Oregon State University

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Willamette Water 2100 Webinar: Willamette River Basin Hydrodynamic and Temperature Modeling

Scott Wells, Department of Civil and Environmental Engineering, Portland State University

Friday, May 17, 2013 12:00 PM - 1:00 PM

This seminar can be viewed on the OSU campus (Kidder 202) or live online: http://live.oregonstate.edu .  If you join online, please sign in to the chat window with: First Name_Last Name_OrganizationAbbreviation so you can ask questions during and after the seminar and we can track who is watching online.  You will need to use underscores rather than spaces when you sign in and there is a limit of about 30 characters.

This seminar is sponsored by the Willamette Water 2100 Project, a project evaluating how climate change, population growth, and economic growth will change the availability and the use of water in the Willamette River Basin (WRB) on a decadal to centennial timescale. 

 

Abstract:

A study by Oregon DEQ and the Corps of Engineers led to the development of a dynamic hydrodynamic and water quality model of the entire Willamette River basin in Oregon. This model development, in the first phase, was used to set a temperature TMDL for the Willamette system. The Corps of Engineers dynamic 2-D model CE-QUAL-W2 Version 3.1 was applied to the Willamette River basin. The study area, as shown in Figure 1, includes about 600 miles of river. The model domain includes the mainstem Willamette River, the North and South Santiam Rivers (performed by USGS and DEQ), the Long Tom River, the McKenzie River and the Coast and Middle Forks of the Willamette River. The model domain also includes about 70 miles of the Columbia River since it affects the tidally influenced part of the lower Willamette basin.

The study included constructing the model grid and developing dynamic boundary conditions for the system model. The model calibration included model-data comparisons of flow rates at gaging stations, dye study travel times performed throughout the basin, water levels at gaging stations, and continuous temperature data at dozens of locations.

The model was then used to evaluate the temperature impacts of stream shading, different flow management practices from storage reservoirs in the headwaters of the Willamette, and the impact of point source discharges (primarily wastewater treatment plants, pulp and paper mills, and various industries). How these tools will be used in the Willamette 2100 project will be discussed. The model changes include around upgrading the models, simplifying the grids, and using steady-state river hydraulics.

In addition the Corps of Engineers and the USGS have developed some reservoir models for the basin. The development of these models and how they will be used in the Willamette 2100 project will be discussed. Comparisons will be shown of the original models and the simplified models and how these reduce critical computational time for the Envision framework.

 

 


Kidder Hall (campus map)
202
Maria Wright
1 541 737 6148
maria.wright at oregonstate.edu
Water/Watershed Institut
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