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    Hydrologic response of catchments to precipitation: Quantification of mechanical carriers and origins of water

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    Issue Date
    2011-12-15
    Author
    Park, Y. J.
    Sudicky, E. A.
    Brookfield, Andrea E.
    Jones, J. P.
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    [1] Precipitation-induced overland and groundwater flow and mixing processes are quantified to analyze the temporal (event and pre-event water) and spatial (groundwater discharge and overland runoff) origins of water entering a stream. Using a distributed-parameter control volume finite-element simulator that can simultaneously solve the fully coupled partial differential equations describing 2-D Manning and 3-D Darcian flow and advective-dispersive transport, mechanical flow (driven by hydraulic potential) and tracer-based hydrograph separation (driven by dispersive mixing as well as mechanical flow) are simulated in response to precipitation events in two cross sections oriented parallel and perpendicular to a stream. The results indicate that as precipitation becomes more intense, the subsurface mechanical flow contributions tend to become less significant relative to the total pre-event stream discharge. Hydrodynamic mixing can play an important role in enhancing pre-event tracer signals in the stream. This implies that temporally tagged chemical signals introduced into surface-subsurface flow systems from precipitation may not be strong enough to detect the changes in the subsurface flow system. It is concluded that diffusive/dispersive mixing, capillary fringe groundwater ridging, and macropore flow can influence the temporal sources of water in the stream, but any sole mechanism may not fully explain the strong pre-event water discharge. Further investigations of the influence of heterogeneity, residence time, geomorphology, and root zone processes are required to confirm the conclusions of this study.
    Description
    This is the published version. Copyright American Geophysical Union
    URI
    http://hdl.handle.net/1808/19221
    DOI
    https://doi.org/10.1029/2010WR010075
    Collections
    • Kansas Geological Survey Scholarly Works [39]
    Citation
    Park, Y.-J., E. A. Sudicky, A. E. Brookfield, and J. P. Jones. "Hydrologic Response of Catchments to Precipitation: Quantification of Mechanical Carriers and Origins of Water." Water Resources Research Water Resour. Res. 47.12 (2011): n. pag. DOI:10.1029/2010WR010075

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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