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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Seasonality Of Nitrogen Balances In A Mediterranean Climate Watershed, Oregon, Us, Jiajia Lin, Jana E. Compton, Scott G. Leibowitz, George Mueller-Warrant, William Matthews, Stephen H. Schoenholtz, Daniel M. Evans, Rob A. Coulombe
Seasonality Of Nitrogen Balances In A Mediterranean Climate Watershed, Oregon, Us, Jiajia Lin, Jana E. Compton, Scott G. Leibowitz, George Mueller-Warrant, William Matthews, Stephen H. Schoenholtz, Daniel M. Evans, Rob A. Coulombe
United States Environmental Protection Agency: Staff Publications
We constructed a seasonal nitrogen (N) budget for the year 2008 in the Calapooia River Watershed (CRW), an agriculturally dominated tributary of the Willamette River (Oregon, U.S.) under Mediterranean climate. Synthetic fertilizer application to agricultural land (dominated by grass seed crops) was the source of 90% of total N input to the CRW. Over 70% of the stream N export occurred during the wet winter, the primary time of fertilization and precipitation, and the lowest export occurred in the dry summer. Averaging across all 58 tributary subwatersheds, 19% of annual N inputs were exported by streams, and 41% by crop …
Land-Use/Land-Cover Changes And Their Influence On The Ecosystem In Chengdu City, China During The Period Of 1992–2018, Xiaojuan Lin, Min Xu, Chunxiang Cao, Ramesh P. Singh, Wei Chen, Hongrun Ju
Land-Use/Land-Cover Changes And Their Influence On The Ecosystem In Chengdu City, China During The Period Of 1992–2018, Xiaojuan Lin, Min Xu, Chunxiang Cao, Ramesh P. Singh, Wei Chen, Hongrun Ju
Mathematics, Physics, and Computer Science Faculty Articles and Research
Due to urban expansion, economic development, and rapid population growth, land use/land cover (LULC) is changing in major cities around the globe. Quantitative analysis of LULC change is important for studying the corresponding impact on the ecosystem service value (ESV) that helps in decision-making and ecosystem conservation. Based on LULC data retrieved from remote-sensing interpretation, we computed the changes of ESV associated with the LULC dynamics using the benefits transfer method and geographic information system (GIS) technologies during the period of 1992–2018 following self-modified coefficients which were corrected by net primary productivity (NPP). This improved approach aimed to establish a …
Spatial Analysis Of Air Particulate Pollution Distributions And Its Relation To Real Property Value In Beijing, China, Yingyu Zhang
Spatial Analysis Of Air Particulate Pollution Distributions And Its Relation To Real Property Value In Beijing, China, Yingyu Zhang
Great Lakes Center Masters Theses
Air particulate pollution contributes the major air pollution in Beijing, China. In this research, concentrations of air particulate pollutants were measured at a total of twenty-three field locations in the urban districts of Beijing applying a laser particle counter in June and December 2015. Geographic Information System (GIS) was utilized to study the two and three-dimensional spatial distributions of air particulate pollution (PM0.5, PM1.0, PM2.5, PM5.0, PM10). Geostatistical or spatial statistical models were applied to interpolate the spatial distributions of air particulate pollution and real property values in the study area. Geographically Weighted Regression (GWR) was applied to analyze the …
A Land Use Regression Model For Explaining Spatial Variation In Air Pollution Levels Using A Wind Sector Based Approach, Owen Naughton, Aoife Donnelly, Paul Nolan, Francesco Pilla, Bruce Misstear, Brian Broderick
A Land Use Regression Model For Explaining Spatial Variation In Air Pollution Levels Using A Wind Sector Based Approach, Owen Naughton, Aoife Donnelly, Paul Nolan, Francesco Pilla, Bruce Misstear, Brian Broderick
Articles
Estimating pollutant concentrations at a local and regional scale is essential for good ambient air quality information in environmental and health policy decision making. Here we present a land use regression (LUR) modelling methodology that exploits the high temporal resolution of fixed-site monitoring (FSM) to produce viable air quality maps. The methodology partitions concentration time series from a national FSM network into wind-dependent sectors or “wedges”. A LUR model is derived using predictor variables calculated within the directional wind sectors, and compared against the long-term average concentrations within each sector. This study demonstrates the value of incorporating the relative position …
Watershed Management Tools: Hazardous Site Case History, Reference Stream Analysis, And Gis Analysis Of Fire Risk, Patrick Doyle
Watershed Management Tools: Hazardous Site Case History, Reference Stream Analysis, And Gis Analysis Of Fire Risk, Patrick Doyle
Graduate Student Portfolios, Professional Papers, and Capstone Projects
My portfolio explores some tools that are used to protect or assess watershed health and the experiences and lessons I learned during my time in the Environmental Studies program. The first piece in my portfolio is a case study that looks at the history of pollution ad cleanup of the kraft pulp mill along the Clark Fork River. In my study, I look closely at the EPA’s investigation of the site and the community’s reaction to the findings. In my second piece, I describe my field and lab experience working for the Montana Department of Environmental Quality. During this time, …