Analyses of Terrestrial and Martian Barchan Morphometry

Authors: Robert Butler*, University of Alabama, Douglas J Sherman, Graduate Adviser
Topics: Geomorphology, Arid Regions, Physical Geography
Keywords: Sand Dune, Mars, Barchan, GIS, Morphometry
Session Type: Poster
Day: 4/12/2018
Start / End Time: 1:20 PM / 3:00 PM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

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 other dune fields. This study includes diverse dune fields on both Earth and Mars, and concentrates 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 and Google Earth’s and Digital Globe’s free, high-resolution imagery. The key dimensions of more than 2000 barchans, representing dunes from 20 terrestrial and 7 Martian dune fields, were measured using the Google Earth ruler tool and Photoshop CC software. Dune field statistics were quantified using Microsoft Excel, ArcGIS, and IBM SPSS Software. Determining the variability 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, and geospatial distributions of barchan populations, and may provide a robust basis for the classification of barchan morphologies according to dimensionless geometry.

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