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Articles 1 - 10 of 10
Full-Text Articles in Physical Sciences and Mathematics
Turbidity Dynamics During High-Flow Storm Events In The Clackamas River, Oregon 2006-2012, Micelis Clyde Doyle
Turbidity Dynamics During High-Flow Storm Events In The Clackamas River, Oregon 2006-2012, Micelis Clyde Doyle
Dissertations and Theses
Turbidity is a useful parameter that can be utilized to help understand the water quality in a river and is an expression of the optical properties of a liquid that cause light rays to be scattered and absorbed rather than transmitted in straight lines. A total of 41 storm events occurring during water years 2006-2012 were analyzed for this study. A hysteresis index (HI) was used to assess the difference in turbidity on the rising and falling limbs of a storm-hydrograph. The upstream Carter Bridge site exhibited a clockwise (C) hysteresis in 38 of 41 storm events and counter-clockwise (CC) …
The Tension Between Technocratic And Social Values In Environmental Decision-Making: An'yang Stream Restoration In South Korea, Chang-Yu Hong
The Tension Between Technocratic And Social Values In Environmental Decision-Making: An'yang Stream Restoration In South Korea, Chang-Yu Hong
Dissertations and Theses
This dissertation examined the extent to which interests and values of diverse stakeholders were considered through participation-oriented decision-making. It covered the An' Yang Stream restoration case in South Korea, which has been judged a successful stream management endeavor led by public-private partnership governance.
This research utilized a mixed methods approach, combining qualitative and quantitative methods. It addressed the extent to which the collaborative and participatory decision-making processes incorporated diverse stakeholder values and visions. The relevant data on stream restoration was collected through nominal group technique (NGT), analytic hierarchy process (AHP), semi-structured interviews, observations at collaborative stakeholder meetings and workshops, and …
Assessing A Fluorescence Spectroscopy Method For In-Situ Microbial Drinking Water Quality, Taylor Jeffery Sharpe
Assessing A Fluorescence Spectroscopy Method For In-Situ Microbial Drinking Water Quality, Taylor Jeffery Sharpe
Dissertations and Theses
Waterborne disease is a significant contributor to the global burden of disease, in particular among high-risk populations in developing nations. State-of-the-art methods for the enumeration of microbial pathogens in drinking water sources have important limitations, including high initial cost, 24-48 hour delays in results, high staffing and facility requirements, and training requirements which all become especially problematic in the developing nation context.
A number of alternative approaches to microbial water quality testing have been proposed, with the goal of decreasing the required testing time, decreasing overall costs, leveraging appropriate technology approaches, or improving sensitivity or specificity of the water quality …
Analyzing Dam Feasibility In The Willamette River Watershed, Alexander Cameron Nagel
Analyzing Dam Feasibility In The Willamette River Watershed, Alexander Cameron Nagel
Dissertations and Theses
This study conducts a dam-scale cost versus benefit analysis in order to explore the feasibility of each the 13 U.S. Army Corps of Engineers (USACE) commissioned dams in Oregon’s Willamette River network. Constructed between 1941 and 1969, these structures function in collaboration to comprise the Willamette River Basin Reservoir System (WRBRS). The motivation for this project derives from a growing awareness of the biophysical impacts that dam structures can have on riparian habitats. This project compares each of the 13 dams being assessed, to prioritize their level of utility within the system. The study takes the metrics from the top …
Design And Application Of A 3d Photocatalyst Material For Water Purification, Simon Paul Fowler
Design And Application Of A 3d Photocatalyst Material For Water Purification, Simon Paul Fowler
Dissertations and Theses
This dissertation presents a method for enhancement of the efficiency and scalability of photocatalytic water purification systems, along with an experimental validation of the concept. A 3-dimensional photocatalyst structure, made from a TiO2-SiO2 composite, has been designed and fabricated for use in a custom designed LED-source illumination chamber of rotational symmetry that corresponds with the symmetry of the photocatalyst material. The design of the photocatalyst material has two defining characteristics: geometrical form and material composition. The design of the material was developed through the creation of a theoretical model for consideration of the system's photonic efficiency. Fabrication …
Wicked Water Problems: Can Network Governance Deliver? Integrated Water Management Case Studies From New Zealand And Oregon, Usa, Jacqueline Dingfelder
Wicked Water Problems: Can Network Governance Deliver? Integrated Water Management Case Studies From New Zealand And Oregon, Usa, Jacqueline Dingfelder
Dissertations and Theses
Integrated water management is a wicked public policy problem with no clear path to resolution. This dissertation is an in-depth qualitative comparative analysis of two collaborative governance processes created to tackle complex water problems in New Zealand and Oregon, U.S.A. Both cases convened a wide range of state and non-state actors in efforts to find common ground, build consensus for change, and develop innovative water policy solutions.
The goal of this comparative case study analysis is to gain a better understanding of collaborative network governance frameworks as applied to integrated water management and primary factors for success. The proposition posits …
Influence Of Mixing And Buoyancy On Competition Between Cyanobacteria Species In Upper Klamath Lake, Roberta Joann Brunkalla
Influence Of Mixing And Buoyancy On Competition Between Cyanobacteria Species In Upper Klamath Lake, Roberta Joann Brunkalla
Dissertations and Theses
Cyanobacterial blooms in lakes impact human health, the economy, and ecosystem health. It is predicted that climate change will promote and increase the frequency and intensity of cyanobacterial blooms due to unique physiological adaptions that allow cyanobacteria to exploit warm stable water bodies. Key cyanobacteria physiological adaptions include nitrogen fixation, buoyancy regulation and higher optimum growth temperatures. The largest uncertainty of predicting the effect of climate change is in understanding how the interactions among species will change. Adding to the ambiguity, cyanobacteria physiological adaptions can vary based on lakespecific ecotypes and can have different sensitivities to temperature. It is critical …
The Effects Of Scale Variation On Single-Family Residential Water Use In Portland, Or, Matthew Ryan Lee Bonnette
The Effects Of Scale Variation On Single-Family Residential Water Use In Portland, Or, Matthew Ryan Lee Bonnette
Dissertations and Theses
With growing urban populations and increasing concerns over the effects of climate change on water supplies, there has recently been a significant amount of interdisciplinary research focused on identifying the drivers of urban water use. Due to unavailability of individual or household level data, these studies are often limited to using spatially aggregated data. There is concern that this aggregation of data may be leading to misrepresentations of the drivers of urban water use, yet there have been few studies that have addressed this concern. As in all spatial quantitative analyses, studies in this area should consider how the spatial …
Root-Enhanced Infiltration In Stormwater Bioretention Facilities In Portland, Oregon, Ted David Hart
Root-Enhanced Infiltration In Stormwater Bioretention Facilities In Portland, Oregon, Ted David Hart
Dissertations and Theses
I evaluated the effectiveness of plant roots to increase infiltration rates within stormwater bioretention facilities (SBFs), roadside planter compartments that filter stormwater. SBFs attenuate harmful effects of stormwater by reducing peak flow and retaining pollutants, with increased infiltration that improves both these functions. Researchers have shown that roots can increase infiltration within greenhouse, lab, field, and test SBF settings. However, no researchers have yet measured either the extent to which different root characteristics can increase infiltration or the variation in root characteristics and their effect on infiltration rates among plant assemblages within currently functioning SBFs.
To determine if root-enhanced infiltration …
Hydrodynamic And Water Quality Modeling Of The Chehalis River Using Ce-Qual-W2, Sarah Van Glubt
Hydrodynamic And Water Quality Modeling Of The Chehalis River Using Ce-Qual-W2, Sarah Van Glubt
Dissertations and Theses
The Chehalis River Basin is located in the southwest region of Washington State, originating in the Olympic Mountains and flowing to Grays Harbor and the Pacific Ocean. The Chehalis River is over 125 miles, exists within five counties, and flows through agricultural, residential, industrial, and forest land areas. Four major rivers discharge to the Chehalis River, as well as many smaller creeks, five wastewater treatment plants, and groundwater flows.
Flooding is a major problem in the relatively flat areas surrounding the cities of Chehalis and Centralia, with severe consequences for property, safety and transportation. As a result, construction of a …