Watersheds

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  1. Emerging Pollutants in the Columbia River: A Simple Assessment of Nonpoint Source Zones

    Water quality modeling in the Columbia River Basin was conducted at the confluence of the Willamette and Columbia Rivers, river mile 101. The study area for this research consists of Sauvie Island, OR, and the...

  2. An Assessment of the Impacts of Climate Change on the Upper Clackamas River Basin with a Distributed Hydrologic Model

    The Pacific Northwest is dependent on seasonal snowmelt for water resources that support a significant portion of its economy. Increased temperatures resulting from higher concentrations of atmospheric...

  3. Statistical Comparisons of Watershed-Scale Response to Climate Change in Selected Basins across the United States

    In an earlier global climate-change study, air temperature and precipitation data for the entire twenty-first century simulated from five general circulation models were used as input to precalibrated watershed...

  4. Environmental Controls on the Landscape-Scale Biogeography of Stream Bacterial Communities

    We determined the biogeographical distributions of stream bacteria and the biogeochemical factors that best explained heterogeneity for 23 locations within the Hubbard Brook watershed, a 3000-ha forested...

  5. State of the River Report for Toxics

    The United States Environmental Protection Agency (EPA) strives to prevent pollution, protect water quality and improve ecosystems in order to reduce risks to human health and the environment. As outlined in...

  6. Temporal Variations of Citizens’ Demands on Flood Damage Mitigation, Streamflow Quantity and Quality in the Korean Urban...

    Sustainable watershed management (SWM) can be achieved through recognition and reflection upon the values of citizens. Collaborative governance consisting of citizens is crucial for successful SWM....

  7. Structuring expert input for a knowledge-based approach to watershed condition assessment for the Northwest Forest Plan, USA

    Assessments of watershed condition for aquatic and riparian species often have to rely on expert opinion because of the complexity of establishing statistical relationships among the many factors involved. Such...

  8. Streamflow Modeling of Johnson Creek Subwatersheds Using the Precipitation Runoff Modeling System

    Johnson Creek, in the Portland, Oregon metropolitan region, has several pollutants on the U.S. Environmental Protection Agency’s (EPA) 303(d) list including excess heat, low dissolved oxygen, and harmful...

  9. The paleolimnology of Bull Run Lake: disruption and stability in a natural system

    Detailed analysis of the physical, chemical, pollen and diatom stratigraphy of sediment cores from Bull Run Lake, Oregon reveals that the lake has been subject to repeated episodes of disruption by volcanic ash...

  10. Biostratigraphy of the Cowlitz Formation in the upper Nehalem River Basin, northwest Oregon

    Examination of stream and roadcut exposures of the Cowlitz Formation allows the selection of measured representative sections, and collection of fossils, from an area roughly defined by the intersection of the...

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