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GSA Bulletin: From Titan to Tibet
Date:11/27/2012

many threatened fish species. Searching for a way to better identify habitat suitable for restoration projects, researchers from Boston College and Indiana University found a way to reliably predict grain size based on channel properties measured from digital topographic data. Using high-resolution laser topographic surveys of three Maine river systems, the team found that the three predictive models tested were 70%-80% accurate, with the best results in rivers with coarse gravel beds. The authors explore how glacial and land-use history influences channel processes in the rivers, and its impact on model success or failure. The team found its methods most successful in areas downstream of lakes where sediment spills into the channels mostly from the adjacent riverbanks and hillsides. The models were less successful in places where larger amounts of sediment are supplied from an upstream network of creeks and tributaries. By giving researchers a new tool to identify rivers and streams most suitable for desired species of fish, the models tested by the team offer researchers a new method to prioritize fish habitat restoration projects.


Owyhee River intracanyon lava flows: Does the river give a dam?
Lisa L. Ely et al., Dept. of Geological Sciences, Central Washington University, 400 E. University Way Ellensburg, WA 98926, USA. Posted online 2 Oct. 2012; http://dx.doi.org/10.1130/B30574.1.

Rivers in bedrock canyons are occasionally dammed by lava flows or large mass movements, which can dominate the river behavior and landscape for many kilometers. Lisa L. Ely and colleagues use examples from the Owyhee River in southeastern Oregon to document the effects of lava dams on rivers at a variety of spatial and temporal scales. Lava flows have flowed over the rim of the Owyhee Canyon and dammed the river six times in the last two million years, most recently only 70,00
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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