Using Geographic Information System and Analytical Hierarchy Process in Landslide Hazard Zonation

Abstract

Nepal frequently suffers from various types of water induced disasters like soil erosion, landslide, debris flow, flood etc. To mitigate the problem related to Landslides & Debris flow, Landslide Hazard zonation is important to quick and safe mitigation measures and make strategic planning for the future by identifying the most vulnerable areas and channelizing most of the protective measures and techniques to a more focused area. This study was carried out in Rupa watershed area of kaski district with the main objective of identifying the landslide triggering factors and making the landslide hazard zonation map of the study area. Analytical Hierarchy Process (AHP) and Geographic Information System (GIS) were entirely employed for the preparation of Landslide Hazard Zonation mapping. The main factors responsible for the occurrence of landslide was found to be slope, aspect, landcover, presence of roads and presence of river and streams. Among these factors, the presence of road factors had the prominent effect on landslide occurrence. Altogether 13 landslide events were recorded in the study area and among them most of the landslide events were seen in Rupakot Village Development Committee (VDC). The final landslide susceptibility map of the study area can help the development planners to know more about the area and disseminate their development project in accordance with the need base approach. Proper development plan, proper system of keeping the records of landslide events, broadcasting high susceptible zones for landslides, implementing appropriate conservation technology, giving instructions to the locals can help to minimize these kind of natural disasters.

Quantifying the Spatiotemporal Pattern of Urban Expansion and Hazard and Risk Area Identification in the Kaski District of Nepal

“…Thulibesi phant in Armala, where 117 sinkhole spots were observed, is exposed to severe sinkhole hazards [55]. Sarangakot and Kaskikot within the Phewa watershed [56] and the Rupakot area of the Rupa watershed [57] are prone to landslide hazards. The Phewa Lake catchment area in Pokhara witnessed a shallow seated landslide due to extreme rainfall in 2007 [51].…”

“…A detailed geographical study of Pokhara, Kaski was carried out by Gurung in 1965 [66]. Yet, there are few studies have assessed the hazard risk scenario [54][55][56][57][58] and urbanization trends [67,68] of Pokhara City and the Seti watershed [8]. However, long-term time-series studies of urbanization and the hazard risk of the entire Kaski District is lacking.…”

Vulnerability Assessment of Peoples Exposed to Landslides in Panchase of Nepal using Analytical Hierarchy Process

“…Figure 5 represents the landslide inventory map of Panchase laid over the local MP/RMP. In past researches of landslide hazard zonation, the landslide density was found to be 0.44 per km 2 (Basnet et al, 2006) in the Phewa watershed and 0.571 per km 2 (Bhatt et al, 2013) in the Rupa watershed. These landslide densities were lower than that was found in the entire Panchase region.…”

Geo-hazards assessment and land suitability estimation for spatial planning using multi-criteria analysis

“…Most studies have concentrated on the detailed analysis of a single potentially destructive natural phenomenon: floods [ [12] , [13] , [14] ], landslides [ 15 , 16 ], and earthquakes [ 17 , 18 ]. However, a region is affected not only by a specific natural hazard but also by a series of geo-hazards.…”