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Full-Text Articles in Physical Sciences and Mathematics
Comparison Of The Chemical And Isotopic Composition Of Groundwater And Surface Water In The South Sound Region, Andrew H. Oberhelman
Comparison Of The Chemical And Isotopic Composition Of Groundwater And Surface Water In The South Sound Region, Andrew H. Oberhelman
Summer Research
This project seeks to characterize the chemical and isotopic compositions of groundwater and surface water in portions of Pierce and King Counties, with the goal of using these results to determine the water sources of local lakes. Specifically of interest are lakes studied by Puget Sound students over the past ~10 years where water analyses appear to define a mixing line, likely between surface runoff and the shallow groundwater (Figures 1, 2, and 3). Existing data pertain only to surface water from the lakes while data pertaining to groundwater is patchy or nonexistent and includes only a few of the …
Geochemistry And Origins Of Thermal Springs Waters Of The Olympic Peninsula And Cascade Range, Washington, Jon Kenneth K. Golla
Geochemistry And Origins Of Thermal Springs Waters Of The Olympic Peninsula And Cascade Range, Washington, Jon Kenneth K. Golla
Summer Research
The state of Washington contains 98 low temperature (surface temperatures between ~ 20 - 50 oC) geothermal springs, which are powered by the convective circulation of groundwater that is heated by the natural heat of the Earth. These systems operate in a cycle that begins when precipitation percolates downward into the subsurface and comes in contact with a heat source. Subsequently the heated water returns to the surface, in most cases, having interacted chemically with rocks in the reservoir and/or along its ascent path. Surveys done by the USGS between the 1970s – early 1990s show there is significant …
Using Stable Isotopes To Determine Resource Partitioning And The Role Of Anthropogenic Food Sources On Urban Populations Of Seattle And North Tacoma Raccoons (Procyon Lotor) And Opossums (Didelphis Virginiana), Mairan Smith
Summer Research
With increased urban space and human-wildlife interactions, there is a clear need for research directed towards urban wildlife in order to better manage land use, wildlife populations, and health concerns. No previous studies have quantified the role of anthropogenic food sources in raccoon and opossum diets. Corn, a C4 plant, is not found in Seattle and Tacoma except in processed human food, making it an excellent proxy for determining anthropogenic influence on wildlife diet. Raccoon diet in all regional populations is highly variable among individuals (range = 10 – 70% anthropogenic diet). For Seattle raccoons some of this variability is …