Portland State University. Department of Geology
Ansel G. Johnson
Date of Award
Master of Science (M.S.) in Geology: Geohydrology
1 online resource (151 p.)
Groundwater temperature -- Oregon -- Columbia River Gorge (Or. and Wash.), Groundwater -- Thermal properties
Groundwater temperature data, collected at an alluvial terrace located on the Oregon shore of the Columbia River downstream from Bonneville Darn, was analyzed in order to characterize and formulate a conceptual model of the thermal data for the groundwater system in the terrace. There is concern that an unlined entrance channel for a new navigation lock, to be located down the middle of the terrace, will widen the range of temperatures in the fish hatchery-groundwater supply. The analysis of temperature behavior in the terrace supports the hydraulic observations derived from analysis of pump test data, but with greater definition of the more subtle behavior of the groundwater system not readily discernible in the pump test data. The thermal behavior of the terrace groundwater system is governed by: 1) the stratigraphy of the terrace, 2) its groundwater recharge characteristics, 3) thermal influence from the Columbia River, and 4) stress placed on the aquifer system due to pumping of fish hatchery wells located in the terrace.
Malin, Richard Stephen, "Interpretation of the thermal behavior of groundwater in an alluvial terrace : Bonneville Dam, Columbia Gorge, Oregon" (1991). Dissertations and Theses. Paper 4207.