GIS modelling of slope stability in Phewa Tal watershed, Nepal

摘要: Abstract Hazards are an inherent but dangerous and costly element of mountainous environments. Conventional maps mountain hazards provide useful inventories hazardous sites little insight into the operation hazards. Furthermore, this approach tends to rely heavily on subjective interpretation landscape, which means that results can not be replicated or transferred other areas. Thus, alternative approaches employing quantitative capabilities geographic information systems (GIS) model predict slope stability receiving increasing attention. This paper reports use a diverse GIS database, compiled primarily from existing aerial photographs, construct regional in Phewa Tal watershed, Nepal. An integral part research was explore commonly used grid cell by geomorphometrically significant terrain units. The units employed were created generating line networks representing local maxima minima extracted elevation curvature surfaces. One chief benefits applying technology ability georeference all attribute data these In doing so, it allowed database exported external statistical package, where could statistically explored as basic analytical unit. application variety techniques resulted logistic regression being selected most useful. Logistic successfully predicted either stable unstable at rate approximately 90% concordance with conventionally produced map stability. probabilities unit imported back produce compared well conventional findings suggest digital (DEM) efficient using regular cells. particular, facilitated regression, significantly decreased amount computing costs. Finally, also suggests important gathered sources, such maps, written documents, thereby limiting need for time consuming field work reconnaissance level. Based latter finding, satellite imagery, should examined.