The number of large and small dams being removed from U.S. rivers is few, but increasing, as both river restoration gains popularity and aging dams lose their license from the Federal Energy Regulatory Commission. But with these removals come ecological and geological unknowns.
Geotimes follows the story of Marmot Dam in northwestern Oregon to learn more about what happens when a human-made structure is removed from a river after 94 years. Water flow, sedimentation fluctuations and ecological changes could occur but little is known about the natural processes involved when such a large structure is removed after a long period of time. By using the Marmot Dam as a case study, future dams can be removed more easily and efficiently.
Read learn more about changing landscapes, including what America’s developed coastlines can expect as the climate changes and how salinity is a growing problem in many of the world’s agricultural areas, plus read about dangerous contaminants in China’s water and follow the Appalachian Trail into Canada, in the March issue of Geotimes magazine, available February 29 on newsstands and on the Web at http://www.geotimes.org.
Keep up to date with the latest happenings in earth, energy and environment news by checking out Geotimes online at http://www.geotimes.org. Published by the American Geological Institute, Geotimes is your source for news and perspectives on research, technology and policy that affects you everyday. Sign up for E-alerts, our short, weekly e-mails that alert subscribers to new content posted on the Geotimes Web site, and subscribe to the magazine at http://www.geotimes.org.
Megan Sever | EurekAlert!
NASA looks to solar eclipse to help understand Earth's energy system
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Scientists shed light on carbon's descent into the deep Earth
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Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
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