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The Geological Society of America Journal Geology: Dynamic geoscience
Date:2/12/2013

stimate wind directions within the dune field through analysis of dune and ripple morphologies and atmospheric modeling and measured a ripple migration rate of 0.66 m/Earth year and dune migration rate of 0.4 m/Earth year in the southwest dune field sector. Ripple and dune morphologies indicate a bidirectional wind regime with winds mainly coming from the ENE and from the NW. These findings show that the MSL landing site is an active environment with the action of the wind being the major agent of landscape modification in the current atmospheric setting. Their constraints on the wind regime provide the unique opportunity to use ground measurements from MSL to test the accuracy of winds predicted from orbital data and make the first ground observations of a known active environment on Mars.


Controls on valley width in mountainous landscapes: The role of landsliding and implications for salmonid habitat C. May et al., Dept. of Biology, James Madison University, Harrisonburg, Virginia 22807, USA. Posted online 7 Feb. 2013; http://dx.doi.org/10.1130/G33979.1.

Most of the highly productive habitat for salmon occurs in low gradient streams with broad valleys, yet there is limited understanding of what controls the width of valleys in mountainous landscapes. C. May and colleagues used high-resolution topographic data in the Oregon Coast Range to explore controls on valley width and couple these findings with models of salmon habitat potential. The first step in this inquiry was to determine how valley floor width varies with drainage area in a catchment that exhibits relatively uniform ridge-and-valley topography sculpted primarily by shallow landslides and debris flows. In this steep and highly dissected terrain, valleys get systematically wider as one moves downstream according to a simple mathematical equation. This drainage area-valley width relation was our baseline for co
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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