Researchers measure effects of flow regulation and diking on salmon habitat loss

orbital mechanics of the earth, sun and moon) affecting the tides. While we know of one other computer system that can do this, ours is more compact, closer to the actual physics of the problem, and works better when river flow changes rapidly, as it sometimes does in the Columbia, as opposed to seasonally."

Kukulka and Jay's work is part of a broader, multi-institutional effort to understand the Columbia River ecosystem. In that effort, another OGI research team is using detailed numerical computer models and an extensive real-time observation network to understand and predict circulation and physical habitat in the lower Columbia, including such factors as water level, velocity, salinity and water temperature (see www.ccalmr.ogi.edu/CORIE).

"Our work nicely complements Tobias and David's research. While we are providing spatial and temporal detail over weeks, months or a few years for a range of parameters, the Kukulka-Jay work is providing an important longer-term perspective at lesser detail and more focus on water levels," said Antonio Baptista, Ph.D., professor and head of environmental and biomolecular systems in the OGI School of Science & Engineering.

The OGI School of Science & Engineering (formerly the Oregon Graduate Institute of Science & Technology) became one of four schools of Oregon Health & Science University in 2001. For more information on the OGI School of Science & Engineering and the Department of Environmental and Biomolecular Systems, go to www.ebs.ogi.edu.

Contact: Sydney Clevenger
Oregon Health & Science University

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