Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1016/j.geomorph.2020.107350 |
| Rain-induced planar collapse of eolian dune slipfaces | |
| Stewart, Simon A. | |
| 通讯作者 | Stewart, SA |
| 来源期刊 | GEOMORPHOLOGY
 |
| ISSN | 0169-555X |
| EISSN | 1872-695X |
| 出版年 | 2020 |
| 卷号 | 368 |
| 英文摘要 | Decameter-scale eolian dunes were observed following a burst of intense rainfall in the sand sea of eastern Saudi Arabia. Planar, translational collapse structures developed over large areas of the dune slipfaces and were observed in pristine condition hours after their formation. Individual slipped blocks were approximately 10 cm deep over areas up to one hundred square meters. Observed geometries indicate a sequence of deformation beginning with downslope creep progressing to propagation of updip tensile fractures, finally thrust ramps developed at the downdip limits. Movement halted in all cases after about 10% displacement. A mechanical model is developed here based in part on snow avalanches and landslides to account for the observed deformation sequence. Rainwater loading increases differential stress in the dry internal parts of the dune. Rainwater infiltration also forms an impermeable wetting front below which air increases in pressure bringing the effective stress state towards the frictional sliding criterion, triggering downslope creep of the cohesive wet slab above. The wet slab has cohesion and tensile strength via proliferation of intergranular rainwater fluid bridges. Downslope creep led to updip tensile cracks releasing the slab, promoting slip and leading to downdip compressional failure with thrust structures. Exposure of the overpressured substrate in between the opening tensile cracks enabled pressure to bleed off ensuring the mechanism is self-limiting and therefore less hazardous than snow avalanches. The preservation potential of these structures is reasonably high due to their scale and likelihood of rapid burial by dune migration, but the distribution is patchy due to pre-existing moisture content of the dunes inhibiting the process, and the footprint of intense rainstorms usually being relatively small compared with the sand seas. (C) 2020 Elsevier B.V. All rights reserved. |
| 英文关键词 | Landslide Dune Avalanche Geohazard |
| 类型 | Article |
| 语种 | 英语 |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000571734700007 |
| WOS关键词 | SLIP-FAULT ZONES ; SAND ; INFILTRATION ; TEMPERATURE ; EVOLUTION ; HUMIDITY ; DESERT ; SYSTEM |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS研究方向 | Physical Geography ; Geology |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/326433 |
| 作者单位 | [Stewart, Simon A.] Saudi Aramco, Eastern Area Explorat Dept, Dhahran 31311, Saudi Arabia |
| 推荐引用方式 GB/T 7714 | Stewart, Simon A.. Rain-induced planar collapse of eolian dune slipfaces[J],2020,368. |
| APA | Stewart, Simon A..(2020).Rain-induced planar collapse of eolian dune slipfaces.GEOMORPHOLOGY,368. |
| MLA | Stewart, Simon A.."Rain-induced planar collapse of eolian dune slipfaces".GEOMORPHOLOGY 368(2020). |
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