Index Catalog // ScholarsArchive@OSU

Distribution of bioavailable metals and a human health risk assessment from fish and crayfish in the lower Willamette River, Oregon

Creator:: Krissanakriangkrai, Oraphin
Abstract:: In this study the impact of episodic events on levels of bioavailable trace metals Zn, Cu, Cr, Cd, Pb, and As (III) were determined for the lower Willamette River in Oregon. In addition, a comparison among three alternative methods for estuary sampling was conducted. Potential adverse human health risk associated...
Resource Type:: Dissertation
Full Text:: lower Willamette River, Oregon. To provide an evaluation of methods for environmental sampling

Riparian cover changes associated with flow regulation and bank stabilization along the Upper Willamette River in Oregon between 1939 and 1996

Creator:: Gutowsky, Sharon L.
Abstract:: This study investigates riparian cover change between 1939 and 1996 utilizing aerial photography, bank conditions and stream gauge data. Three sites under 1.0 km2, along a 10- km reach north of Harrisburg, Oregon, were evaluated. The cover classification scheme included 18 classes composed of 3 canopy densities and 8 structural...
Resource Type:: Masters Thesis

The accumulation of cadmium, copper and nickel in freshwater mussels (Margaritifera margaritifera), algae (Cladophora sp.), and sediment from Elk Creek, Oregon

Creator:: Sigismondi, Linda A.
Abstract:: Concern about heavy metal pollution has increased during the past decade in which studies have shown that heavy metals are accumulating in the environment and that these metals, in excess, are toxic to organisms, including man. Because of this concern, scientists have suggested the use of indigenous organisms as monitors...
Resource Type:: Masters Thesis
Full Text:: , OREGON. Redacted for Privacy Abstract approved: Dr. Michael C. Mix Concern about heavy metal pollution

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Creator:: Sobota, Daniel J.
Abstract:: Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
Resource Type:: Dissertation
Full Text:: study reaches in the Willamette River basin, Oregon, USA………………………………………………………………..15

Determinants of microbial community structure and substrate utilization potential in soils of vegetable cropping systems

Creator:: Schutter, Mary E.
Abstract:: The Oregon Long-Term Soil Quality Project was initiated to identify soil properties that respond rapidly to alternative management practices. Such practices included winter cover cropping, which was implemented at two experimental research stations and several grower fields throughout the Willamette Valley. The goal of this thesis was to identify the...
Resource Type:: Dissertation
Full Text:: approved: Richard P. Dick The Oregon Long-Term Soil Quality Project was initiated to identify soil

Quantification of the nitrate attenuation capacity of low-permeability Missoula Flood deposits in the Willamette Valley of Oregon

Creator:: Arighi, Louis M.
Abstract:: Low-permeability geologic units may offer significant chemical and hydraulic protection of adjacent aquifers, and are important for managing groundwater quality, especially in areas with significant non-point source contamination. Nitrate in the Willamette Valley is attenuated across the Willamette Silt, a semi-confining unit overlying a regionally important aquifer. To quantify the...
Resource Type:: Masters Thesis
Full Text:: Capacity of Low-Permeability Missoula Flood Deposits in the Willamette Valley of Oregon Abstract approved

Temporal and spatial variability of groundwater nitrate in the southern Willamette Valley of Oregon

Creator:: Mutti, Jeffrey Glenn
Abstract:: Groundwater nitrate contamination is a well-documented issue in the Southern Willamette Valley (SWV) of Oregon, as a Groundwater Management Area (GWMA) has recently been declared. As a GWMA, groundwater nitrate monitoring must occur until regional concentrations are below 7 mg/L NO3-N. However, the presence of temporal variability can make it...
Resource Type:: Masters Thesis
Full Text:: -documented issue in the Southern Willamette Valley (SWV) of Oregon, as a Groundwater Management Area (GWMA

Farm level response to agricultural effluent control strategies : the case of the Willamette Valley

Creator:: Taylor, Michael L. (Michael Lester), 1960-
Abstract:: Changes in the structure of the U.S. agricultural industry since World War II have transformed it into a highly productive component of the domestic economy. But these changes have not occurred without indirect costs. For example, the reliance on agricultural chemicals has produced environmental effects causing growing concern. In addition,...
Resource Type:: Dissertation
Full Text:: , Oregon. 111-4 Surface water pollution from nonpoint sources in the Willamette River Basin. 68 11I-5

Arsenic in ground water of the Willamette Basin, Oregon

Creator:: Hinkle, Stephen R., Polette, Danial J., and Oregon. Water Resources Dept., Geological Survey (U.S.)
Abstract:: Arsenic concentrations exceeding the U.S. Environmental Protection Agency (USEPA) current Maximum Contaminant Level (MCL) of 50 micrograms per liter are widespread in ground water in the Willamette Basin. The Oregon Water Resources Department and the U.S. Geological Survey began a cooperative study in the Willamette Basin in 1996. One goal...
Resource Type:: Technical Report
Full Text:: 12,000-square-mile basin in northwestern Oregon Primary drainage is by the Willamette River, but for the

Passive sampling devices as biological surrogates for evaluating seasonal bioavailability of hydrophobic organic contaminants in surface water

Creator:: Sethajintanin, Doolalai
Abstract:: The seasonal distribution of bioavailable organochiorine contaminants in surface water and the potential environmental factors influencing their bioavailability were evaluated. The study was carried at the lower Willamette River at Portland Harbor, Oregon where surface water runoff varied according to season. Bioavailable water concentrations of DDTs and PCBs were determined...
Resource Type:: Dissertation
Full Text:: bioavailability were evaluated. The study was carried at the lower Willamette River at Portland Harbor, Oregon

ScholarsArchive@OSU

Distribution of bioavailable metals and a human health risk assessment from fish and crayfish in the lower Willamette River, Oregon

Riparian cover changes associated with flow regulation and bank stabilization along the Upper Willamette River in Oregon between 1939 and 1996

The accumulation of cadmium, copper and nickel in freshwater mussels (Margaritifera margaritifera), algae (Cladophora sp.), and sediment from Elk Creek, Oregon

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Determinants of microbial community structure and substrate utilization potential in soils of vegetable cropping systems

Quantification of the nitrate attenuation capacity of low-permeability Missoula Flood deposits in the Willamette Valley of Oregon

Temporal and spatial variability of groundwater nitrate in the southern Willamette Valley of Oregon

Farm level response to agricultural effluent control strategies : the case of the Willamette Valley

Arsenic in ground water of the Willamette Basin, Oregon

Passive sampling devices as biological surrogates for evaluating seasonal bioavailability of hydrophobic organic contaminants in surface water

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