Show simple item record Hugenholtz, Chris H. Barchyn, Thomas E. 2013-12-04T18:19:47Z 2013-12-04T18:19:47Z 2012-01-26
dc.identifier.citation Hugenholtz, C.H., Barchyn, T.E., 2012. Real barchan dune collisions and ejections. Geophysical Research Letters 39, L02306. en_US
dc.description.abstract From high-resolution satellite imagery of barchan sand dunes, we provide geomorphological evidence of collisions that result in the ejection of a barchan from the wake of another barchan dune. Previous interpretations suggest this outcome is evidence of soliton or solitary wave behaviour; however, the physical mechanisms for mass exchange are not fully understood, resulting in debate. Our evidence and interpretation indicates that mass is transferred to the upwind barchan by shadowing a portion of downwind barchan's stoss slope. Turbulent, unsaturated airflow erodes the surface between the dunes, creating a smaller dune that ejects from the wake region. Previous observations lacked the spatial resolution required to document this process; therefore, our observations clarify the collision dynamics of barchans. A broader implication of our observations is the role of collisions in maintaining an equilibrium size distribution in barchan swarms. en_US
dc.language.iso en_CA en_US
dc.publisher Blackwell Publishing Ltd. en_US
dc.subject Sand dunes--Erosion en_US
dc.subject Climate change en_US
dc.subject Sand dunes--Remote sensing en_US
dc.subject Geomorphology en_US
dc.subject Hydrology en_US
dc.subject Barchan swarms en_US
dc.title Real barchan dune collisions and ejections en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Geography en_US
dc.description.peer-review Yes en_US
dc.publisher.institution University of Lethbridge en_US

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