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!
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The world's highest gain high power laser amplifier - by many orders of magnitude - has been developed in research led at the University of Strathclyde.
The researchers demonstrated the feasibility of using plasma to amplify short laser pulses of picojoule-level energy up to 100 millijoules, which is a 'gain'...
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
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