干旱区科学2010，Vol.2Issue(4)：272-278,7.DOI:10.3724/SP.J.1227.2010.00272
Dynamic changes of a typical linear dune in the Tengger Desert
Dynamic changes of a typical linear dune in the Tengger Desert
摘要
Abstract
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.关键词
linear sand dune/dynamic change/morphological feature/Tengger DesertKey words
linear sand dune/dynamic change/morphological feature/Tengger Desert分类
农业科技引用本文复制引用
KeCun ZHANG,KenJi KAI,JianJun QU,YuQuan LING,QingHe NIU..Dynamic changes of a typical linear dune in the Tengger Desert[J].干旱区科学,2010,2(4):272-278,7.基金项目
This research was supported by the National Key Basic Research Development Program of China (2009BAC54B01-1)and National Natural Science Foundation of China (41071009 and 40701171). The authors are grateful to the editors and the anonymous reviewers for their insightful comments and suggestious. （2009BAC54B01-1）
