Modeling catchment-scale mixing in the near-stream zone-Implications for chemical and isotopic hydrograph separation

Details Modeling catchment-scale mixing in the near-stream zone-Implications for chemical and isotopic hydrograph separation Modeling catchment-scale mixing in the near-stream zone-Implications for chemical and isotopic hydrograph separation

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30b..63c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 2, pp. 63-1, CiteID 1091, DOI 10.1029/2002GL016265

Physics

1

Hydrology: Runoff And Streamflow, Hydrology: Surface Water Quality, Hydrology: Chemistry Of Fresh Water

Scientific paper

The saturated region immediately surrounding the stream channel has been characterized as a zone of active mixing, but the dynamics of this process are not accounted for in conventional hydrograph separations. We employ a simple mixing model to explore the possible consequences. Chemically distinct ``hillslope'' and ``groundwater'' runoff components are routed through a ``near-stream'' reservoir, representing the channel and surrounding alluvium, to produce streamflow. For physically plausible near-stream zones, groundwater contributions estimated from hydrograph separation on streamflow ranged from 45 to 80 percent larger than the ``true'' inflow values on the rising limb, and 19 to 57 percent larger at peak flow. The overestimates resulted from a near-stream reservoir-induced lag in the hillslope chemical signature relative to increases in hillslope water flux, and were consistent for reservoir dynamics ranging from constant-volume to linear. The results suggest that caution be exercised when interpreting hydrograph separations without knowledge of the hydrology of the near-stream zone.

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