Details:

Journal Title:
Geophysical Research Letters
Personal Author:
Perkins, Jonathan P. ; Finnegan, Noah J. ; de Silva, Shanaka L. ; Willis, Michael J.
Perkins, Jonathan P. ; Finnegan, Noah J. ; de Silva, Shanaka L. ; Willis, Michael J. Less -
NOAA Program & Office:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
Wind 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.
Keywords:
[+]
Wind

Source:
Geophysical Research Letters, 46, 12012-12020.
DOI:
https://doi.org/10.1029/2019GL083955
Document Type:
Journal Article
Rights Information:
Other
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Submitted
Main Document Checksum:
[+]
urn:sha256:9897f9b331bb3937e0e6112ee9406650b7efb2e0a8629528c328a9eeb8a709a8
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