International Session (Disaster Prevention and Mitigation)

[CS2-32] INVESTIGATION INTO ROAD SUSCEPTIBILITY ASSOCIATED WITH LANDSLIDE HAZARD OF THE LAO NATIONAL ROADS IN THE NORTHERN REGION

〇nilundone PHANVONGSA¹, toshiro HATA¹ (1.Hiroshima University)

Keywords:Laos national roads, Landslide, Road susceptibility, Rainfall, Geological condition, Geographical condition

This investigation was conducted to evaluate the level of road susceptibility associated with landslide hazards of Lao national roads. The scope of the study is limited within the northern region which consists of nineteen (19) national roads with a total length of 3,578 kilometers. The study considered ‘rainfall’, ‘geological condition’ and ‘slope gradient’, as landslide occurrence influencing factors. And a semi-quantitative approach was used to analyze the level of road susceptibility. As a result, negligible-medium susceptibility is predominant. However, strategic road No.13N and No.2 are the longest road exposed to landslide at high and very high susceptibility (level 4 and 5).