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Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia

Debris flows are quite common in Sabah especially in the mountainous area of the Crocker Range and they pose a great danger to the public. While the hazard posed by debris flow is enormous, their inventory and susceptibility assessment are still lacking in Sabah. In the absence of a proper study, th...

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Main Author: Edgar jr. joe
Format: Thesis
Language:English
English
Published: 2018
Subjects:
QE500-639.5 Dynamic and structural geology
Online Access:https://eprints.ums.edu.my/id/eprint/42110/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/42110/2/FULLTEXT.pdf
https://eprints.ums.edu.my/id/eprint/42110/
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spelling my.ums.eprints.421102024-12-16T04:05:40Z https://eprints.ums.edu.my/id/eprint/42110/ Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia Edgar jr. joe QE500-639.5 Dynamic and structural geology Debris flows are quite common in Sabah especially in the mountainous area of the Crocker Range and they pose a great danger to the public. While the hazard posed by debris flow is enormous, their inventory and susceptibility assessment are still lacking in Sabah. In the absence of a proper study, the mitigation strategies to address the debris flow hazards appear to be carried out on an ad-hoc basis. Therefore, this study aims to determine the characteristics of debris flow, to assess the susceptibility level in a basin scale, and lastly to suggest appropriate mitigation strategies. The assessment was conducted by using various methods, which included fieldwork and data collection along the channel, calculation of flow discharge and velocity, analysis of material property based on soil investigation report, rainfall intensity-duration threshold analysis, and lastly susceptibility modelling at a basin scale by applying Frequency Ratio method in geographic information system environment. Two locations of well-known occurrence of debris flow at Jalan Penampang-Tambunan KM 38.80 (Ulu Moyog, Penampang) and Jalan Tamparuli-Ranau KM 83.90 (Bundu Tuhan, Ranau) were selected for the case study. The inventory showed debris flow characteristics as follows: The velocity is equivalent to 0.1 to 2.0 times the discharge, while the travel distance equals to about 3 times the height relief; the debris flow is of granular type which shows high kinetic energy and velocity, as well as shorter transportation distance and high sedimentation towards the deposition; the formation of debris flow involves liquefaction process which is controlled by low plasticity index of soil and higher moisture content, and; lower rainfall intensity-duration threshold of the debris flow ranges between 2.97 mm/h and 8.02 mm/h which is given by the equation of I=9.9D-0.52. On the other hand, the susceptibility analysis displayed that most of the study basin is covered by low debris flow susceptibility, in which the controlling factors are the distance to negative lineament, normalised difference vegetation index, and distance to stream. The mitigation strategies were proposed by using the combination of both active and passive measures. 2018 Thesis NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/42110/1/24%20PAGES.pdf text en https://eprints.ums.edu.my/id/eprint/42110/2/FULLTEXT.pdf Edgar jr. joe (2018) Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia. Masters thesis, Universiti Malaysia Sabah.
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
English
topic QE500-639.5 Dynamic and structural geology
spellingShingle QE500-639.5 Dynamic and structural geology
Edgar jr. joe
Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia
description Debris flows are quite common in Sabah especially in the mountainous area of the Crocker Range and they pose a great danger to the public. While the hazard posed by debris flow is enormous, their inventory and susceptibility assessment are still lacking in Sabah. In the absence of a proper study, the mitigation strategies to address the debris flow hazards appear to be carried out on an ad-hoc basis. Therefore, this study aims to determine the characteristics of debris flow, to assess the susceptibility level in a basin scale, and lastly to suggest appropriate mitigation strategies. The assessment was conducted by using various methods, which included fieldwork and data collection along the channel, calculation of flow discharge and velocity, analysis of material property based on soil investigation report, rainfall intensity-duration threshold analysis, and lastly susceptibility modelling at a basin scale by applying Frequency Ratio method in geographic information system environment. Two locations of well-known occurrence of debris flow at Jalan Penampang-Tambunan KM 38.80 (Ulu Moyog, Penampang) and Jalan Tamparuli-Ranau KM 83.90 (Bundu Tuhan, Ranau) were selected for the case study. The inventory showed debris flow characteristics as follows: The velocity is equivalent to 0.1 to 2.0 times the discharge, while the travel distance equals to about 3 times the height relief; the debris flow is of granular type which shows high kinetic energy and velocity, as well as shorter transportation distance and high sedimentation towards the deposition; the formation of debris flow involves liquefaction process which is controlled by low plasticity index of soil and higher moisture content, and; lower rainfall intensity-duration threshold of the debris flow ranges between 2.97 mm/h and 8.02 mm/h which is given by the equation of I=9.9D-0.52. On the other hand, the susceptibility analysis displayed that most of the study basin is covered by low debris flow susceptibility, in which the controlling factors are the distance to negative lineament, normalised difference vegetation index, and distance to stream. The mitigation strategies were proposed by using the combination of both active and passive measures.
format Thesis
author Edgar jr. joe
author_facet Edgar jr. joe
author_sort Edgar jr. joe
title Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia
title_short Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia
title_full Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia
title_fullStr Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia
title_full_unstemmed Debris flow assessment in the crocker range at Ulu Moyog and Bundu Tuhan, Sabah, Malaysia
title_sort debris flow assessment in the crocker range at ulu moyog and bundu tuhan, sabah, malaysia
publishDate 2018
url https://eprints.ums.edu.my/id/eprint/42110/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/42110/2/FULLTEXT.pdf
https://eprints.ums.edu.my/id/eprint/42110/
_version_ 1818835180328058880
score 13.223943

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