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Groundwater Contributions to Discharge in a Permafrost Setting, Big Fish River, N.W.T., Canada
Ian D. Clark, Bernard Lauriol, Lois Harwood and Mark Marschner
Arctic, Antarctic, and Alpine Research
Vol. 33, No. 1 (Feb., 2001), pp. 62-69
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1552278
Page Count: 8
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Groundwaters, surface runoff and river discharge have been studied at the Fish Hole area of the Big Fish River catchment, near Aklavik, N.W.T., to quantify the seasonal variations in groundwater contributions to baseflow in a permafrost basin. Geochemical and isotope methods are used to distinguish three principal water types: (1) subpermafrost Na-Cl thermal waters (16°C) discharging from bedrock along the river, (2) shallow, Ca-SO4 groundwaters, and (3) low-salinity, Ca-HCO3, suprapermafrost drainage. Cl and SO4 concentrations in river water show that baseflow is largely derived from groundwater sources (Na-Cl and Ca-SO4 components), with less than 30% contributed from surface water runoff in any season. Thermal groundwaters discharge year-round at a calculated 1.6 m3 s-1. The shallow, Ca-SO4 groundwater is the dominant component of baseflow in summer but is absent in winter baseflow. Discharge analysis based on a single flow measurement (25.5 m3 s-1 in June, 1997) and Cl-dilution allows calculation of total river discharge. This is shown to vary from a low of 2.2 m3 s-1 in the winter, to 1050 m3 s-1 during early spring melt.
Arctic, Antarctic, and Alpine Research © 2001 Regents of the University of Colorado, a body corporate, contracting on behalf of the University of Colorado at Boulder for the benefit of INSTAAR