A Rulebase physiographic characterization of a drought prone watershed applying remote sensing and GIS |
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| Authors: | P S Arun R Jana M S Nathawat |
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| Institution: | 1. Centre for Studies in Resource Engineering, IIT-Bombay, 400 076, Mumbai, India
2. Birla Institute of Technology, P. O. Mesra, 835 215, Ranchi, India
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| Abstract: | Efficient micro-watershed management needs characterization of it to optimize natural resources, which is especially important
in drought prone areas. In the present study micro-watersheds of Gandheshwari tributary in Chotta-Nagpur Plateau are characterized
based on physiographic properties towards agricultural potentiality. An algorithm interpolating elevation values using an
empirical formula is proposed to obtain an improved Digital Elevation Model (DEM). IRS LISS-Ill Satellite data is used to
acquire important parameters like landuse/ landcover and drainage. Image processing techniques like edge enhancement, edge
detection, and principal components analysis are used for improving lineament detection. For characterization of watershed
landform analysis using physiographic parameters is done in Geographic Information System (GIS). Detailed drainage network
obtained from satellite image, the improved DEM and other GIS layers of land based information are used to delineate micro-watersheds.
The Agricultural 1-lydrologic Response Units (AHRU) targeting agricultural use of the land are derived by overlaying the delineated
parameters and are grouped into thirty response units based on their agricultural potential. Micro-watersheds are characterized
based on the dominant Al-IRU giving spatial information about agricultural suitability, emphasizing availability and scarcity
of water so that respective water conservation practices can be improved to use the potential AHRU. |
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