Articles | Volume 27, issue 14
https://doi.org/10.5194/hess-27-2807-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-27-2807-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Jul 2023
Research article |
| 28 Jul 2023
| 28 Jul 2023
Warming of the Willamette River, 1850–present: the effects of climate change and river system alterations
Civil and Environmental Engineering, California Polytechnic State University, San Luis Obispo, California, USA
David A. Jay
Civil and Environmental Engineering, Portland State University, Portland, Oregon, USA
Heida L. Diefenderfer
Coastal Sciences Division, Pacific Northwest National Laboratory, Sequim, Washington, USA
School of Environmental and Forest Sciences, University of Washington, Seattle, Washington, USA
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Short summary
Archival measurements and a statistical model show that average water temperature in a major US West Coast river has increased by 1.8 °C since 1850, at a rate of 1.1 °C per century. The largest factor driving modeled changes are warming air temperatures (nearly 75 %). The remainder is primarily caused by depth increases and other modifications to the river system. Near-freezing conditions, common historically, no longer occur, and the number of warm water days has significantly increased.
Archival measurements and a statistical model show that average water temperature in a major US...
