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'Thermal pollution' in rivers not fully mediated by gravel augmentation
Date:6/8/2011

eratures down, but not necessarily change the river's overall mean temperature. To explore their hypothesis, they mapped the locations of gravel bars along a 15-mile stretch of the river and documented the temperature of water cycling into and out of each of them.

They found 52 temperature differences within the stretch of the Clackamas, with temperatures at these locations from 1 to 4 degrees cooler than the main channel. The researchers were then able to link the cooler areas with specific gravel bar features and with specific times and locations within the Clackamas to create models that depicted the subsurface flow patternsultimately revealing that a very small percentage of the river's water actually passed through the gravel bars, making any overall effect on the mean temperature minute.

"Results showed a hundredth of a degree of temperature change through a single bar," said Grant. "Not much."

This finding suggests that gravel augmentation alone is not likely to have a significant temperature-mediating effect in large rivers. However, the work demonstrated that gravel augmentation may provide local habitat benefits to fish and small invertebrates by creating cool areas within rivers where they can seek refuge during hot weather.


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Contact: Yasmeen Sands
ysands@fs.fed.us
360-753-7716
USDA Forest Service, Pacific Northwest Research Station
Source:Eurekalert

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