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    Morphotectonics of a small river basin in the South Indian granulite terrain: An assessment through spatially derived geomorphic indices

    Access Status
    Fulltext not available
    Authors
    Hamza, Vijith
    Prasannakumar, V.
    Krishnan, M.
    Pratheesh, P.
    Date
    2015
    Collection
    • Curtin Research Publications
    Type
    Journal Article
    Metadata
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    Abstract

    © 2015 Taylor & Francis.ABSTRACT: Neotectonic activity in Mahe (Mayyazhi) river basin and its implication in landform development and stream characteristics were investigated with the help of the digital elevation model-derived geomorphic indices. The analysis is based on the commonly used geomorphic indices such as hypsometric curve and integral, drainage basin asymmetry, transverse topographic symmetric factor (T), stream length (SL) gradient index and longitudinal profiles of the stream. Hypsometric integrals indicate that the basin has reached the base level and lesser amount of material remains for erosion and transportation. The basin is asymmetric and has a south-south-east directional tilt, but with a probable spin caused due to the presence of major strike slip fracture, the mouth portion of the Mahe river has been tilted towards north-north-west. The SL index with sudden and non-uniform variations supports the finding and indicates the relative tectonic activity and its influence over the river networks in the area. Longitudinal profile of the stream also reveals gradational changes in the profile with the presence of knick points. Cross comparison of the analysed geomorphic indices points towards neotectonic activity in the basin, which modified the river basin to the present morphology and is reflected in the characteristics of the river and the basin as a whole.

    Citation
    Hamza, V. and Prasannakumar, V. and Krishnan, M. and Pratheesh, P. 2015. Morphotectonics of a small river basin in the South Indian granulite terrain: An assessment through spatially derived geomorphic indices. GeoRisk. 9 (3): pp. 187-199.
    Source Title
    GeoRisk
    URI
    http://hdl.handle.net/20.500.11937/53315
    DOI
    10.1080/17499518.2015.1074251
    Department
    Curtin Sarawak

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