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Landslide zonation for hill area development
- Data Base Generation For Landslide Vulnerable Zonation Mapping
The landslide investigation and hazard zonation mapping study involves preparation of number of thematic databases such as slope, soil, rainfall, geomorphology, geology, and landuse of the area. As the main purpose of the study is to prepare landslide hazard zonation map and collection of these information being carried out for several decades through the traditional, conventional- ground based surveying and mapping methods, which had taken a lot of time, more man power and cost. But nowadays the emerging satellite based remote-sensing techniques has become more efficient tool for obtaining such information with less cost and time. In the present study, three thematic maps have been prepared by interpreting orthophotos.
The different thematic maps are,
- Slope Map
- Soil Map
- Landuse Map
- Slope Map
Slope map is very important factor for landslide study. If the slope is higher then there is a chance of occurrence of landslide. Contour maps have been used for the preparation of slope map. Using the Arc view 3D analyst, the tin model (figure-2) for the study area is created from the digitized contour map (figure-1). From the tin model, slope map was generated using "derive slope" command.
- Soil Map
By interpreting the orthophotos with photo interpretation keys like tone, texture, associated feature and with help of agricultural engineering soil maps, soil types present in the study area have been delineated and mapped. Eight soil series are identified in the study area.
- Soil Texture
The following soil series are present in the study area
KG1 - sandy loam - sandy clay loam.
KG2 - sandy clay loam
KG3 - sandy clay
KG4 - sandy loam - sandy clay loam
KG5 - sandy loam - sandy clay loam
KG6 - sandy clay loam
KG7 - sandy clay - sandy clay loam.
KG8 - sandy clay loam - sandy loam
KG9 - sandy loam
- Landuse Map
Landuse refers to "man's activities and various use which carried on land". Land cover refers to "natural vegetation, water bodies, rock, soil, artificial cover and other resulted due to land transformation". In the present study, landuse / landcover map has been prepared on 1:2500 scale using Orthophotos with the help of visual interpretation keys such as tone, texture, size, shape, pattern and associated features.
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