[This article belongs to Volume - 56, Issue - 01, 2024]
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-09-05-2024-46

Niranjana Thomas1, Dr. E. J. James2, Dr. Celine George3

Abstract :

Periyar River basin is the second largest river basin in Kerala, which is spread over three districts in Kerala. This basin consists of several reservoirs such as Mullaperiyar, Idukki, Idamalayar, Lower Periyar etc. Morphometric analysis for the Periyar river basin was worked out using Remote Sensing and Geographical Information System (GIS). Nine subwatersheds were delineated within the basin to calculate morphometric parameters. In this study, the morphometric parameters such as Stream Order (U), Stream Length (Lu), Mean Stream length (Lsm), Stream Frequency (Fs), Drainage Density (Dd), Texture Ratio (T), Length of Overland Flow (Lof), Elongation Ratio (Re), Circularity Ratio (Rc), Form Factor (Rf), Bifurcation Ratio (Rb) and Relief Ratio (Rh) were calculated for the Periyar river basin. Using these tabulated morphometric parameters of subwatersheds, prioritization ranks for subwatersheds were allocated. According to the analysis, Periyar is categorized as an 8th order stream, with the upstream area being identified as the highest priority. This morphometric study provides a better understanding of the Periyar river basin which helps the future development of the basin. GIS based river basin analysis gives accurate data to create a digital drainage network of the basin, watershed management plan and hydrological inference.