Analysis of longitudinal and transverse profiles in Seetha-Swarna and Gangolli rivers of coastal Karnataka, India

Udayashankar, H N (2011) Analysis of longitudinal and transverse profiles in Seetha-Swarna and Gangolli rivers of coastal Karnataka, India. International Journal of Earth Sciences and Engineering, 4 (7). pp. 297-304. ISSN 0974-5904

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The longitudinal profile of a stream is the continuous fall in elevation form origin to mouth. Many stream characteristics like Channel slope, Stream Length, Drainage area, and Bed load can be related to longitudinal and transverse profiles. A range of geological and hydrological factors combine to render most longitudinal profiles to be irregular. These factors are evaluated in this study by considering rivers in the two major watersheds i.e., Seetha-Swarna and Gangolli Composite River Systems of the newly formed Udupi district. Remote Sensing approach is adopted for the purpose. SOI toposheets and updated lineament maps by using the satellite imageries (Indian Remote Sensing satellites, IRS- 1C/IRS-1D) of the study area are used for the purpose. Various image processing techniques are adopted for the purpose. The stream is divided into three reaches for the purpose of analysis i.e., upper reach, middle reach and lower reach. The gradient indices which reflect the slope characteristics for these three reaches are calculated for all these rivers and the results are analysed. Many rivers and tributaries in the upper and mid-upper reaches show break in slopes in their longitudinal profiles. This indicates that the streams on the upper reach are structurally controlled. Transverse sections are steep at the origin (V shape) and widen below the Western Ghat and are flat at the alluvium region and river mouth.

Item Type: Article
Uncontrolled Keywords: Longitudinal profile, Transverse profile, Gradient index, Lineament map, structurally controlled, Remote sensing.
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 13 Feb 2014 09:05
Last Modified: 13 Feb 2014 09:05

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