Deuterium and oxygen-18 were used as natural tracers to investigate the hydraulic relationship between the Columbia River and the Blue Lake gravel aquifer near Portland, Oregon. A time series of stable-isotope data collected from surface and ground waters during a March 1990 aquifer test confirms that the river and aquifer are hydraulically connected. Calculations based on simple mixing show that the river contributed 40-50% of the yield of three wells after 5-6 days of pumping. Data collected during August 1990, show that the river contributed 65-80% of the yield of one well after 22 days of pumping and indicate that the contribution of the river was still increasing. ?? 1992.
Additional publication details
The dynamic relationship between ground water and the Columbia River: using deuterium and oxygen-18 as tracers