Aeolian Dynamics Environments Near Earth Surface in Desert-Oasis Transitional Zone of Dunhuang Area
[Objective] The distribution pattern of sand-driven wind regimes,drift potentials,sand flux and particle size along the desert oasis transitional zone in the Dunhuang oasis adjacent to Mingsha Mountain was investigate in order to provide a theoretical basis for clarifying the process of aeolian sand in desert and oasis regions.[Methods] Based on the data from the synchronous wind velocity,sand flux and the size of sand grains,the characteristics of aeolian sand environments were calculated along the desert oasis transitional zone.[Results] Because of the differences of the material composition,spatial structure and hydrothermal conditions,wind velocity gradient and cumulative time of sand-driven wind existed significant differences.By the interaction of the desert and oasis,two dominant winds existed desert-oasis transitional zone.From the point of near surface granularity characteristics along the distribution,coarse sand content gradually reduced and silt and clay content increased relatively from the desert to the oasis.Desert-oasis transitional zone was the important part of the ecosystem,and had significance in maintaining a stable transition.[Conclusion] For the oasis sand hazard prevention and control,we should give full consideration to the role of regulation and buffering of desert-oasis transitional zone in view of atmospheric circulation.
desert-oasis transitional zonesand-driven winddrift potentialscharacteristics of sand grains
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