Journal
ENVIRONMENTAL EARTH SCIENCES
Volume 64, Issue 2, Pages 373-381Publisher
SPRINGER
DOI: 10.1007/s12665-010-0860-4
Keywords
Morphometric analysis; Papanasam and Manimuthar watersheds; Western Ghats; GIS; Watershed management
Funding
- State Land Use Board, State Planning Commission, Government of Tamil Nadu
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A morphometric analysis was carried out to describe the topography and drainage characteristics of Papanasam and Manimuthar watersheds. These watersheds are part of Western Ghats, which is an ecologically sensitive region. The drainage areas of Papanasam and Manimuthar watersheds are 163 and 211 km(2), respectively and they show patterns of dendritic to sub-dendritic drainage. The slope of both watersheds varied from 0A degrees to 59A degrees and 0A degrees to 55A degrees, respectively. Moreover, the slope variation is chiefly controlled by the local geology and erosion cycles. Each watershed was classified as a fifth-order drainage basin. The stream order of the basin was predominantly controlled by physiographic and structural conditions. The increase in stream length ratio from lower to higher order suggests that the study area has reached a mature geomorphic stage. The development of stream segments is affected by rainfall and local lithology of the watersheds.
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