Estimation of the past and future landslide hazards in the neighboring slopes of the 2016 Aranayake landslide, Sri Lanka

Tan, Qinwen; Sassa, Kyoji; Dang, Khang; Konagai, Kazuo; Karunawardena, Asiri; Bandara, R. M. S.; Tang, Huiming; Sato, Go

doi:10.1007/s10346-020-01419-1

Cited by 12 publications

(1 citation statement)

References 20 publications

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“…Furthermore, the mass movement does not follow the joint patterns of the basement rocks, which are approximately N60 • E and N45 • W. The exposed slide surface of the basement rock weakened due to weathering along the mica-and feldspar-rich layers that are common in weathered rocks. This chemical weathering is known to weaken the hornblende biotite gneiss's surface [54]. The presence of non-engineered man-made structures, as well as the diversion of natural streams or water flow paths during building construction, indicate an anthropogenic influence on the natural conditions of the slope.…”

Section: Distinguished Features Of the Slope Failures At The Study Sitesmentioning

confidence: 99%

Risk Assessment in Landslide-Prone Terrain within a Complex Geological Setting at Kadugannawa, Sri Lanka: Implications for Highway Maintenance

Pitawala,

Wimalakeerthi,

Heinze

2024

Geotechnics

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The major highway in Sri Lanka that links the capital, Colombo, with the second capital, Kandy, passes through Kadugannawa, characterized by steep hills. The geological and geomorphological setting of the terrain often leads to slope failures. The objective of this study is to interpret the key factors influencing the slope failures that occurred in close proximity at two separate locations with two different slope conditions. Typical local and regional brittle and ductile structures include fault scarps, deep-seated detachments, and variable folding. According to our results, one of the studied locations experienced translational landslides because of weakened basement rock surfaces, hydrophilic clay minerals, and anthropogenic influences, whereas the other location experienced multiple stages of mass movement influenced by inhomogeneous colluvial soil and regional, geological, and hydrogeological conditions. Based on the present study, it can be concluded that geological studies must be carried out within the local area rather than at the regional scale. Otherwise, the constructions for the prevention of landslides in complicated geological settings will fail or may not be used for a long period. Moreover, consideration of future climate change is essential when undertaking construction in challenging terrains.

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Section: Distinguished Features Of the Slope Failures At The Study Sitesmentioning

confidence: 99%

Risk Assessment in Landslide-Prone Terrain within a Complex Geological Setting at Kadugannawa, Sri Lanka: Implications for Highway Maintenance

Pitawala,

Wimalakeerthi,

Heinze

2024

Geotechnics

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SATREPS Project for Sri Lanka with Regard to “Development of Early Warning Technology of Rain-Induced Rapid and Long-Travelling Landslides”

Konagai¹,

Karunawardena

Sassa³

2020

Understanding and Reducing Landslide Disaster Risk

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Influenced by the recent global climate change, extreme rainfall events have become more frequent worldwide and resultant hydro-meteorological hazards are creating more deaths and devastations. One of the most remarkable disasters of rain-induced rapid long-travelling landslides (RRLL) in Sri Lanka took place at Aranayake, 70 km east of Colombo in 2016 (JICA Survey Team 2016 ) (JICA Survey Team in Survey results of Aranayake Disaster, 2016). The fluidized landslide mass ran over an about 2 km distance claiming the lives of 125 people. This tragic event has thus highlighted the importance of sophisticated early warning and disaster management mechanism even more than ever, because the presence of these hidden unstable soil masses as well as their run-out distances are very difficult to predict, and once they start sliding, it is almost impossible to stop them. Both the National Building Research Organisation, Sri Lanka (NBRO) and the International Consortium on Landslides (ICL) have jointly compiled a research proposal within the framework of SATREPS, standing for “Science and Technology Research Partnership for Sustainable Development,” a Japanese government program that promotes international joint researches, and it passed the final round of selection on May 16, 2019. Thus, the new 5-years SATREPS project for Sri Lanka with regard to “Development of early warning technology of Rain-induced Rapid and Long-travelling Landslides (Project RRLL)”, starts in 2020. This article reports on the outline of the project including its goals, plans of plots for developing individual technologies for the early warning system, etc.

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Early Warning System Against Rainfall-Induced Landslide in Sri Lanka

Konagai¹,

Karunawardena²,

Bandara³

et al. 2023

Progress in Landslide Research and Technology

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Based on solid evidence, scientists attribute the global warming trend observed since the mid-twentieth century to the human expansion of the “greenhouse effect.” Extreme rainfall events have become more frequent worldwide, resulting in hydro-meteorological hazards creating more deaths and devastation. One of the most remarkable disasters of rain-induced rapid long-traveling landslides (RRLL) in Sri Lanka took place at Aranayake, 70 km east of Colombo, in 2016 (JICA Survey Team (2016), Survey results of Aranayake Disaster, JICA. URL: https://www.jica.go.jp/srilanka/english/office/topics/c8h0vm00006ufwhl-att/160720.pdf [Last accessed: April 14, 2020]). The fluidized landslide mass ran over an about 2 km distance claiming the lives of 125 people. This tragic event highlighted the importance of reliable early warning and disaster management mechanisms even more than ever because the presence of these hidden unstable soil masses, as well as their run-out distances, are hardly predicted. Once they start sliding, it is almost impossible to stop them. Since 2020 (after the preceding period of 2019), both the National Building Research Organization, Sri Lanka (NBRO) and the International Consortium on Landslides (ICL) have jointly started a new 5-year research project, “Development of early warning technology of Rain-induced Rapid and Long-travelling Landslides (Project RRLL),” within the framework of SATREPS. SATREPS, standing for “Science and Technology Research Partnership for Sustainable Development,” is a Japanese government program promoting international joint research. This article reports on the outline of the project, including its background, goals, plans of plots for developing critical technologies for the early warning system, etc.

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Estimation of the past and future landslide hazards in the neighboring slopes of the 2016 Aranayake landslide, Sri Lanka

Cited by 12 publications

References 20 publications

Risk Assessment in Landslide-Prone Terrain within a Complex Geological Setting at Kadugannawa, Sri Lanka: Implications for Highway Maintenance

Risk Assessment in Landslide-Prone Terrain within a Complex Geological Setting at Kadugannawa, Sri Lanka: Implications for Highway Maintenance

SATREPS Project for Sri Lanka with Regard to “Development of Early Warning Technology of Rain-Induced Rapid and Long-Travelling Landslides”

Early Warning System Against Rainfall-Induced Landslide in Sri Lanka

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