首页|Dynamic changes of a typical linear dune in the Tengger Desert
Dynamic changes of a typical linear dune in the Tengger Desert
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国家科技期刊平台
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NSTL
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The dynamical processes of a typical linear dune including morphological features,dune ridge swing range and crest height were investigated at different monitoring periods in the hinterland of Tengger Desert.The results indicated that the development of linear dune depends on not only the northwesterly prevailing wind,but also the winds from northeast and southwest.The dune ridge swayed along its fundamental strike and took on an eastward movement gradually.The original dune strike was NW70° on August 3,1994,and then changed to NE15° on April 21,2001.The dune crest increased by 1.8 m longitudinally,which manifested strong wind-blown sand activities in this region.Wind erosion frequently occured at the bottom of sand dune,while sand accumulation appeared on its mid-upper section.The mean wind erosion depth was 25 cm on the bottom of linear dune and the height difference of the control points on the dune's ridge was 1.13 m.Although the linear dune swayed laterally,the horizontal displacement of its ridge moved eastward 5.8 m averagely.The swing range of the dune crest line is very distinct,with a maximum value of 13.2 m.The highest site on the K-profile swayed on both sides of the dune ridge and the heights were 19.88 m at the control point K2,19.61 m at K6 and 19.05 m at K7,respectively.The results indicated that the lateral swing of the linear dune was distinct under the northwesterly wind and it moved toward east gradually.
linear sand dunedynamic changemorphological featureTengger Desert
Dunhuang Gobi and Desert Ecology and Environment Research Station,Cold and Add Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China
Graduate School of Environmental Studies,Nagoya University,Nagoya 4648601,Japan
National Key Basic Research Development Program of China国家自然科学基金国家自然科学基金
国家科技期刊平台
NSTL
万方数据
