Abstract
Wind tunnel studies, which remain limited, are an important tool to understand the aeolian processes of dried-up riverbeds. The particle size, chemical composition, and the mineral contents of sediments arising from the dried river beds are poorly understood. Dried-up riverbeds cover a wide area in the Hexi Corridor, China, and comprise a complex synthesis of different land surfaces, including aeolian deposits, pavement surfaces, and Takyr crust. The results of the present wind tunnel experiment suggest that aeolian transport from the dried-up riverbeds of the Hexi Corridor ranges from 0 to 177.04 g/m2/min and that dry riverbeds could be one of the main sources of dust emissions in this region. As soon as the wind velocity reaches 16 m/s and assuming that there are abundant source materials available, aeolian transport intensity increases rapidly. The dried-up riverbed sediment and the associated aeolian transported material were composed mainly of fine and medium sands. However, the transported samples were coarser than the bed samples, because of the sorting effect of the aeolian processes on the sediment. The aeolian processes also led to regional elemental migration and mineral composition variations.
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Acknowledgments
This work was supported by a grant from the National Nature Science Foundation of China (41101006). We thank Mr. Hong Li for operating the wind tunnel and Ms. Fang Li for testing the mineral composition. We appreciate critical reviews of an anonymous referee, which helped to improve our thinking and the manuscript.
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Zhang, C., Wang, X., Dong, Z. et al. Aeolian process of the dried-up riverbeds of the Hexi Corridor, China: a wind tunnel experiment. Environ Monit Assess 189, 419 (2017). https://doi.org/10.1007/s10661-017-6132-y
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DOI: https://doi.org/10.1007/s10661-017-6132-y