affected by river discharge, geomorphology of the bay, bathymetry and tidal constituent. The current study aimed to identify the grain size, distribution, and characteristic of surface sediment at the seabed in inner and outer part of Marudu Bay during northeast, inter-, and southwest monsoon. These data then were simulated for hydrodynamic and sediment dynamic during northeast monsoon via Delft3D simulation model. The model set-up of Delft3D simulation was calibrated and verified using field measurements of data, such as water level, current speed and current direction. The field data for current verification were measured using Acoustic Wave and Current profiler deployed on 12 - 25 March 2015 in the middle of the Bay. The surface sediment and water samples were collected at specific date from 45 stations within the Bay using Ponar grab and horizontal water sampler. Subsequently, the sediment and water samples were then analysed using the LISST-Portable Laser Diffraction Size Analyser and standard method in determination of Total Suspended Sediment (TSS), respectively. The composition of silt and sandy silt (7.92 - 68.18 µm) content in the surface sediment samples from entire Marudu Bay (n=38) was dominant with about 90 % and 40 %, respectively. Sand and silty sand (94.94 - 250 µm) composition present only at the certain area (n=7) with 98 % and 80 %, respectively. Highest TSS value was found at ST26 with 14.1 mg/L which located near Telaga river. Overall from 45 sediment samples obtained at Marudu Bay, for sorting characteristic group; (i) 43 samples were poorly sorted and 2 were well sorted, (ii) 33 samples were under coarse skewed and another 12 under fine skewed, and (iii) 38 samples under mesokurtic and 7 under leptokurtic. The hydraulic movement during the ebb and flood tide were uniforms where the water enters and out from the Bay through Cape of Simpang Mengayau. During spring ebb tide (-0.58 m) the surface sediments from inner and outer part of the Marudu Bay were transported out at the rate of 0.1x106 to 0.2x106 m3/s/m and 0.2x106 to 0.4x106 m3/s/m with a mean current speed of 0.13 m/s. While during spring flood tide (0.28 m), the surface sediments were transported into the Bay at the rate of 0.4x106 to 1.8x106 m3/s/m with a mean current speed of 0.09 m/s. Usage of silt curtain need to be implemented as mitigation measure to minimize the sedimentation. Findings of this present study provide baseline information on sediment transport and hydrodynamic pattern within the Marudu Bay to decisionmakers in developing sustainable aquaculture activities. 2019 Thesis https://eprints.ums.edu.my/id/eprint/32864/ https://eprints.ums.edu.my/id/eprint/32864/5/Characterisrics%20and%20dynamics%20of%20sediment%20at%20Marudu%20Bay%2C%20Sabah%2C%20Malaysia.FULLTEXT.pdf text en validuser https://eprints.ums.edu.my/id/eprint/32864/2/Characterisrics%20and%20dynamics%20of%20sediment%20at%20Marudu%20Bay%2C%20Sabah%2C%20Malaysia.24pages.pdf text en public mphil masters Universiti Malaysia Sabah Borneo Marine Research Institute
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	GC377-399 Marine sediments
spellingShingle	GC377-399 Marine sediments Muhammad Rashid Abdul Rahim Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia
description	Marudu Bay lies between the geographical coordinates of 6.9511 °N - 7.0373°N and 116.7420 °E - 117.0339 °E where some part of the Bay is under the Tun Mustapha Park (TMP) area that has been gazetted as Malaysia's largest marine protected area. Rapid coastal development and land clearing for aquaculture activities leads to high sediment discharges that may affect the Bay by damaging its marine resources. Hydrodynamic factor plays an important role in the movement of the sediment within the Bay, and it is affected by river discharge, geomorphology of the bay, bathymetry and tidal constituent. The current study aimed to identify the grain size, distribution, and characteristic of surface sediment at the seabed in inner and outer part of Marudu Bay during northeast, inter-, and southwest monsoon. These data then were simulated for hydrodynamic and sediment dynamic during northeast monsoon via Delft3D simulation model. The model set-up of Delft3D simulation was calibrated and verified using field measurements of data, such as water level, current speed and current direction. The field data for current verification were measured using Acoustic Wave and Current profiler deployed on 12 - 25 March 2015 in the middle of the Bay. The surface sediment and water samples were collected at specific date from 45 stations within the Bay using Ponar grab and horizontal water sampler. Subsequently, the sediment and water samples were then analysed using the LISST-Portable Laser Diffraction Size Analyser and standard method in determination of Total Suspended Sediment (TSS), respectively. The composition of silt and sandy silt (7.92 - 68.18 µm) content in the surface sediment samples from entire Marudu Bay (n=38) was dominant with about 90 % and 40 %, respectively. Sand and silty sand (94.94 - 250 µm) composition present only at the certain area (n=7) with 98 % and 80 %, respectively. Highest TSS value was found at ST26 with 14.1 mg/L which located near Telaga river. Overall from 45 sediment samples obtained at Marudu Bay, for sorting characteristic group; (i) 43 samples were poorly sorted and 2 were well sorted, (ii) 33 samples were under coarse skewed and another 12 under fine skewed, and (iii) 38 samples under mesokurtic and 7 under leptokurtic. The hydraulic movement during the ebb and flood tide were uniforms where the water enters and out from the Bay through Cape of Simpang Mengayau. During spring ebb tide (-0.58 m) the surface sediments from inner and outer part of the Marudu Bay were transported out at the rate of 0.1x106 to 0.2x106 m3/s/m and 0.2x106 to 0.4x106 m3/s/m with a mean current speed of 0.13 m/s. While during spring flood tide (0.28 m), the surface sediments were transported into the Bay at the rate of 0.4x106 to 1.8x106 m3/s/m with a mean current speed of 0.09 m/s. Usage of silt curtain need to be implemented as mitigation measure to minimize the sedimentation. Findings of this present study provide baseline information on sediment transport and hydrodynamic pattern within the Marudu Bay to decisionmakers in developing sustainable aquaculture activities.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Muhammad Rashid Abdul Rahim
author_facet	Muhammad Rashid Abdul Rahim
author_sort	Muhammad Rashid Abdul Rahim
title	Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia
title_short	Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia
title_full	Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia
title_fullStr	Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia
title_full_unstemmed	Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia
title_sort	characteristics and dynamics of sediment at marudu bay, sabah, malaysia
granting_institution	Universiti Malaysia Sabah
granting_department	Borneo Marine Research Institute
publishDate	2019
url	https://eprints.ums.edu.my/id/eprint/32864/5/Characterisrics%20and%20dynamics%20of%20sediment%20at%20Marudu%20Bay%2C%20Sabah%2C%20Malaysia.FULLTEXT.pdf https://eprints.ums.edu.my/id/eprint/32864/2/Characterisrics%20and%20dynamics%20of%20sediment%20at%20Marudu%20Bay%2C%20Sabah%2C%20Malaysia.24pages.pdf
_version_	1747836567468113920

Characteristics and dynamics of sediment at Marudu Bay, Sabah, Malaysia

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