| DOI: | 10.1002/2013GL058665
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| 论文题名: | Mechanisms limiting the growth of aeolian megaripples |
| 作者: | Katra I.; Yizhaq H.; Kok J.F.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10397
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| EISSN: | 1944-10128
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| 出版年: | 2014
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| 卷: | 41, 期:3 | | 起始页码: | 858
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| 结束页码: | 865
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| 语种: | 英语
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| 英文关键词: | fluid threshold
; impact threshold
; megaripples
; saltation
; wind tunnel
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| Scopus关键词: | Wind
; Wind tunnels
; Aeolian megaripples
; Grain size distribution
; impact threshold
; Megaripples
; Morphology control
; saltation
; Sediment distribution
; Wind tunnel experiment
; Grain size and shape
; deflation
; eolian process
; experimental study
; growth response
; particle size
; particulate matter
; saltation
; sediment analysis
; threshold
; wind tunnel
; wind velocity
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| 英文摘要: | Megaripples are distinguished from regular ripples by their larger size and bimodal sediment distribution. The interplay between wind, grain size, and morphology controls their development, but the exact mechanisms that limit the size of megaripples have been unclear. Using wind tunnel experiments, we found two main mechanisms that limit the height of megaripples. The first mechanism is megaripple flattening due to strong enough winds that drive the coarse grains into saltation; the second mechanism is megaripple deflation by impacts of faster saltation grains. In this latter mechanism, the coarse grains are propelled by the impacts of fine saltating grains. The occurrence of both these mechanisms depends on the grain size distribution and increases with both megaripple height and wind speed. Thus, for a given wind environment and grain size distribution, there exists a limit on the size of megaripples, which is determined by these two mechanisms. Key Points Two mechanisms which limit the size of megaripples Both mechanisms depend on grain size, megaripple height and wind speed. For a given wind and grain size, there exists a limit on megaripples size. ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893174823&doi=10.1002%2f2013GL058665&partnerID=40&md5=0be9763b0bca8a60c26da1275dd2d579
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7661
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer Sheva, Israel
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| Recommended Citation: | |
Katra I.,Yizhaq H.,Kok J.F.. Mechanisms limiting the growth of aeolian megaripples[J]. Geophysical Research Letters,2014-01-01,41(3).
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