Sains Malaysiana 52(6)(2023):
1889-1900
http://doi.org/10.17576/jsm-2023-5206-23
Pemetaan Geobahaya Berdasarkan Kaedah Faktor Penilaian Tanah Runtuh (LHEF) di Empangan Sultan Mahmud, Tasik Kenyir,
Kuala Berang, Terengganu
(Geohazard Mapping Based on the Landslide Hazard Evaluation
Factor (LHEF) Method at Sultan Mahmud Dam, Tasik Kenyir, Kuala Berang, Terengganu)
MOHAMAD ANURI GHAZALI1,*, MOHD
ROZI UMOR2 & ABDUL GHANI MD RAFEK3
1,3Geo Mag Engineering, No 31B, Level
2, Jalan Pelabur B, 23/B, Seksyen 23, 40300 Shah Alam,
Selangor, Malaysia
1,2Geology Programme, School of
Environmental and Natural Resources, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
Received: 31 March
2023/Accepted: 15 June 2023
Abstrak
Kajian pemetaan potensi tanah runtuh telah dilakukan dengan menggunakan kaedah Faktor Penilaian Tanah Runtuh (LHEF) di Empangan Sultan Mahmud, Tasik Kenyir yang melibatkan kawasan tanah tinggi dengan litologi batuan granit, cerun potong kejuruteraan dan cerun semula jadi. Kaedah pemetaan LHEF sangat berguna kepada perancang bandar bagi tujuan pembangunan kawasan untuk memastikan secara relatif kawasan tersebut selamat. Permasalahan dalam kajian ini adalah kawasan kajian yang berbukit dan berbatu yang curam yang mana agak sukar untuk memperoleh data. Sebanyak enam (6) parameter dipertimbangkan dalam penilaian geobahaya cerun iaitu litologi, struktur geologi, morfometri cerun, penurunan relatif, guna tanah dan tutupan tanah serta keadaan hidrogeologi. Hasil daripada penilaian yang dijalankan diplotkan di dalam peta geobahaya potensi tanah runtuh. Penentuan kaedah pemetaan geobahaya sesuatu kawasan perlu mengambil kira keadaan sesuatu bagi memastikan pemetaan geobahaya yang dijalankan menghasilkan keputusan yang tepat. Sebanyak 858 cerun telah dinilai di dalam kajian ini yang merangkumi kawasan kajian 1, 2 dan 3. Didapati699 cerun dizonkan sebagai geobahaya sederhana, 87 cerun dizonkan sebagai geobahaya
tinggi dan hanya 72 cerun dizonkan sebagai geobahaya rendah. Secara asasnya ciri cerun yang
dikategori sebagai geobahaya rendah adalah landai, tiada hakisan dan tiada struktur geodinamik. Zon
geobahaya cerun sederhana pula adalah cerun yang mempunyai kecerunan sederhana
curam, hakisan alur dan galur. Cerun yang dikategori sebagai geobahaya
tinggi mempunyai struktur geodinamik seperti tegangan, rekahan, kecerunan
melebihi 45 darjah, batu tongkol yang longgar, runtuhan lama, hakisan dan
ketakselanjaran yang recam.
Kata kunci: Faktor Penilaian Tanah Runtuh; skor geobahaya; Tasik Kenyir
Abstract
A
landslide potential mapping study was conducted using the Landslide Hazard
Evaluation Factor (LHEF) method at Sultan Mahmud Dam on Tasik Kenyir, which includes upland areas with granite
rock, artificial slopes, and natural slopes. The LHEF mapping method is very
useful for urban planners in developing areas to ensure that the area is
relatively safe. The problem with this study is that the study area is a hilly,
steep, rocky area where it is quite difficult to obtain data. A total of six
(6) parameters are considered in the assessment of slope geohazards,
namely lithology, geological structure, slope morphometry, relative subsidence,
land use and land cover, and hydrogeological conditions. The results of the
assessment carried out are presented in the geohazard map of potential landslides. When determining the method for mapping landslides
in an area, the situation must be taken into account to ensure that the
landslide mapping carried out provides accurate results. In this study, a total
of 858 slopes were assessed which included study areas 1, 2, and 3. It was
found that 699 slopes were classified as moderate hazard, 87 slopes as high
hazard and only 72 slopes as low hazard. The characteristics of slopes
classified as low geological risk are essentially slope, no erosion and no
geodynamic structure. Slopes classified as moderate hazard have moderately
steep slope, erosion of furrows and stresses. Slopes classified as high hazard
are those that have geodynamic structures such as stresses, cracks, slopes
greater than 45 degrees, loose cobbles, old ruins, erosion, and severe
discontinuities.
Keywords: Geohazards rating; Landslide Hazard Evaluation Factor
(LHEF); Tasik Kenyir
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*Corresponding author; email:
mohamadanuri16@gmail.com.my
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