Abstract
From three different sources viz. survey of India topographic map (1:50,000), CartoDEM (10 mts) and Aster GDEM (30 mts) morphometric parameters are derived and evaluated. Manually digitized the drainage network from toposheets and extracted drainage network system from CartoDEM and Aster GDEM using ArcGIS 10.2 software. Basic, derived and shape parameters are considered for basin analysis. The mean bifurcation ratio of the given basin for CartoDEM & Aster GDEM are having nearby values and also indicates some sort of geological control, high stream frequency (Fs) is indicative of high relief and low infiltration capacity of the bedrock pointing towards the increase in stream population with respect to increase in drainage density, low drainage density (Dd) leads to coarse drainage texture, value of Lg for topographic, CartoDEM and Aster GDEM data indicating very fine texture & fine texture respectively. From the shape parameters the Kumudvathi watershed indicates it is sub-circular and elongated. The results from the high resolution data will have the nearby values and less of % variation, whereas in low resolution data % of variation is more and will not meet criteria.
Highlights
Drainage basin is a basic unit in morphometric analysis because all the hydrologic and geomorphic processes occur within the watershed where denudational and aggradational processes are most explicitly manifested
The perimeter of the Kumudvathi basin is 107.63 kms for Toposheet (Figure 4), whereas the watershed derived from the CartoDEM & Aster Global Digital Elevation Model (GDEM) data using pour points methods is 109.27 km and 134.6 km respectively
Kumudvathi watershed is a hilly terrain in eastern side of the basin with moderate to steep slope (Figure 5) which is clearly depicted by CartoDEM and Aster GDEM
Summary
Drainage basin is a basic unit in morphometric analysis because all the hydrologic and geomorphic processes occur within the watershed where denudational and aggradational processes are most explicitly manifested. Morphometry is the measurement and arithmetical investigation of design of the earth's surface, shape and dimension of its landforms (Agarwal, 1998; Obi Reddy et al, 2002). A most important consequence in geomorphology over the past several decades has been on the growth of quantitative physiographic process to describe the progression and actions of surface drainage networks (Horton, 1945; Leopold & Maddock, 1953)
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