Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL088773 |
Macroscopic flow disequilibrium over aeolian dune fields | |
A. Gunn; P. Schmutz; M. Wanker; D. A. Edmonds; R. C. Ewing; D. J. Jerolmack | |
2020-08-06 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Aeolian dune fields are self‐organized patterns formed by wind‐blown sand. Dunes are topographic roughness elements that impose drag on the atmospheric boundary layer (ABL), creating a natural coupling between form and flow. While the steady‐state influence of drag on the ABL is well studied, non‐equilibrium effects due to roughness transitions are less understood. Here we examine the large‐scale coupling between the ABL and an entire dune field. Field observations at White Sands, New Mexico, reveal a concomitant decline in wind speed and sand flux downwind of the transition from smooth playa to rough dunes at the upwind dune‐field margin, that affects the entire ~10‐km long dune field. Using a theory for the system that accounts for the observations, we generalize to other roughness scenarios. We find that, via transitional ABL dynamics, aeolian sediment aggradation can be influenced by roughness both inside and outside dune fields. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/287670 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | A. Gunn,P. Schmutz,M. Wanker,et al. Macroscopic flow disequilibrium over aeolian dune fields[J]. Geophysical Research Letters,2020. |
APA | A. Gunn,P. Schmutz,M. Wanker,D. A. Edmonds,R. C. Ewing,&D. J. Jerolmack.(2020).Macroscopic flow disequilibrium over aeolian dune fields.Geophysical Research Letters. |
MLA | A. Gunn,et al."Macroscopic flow disequilibrium over aeolian dune fields".Geophysical Research Letters (2020). |
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