Concentration-discharge behavior as an indication of groundwater contribution in Copper Creek sub-catchment of the Upper East River Basin
Abstract
Groundwater in high elevation watersheds is difficult to quantify, but remains a major component in the hydrologic budget for the western United States. Concentration-discharge (C-Q) data can provide a framework for characterizing groundwater flow in small alpine catchments by indicating fluid residence times and solute fluxes. Such factors heavily influence biochemical processes and mixing behaviors downstream. Complimenting field measurements, End Member Mixing Analysis (EMMA) was conducted to apply a statistical approach for identifying solutes. Most small catchments exhibit chemostatic behavior which is defined as nearly constant solute concentration with changing discharge rates (Maher, 2011) therefore, SF6 and N2/Ar samples were collected to estimate fluid residence time and recharge temperature. We investigated these relationships in the Copper Creek sub-catchment by analyzing solute concentrations of anions, cations, and dissolved organic and inorganic carbon coupled with discharge measurements to assess its groundwater and solute contributions to East River.
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