2019 年 11 巻 4 号 p. 124-130
On 29 th October, 2014 during a heavy rain event, a large landslide occurred in Koslanda, Badulla District, Sri Lanka. The landslide and associated debris flow destroyed several houses and killed more than 30 people. Following the landslide, an aerial survey by helicopter on 5 th November, 2014 and field survey on 19 th and 20 th November, 2014 were undertaken by JICA (Japan International Cooperation Agency) Project Team to understand the occurrence mechanism of the landslide and identify further hazard of the landslide. Further, we conducted numerical simulation to understand processes of these sediment disasters. This report summarizes the observation results conducted by the JICA Project Team, presents the geological explanation of the mechanism and causes of the landslide, and gives suggestions on emergency mitigation measure for further movements of the landslides.
