Dune mobility in the St. Anthony Dune Field, Idaho, USA: Effects of meteorological variables and lag time
| Autor: | David R. Gaylord, R.H. Hoover, Catherine M. Cooper |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Aerial photos 010502 geochemistry & geophysics 01 natural sciences Field (geography) Wind speed Sand dune stabilization Lag time Barchan Aeolian processes Precipitation Physical geography Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Geomorphology. 309:29-37 |
| ISSN: | 0169-555X |
| DOI: | 10.1016/j.geomorph.2018.02.018 |
| Popis: | The St. Anthony Dune Field (SADF) is a ~300 km2 expanse of active to stabilized transverse, barchan, barchanoid, and parabolic sand dunes located in a semi-arid climate in southeastern Idaho. The northeastern portion of the SADF, ~16 km2, was investigated to examine meteorological influences on dune mobility. Understanding meteorological predictors of sand-dune migration for the SADF informs landscape evolution and impacts assessment of eolian activity on sensitive agricultural lands in the western United States, with implications for semi-arid environments globally. Archival aerial photos from 1954 to 2011 were used to calculate dune migration rates which were subsequently compared to regional meteorological data, including temperature, precipitation and wind speed. Observational analyses based on aerial photo imagery and meteorological data indicate that dune migration is influenced by weather for up to 5–10 years and therefore decadal weather patterns should be taken into account when using dune migration rates as proxies from climate fluctuation. Statistical examination of meteorological variables in this study indicates that 24% of the variation of sand dune migration rates is attributed to temperature, precipitation and wind speed, which is increased to 45% when incorporating lag time. |
| Databáze: | OpenAIRE |
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