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| Variation of Surface Wind Velocity and Sand Transport of Parabolic Dune at Southern Fringe of the Hobq Desert |
| Tao Binbin, Hasi Eerdun, Wugetemole, Guan Chao |
| College of Resource Science and Technology, Beijing Normal University, Beijing 100875, China |
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Abstract In the present study, we focused on a typical parabolic dune at the southern fringe of the Hobq desert to discuss the dynamic process acting on this type dune. We selected three longitudinal sections at the dune head which is active and one cross section traversing the two arms and the deflation basin between the arms. The wind velocity as well as sediment transport rate were observed simultaneously. At those three longitudinal sections, wind velocity and sediment transport rate increase with rising elevation along the stoss slope. Besides, the wind velocity and sediment transport rate reach their peaks near the crest, then reduce at the leeward slope between the crest and brink. It was found that the change trend of wind velocity and sediment transport rate at the three sections is similar, while their change modes are varied significantly. In a word, there is distinct spatial heterogeneity of the flow and sediment transport process on parabolic dune. When flow blows obliquely into the dune, the arms of parabolic dune are considered to have dynamic properties of longitudinal dunes. The wind velocity and sediment transport rate of two flanks of each arm are symmetric respectively. Sand source for this dune is limited and mainly comes from erosion of inner flank of its arms. Influenced by factors like special dune shapes and vegetation anchoring on and around the dune, mean wind velocity has almost no correlation with sediment transport rate at the toe as well as the lower part of slopes. Therefore, simple fractional speed-up ratio and sediment transport rate change between crest and toe are not effective and accurate to reveal the sophisticated morphodynamics of parabolic dunes.
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Received: 25 August 2014
Published: 20 November 2015
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2015, Vol. 35 
