Digital Commons Network^™

Spatiotemporal Analysis Of Soil Quality Degradation And Emissions In The State Of Iowa (Usa), Elena A. Mikhailova, Hamdi A. Zurqani, Lili Lin, Zhenbang Hao, Christopher J. Post, Mark A. Schlautman, Gregory C. Post

Geography Faculty Publications and Presentations

The concept of soil quality (SQ) is defined as the soil's capacity to function, which is commonly assessed at the field scale. Soil quality is composed of inherent (soil suitability) and dynamic (soil health, SH) SQ, which can also be analyzed using geospatial tools as a SQ continuum (SQC). This study proposes an innovative spatiotemporal analysis of SQ degradation and emissions from land developments using the state of Iowa (IA) in the United States of America (USA) as a case study. The SQ degradation was linked to anthropogenic soil (SD) and land degradation (LD) in the state. More than 88% …

Webinar: Marginalized Populations’ Access To Transit, Marisa Zapata

TREC Webinar Series

How do people with intersecting marginal identities experience social exclusion as they travel via mass transit? To answer this question, PSU researchers employed a qualitative method less common in transportation studies: photovoice. Researchers asked participants to describe the factors that shape their travel behavior and provide photographic data of their experiences. Then, they conducted in-depth video interviews to gain further depth and clarity regarding the visual data. The findings from this study can help transit system designers better understand how experiences of harassment and discrimination across the entire users’ journey affects the riders’ decisions about whether and when to take …

Patterns, Drivers, And Implications Of Postfire Delayed Tree Mortality In Temperate Conifer Forests Of The Western United States, Sebastian Busby, Cody Evers, Andrés Holz

Geography Faculty Publications and Presentations

Conifer forest resilience may be threatened by increasing wildfire activity and compound disturbances in western North America. Fire refugia enhance forest resilience, yet may decline over time due to delayed mortality—a process that remains poorly understood at landscape and regional scales. To address this uncertainty, we used high-resolution satellite imagery (5-m pixel) to map and quantify delayed mortality of conifer tree cover between 1 and 5 years postfire, across 30 large wildfires that burned within three montane ecoregions in the western United States. We used statistical models to explore the influence of burn severity, topography, soils, and climate moisture deficit …

Cognitive And Economic Development, John Luke Gallup

OHSU-PSU School of Public Health Annual Conference

A burgeoning literature finds that early childhood risk factors have large causal effects on individuals' cognitive development, education and earnings, but has not assessed the impact on the economy as a whole.

Cognitive ability is the foundation of human capital and the capacity to learn. The risk factors for poor cognitive development are very high in many countries. Each risk factor also causes child mortality, making child survival a viable proxy for good cognitive development conditions. The cognitive development of current workers happened decades earlier when they were children, providing a predetermined correlate. Controlling for country characteristics, income levels and …

Implementation Of A Realistic Artificial Data Generator For Crash Data Generation, Lauren Hoover, Md. Istiak Jahan, Tanmoy Bhowmik, Sudipta Dey Tirtha, Karthik C. Konduri, John Ivan, Kai Wang, Shanshan Zhao, Joshua Auld, Naveen Eluru

Civil and Environmental Engineering Faculty Publications and Presentations

In this paper, a framework is outlined to generate realistic artificial data (RAD) as a tool for comparing different models developed for safety analysis. The primary focus of transportation safety analysis is on identifying and quantifying the influence of factors contributing to traffic crash occurrence and its consequences. The current framework of comparing model structures using only observed data has limitations. With observed data, it is not possible to know how well the models mimic the true relationship between the dependent and independent variables. Further, real datasets do not allow researchers to evaluate the model performance for different levels of …

The Complexities Of Irrigation Efficiency: Groundwater Data, Agro-Hydrology, And Water Decision-Making In Central Oregon, Rebecca Anderson, Alida Cantor

Geography Faculty Publications and Presentations

Irrigation efficiency projects aim to conserve water for in-stream flow and agricultural use by reducing water losses throughout the system. Piping irrigation canals is a common irrigation efficiency method that results in trade-offs: while it increases efficiency of irrigation water conveyance, it reduces incidental groundwater recharge. This paper focuses on the data and decision-making of canal piping, focusing primarily on understanding the potential impacts of reduced canal leakage on shallow wells. By conducting a spatial analysis of shallow wells in the basin at risk of being impacted by canal piping, and combining this with interviews with water managers in central …

Accommodating Spatio-Temporal Dependency In Airline Demand Modeling, Sudipta Dey Tirtha, Tanmoy Bhowmik, Naveen Eluru

Civil and Environmental Engineering Faculty Publications and Presentations

The objective of the current study is to examine monthly air passenger departures at the airport level considering spatial interactions between airports. In this study, we develop a novel spatial grouped generalized ordered probit (SGGOP) model system of monthly air passenger departures at the airport level. Specifically, we estimate two variants of spatial models including spatial lag model and spatial error model. In the presence of repeated demand measures for the airports, we also consider temporal variations of spatial correlation effects among proximally located airports by employing space and time-based weight matrix. The proposed model is estimated using monthly air …

Does El Niño Affect Mjo-Ar Connections Over The North Pacific And Associated North American Precipitation?, Laís G. Fernandes, Paul Loikith

Geography Faculty Publications and Presentations

This study investigates how the El Niño phase (EN) of the El Niño-Southern Oscillation (ENSO) influences the Madden-Julian Oscillation (MJO) modulation of cool-season North Pacific atmospheric rivers (ARs) and associated AR-landfall North American precipitation between 1980 and 2020. EN changes the key drivers of MJO-AR connections by shifting MJO-driven convection east of 180° in MJO phases 6–8 and extending the northern Pacific subtropical jet eastward. Under these conditions, the MJO tropical-extratropical teleconnection is triggered east of 180° in phases 7–8, and a persistent cyclonic flow anomaly develops along the United States west coast. Anomalous northeastward integrated water vapor transport (IVT) …

Faculty Senate Monthly Packet April 2024, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The April 1, 2024 monthly packet includes the April agenda, appendices, and the Faculty Senate minutes and attachments from the meeting held April 1, 2024.

Language Representation Diversity In Independently Translated Literature, Cecilia Too

Book Publishing Final Research Papers

The purpose of this survey is to determine the diversity of language representation in translated literature. Specifically, this study will examine three independent presses and one imprint that publishes literary works, both fiction and nonfiction. This paper surveys the languages represented in the translated works published by these presses over the course of five years, from 2018 to 2022. A case study of one independent press, Other Press, is conducted to further study the genre and country representation in translated literature. This study finds that European languages, particularly Western European languages, are overrepresented in translated literature by more than a …

Floodplain Restoration And Its Effects On Summer Water Temperature And Macroinvertebrates In Whychus Creek, Oregon (Usa), Wesley N. Noone, Patrick M. Edwards, Yangdong Pan, Colin R. Thorne

Environmental Science and Management Faculty Publications and Presentations

Stream restoration is a proposed climate adaptation tool; however, outcomes of floodplain restoration on stream temperature have been debated. Despite a growing number of studies that investigated water temperature in restored streams, few have quantified temperature variations in new habitat types created by restored hydrogeomorphic processes to explore the effects on aquatic macroinvertebrates. We evaluated the hypotheses: (1) restoration increases habitat diversity, (2) habitat diversity increases water temperature variability, and (3) restoration increases the diversity of macroinvertebrate assemblage and temperature associations. In August 2021, we collected environmental data to describe the aquatic habitats, water temperature and quality (continuous and discrete), …

Beavers Beyond Boundaries: Perceptions Of Beaver-Related Restoration, Matthew V. Guziejka

Urban Ecosystem Research Consortium of Portland/Vancouver

This urban-focused research explores the multifaceted aspects of Beaver-Related Restoration (BRR) within the Tualatin River watershed, using a hydrosociological framework to understand the interconnectedness of water, ecological systems, and societal perceptions. Analyzing social and cultural dimensions associated with BRR, including stakeholder attitudes and potential conflicts, we conducted a voluntary survey at three Tualatin urban watershed study sites (Fanno Creek, Chicken Creek, Springville) during the summer of 2022.

Insights from residents' attitudes, perceived impacts, and preferred management strategies revealed a spectrum of opinions. While a majority acknowledged positive beaver impacts on water quality and habitat diversity, some expressed concerns about urban …

Edna Study Of The Kellogg-Mt. Scott Watershed, Amy D. Van Riessen

Urban Ecosystem Research Consortium of Portland/Vancouver

The Kellogg Creek Restoration and Community Enhancement Project is an exciting effort occurring in the heart of downtown Milwaukie. The project encompasses many elements, including:

• providing fish passage to 15 miles of habitat by removing the barrier at Kellogg Dam
• restoring 17 acres of high-quality habitat behind the dam
• providing public access and viewing points to encourage nature-based recreation and outdoor education
• increasing flood storage capacity to reduce flooding in lower Kellogg Creek
• modernizing the existing Oregon State Highway 99E bridge with an alternative that increases seismic resiliency and establishes a safe bike/pedestrian undercrossing
• providing interactive learning, scientific research and …

Reconnecting A Stream Channel To Its Floodplain: Implications For Benthic Diatoms And Macroinvertebrate Trophic Structure, Patrick M. Edwards, Nicole C. Popp, Yangdong Pan, Christine L. Weilhoefer, Aspen Peterman, Lauren Mork, Matthew F. Johnson, Megan Colley, Multiple Additional Authors

Environmental Science and Management Faculty Publications and Presentations

Streams systems draining upland landscapes provide valuable ecosystem services, but they are vulnerable to incision and channelization caused by anthropogenic disturbance. Restoring a degraded stream to its pre-disturbance condition by reconnecting the channel to its historical floodplain aims to recover lost hydro-morphological processes and functions. Seeking evidence to indicate whether that aim is met in practice, we examined diatoms and the stream macroinvertebrate trophic structures in three reaches of Whychus Creek, Oregon, United States. Two reaches were reconnected to their pre-disturbance floodplains in 2012 and 2016. The third, control reach, was not restored and was selected to represent the degraded …

Drivers Of Tree Canopy Loss In A Mid-Sized Growing City: Case Study In Portland, Or (Usa), Yunjae Ock, Vivek Shandas, Fernanda Ribeiro, Noah Young

Geography Faculty Publications and Presentations

The benefits of the urban tree and tree canopy (UTC) are increasingly crucial in addressing urban sustainability. Yet, increasingly evident from earlier research is the distributional inequities of UTC and active efforts to expand tree plantings. Less is known about the dynamics of UTC loss over time and location. This study aims to understand the dynamics of UTC change, especially canopy loss, and to investigate the drivers of the loss. This study draws on a high–resolution dataset of an urban canopy in Portland, Oregon, USA, assessing changes in UTC from 2014 to 2020. By integrating demographic, biophysical, and policy data …

An Evaluation Of The Federal Transition Incentives Program On Land Access For Next-Generation Farmers, Megan Horst, Julia Valliant, Julia Freedgood

Urban Studies and Planning Faculty Publications and Presentations

Next-generation farmers face immense challenges in securing land. In recent years, some state- and federal-level land access policy incentives (LAPIs) have been implemented to address these chal­lenges. In this paper, we assess the Transition Incentives Program (TIP), an initiative of the U.S. Department of Agriculture’s Conservation Reserve Program that is funded by Congressional farm bills. TIP offers landowners two years of financial incen­tives for leasing or selling to a beginning or socially disadvantaged farmer or rancher (categories of farmers defined by the U.S. Department of Agri­culture). In our study, we characterize TIP partici­pants to understand where and how TIP assists …

The Arab Spring Uprisings In Geopolitical Context, Jake Alan Rutledge

Dissertations and Theses

The question of why revolts, civil wars, and social unrest occur is central in the field of political science. This paper asks that question in the specific context of the 2011 Arab Spring uprisings as a revolutionary wave. Many theories of revolution and social unrest locate their causes in the internal characteristics of the country where they take place, such as the country's demographics or level of economic development. This paper examines the external situation of a country: its relationships with other states and the international community. This paper examines eighteen Arab countries in the Middle East and North Africa …

Active Transportation Counts From Existing On-Street Signal And Detection Infrastructure, Sirisha Kothuri, Patrick Allen Singleton, Mahyar Vahedi Saheli, Elizabeth Yates, Joseph P. Broach

Civil and Environmental Engineering Faculty Publications and Presentations

This study’s objective was to use data from existing traffic signal infrastructure to estimate pedestrian volumes. Pedestrian push-button actuations were collected from signal controller logs at 49 intersections in western Oregon and an additional 16 intersections in eastern Oregon. These actuations were then compared to observed pedestrian counts, totaling over 34,000 people, obtained from video recordings. After exploring various options, a simple quadratic relationship was modeled using a single measure of pedestrian signal activity: the number of push-button presses (filtered to remove multiple presses within 15 seconds). The model’s predictions showed a correlation of 0.86 with observed pedestrian volumes and …

The Meteorology And Impacts Of The September 2020 Western United States Extreme Weather Event, Emma N. Russell, Paul Loikith, Idowu Ajibade, James Done, Chris Lower

Geography Faculty Publications and Presentations

In September 2020, Western North America was impacted by a highly anomalous meteorological event. Over the Pacific Northwest, strong and dry easterly winds exceeded historically observed values for the time of year and contributed to the rapid spread of several large wildfires. Nine lives were lost and over 5000 homes and businesses were destroyed in Oregon. The smoke from the fires enveloped the region for nearly two weeks after the event. Concurrently, the same weather system brought record-breaking cold, dramatic 24-h temperature falls, and early-season snowfall to parts of the Rocky Mountains. Here we use synoptic analysis and air parcel …

The Pacific Sentinel, February 2024, Portland State University. Student Publications Board

The Pacific Sentinel

Editor: Eva Sheehan

Articles in this issue include:

• Earth Mama
• Spotlighting Black Artists Through a Mix of Mediums
• The Dresden Dolls in Portland: A Punk Cabaret
• Let Knowledge Serve the City
• Artificial Intelligence
• Surviving Seasonal Struggles
• What We're Enjoying
• Events Calendar & Extras

Inclusive Approaches For Measuring Demographics Of Underrepresented Populations In Stem And Biomedical Research Training Programs, Stephanie E. Paris, Alexis Dinno, Mollie C. Marr, Aaron Raz Link, Brandy L. Lentz, Gwen Shusterman, Jerian Abel, Kristen Harrison, James Hook, Dawn M. Richardson, Multiple Additional Authors

OHSU-PSU School of Public Health Faculty Publications and Presentations

As federal strategic plans prioritize increasing diversity within the biomedical workforce, and STEM training and outreach programs seek to recruit and retain students from historically underrepresented populations, there is a need for interrogation of traditional demographic descriptors and careful consideration of best practices for obtaining demographic data. To accelerate this work, equity-focused researchers and leaders from STEM programs convened to examine approaches for measuring demographic variables. Gender, race/ethnicity, disability, and disadvantaged background were prioritized given their focus by federal funding agencies. Categories of sex minority, sexual (orientation) minority, and gender minority (SSGM) should be included in demographic measures collected by …

2020 Racial Justice Protests In Portland, Or: An Analysis Of Radical Place-Making And Police Tactics In A Neighborhood Context, Claire Brumbaugh-Smith

Dissertations and Theses

During the George Floyd protests, police used tactics infrequently seen until now, including the use of tear gas and sonic weapons in contested spaces. Police tactics are presumably sanctioned by policing directives, but little is known about how these tactics may vary across space at a granular spatial level, or how they might be normalized over time. To address this knowledge gap, I used the concept of repertoires of protest control to characterize and quantify the tactics of the Portland Police Bureau (PPB) deployed on racial justice protesters during the 2020 racial justice protests and describe the role of these …

Microsoft Access To Sqlite Database Migration For Existing Forest Management Software: Methods And Considerations, Drue Kathryn Lindstrom

Masters in GIS Practicum Reports

Bioregional Inventory Originated Simulation Under Management (BioSum) is software from the US Forest Service’s Forest Inventory and Analysis (FIA) program. It is a complex analysis framework that models and evaluates forest management treatments across multi-decade timeframes. Originally written to work with Microsoft Access databases, BioSum is migrating to the use of SQLite as its database engine. The final module of BioSum, Treatment Optimizer, is the first one to be converted so the changes can be implemented incrementally. This practicum report outlines a workflow for converting the database engine of an existing program from Microsoft Access to SQLite with the example …

Reflections On The First 50 Years Of Oregon's Pioneering Statewide Land Use Planning, 1973-2023, Arthur C. Nelson

People and the Land: An Oral History of Oregon’s Statewide Land Use Planning Program

Arthur C. Nelson, emeritus professor of urban planning and real estate development at the University of Arizona, presents an assessment of the impact of Senate Bill 100 on land use in Oregon over the past fifty years, and of the challenges ahead to 2050 and beyond.

2023 Oregon Statewide Homelessness Estimates, Jacen Greene, Franklin H. Spurbeck, Marisa Zapata

Homelessness Research & Action Collaborative Publications and Presentations

Executive Summary excerpt:

The Point-In-Time (PIT) count is a census of people experiencing both sheltered and unsheltered homelessness on a single night in January. The federal government requires this as a condition of funding it distributes to Continuums of Care (CoCs), networks of government agencies and service providers that manage homelessness services and funding in specific regions. Oregon has eight CoCs, five of which manage their own PIT count, which leads to variation in methodology and completeness. The PIT count’s accuracy is further reduced because it only captures homelessness on a single night, missing changes throughout the year, and uses …

The Intersection Of Asset Management And Geographic Information Systems For University Facilities Maintenance, Andrew Westerlund Beland

Masters in GIS Practicum Reports

This project describes a proof of concept for developing a digital asset management system dashboard for water backflow assemblies at Portland State University (PSU) using a modified ESRI ArcGIS Online backflow solution. Asset management is crucial for optimizing the lifecycle of tangible assets, which ensures cost-effective operational efficiency and regulatory compliance. PSU manages over 250 backflow assemblies spread across the 50-acre campus and has traditionally relied on manual processes, which can lead to inefficiencies and potential transcription errors.

The system links spatial data with asset attributes for backflow devices, enabling field staff to update inspection results directly from mobile devices. …

A Genus In The Bacterial Phylum Aquificota Appears To Be Endemic To Aotearoa-New Zealand, Jean F. Power, Carlo R. Carere, Holly E. Welford, Daniel T. Hudson, Kevin C. Lee, John W. Moreau, Anna-Louise Reysenbach, Thijs J.G. Ettema, Multiple Additional Authors

Biology Faculty Publications and Presentations

Allopatric speciation has been difficult to examine among microorganisms, with prior reports of endemism restricted to sub-genus level taxa. Previous microbial community analysis via 16S rRNA gene sequencing of 925 geothermal springs from the Taupō Volcanic Zone (TVZ), Aotearoa-New Zealand, revealed widespread distribution and abundance of a single bacterial genus across 686 of these ecosystems (pH 1.2-9.6 and 17.4-99.8 °C). Here, we present evidence to suggest that this genus, Venenivibrio (phylum Aquificota), is endemic to Aotearoa-New Zealand. A specific environmental niche that increases habitat isolation was identified, with maximal read abundance of Venenivibrio occurring at pH 4-6, 50-70 °C, and …

Urban Streetscape Changes In Portland, Oregon: A Longitudinal Virtual Audit, Tomoya Hanibuchi, David Banis, Hunter Shobe, Tomoki Nakaya, Shohei Nagata

Geography Faculty Publications and Presentations

Streetscape imagery has considerable potential for observing urban change. The literature lacks sufficient longitudinal studies, however, on urban change considering human perception and activities. We conducted a longitudinal virtual audit to observe the change in urban liveliness, human activities, and built environment by examining streetscape imagery taken in the late 2000s and the late 2010s in Portland, Oregon. Eleven untrained crowd workers were recruited to provide liveliness ratings of 24,242 streetscape images for both periods. Tabulation, mapping, and multilevel regression analyses were conducted to observe the distribution, changes in liveliness, and the factors affecting these changes. The results confirmed that …

Scales Of Connectivity Within Stream Temperature Networks Of The Clackamas River Basin, Oregon, Michael Krochta, Heejun Chang

Geography Faculty Publications and Presentations

Water quality varies along the stream network; thus, considering the directional, dendritic nature of stream networks with surrounding landscape variables is essential in explaining spatial variations of water quality. Using a spatially extensive stream temperature monitoring effort in the Clackamas River Basin in the United States, we first compare spatial scales of analysis of atmospheric, landscape, and in-stream explanatory variables through their correlation with summer stream temperatures. We then derive a predictive stream temperature model with factors representing the spatial variation of local climate, recent wildfire effects, and discharge. Finally, we compare nonspatial multiple linear regression to a spatial stream …

Suitability Analysis Of Public And Institutional Lands For The Oregon Farm To Institution Collaborative, Megan Horst, Maura Paxton

Urban Studies and Planning Faculty Publications and Presentations

This report provides a statewide view of public and institutional lands that may be suitable for farm to institution food production in Oregon. The goal is to assist the Oregon Farm to Institution Collaboration, and particularly the Land Access and Shared Assets Work Group, in identifying possible lands for farmers and food producers to grow food for schools, hospitals, and other institutions.

We start by comparing Oregon to other states, in terms of their public land access efforts around farm to institution or other related agriculture. We also showcase some interesting cases which may serve as inspiration to Oregonians. The …