Investigation of the age and migration of reversing dunes in Antarctica using GPR and OSL, with implications for GPR on Mars
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Ground-Penetrating Radar
Katabatic wind
Sand dune stabilization
Prevailing winds
Bedrock
Wind is the primary control on the formation of aeolian geomorphology. In this study, we combined wind regime data from automated weather stations in the western and southwestern Tengger Desert of the Inner Mongolia region in China with remote-sensing data to analyse the relationship between the wind energy environment and aeolian geomorphology. Tengger Desert is one of the main dust storm sources in northwestern China. Therefore, efforts aimed at controlling desertification and dust storm require a deeper understanding of the processes that govern the formation and subsequent evolution of dunes in this area. Wind speed was largest in the northwest (3.3 m/s in the Xiqu station) and smallest in the southeast (1.2 m/s in the Haizitan station). Potential sand transport was also largest in the northwest (195 in the Jiahe station) and smallest in the southeast (33 in the Tumen station). The sand-driving wind (5.92 m/s) directions were from the NW and SE quadrant across the study area, at >76% of all sand-driving wind, reaching 99% in the Tumen station. The sand-driving wind in the NW quadrant reached >48%, and in the SE quadrant, >12% of all sand-driving wind in all stations. In the study area, sand dunes included crescent, dune networks, transverse, and coppice dunes. Dune crest directions had similar trends from upwind to downwind, at 133° in the middle region, and 124° in the southwestern region. Mean dune spacing changed with dune patterns; the maximum spacing for crescent dunes was 147 m, for dune networks 118 m, and for transverse dunes it was 77 m. The mean crest length was 124 m (maximum) for crescent dunes in the northwest, 121 m for transverse dunes, and 84 m for dune networks. However, because of gullies in the southern region, the mean crest length was only 58 m (least) for the crescent dunes in that area. The defect density ranged from 0.007 to 0.014. The spatial differences in dune patterns reflected the evolution of the dune field, where older dunes had been formed upwind and younger downwind. Copyright © 2014 John Wiley & Sons, Ltd.
Desert (philosophy)
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Katabatic wind
Sand dune stabilization
Ground-Penetrating Radar
Prevailing winds
Bedform
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The sandy desertification is serious in Ulanbuhe desert. Based on the observed data about the sand movement by wind in the fixed dune, the semi-fixeddune and the moving dune, the determinant models of the sand-transporting ratio were constructed respectively for the three types of dunes by the multivariate statistical analysis method. The relationship between the sand-transporting ratio and wind velocity or height were quantitatively analyzed; and the structure of aeolian sand was also examined. Research results from our analysis will provide constructive suggestions for the sandy desertification control in China.
Desertification
Sand dune stabilization
Desert (philosophy)
Aeolian sand
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Aeolian sand dunes are continuously being discovered in inner dry lands and coastal areas, most of which have been formed over the Last Glacial Maximum. Presently, due to some natural and anthropogenic implications on earth, newly-born sand dunes are quickly emerging. Lake Urmia, the world's second largest permanent hypersaline lake, has started shrinking, vast lands comprising sand dunes over the western shore of the lake have appeared and one question has been playing on the minds of nearby dwellers: where are these sand dunes coming from, What there was not 15 years ago!! In the present study, the determination of the source of the Lake Urmia sand dunes in terms of the quantifying relative contribution of each upstream geomorphological/lithological unit has been performed using geochemical fingerprinting techniques. The findings demonstrate that the alluvial and the fluvial sediments of the western upstream catchment have been transported by water erosion and they accumulated in the lower reaches of the Kahriz River. Wind erosion, as a secondary agent, have carried the aeolian sand-sized sediments to the sand dune area. Hence, the Lake Urmia sand dunes have been originating from simultaneous and joint actions of alluvial, fluvial and aeolian processes.
Sand dune stabilization
Sand mining
Alluvial plain
Alluvial fan
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Desertification
Sand dune stabilization
Aeolian sand
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In a comprehensive survey of typical sections in the sand-dunes distribution area in the middle reach of the Yangtze River and Boyang Lake around,research shows that the grainsaize of sand-dunes deposits exhibit typical feature of aeolian sands: the distribution of sand-dunes is strap-shaped,which spread from north to south,and inosculate with the path of wind,and the height of sand-dunes is corresponding with the size of wind.All evidences show that these sand-dunes should be mainly caused by wind.
Sand dune stabilization
Yangtze river
Aeolian sand
Prevailing winds
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Katabatic wind
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Katabatic wind
Prevailing winds
Global wind patterns
Sea breeze
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Sand dune stabilization
Aeolian sand
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