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| Dune Field Patterns and Wind Environments in the Middle Reaches of the Heihe Basin |
| Zhang zhengcai, Dong zhibao |
| Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract In the Middle reach of the Heihe Basin, desert is scattered distributed in the neighborhood or the inter-region of oasis of inland river basin. Recently, because of climate change and human activities in this region, oasis degraded, eco-environment deterioration, so, the environment of oasis and desert in this region need to be understood. Automatic weather station wind regime data, Moonlet Datum on Environment and Calamity Monitoring Forecast (HJ-1A/B) imagery and Google Earth high resolution imagery are used to analyze wind energy environment and dune field pattern in the Hexi Corridor Desert in this paper. The result indicated that wind energy environment can be divided into three regions, north region belong to high wind energy environment, middle region belong to intermediate, and south region belong to low. The resultant sand drift potential direction is from northwestern. Directional variability in the north and middle region belong to intermediate, but in the south, it belong to low. In the study region, dune field pattern conclude barchan dunes, reticulate dunes, pyramid dunes, linear dunes, shrub-coppice dunes, and sand-ridges. Wind region and wind energy environment control the formation of dune field patterns, but sand supply is also very important to dune formation. In the same wind regime, barchan dunes, reticulate dunes and pyramid dunes coexist, which is may caused by sand supply richness, from barchan dunes to reticulate dunes and pyramid dunes, sand supply increased.
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Received: 08 January 2013
Published: 20 March 2014
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2014, Vol. 34 
