Grainflows (or avalanches) are fundamental mechanisms associated with the evolution and migration of dunes. This study addresses grainflow morphology on the 21.3 m and 54.5 m high slipfaces of two barchans. A series of metrics to characterize shape developed with the perspective that this approach may provide a key to recognizing different grainflow morphodynamic regimes. We provide the first detailed and objective measurements of grainflow morphometry based on terrestrial laser scanning and subsequent image analysis of 1243 grainflows on the larger dune and 1609 from the smaller dune. Grainflow shape was classified based on five representative morphometric attributes: average length, average width, rectangularity, triangularity, and elongation. Cluster analysis indicated three recognizable grainflow types: elongated, narrow grainflows (Type 1); long, triangular grainflows (Type 2); and short, rectangular grainflows (Type 3). The distributions of grainflow types were substantially different on the larger and smaller dune, and different from distributions found on smaller dunes in other studies.
|Original language||English (US)|
|Number of pages||12|
|Journal||Earth Surface Processes and Landforms|
|State||Published - Jun 15 2022|
- aeolian geomorphology
- dune migration
- dune slipface
ASJC Scopus subject areas
- Geography, Planning and Development
- Earth-Surface Processes
- Earth and Planetary Sciences (miscellaneous)
FingerprintDive into the research topics of 'Quantification and classification of grainflow morphology on natural dunes'. Together they form a unique fingerprint.
Data for Quantification and classification of grainflow morphology on natural dunes
Zhang, P. (Contributor), Sherman, D. J. (Contributor), Pelletier, J. D. (Contributor), Ellis, J. T. (Contributor), Farrell, E. J. (Contributor) & Li, B. (Contributor), ZENODO, 2022
DOI: 10.1002/esp.5348, https://zenodo.org/record/6131939