Controls on Eolian Landscape Evolution in Fractured Bedrock

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dc.contributor.authorPerkins, Jonathan P.en
dc.contributor.authorFinnegan, Noah J.en
dc.contributor.authorde Silva, Shanaka L.en
dc.contributor.authorWillis, Michael J.en
dc.date.accessioned2024-02-21T18:02:34Zen
dc.date.available2024-02-21T18:02:34Zen
dc.date.issued2019-11-08en
dc.description.abstractWind abrasion is important for planetary landscape evolution, and wind-abraded bedrock landscapes contain many landforms that are difficult to interpret. Here we exploit a natural experiment in Chile where topographic shielding by an upwind lava flow yields diverse erosional landforms in a downwind ignimbrite. Using a 3-D topographic wind model, we find that low velocities in the wake of a lava lobe coincide with a transition from landforms reflecting fracture-parallel erosion to flow-parallel erosion. Erosion rates across these landforms vary with shear velocity and abrasion susceptibility of the windward escarpment. We hypothesize that this morphologic threshold is controlled by whether particles can be lofted in suspension and overcome topographic steering imposed by fractured bedrock blocks. Within a phase space set by Rouse and Stokes numbers, our data illustrate that wind-abraded landforms reflect a competition between the material skeleton of the landscape and the strength of the flow that shapes it.en
dc.description.versionPublished versionen
dc.format.extentPages 12012-12020en
dc.format.extent9 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2019GL083955en
dc.identifier.eissn1944-8007en
dc.identifier.issn0094-8276en
dc.identifier.issue21en
dc.identifier.urihttps://hdl.handle.net/10919/118090en
dc.identifier.volume46en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectwind erosionen
dc.subjectplanetary landscape evolutionen
dc.subjectgeomorphologyen
dc.subjectAtacamaen
dc.titleControls on Eolian Landscape Evolution in Fractured Bedrocken
dc.title.serialGeophysical Research Lettersen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
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pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
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pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen

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