Prioritization of subwatersheds based on quantitative morphometric analysis in lower Bhavani basin, Tamil Nadu, India us
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ORIGINAL PAPER
Prioritization of subwatersheds based on quantitative morphometric analysis in lower Bhavani basin, Tamil Nadu, India using DEM and GIS techniques Anand Balasubramanian 1 & Karunanidhi Duraisamy 1 & Subramani Thirumalaisamy 2 & Srinivasamoorthy Krishnaraj 3 & Raneesh Kolladi Yatheendradasan 4 Received: 26 May 2017 / Accepted: 30 November 2017 # Saudi Society for Geosciences 2017
Abstract Watershed prioritization is one of the most important processes in natural resource management system especially in areas of sustainable watershed development and planning. Morphometric characteristics are the viable entity to understand the hydrological behavior of the subwatershed. For prioritization of subwatershed, morphometric analysis was utilized by using the linear, areal, and relief aspects of the drainage basin. In this context, remote sensing and GIS has been proved to be an efficient tool to identify the morphological features. The Survey of India (SOI) topographical maps, satellite data IRS-LISS III, and Cartosat DEM data were utilized to understand the drainage pattern and also for prioritization of subwatershed areas. The prioritization of subwatershed has been attempted using novel and quantitative approaches based on compound parameter ranking for soil erosion. Lower compound factors were chosen as the most feasible for soil erosion. Based on the observation, eight subwatersheds with a higher degree of the slope were severely prone to soil erosion and remaining 21 subwatersheds occur in low-lying areas that can be developed as sustainable watersheds. The identified subwatershed requires immediate soil remediation and water conservation measures for efficient watershed planning and management. The proposed study might be helpful for resource planners, government agencies, private sectors, and other stake holders to take up soil conservation measures and fixation of water-harvesting structures for better decision making. Keywords Morphometry . DEM . Subwatershed . Compound factor . Prioritization . Lower Bhavani basin
Introduction Land and water resource development is precisely planned based on a watershed, since it depends upon parameters like
* Karunanidhi Duraisamy [email protected] 1
Department of Civil Engineering (Centre for Geoinformatics and Water Technology), Sri Shakthi Institute of Engineering and Technology, L&T By-Pass, Chinniyampalayam (Post), Coimbatore 641062, India
2
Department of Mining Engineering, Anna University, CEG Campus, Chennai 600025, India
3
Department of Earth Sciences, Pondicherry University, Kalapet, Puducherry 605014, India
4
Department of Agricultural Engineering (Centre for Geoinformatics and Water Technology), Sri Shakthi Institute of Engineering and Technology, L&T By-Pass, Chinniyampalayam (Post), Coimbatore 641062, India
topography, size, shape, landform, land use, vegetation cover, climate and socio-economic status. Watershed resources are interdependent, and they preserve natural resources from possible environmental damages (Adinarayana et al.
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