毛乌素沙地南缘横向沙丘粒度分布及其对风向变化的响应
收稿日期: 2006-02-01
修回日期: 2006-11-01
网络出版日期: 2006-11-25
基金资助
国家自然科学基金( 40471013) 资助.
Gr ain- size Var iation on a Tr ansver se Dune and Response to Wind Dir ection Changes on Southern Edge of Mu Us Deser t
Received date: 2006-02-01
Revised date: 2006-11-01
Online published: 2006-11-25
在风季发生转换期间， 根据不同方向风的持续时间， 对毛乌素沙地南缘长48m， 高8m 的 横向沙丘进行了7 次断面形态测量和表面沉积物采样分析。结果表明， 横向沙丘断面形态及表面 沉积物粒度分布随区域气流方向和强度而发生变化。在沙丘各部位， 丘顶及附近两侧的沙粒活动 性强， 表面沉积物粒径及分选参数变化显著。在粒径及分选参数中， 粒径频率曲线、平均粒径和偏 度对风的作用比较敏感， 随时间的变化也明显， 利用它们的变化可以解释区域气流变化对沙丘的 影响。风向发生转换时期的短期观测和采样分析结果进一步说明采样时间是影响沙丘表面沉积 物粒度特征的重要因素。
哈斯,庄燕美,王蕾,王志 . 毛乌素沙地南缘横向沙丘粒度分布及其对风向变化的响应[J]. 地理科学进展, 2006 , 25(6) : 42 -51 . DOI: 10.11820/dlkxjz.2006.06.005
The transect data of morphology and grain- size samples has been obtained from a transverse dune with 8m high and 48m long in the south edge of Mu Us Sandy Land in the period of wind direction transitions. The results show that there exist temporal changes in grainsize and its spatial pattern on transverse dune responding to different wind directions and magnitudes. These changes are more obvious in the creastal zone of dune with more sand activity. Great temporal changes take place in the grain size frequency distribution, mean grain size and skewness among the grain- size parameters. This suggests that these parameters are most susceptive to the wind, and so their changes can be used to explain the difference of dunes in the influence of different wind. The evidences of the wind direction, dune morphology and grain- size characteristics identified there not only have seasonal but daily changes in grain- size patterns on the dune when wind direction changes. It further confirms the conclusion that the time of sampling is as important as the site.
Key words： Grain- size; Morphology wind direction; Mu Us sandy land; transverse dune
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