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Subject: Soil and Water Engineering × Author: Bohra, Manoj Singh × Start date: 2020 × Type: Thesis × Thesis Type: M.Tech. ×
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    ThesisItemOpen Access
    Morphometric analysis and landslide zonation mapping: a case study from Kumaon division of Uttarakhand
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-09) Bohra, Manoj Singh; Deepak Kumar
    The present study consists of morphometric analysis and preparation of the Landslide Zonation Map for the western Mid-Himalayan region in the Kumaon division of Uttarakhand. The study area i.e., the Kwarab-Khairna region is located in the Almora and Nainital districts of Uttarakhand, with a spatial extent from latitude 29°40ʹ55ʺ N to 29°22ʹ41ʺ N and longitude 79°24ʹ58ʺ E to 79°39ʹ21ʺ E, respectively. The morphometric analysis suggests that the area has an elongated shape with a very coarse drainage texture and subsoil with high permeability, dense vegetation cover and low relief. The drainage area is under the mature development stage with geologic structures having very little impact on the stream network. In the present work, a multi-criteria analysis technique is used for landslide zonation mapping. Thematic maps of different factors, namely slope, aspect, elevation, lineament density, drainage density, rainfall, geology, soil and land use/land cover were prepared and integrated into the GIS platform for the landslide zonation. The analytic hierarchy process was used to determine the weight values for each considered factor. The sub-classes of each thematic map were further rated on a scale from 0 to 9. The landslide zonation map of the Kwarab-Khairna region was produced using the weighted overlay technique. The zonation map divides the area into four zones, namely low, moderate, high and very high. The findings demonstrate that the majority of the area belongs to the moderate landslide zonation class. A significant finding emerged from the study that some of the important locations within the study area such as Khairna, Garampani, Suyalbadi, Suyalgaon, Kagdighat, Kainchi Dham and the NH connecting Almora-Nainital fall under the category of high and very high landslide zones.