LANDSLIDE SUSCEPTIBILITY MAPPING ALONG NATIONAL HIGHWAY-6, HOA BINH PROVINCE, VIETNAM USING FREQUENCY RATIO MODEL AND GIS
Keywords:Landslide susceptibility map, Frequency ratio, GIS, National Highway-6, Vietnam
The landslide has happened quite frequently on National Highway 6 (NH6) and causes damage to both property and life every year. Whereas, detailed landslide susceptibility maps are rarely available on this road. The application of the Frequency Ratio (FR) method and GIS allows for faster, cheaper, more efficient and easily updated landslide susceptibility area determination. This paper presents a landslide susceptibility map along NH6 by using the FR method and GIS. The input data layers include eight main factors that cause landslides, which have collected from various sources. The FR value for each class was calculated based on the spatial relationships between the landslide inventory and landslide influencing factors, then integrated into the GIS environment to produce a landslide susceptibility map. This map was classified into five levels, including very low, low, moderate, high and very high. The validation result of the frequency ratio model is fairly good (AUC = 0.738). The developed landslide susceptibility map can help organizers and decision-makers give early warning to people who have lived along this route and improve the planning of construction and land-use change.