期刊
ICARUS
卷 203, 期 1, 页码 71-76出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2009.03.033
关键词
Earth; Geological processes; Mars surface
资金
- Great Sand Dunes National Park and Preserve
- National Climatic Data Center
- NASA [NNG04GN88G]
The rate of movement for 3- and 10-cm-high granule ripples was documented in September of 2006 at Great Sand Dunes National Park and Preserve during a particularly strong wind event. Impact creep induced by saltating sand caused 24 granules min(-1) to cross each cm of crest length during wind that averaged similar to 9 m s(-1) (at a height well above 1 m), which is substantially larger than the threshold for saltation of sand. Extension of this documented granule movement rate to Mars suggests that a 25-cm-high granule ripple should require from hundreds to thousands of Earth-years to move I cm under present atmospheric conditions. Published by Elsevier Inc.
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