A Quantitative Analysis of Watershed Morphology Using Geo-Spatial Approach
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2019, Vol 9, Issue 4
Abstract
A study was conducted from Kumulur watershed, Trichy district, Tamil Nadu located at latitude and longitude of10°56'41.50"N-10°55'57.85"N&78°50'4.34"E-78°50'4.58"E, respectively with an areal extent of 848694 sq. m. The spatial data of Digital Elevation Model (DEM) of 4-meter resolution and satellite imagery(Google Earth) were used for the extraction of the watershed characteristics through morphometric analysis. The hydrological module of ArcGIS software was used to analyze the geospatial data. The watershed was therein delineated and the various parameters for the morphometric analysis viz., stream order (U), stream number (Nu), stream length (Lu), mean stream length (Lsm), stream length ratio (RL), bifurcation ratio (Rb), drainage density (Dd), drainage texture (T), stream frequency (Fs), form factor (Ff), elongation ratio (Re), circularity ratio (Rc), relief (R) and relief ratio (Rr)were calculated using the software. The basin morphometry shows the numerical analysis and mathematical quantification of different aspects of the watershed. The morphometric analysis includes aspects such as linear, areal & relief. The area and perimeter of the basin was calculated as 848694 sq. m. and 4923.06 m respectively. The total number of streams were found to be 213 and the total stream length of the watershed was calculated as 12833.6240 mof all the 4 stream orders forming a dendritic type of drainage pattern. The maximum length of the stream for the entire basin was observed to be 315.532 m. The bifurcation ratio of the basin varied from 1.543 to 5.000; the elongation ratio and the circularity ratio of the drainage basin were calculated as 0.5967 and 0.4398 respectively. The highest and lowest elevation of the watershed were observed to be 102.021 and 68.786 m which delivered the relief as 33.235 m and the relief ratio as 0.019.
Authors and Affiliations
Mercy Backiyam . J, Nagarajan . M, Lalitha R
Keywords
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- EP ID EP649214
- DOI 10.24247/ijasraug201927
- Views 145
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