The 21 February 2005, catastrophic waste avalanche at Leuwigajah dumpsite, Bandung, Indonesia
© Lavigne et al.; licensee Springer. 2014
Received: 18 August 2014
Accepted: 20 November 2014
Published: 24 December 2014
On 21 February 2005 the Leuwigajah dumpsite, Bandung (Java, Indonesia) was affected by a large slide after heavy rainfalls. Second deadliest waste slide in history, it buried 71 houses and killed 143 people. Amongst the contemporary disastrous events of this type, only a few have been documented. We explored failure preconditions, triggering mechanisms and local context that conducted to this disaster. We carried on four field investigations on the site. A series of aerial photographs were acquired and completed by topographical measures on the ground. The morphology of the slide and its trajectory were reconstructed. To constrain the movement condition, we studied the internal structure of the source area and realized surveys among stakeholders of the dumpsite and citizen.
2.7 × 106 m3 of waste materials spread 1000 m from the source in a rice field with an average thickness of 10 m. The material displays a preferential fabric parallel to the previous topography. Numerous internal slip surfaces, underlined by plastic bags explain the low friction coefficient. The presence of methane within the waste dump was responsible for explosions prior to sliding and for the fire that affects whole sliding mass.
Resulting of a combination of heavy rainfall and consecutive explosions due to biogas sudden release, this disaster was predictable in reason of
i) a front slope of the dump of about 100% before the failure;
ii) a poor dumpsite management;
iii) the extreme vulnerability of the marginalized scavengers living at risk at the foot of the instable dump.
KeywordsDump-slide Waste instabilitytriggering factors Waste management Precondition factors Bandung Indonesia
For landslide analysis, precondition factors are generally related to slope, lithology, geological structure, and soil. In a municipal dumpsite, the conditions that govern the landfill stability are more difficult to assess. Shear strength of the municipal solid waste is a function of many factors such as waste type, composition, compaction, daily cover, moisture conditions, age, decomposition, overburden pressure, etc. (Huvaj-Sarihan, and Stark ; Stark et al. ; Bray et al. ). In addition, the triggering factors of waste slides are more complex than for landslide initiation, due to frequent explosions in the dumpsites. The motion processes of the waste avalanches are also complex and poorly known.
Focusing on the 2005 Leuwigajah disaster, the present contribution aims to present: (1) the factors of the failure; (2) the reconstruction of the motion mechanism of the waste slide; (3) the identification of the underlying causes of the disaster.
Waste management operation activities in the Leuwigajah dumpsite
For decades, several dumpsites have operated in Bandung Metropolitan area, which has approximately 6 million inhabitants. In 2005, solid waste generation in this region exceeded 14,000 m3 per day (Sundana ), of which more than half was generated within Bandung city. Household activities produced the highest volume of waste (7700 m3 per day), followed by industrial waste (3200 m3 per day) and public facilities (1400 m3 per day). Out of the whole volume of waste produced in the metropolitan area, only 46% was collected (Sundana ). Most of the uncollected waste was dumped in the rivers (mainly the Citarum River), burned by the population or buried in the backyard.
In 1982, the local administration of the city of Bandung chose the small valley-head of Leuwigajah, a neighborhood of Cimahi, to locate the largest waste disposal for the urban centre. The geological setting consists of volcanic rock (mainly andesite) covered by a thin layer (1 m) of silt or clay material. Before the dumpsite was set up in 1987, small water streams ran through the small valley, mainly during the wet season from October to April. The dumpsite was operated by three different authorities: the City of Bandung, the District of Bandung, and the City of Cimahi. More than 4500 t (or 750 m3) municipal solid waste per day were delivered daily to this dumpsite before the disaster occurred. About 50% of the inhabitants of the two villages located downslope (Leuwigajah and Batujajar) were working on the dump. With a metal hook in one hand and a plastic bag in the other, they methodically rummaged for reusable waste on the deposit from morning to evening. It is within this context of ill-management that the 21 February 2005 part of the mount created by the garbage slid down.
Interviews were aimed at obtaining a better understanding of the dumpsite management and the disaster’s phenomenology. Key respondents included the chief of the Directorate of Volcanology and Geological Hazards Mitigation, the dumpsite security guard, the staff of the administration in charge of the landfill management, and others. Other interviews were conducted with eyewitnesses of the event, including scavengers and inhabitants of the buried villages. Collected data included information about the number of explosions, the direction of the surges, and the timing of the waste avalanche. In addition to the field investigations, additional secondary data were compiled from different sources on waste cohesion and internal friction angle of the deposit (Koelsch et al. ), and gas content within the landfill (P.T. Perusahaan Gas Negara and Perusahaan Daerah Kebersihan Kota Bandung ).
Analysis of waste deposits: a key to reconstruct the waste avalanche dynamics
Morphometry of the waste deposits
Structure and composition of the waste deposits
The deposit’s structure displays different waste layers, which correspond to independent units. Washed by the rain, plastic bags constitute the main part of the material within the upper layers of the dump mass. Most of this material was found burnt due to the gas release, as were the bodies of the victims.
Reconstruction of the waste avalanche dynamics
The independent layers of the waste deposit suggest that during the motion, basal layers stopped while upper layers were still moving, so the stationary base rose incrementally, increasing the deposit volume. The undulating discontinuities seem to correspond to friction surfaces between the layers. The morphology of the deposit, similar to an alluvial fan with steep slopes margins, also suggests that the movement could have been a flow. Therefore it is assumed that the movement can be likened to a debris avalanche, beginning by sliding then evolving to a flow. It seems that the movement was rapid; people had no time to escape although shelter was only 100 m away. Most of the victims were found in groups inside their houses.
In order to compare motion characteristics of the waste avalanche to the one of the debris avalanches, the effective friction angle of the material can be estimated. As the distance from the source to the rice fields is 1000 m and the difference of elevation between the scar and the distal part of the deposit is ~100 m, the H/L ratio is 0.1. This low coefficient indicates an efficient internal friction reduction at the base or within the moving mass. In the case of the Leuwigajah waste avalanche, it is assumed that the high content of plastic bags was responsible for the internal friction reduction as mentioned above.
Origins of the waste slide
Precondition factors of the failure
The procedure for waste disposal was initially regulated (control landfill), however it progressively evolved to an uncontrolled open dump without any regulation (P.T. Perusahaan Gas Negara and Perusahaan Daerah Kebersihan Kota Bandung ).
The great heterogeneity of the waste material, mainly comprising a mixture of plastic bags, pieces of clothes, metallic debris, wood, fine-grained material of organic origin etc. make it difficult to sample the undisturbed material (Figure 3). Therefore, we did not calculate the key parameters for slope stability analysis such as cohesion or internal friction angle.
In the months preceding the 2005 disaster, fires have been reported at the Leuwigajah dump site. Eyewitnesses reported that the waste mass was on fire while moving. Fires may have spread quickly because the landfill contained highly flammable combustible material. All the bodies of the victims were burnt, and the studied material was rather deeply charred. Where fires burn quantities of flammable organic materials, such as plastics, temperatures may be very high in the burning zone. This can then ignite methane in the presence of the oxygen (Woodward ). Deep-seated fires are found at depth in material deposited weeks, months, or years earlier. The common cause of deep-seated fires is an increase in the oxygen level within the landfill, which increases aerobic bacterial activity causing a temperature rise. Deep-seated fires have the potential to: (i) create large voids, invisible from the surface, which can cause cracking and subsidence of the landfill surface; and (ii) produce flammable and toxic gasses, e.g. carbon monoxide, a toxic gas extremely flammable. It is flammable when mixed with air at concentrations between 12% and 75% (Woodward ).
An additional factor contributing to the waste slide was the natural instability of the hillslope at the dumpsite. Geologically, the bedrock of the dumpsite is welded volcanic materials (i.e. andesitic volcanic breccia and grain-supported breccia) covered by a thin layer of silt or clay soil. These parent slope materials have a relatively low permeability. Therefore they prevented drainage and acted as a slip surface for the overlying waste materials that were saturated by infiltrating rainwater. After the 21 February 2005 event, small shallow landslides were identified in the weathered pyroclastic material along the scarp. These landslides were probably triggered by the release of the pressure applied by the dump material on the valley walls in the immediate aftermath of the event.
Triggering factors of the failure
Explosion due to sudden biogas release has been identified as the main factor that has triggered the waste slide. People living in Leuwigajah and Batujajar heard three almost simultaneous explosion-like sounds a few minutes before the slide. They all insisted that the sound was muffled and seemed to come from deep in the ground. A survey in February 2000 in the Leuwigajah dumpsite indicated a CH4 content of 2.3% per volume of gas at a 2 m depth, and almost 5% at a 4 m depth (P.T. Perusahaan Gas Negara and Perusahaan Daerah Kebersihan Kota Bandung ). It can be assumed that the CH4 concentration would have been higher than these values at higher depths. Yet explosion in a dump site may occur if the proportion of CH4 in the air ranges from 5% to 15% (Esmaili ). Above 15%, the biogas ignites but doesn’t explode. The explosion hazard was therefore implicit a few years before the 2005 disaster.
The explosions may have resulted from three factors related to the deep-seated fires described above (see 4.2.1).: (i) build-up of landfill gas in enclosed spaces, (ii) ignition of flammable (e.g. plastic bags) or explosive material deposited in the landfill, and (iii) bursting of sealed drums, cans, aerosol containers or gas bottles deposited in the landfill.
The second triggering factor is meteorological. Three days of heavy rainfall (over 80 mm per day) prior to the failure increased the weight of the waste and the pore-water pressure in the soft subsoil. Water was reported seeping from under the dump three hours before the slide, seeming to indicate that at that time the deposit was saturated. Hence a sudden rise of pressure could be at the origin of both the muffled noise and destabilization of the dump mass. However, it remains unclear whether the explosion led to the slope failure or if the failure, allowing oxygen to reach the combustion zone, triggered the explosion.
An unusual combination of triggering processes
The triggering mechanisms of the waste collapse combined water saturation of the waste deposit, water vaporization, and explosion although these triggers are usually distinct. Thus most of the failures in dump sites relates to heavy rainfall, e.g. the 10 July 2000 disaster at Payatas, the largest dumpsite of Manila city, which occurred following the occurrence of two typhoons. However, waste slides may be also generated without rain, by, either increasing of pore water pressure due to leachate circulation, e.g. during the 8 September 2006 waste slide at the Bantar Gebang dumpsite (Bekasi, Jakarta), or by explosion, e.g. in 1993 at Gembloux, Belgium, or in 1995 at Skellingsted, Denmark (Kjeldsen and Fisher ).
Difficulties and attempts to assess dump instability
Documented wasteslide events in municipal solid waste dumpsites
Payatas, Manila, Philippines
Leuwigajah, Bandung, Indonesia
This work; Koelsch et al. ()
Belo Horizonte, Brazil
Bantargebang, Bekasi, West Java, Indonesia
Suara Merdeka, 9 September 2006; personal field data
Bogor, West Java, Indonesia
Cianjur, West Java, Indonesia
Tuban, East Java, Indonesia
Bantargebang, Bekasi, West Java, Indonesia
Cited by Koelsch et al. ()
Bulbul, Durban, South Africa
Iriya, Tel-Aviv, Israel
Doña Juana, Bogota, Colombia
Bens, Coruña, Spain
Landva and Dickinson ()
Rumpke, Cincinnati, Ohio, USA
Leuwigajah, Bandung, Indonesia
Personal field data
Kettleman, California, USA
Gandolla et al. ()
Bandeirantes, Saõ Paulo, Brazil
Bauer et al. ()
A difficulty to assess motion processes of waste avalanches
The study focused on the motion processes of the waste, which are poorly known. It can be argued that the upper part of the waste mass moved downward through a sliding process, whereas the distal part displayed a flow motion, similar as a debris avalanche. Surprisingly, this statement is not consistent with the interpretations of formers studies (Table 1). Half of the events described in the literature were clearly defined as slides (e.g. at Kettleman in California, Istanbul, Coroña, Jakarta). Other events were described as waste flows similar to debris flows (e.g. at Bogota, Durban, Manila and maybe Belo Horizonte). However, the interpretations of the former studies were only based on visual observations by eyewitnesses, whereas the methods we used combined both eyewitness accounts and a field analysis of the internal structure of the waste deposits. This original approach for this kind of study allows us to state that both sliding and flow processes were involved during the 2005 waste avalanche at Leuwigajah. The type of movement, however, may be of different type depending on the internal structure of the material deposited in the dump and the origin of motion. Like natural slides, avalanches and debris flows the intrinsic scale and prior characteristics of the material involved may very well be the conditioning factor leading to a certain mechanisms of movement.
The volume of the 2005 collapsed waste (2.7 × 106 m3) is higher than any of the previous similar events (Table 1): their volumes did not exceed a few hundreds of thousands cubic meters at Bogota (1997) or Manila (2000), and reached 1.3 × 106 m3 at Istanbul (Kocasoy and Curi ), − half the volume of the waste deposits at Leuwigajah. The large volume of water saturated waste at Leuwigajah, in addition to the explosion may explain the excessive runout up to 1000 m. The high content of plastic bags (apparently more than 10%, which is the highest proportion found in most of the municipal dumpsites – see Table 1 in Blight and Mbande ) could have also contributed to this excessive runup by reducing internal friction.
Two scenarios for waste avalanche initiation
Scenario 1: failure due to dump mass saturation by rainwater
Scenario 2: failure triggered by explosion
(1) The infiltration of rainfall decreased the shear strength of the dump, leading to its slide;
(1) Heavy rainfall on the dump site led to increased water percolation through the waste material.
(2) Once in motion, the disturbance of the mass structure allowed large volumes of methane to contact smouldering waste, leading to the explosions.
(2) The percolating water reached the top of the combustion zone deeply inside the waste mass.
(3) The vaporization of the water produced an increase of gas pressure at the base of the dump that probably lifted up a part of it, resulting in a sound-like explosion during the liberation of the accumulated pressured gas.
(3) The material experienced a long runout, because of the intrinsically low internal friction of the saturated waste material, aided by steam production. The ‘still-hot’ material would have then also burnt the victims of the slide.
(1) The vaporization and the lift up processes combined their effects to bring air to the combustion zone. The second and probably the third explosion then occurred.
(2) As the destabilized mass began to slide, the fire propagated to the whole moving mass, helped by the significant amount of CH4 trapped into the waste material (numerous swirling flames were reported by eyewitnesses and were probably due to the gas trapped in the plastic bags).
(3) The combustion of each plastic bag within the moving mass produced gas that allow an expansion of the whole mass to occur. Once started, this mechanism, as well as water vaporization, triggered a self maintaining expansion during the transport. This self maintaining expansion, responsible of a friction reduction within the waste material, determined the unusually high mobility of the moving mass and can also explain why the whole material was deeply burned.
Uncommon hazard, but predictable disaster
Compared to the previous similar events documented in the scientific literature, the 2005 event displays some distinguishing features concerning both the hazard and the factors of vulnerability on site, which finally led to a major disaster.
The Leuwigajah disaster was predictable as it repeated similar events that have happened in other parts of the world. The waste slide indeed affected marginalized and vulnerable people who struggled to make a living out of the dumpsite. Poor people scavenging, sorting and selling rubbish to more powerful and affluent middlemen is a common pattern in Bogota, Belo Horizonte, Manila and Jakarta, and all these areas were affected by waste slide disasters in the recent decades. Children are the most vulnerable people facing waste slide hazard. On 16 March 2010, a 6-meter-high and 20-meter-long massive barrier fell down, killing four scavengers and badly hurting eight more people at the Galuga Municipal Waste storage in Cibungbulang, a suburb of Bogor city in Indonesia. Eleven of twelve victims were only 13 to 20 years old (Indonesia Today, posted online on 16 March 2010).
The abundant and constant flow of waste constitutes a significant resource for the poorest suburban communities. In Leuwigajah the amount of solid waste dumped was 14.7 × 106 m3 in 1999 (P.T. Perusahaan Gas Negara and Perusahaan Daerah Kebersihan Kota Bandung ). For those who migrate to the vicinities of large cities, dumpsites are an easily accessible resource to draw a living from as scavenging rubbish does not require specific skills. In the two villages next to Leuwigajah, it was estimated from interviews with key respondents that about 50% of the people were largely dependent on scavenging rubbish for their subsistence.
To these people the dumpsite is both a hazard and a resource but people brave the potential threat of waste slides on a seasonal basis to secure their daily needs. This was very evident in 1992 when a smaller waste slide occurred in Leuwigajah. Although seven houses were buried – fortunately no one died – people continued to scavenge rubbish as they did before. Similarly, in Payatas, Philippines, a waste slide buried several houses in 1999, or a year before the 2000 tragedy, but none of the affected families accepted the relocation scheme offered by the local government (Gaillard and Cadag ).
The immediate environment of dumpsites is usually considered as unsuitable for settlement by those who can choose where they live. On the other hand, for the most marginalized and poorest people, the cheap and often illegal nature of settlements near dumpsite is another resource as these people cannot afford more expensive rents in safe places (Blight and Mbande ). Settling far away from their primary mean of livelihood, i.e. the dumpsite, would also imply time and financial costs they cannot support. Interviews conducted after the Leuwigajah disaster showed that hundreds of families used to live within 500 m from the foot slopes of the Leuwigajah dumpsite. Most of these people further lived in houses made of scrap materials scavenged from the dumpsite. Such housing proved to be very vulnerable to urban fire and waste slide.
However, most of the other open dump sites in Indonesia are still uncontrolled, and therefore constitute a significant hazard for many communities. For example, the TPA Putri Cempo was built in 1985 in the vicinity of Surakarta (Central Java) for a scheduled life time of 15 years. However, this open dump site is still used today, although it remains unstable due to its overload and to the steep slope of its 9.5 m high front. Due to a rapid urban growth, all the large cities of Indonesia are concerned by the waste slide hazard, as exemplified by recent disasters or accidents (Table 1), e.g. at Bekasi in the vicinity of Jakarta in 2006 (28 deaths) and again in 2012, Bogor in 2010 (4 deaths), and Cianjur in 2013 (1 death). The transformation from uncontrolled open dump to controlled sanitary landfills is therefore highly recommended.
On the 21 February 2005 at 2.00 am, 143 people and 71 houses were buried under several meters of waste in motion initiated from the Leuwigajah dump site (Bandung, Indonesia). This disaster ranges second among the deadliest events of this type worldwide., The failure in the dump resulted from two triggering processes, i.e. heavy rainfall and consecutive explosions due to biogas sudden release. The flow initially moved as a slide, and then evolved into a flow. The waste avalanche extended as far as 1000 m from the scarp towards the paddy fields, due to the limited shear stress at the base of and within the waste in motion. Several factors may have played a key role in the shear stress reduction, e.g. the high quantity of biogas and water into the flowing mass, the very low weight of the material transported by the avalanche (plastic bags), the wet surface of the paddy field etc.
Whatever the natural triggers for the waste slide, the disaster cannot be dissociated from the extreme vulnerability of those marginalized people who died and suffered. Although previous waste slides occurred in the past the local government failed to both implement structural measures to stabilized the dumpsite and provide scavengers with alternative sustainable livelihoods. The amount of waste dumped in Leuwigajah actually sharply increased over the years before the disaster.
Only after the 2005 disaster did the activity of the dumpsite come to an end, and the local official in charge of the site was charged for not respecting the official recommendations regarding waste disposal and was sentenced to jail. In parallel, local communities complained about the closure of the dumpsite without appropriate alternative sustainable livelihoods. Although the disaster obviously brought some significant changes in Leuwigajah in the short term, the long-term prospects are bleak. A project by Environmental Protection Agency of West Java Province (BPLHD) has been planned for redeveloping a controlled landfill on the same site.
Many thanks to the inhabitants of the villages that have been destroyed by the wasteslide for their cooperation. We are grateful to Center of Volcanology and Geological Hazard Mitigation Bandung who supported the spatial data of research area and some fieldworks conducted in 2005 and 2006. We also acknowledge Dr. Surono for his advises, and Bachtiar Wahyu Mutaqin for his technical help. We thank the anonymous reviewers who helped to improve the initial version of the paper.
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