Chapter-Ill Analysis of River Longitudinal Profiles 121
120 Chapter-Ill Analysis of river longitudinal profiles 121 Chapter III ANALYSIS OF RIVER LONGITUDINAL PROFILES 3.1. Introduction: Rivers are the most sensitive and dynamic elements of the landscape. The shape of the longitudinal profile of a river is result of the complex interplay between lithology, structure, tectonics, climate and catchment hydrology. In a large number of studies, the river longitudinal profiles have been investigated in order to identify the areas experiencing tectonic deformation and uplift (Begin, 1975; Seeber and Gornitz, 1983; Rice and Church, 2001; Chen et al., 2006; Lee and Tsai, 2009; Whittaker, 2012 and the references therein). In addition to this, the influence of climate and hydrological processes on the longitudinal profiles of the rivers has been investigated (Roe et al., 2002; Zaprowski et al., 2005). Other studies concerned with the long profile analysis include understanding of the role of lithology (Begin, 1975; Bishop et al., 1985; Goldrick and Bishop, 1995), distribution of stream power (Sklar and Dietrich, 1998; Snyder et al., 2000), identification of knick zones (Perez-Pena et al., 2009; Pederson and Tressler, 2012) and description of long profile shape (Shepherd, 1985; Rice and Church, 2001). In this chapter, the characteristics of the longitudinal profiles of the rivers of the Kaveri, Palar and Ponnaiyar Basins and their tributaries are described and an attempt is made to understand whether there is any effect of tectonics on their long profiles as suggested by Valdiya (2001). 3.2. Methodology: In all, the longitudinal profiles of 21 major tributaries of the Kaveri River, 8 tributaries of the Palar and 6 tributaries of the Ponnaiyar River, as well as the profiles of the main channels of the Kaveri, Palar and Ponnaiyar Rivers were extracted and analysed in ArcGIS.
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