Posted on January 18, 2014 by Bob Berwyn
Small changes from norm can have big impacts
New research to help inform river management.
By Summit Voice
FRISCO — An in-depth U.S. Geological Survey study in the Tennessee River basin may help quantify how streamflow alteration changes aquatic ecosystems.
The research is based on community data collected by the Tennessee Valley Authority, and predictions of streamflow characteristics at more than 600 locations — and the findings indicate that even small deviations from natural streamflows can reduce fish diversity.
The study highlights the importance of the timing, magnitude, and variability of low streamflows and the frequency and magnitude of high streamflows as key characteristics critical to assessing how fish communities change in response to streamflow alteration. Continue reading
Filed under: Environment, rivers, water, water quality | Tagged: aquatic habitat, biodiversity, Environment, rivers, Streamflow, Tennessee River | Leave a comment »
Posted on June 4, 2012 by Bob Berwyn
The Browns Ferry nuclear power plant in Alabama had to shut down several times last summer because the Tennessee River’s water was too warm to be used for cooling.
More partial and total shutdowns of older coal and nuclear power plants predicted as air, river temps get warmer
By Summit Voice
SUMMIT COUNTY — Lack of adequate cooling water supplies have already resulted in reduced production and even temporary shutdowns of several thermoelectric power plants, and global warming could exacerbate those problems, potentially cutting production by up to 19 percent in some places.
Just last summer, the the Browns Ferry Nuclear Plant in Alabama had to shut down more than once because the Tennessee River’s water was too warm to use it for cooling.
That problem will become more common, according to a group of researchers from the University of Washington and Europe, who projected impacts for the next 50 years. According to the study, the likelihood of extreme drops in power generation — complete or almost-total shutdowns — is projected to almost triple. Continue reading
Filed under: climate and weather, energy, Environment, global warming | Tagged: Browns Ferry Nuclear Power Plant, climate change, global warming, power production, Tennessee River, thermoelectric power, University of Washington, Wageningen University and Research Centre | 2 Comments »