BibTeX:

@article{IJIRSTV2I10078,
     title={GIS and Hypsometry based analysis on the Evolution of Sub Basins of Ponnaiyar River, Krishnagiri district, Tamilnadu.},
     author={Pradeep.P and Dr. M.S.Vinaya},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={2},
     number={10},
     pages={210--217},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV2I10078.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

GIS aided hypsometric analysis of a river basin is generally used to understand the stage of geomorphic evolution (youth, mature and old). The present study focuses on identifying the growth stage of Ponniyar river sub basins based on the shape of the hypsometric curve and hypsometric integral value. The study area geographically lies between the latitudes 12˚.15́ N & 12˚55́ N and longitudes 77˚ 15́ E & 78˚ 45́ E. The six sub basins of Ponaiyar River are analysed in the present study which include Chinnar basin-A, Chinnar basin-B1, Chinnar basin-B2, Ponnaiyar basin, Marakandanadhi basin and Veppanapalli basin. The drainage network for all the above six sub basins were extracted from Survey of India Topographical Maps of 1:50,000 scale. ASTER DEM product was used to prepare elevation contours with 20 m interval. The Hypsometric Curves for the sub basins were prepared using Strahler’s Percentage Method (1952), from which the ratios a/A and h/H were plotted. Hypsometric integrals were estimated using Elevation relief ratio method. The results show that the hypsometric integral values range between 0.45 and 0.56 indicating mature stage development for all the river basins. However, the values of 0.55 and 0.56 obtained for Veppanapalli basin and Marakandanadhi basin are close to the lower limit of the youthful stage value range which reveals that these two basins are in the early mature stage. The hypsometric shapes for Chinnar basin–B2 and Marakandanadhi basins are slightly convex indicating that they have just completed the youth stage and presently at the early mature stage.

Equilibrium stage, GIS, Hypsometric curve, Hypsometric integral, Sub basins