Landslide Susceptibility Mapping in the Nandprayag to Gauchar, Uttarakhand Using the Frequency Ratio Method
摘要
The most common geohazard in the world’s mountainous regions is landslide. It has an impact on daily activities as well as human properties, infrastructure, sceneries, and way of life. A crucial element in environmental planning is landslide susceptibility mapping, which helps to reduce the risk of landslides on human dwellings and assets. For this work, Landslide Inventory is collected from BHUKOSH showing 278 landslides. Additionally, six landslide causal factors (including both triggering and conditioning) were used for this purpose. Every theme layer has many classifications, some of them have a greater control on the incidence of landslides than others. The frequency ratio model determined that the slope classes between 10° and 85°, the convex, concave and flat curvature’s classes, the aspect classes (north(N), northeast (NE), south(S), and southwest (SW) directions) and the classes of elevation lie in the 640–3200 m range are the most influential factor classes. There are various classes of land use and cover factors, and these classes have varying degrees of direct and indirect influence on the occurrence of landslides. The high, moderate and low classes on the landslide susceptibility map each accounted for 4%, 50% and 46% of the total area, respectively. Further, the landslide susceptibility map was confirmed through Bhukosh landslide points and ROC curve predicting 70% to assess the dependability of the model.