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Debris-Flows in Peninsular Malaysia: Topography, Geology, Mechanism and Sediment Discharge

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Debris-Flows in Peninsular Malaysia: Topography, Geology, Mechanism and Sediment Discharge VOL. 15, NO. 2, JANUARY 2020 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences ©2006-2020 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com DEBRIS-FLOWS IN PENINSULAR MALAYSIA: TOPOGRAPHY, GEOLOGY, MECHANISM AND SEDIMENT DISCHARGE Jimjali Ahmed1, Mohd Raihan Taha2, Mohd Anuri Ghazali3, Che Hassandi Abdullah4 and Senro Kuraoka5 1OPUS Consultants (M) Sdn Bhd, Kuala Lumpur, Malaysia 2Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Malaysia 2Geo Mag Engineering, Shah Alam, Malaysia 4SlopeWatch, Ampang, Malaysia 5Nippon Koei Co Ltd, Tsukuba, Japan E-Mail: [email protected] ABSTRACT Debris-flows caused the highest number of deaths amongst the many types of landslides in Malaysia due to its high velocity, and the travel distance that it covers. As such, 8 events which occurred from 2001 till 2007 were chosen to ascertain the preparatory and triggering factors for debris-flows in Peninsular Malaysia. Site investigations and laboratory tests were conducted and documented in 2010 with detailed description of the debris-flow channels which are useful for deduction of the debris-flow mechanism and sediment discharge estimation. The influences of slope gradient, catchment area and geology on the initiation and deposition of debris-flows are examined and sediment discharge volumes are estimated based on field investigation and calculated based on Japanese guidelines. It is concluded that for the study sites, the bed gradient of initiation zones are more than 20o while the catchment area ranges from 0.2km2 to 3.5km2. The gradient of the banks along the flow path are typically close to 50o forming a V-Shape channel. All initiation locations occurred in weathered granitic rock and are also near to metamorphic formation. The particle size comprises of 75% cobbles and boulders and 25% sandy silt which is typical of weathered granite. The most prevalent mechanism of debris-flow in Peninsular Malaysia is gully bed erosion. Landslide induced debris-flows and collapse of natural dam are also possible. The potential sediment discharge volumes estimated based on the field studies show similar trend with the data in Japan with a sediment yield of about 14,200m3 per event per km2 of catchment area. Keywords: debris-flows, initiation, gradient, catchment area, geology, mechanism, sediment discharge. 1. INTRODUCTION chosen due to the availability of physical details and that Debris-flows, or sometimes referred to as mud- the effects of the debris-flows could be observed then. floods in Malaysia, are fast-moving landslides which Table-1 lists the study locations and the date of debris- generally occur on steep natural terrains during periods of flow occurrences. Out of these chosen events, the events in heavy rainfall [7]. They consist of loose soil, rocks, and Genting Sempah and Gunung Pulai claimed 20 and 5 tree trunks combined with water, forming slurry that flows lives, respectively while the incidence in Gunung downslope. Typical velocity of debris-flows, as reported Tempurung injured a motorist. All debris-flow events by Highland et al. [9] ranges between 16 to 56 km/h. Due chosen for this study resulted in road closures from a few to their relatively high density and viscosity, debris-flows hours to several weeks. can displace boulders, may carry away vehicles and other objects as large as bridges and locomotives. Debris-flows can also be extremely destructive to life and property. Thousands of lives are loss worldwide in any given year due to this disaster. In such a case in December 1999, debris-flows claimed 30,000 lives in Vargas, Venezuela. Since 1961, about 740 fatalities due to landslides were recorded in Malaysia, out of which more than half were due to debris-flows. For example, in 1996, a debris-flow incident in Keningau, recorded 302 fatalities and destroyed close to 5,000 houses (Figure-1). In the same year, another debris-flow incident in Pos Dipang claimed 48 lives [17]. Other cases in Malaysia were reported by Hussin et al [10]. Due to their destructive nature, the Public Works Figure-1. The debris-flow in Keningau which was Department (PWD), Malaysia carried out a study in 2010 triggered by the Gregg Typhoon on 26th December 1996. to investigate the factors that caused some of the major debris-flows in Peninsular Malaysia. Eight sites were 270 VOL. 15, NO. 2, JANUARY 2020 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences ©2006-2020 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com Table-1. Debris-flow sites studied by PWD in 2010 [21]. Date of Occurrence Location Coordinates N 3.71639 15-Nov.-07 Km 4 to 5 Gap-Fraser s Hill Road (FT148) ’ E 101.75833 Km 38.6 Kuala Lumpur-Karak Highway N 3.35342 30-Jun-95 (Genting Sempah) E 101.77583 N 1.59342 28-Dec-01 Gunung Pulai, Kulai , Johor E 103.54283 Km 302 North South Expressway (Gunung N 4.41569 10-Nov-04 Tempurung) E 101.20928 Section 23.3 to 24.10 Kuala Kubu Bharu - Gap N 3.63633 10-Nov-03 Road (FT55) E 101.74261 N 3.39625 2-Nov-04 Km 52.4 Lebuh Raya Karak (Lentang) E 101.89542 Section 62.4, Lojing-Gua Musang Road N 4.60369 3 Jan-09 (FT185) E 101.46569 Km 33 Jalan Simpang Pulai - Cameron N 4.55972 12-Apr-06 Highlands Road E 101.33492 2. SIGNIFICANCE OF THIS STUDY thickness of movable sediment in the channel could be In Malaysia, almost all debris-flows initiates on estimated. Particle size distribution which included large natural terrains as opposed to other forms of landslides boulders was conducted at Fraser’s Hill to determine the which occur mostly on man-made slopes. Investigation composition of the debris material. Soil samples obtained along the channel’s bed would be very challenging and using hand augers up to 1.2m depth were sent to the most studies, therefore, rely heavily on aerial photos and laboratory for classification tests while petrography tests topographic maps from the Land and Survey Department. were conducted on the rock samples. This study, however, involved detailed topographic survey Detailed engineering geological maps which and field investigations along the main channel up to the summarize the observations from the field works were initiation areas, if reachable, which took 1 to 7 days for then produced for all sites. Catchment areas and cross each site. By doing so, field tests could be conducted, and sections along the channel were determined based on the samples could be obtained for laboratory tests. topographic maps while debris-flow mechanisms were With the triggering and preparatory factors of deduced from information obtained from this investigation debris-flows in Malaysia made known, the study will and other researchers. Sediment discharge volumes were support the landslide hazard and risk assessment initiatives determined using the Japanese guidelines [1, 14, 15] and being carried out by various government agencies. This compared to the debris-flow data in Japan. paper, therefore, consolidates the key findings by Ghazali [7] and PWD [21] and focuses on the spatial aspects of the 4. GRADIENT AND CATCHMENT AREA study. The temporal aspects or rainfall threshold of the 8 For the 8 sites being studied, the elevation vs study sites have been published by Kasim [18]. chainage (measured from the road) are plotted in Figure-2 so that the average gradient of the main channel, defined 3. METHODOLOGY AND EQUIPMENT as the slope from the road to the initiation point (along the Topographic surveys were conducted by a channel), and the gradient at the initiation zones could be licensed surveyor so that a base or route map could be determined. The initiation points, as indicated in this prepared for the field works during which, topographical figure, are then decided based on the engineering and geological conditions were noted at various sections geological maps produced for the sites and aerial photos. It along the routes or channels. Aerial reconnaissance by a is concluded that the average bed gradient ranges from 10o helicopter was carried out to take aerial photographs and to 39o while the gradient for the initiation areas ranges plan for the field works. A field investigation form was from 22o to as high as 50o. Based on the debris-flow established so that the elevations, coordinates, cross occurrences in Japan, Osanai et al [22] proposed the most sections, and geological information were adequately probable initiation, flow and deposition sections based on recorded. gradients as depicted in Figure-3. The initiation areas of Site investigation for all 8 sites was carried out debris-flows are typically found on slopes steeper than 15o from 2nd June 2010 till 7th July 2010. Equipment used while deposition areas are found on gentler slopes. during the field works were hand-held GPS, range finder Sediments tend to deposit in areas where the gradient is with 0.1m accuracy, geological hammer and compass. less than 10o and only fine particles may travel beyond 2o. Probe tests were terminated at 100 blows per 30cm, which is equivalent to a bearing capacity of 435kN/m2, at the initiation, flow path and deposition areas so that the 271 VOL. 15, NO. 2, JANUARY 2020 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences ©2006-2020 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com Figure-2. Elevation vs chainage along the channels. Figure-5. Tree trunks deposited at the bridge downstream due to the debris-flow at Gunung Pulai. Possible relationship between catchment area and the average gradient of the main channel is shown in Figure-6. A steeper gradient would require less runoff, hence smaller catchment area to initiate a debris-flow.
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