Barchan morphometry: examples from Earth and Mars

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dc.contributor Keellings, David J.
dc.contributor Ellis, Jean T.
dc.contributor.advisor Sherman, Douglas J.
dc.contributor.author Butler, Robert Jack
dc.date.accessioned 2020-03-12T18:06:21Z
dc.date.available 2020-03-12T18:06:21Z
dc.date.issued 2019
dc.identifier.other u0015_0000001_0003494
dc.identifier.other Butler_alatus_0004M_14003
dc.identifier.uri http://ir.ua.edu/handle/123456789/6636
dc.description Electronic Thesis or Dissertation
dc.description.abstract Barchans are a common sand dune type found on both terrestrial and Martian surfaces. The morphometry of individual barchans and barchan groups has been measured extensively in past studies. Within each dune field, similar sized barchans are observed to be abundant, but previous morphometric studies typically do not compare their results with those from many other dune fields. This study includes diverse dune fields on both Earth and Mars concentrating mostly on the dimensionless geometric variabilities of their barchan populations. The geometries show a degree of similarity between barchan populations despite the different environmental characteristics from one dune field to another. This project made use of NASA’s public photos, Mars Reconnaissance Orbiter CTX Imagery, Google Earth, and Digital Globe’s free, high-resolution imagery. The key dimensions of more than 1500 barchans, representing dunes from 14 terrestrial and 5 Martian dune fields, were measured using the Google Earth ruler tool and Photoshop CC software. Determining the variation of barchan geometry provides evidence of similar barchan characteristics on a large scale and creates a foundation for future research. Documenting these barchan geometries provides a better understanding of the geomorphic time-space sequences, evolutions, geospatial distributions of barchan populations, and may provide a robust basis for the classification of barchan morphologies according to dimensionless geometry.
dc.format.extent 59 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Geomorphology
dc.title Barchan morphometry: examples from Earth and Mars
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Department of Geography
etdms.degree.discipline Geography
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.


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