Location and Assessment of Groundwater Dischargeby D. R. Lee, Chalk River Lab, Chalk River, Canada,
G. M. Milton, Chalk River Lab, Chalk River, Canada,
R. J. Cornett, Chalk River Lab, Chalk River, Canada,
S. J. Welch, Chalk River Lab, Chalk River, Canada,
Abstract: Methods have been developed for locating and measuring groundwater discharges, which are often obscured by the presence of overlying surface water. A sediment probe, towed behind a moving boat at a rate of 1 m s-1, provided a rapid reconnaissance of sediment temperature and bulk electrical conductance over large areas and indicated locations of discharge areas. Vertical-solute profiles in the upper metre of sediment in submerged discharge areas provided model estimates of upward advection, in agreement with Darcy estimates, for flows as low as 0.1 m a-1. Having established several sites where saline groundwaters seep to surface, we are now prepared to apply these two techniques concurrently at the same site to further validate their utility.
Subject Headings: Water discharge measurement | Groundwater | Salt water | Hydrologic models | Water resources | Sediment transport | Surface water
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