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    River and basin morphometric indexes to detect tectonic activity: a case study of selected river basins in the South Indian Granulite Terrain (SIGT)

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    Authors
    Hamza, Vijith
    Prasannakumar, V.
    Sharath Mohan, M.
    Ninu Krishnan, M.
    Pratheesh, P.
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Hamza, V. and Prasannakumar, V. and Sharath Mohan, M. and Ninu Krishnan, M. and Pratheesh, P. 2017. River and basin morphometric indexes to detect tectonic activity: a case study of selected river basins in the South Indian Granulite Terrain (SIGT). Physical Geography. 38 (4): pp. 360-378.
    Source Title
    Physical Geography
    DOI
    10.1080/02723646.2017.1283478
    ISSN
    0272-3646
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/63454
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Informa UK Limited, trading as Taylor & Francis Group. The effects and influence of tectonic processes on the Anjarakandy, Thalassery, Mahe, and Kuttiyadi watersheds and rivers of the South Indian Granulite Terrain in Kerala were examined to determine their spatial heterogeneity. Drainage basin asymmetry (Af), transverse topographic symmetry factor (T), hypsometric integral and curve (HI), longitudinal profile, stream length gradient index (SL), and stream concavity index (SCI) suggest heterogeneity in tectonic influence. Clusters of geomorphic anomalies in similar lithology rule out lithologic control on drainage development. However, the orientations of the drainage networks and predominant fractures/lineaments compare closely and reveal strong tectonic influence. Though the watersheds are considered to be in an advanced stage of erosion by the low HI ( < 30) and high values of SCI, variations in the shape of the hypsometric curves and differences in the SCI values indicate the different influence of tectonic process from watersheds in the north to the south. Among the watersheds, the Mahe and Kuttiyadi are more sensitive to tectonic processes than the Anjarakandy and Thalassery and indicate spatial heterogeneity in the influence of tectonic activity, confirming the grouping of watersheds based on structural and drainage patterns.

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