naa a22 4500 510756654 CHVBK 20180411083125.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s12594-013-0183-7 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0183-7 Drainage morphometry of upper Vaigai river sub-basin, Western Ghats, South India using remote sensing and GIS [Elektronische Daten] [P. Prabu, R. Baskaran] The study area is a one of the sub-basin of Vaigai River basin in the Theni and Madurai districts, Western Ghats of Tamil Nadu. The Vaigai sub-basin extends approximately over 849 km2 and it has been sub-divided into 48 watersheds. It lies between 09°30′00″ and 10°00′00″N latitudes and 77°15′10″ and 77°45′00″ E longitudes in the western part of Tamil Nadu, India. It originates at an altitude of 1661m in the Western Ghats of Tamil Nadu in Theni district. The drainage pattern of these watersheds are delineated using geo-coded Indian remote sensing satellite (IRS) ID, linear image self-scanning (LISS) III of geo-coded false colour composites (FCC), generated from the bands 2, 3 and 4 on 1:50,000 scale in the present study. The Survey of India (SOI) toposheets 58G/5, 58 G/6, 58G/9 and 58G/10 on a scale of 1:50,000 scale was used as a base for the delineation of watershed. In the present study, the satellite remote sensing data has been used for updation of drainages and the updated drainages have been used for morphometric analysis. The morphometric parameters were divided in three categories: basic parameters, derived parameters and shape parameters. The data in the first category includes area, perimeter, basin length, stream order, stream length, maximum and minimum heights and slope. Those of the second category are bifurcation ratio, stream length ratio, RHO coefficient, stream frequency, drainage density, and drainage texture, constant of channel maintenance, basin relief and relief ratio. The shape parameters are elongation ratio, circularity index and form factor. The morphometric parameters are computed using ESRI's ArcGIS package. Drainage density ranges from 1.10 to 4.88 km/km2 suggesting very coarse to fine drainage texture. Drainage frequency varies from 1.45 to 14.70 which is low to very high. The bifurcation ratio ranges from 0.55 to 4.37. The low values of bifurcation ratios and very low values of drainage densities indicate that the drainage has not been affected by structural disturbances and also that the area is covered under dense vegetation cover. Elongation ratio ranges from 0.11 to 0.57. Drainage texture has the minimum of 1.63 and maximum of 11.44 suggesting that the drainage texture is coarse to fine. It is concluded that remote sensing and GIS have been proved to be efficient tools in drainage delineation and updation. In the present study these updated drainages have been used for the morphometric analysis. Geological Society of India, 2013 Morphometric nationallicence Remote sensing nationallicence GIS nationallicence Upper Vaigai nationallicence Western Ghats nationallicence Tamil Nadu nationallicence Prabu P. Department of Industries and Earth Sciences, Tamil University, 613 010, Thanjavur, India aut Baskaran R. Department of Industries and Earth Sciences, Tamil University, 613 010, Thanjavur, India aut Journal of the Geological Society of India Springer India 82/5(2013-11-01), 519-528 0016-7622 82:5<519 2013 82 12594 https://doi.org/10.1007/s12594-013-0183-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0183-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Prabu P. Department of Industries and Earth Sciences, Tamil University, 613 010, Thanjavur, India aut NATIONALLICENCE 700 1- Baskaran R. Department of Industries and Earth Sciences, Tamil University, 613 010, Thanjavur, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/5(2013-11-01), 519-528 0016-7622 82:5<519 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer