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    Subsurface Hydrogeochemical Processes in Lower Bhavani River Basin, Tamil Nadu, India

    138070_14435_ISG1- 09 - P03 Subni.pdf (382.1Kb)
    Access Status
    Open access
    Authors
    Anandakumar, S.
    Subraman, T.
    Ramasamy, Nagarajan
    Elango, L.
    Date
    2009
    Type
    Conference Paper
    
    Metadata
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    Citation
    Anandakumar, S. and Subraman, T. and Ramasamy, Nagarajan and Elango, L. 2009. Subsurface Hydrogeochemical Processes in Lower Bhavani River Basin, Tamil Nadu, India, in ISG1 2009 (ed), Utilizing innovative technologies for sustainable Energy Resources 2009, Sep 5 2009, pp. 7-10. Miri, Sarawak, Malaysia: Curtin University of Technology, Miri, Sarawak, Malaysia.
    Source Title
    1st International conference on geology, (ISG1 2009) Curtin Sarawak
    Source Conference
    Utilizing innovative technologies for sustainable Energy Resources 2009
    ISBN
    978-983-441-76-1-1
    Faculty
    Sarawak
    Department of Science and Mathematics
    School of Engineering and Science
    Miri Campus
    School
    Curtin Sarawak - Faculty Office
    URI
    http://hdl.handle.net/20.500.11937/13326
    Collection
    • Curtin Research Publications
    Abstract

    Bhavani River is one of the important tributaries of Cauvery River, and originates in the Silent Valley range of Kerala State, India. The Lower Bhavani River Basin lies between 11 15' N and 11 45' N latitudes and 77 00' E and 77 40' E longitudes with an area of 2,475 km2. Variation of groundwater quality in an area is a function of physical and chemical parameters that are greatly influenced by geological formations, recharge-discharge mechanisms of groundwater and anthropogenic activities. The correlation of groundwater chemistry with hydrologic and geologic environments gives valuable information to understand the effect of these processes and to properly manage aquifer systems. A detailed study has been carried out to understand the subsurface hydrogeochemical processes that are responsible for the quality variation of groundwater. Residence time of groundwater was also considered to be an important parameter to study groundwater evolution. The NETPATH computer code was used to model the major subsurface processes contributing to the evolution of groundwater chemistry. The occurrence of such chemical processes as silicate weathering, carbonate dissolution, ion exchange and dilution due to rain were verified by performing inverse mass balance modeling using the same code. The net geochemical mass balance reactions between initial and final water were identified and quantified based on the flow in selected well pairs. The model output shows that dilution, ion exchange and illite precipitation are the dominant processes that control the chemistry of the groundwater along the flow paths. Calcite and NaCl dissolution are also involved to a certain extent. Reverse ion exchange process is also observed in two models.

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