摘要
通过风资料的统计和计算,对塔克拉玛于沙漠风沙活动强度特征进行了系统研究.结果表明,塔克拉玛干沙漠年平均风速较小,在沙漠内部年平均风速与温度变化呈现'风热同步'现象;有效起沙风作用时间存在明显区域差异,随着风速等级的增加,其出现的频率相应减少,基本上都集中在6.1～10.0m/s之间;输沙势和最大可能输沙量,除若羌地区外,整个沙漠属于低风能环境,且存在很大区域差异,对输沙贡献最大的风速以9.0～11.0m/s为主.
The intensity of sand-drift activities is the important theoretic base for both studying the formation and evolution of aeolian geomorphology and carrying out the sand-damage control measures. Based on statistics and calculations of wind data, this paper studied the intensities of the sand-drift of Taklimakan Desert and drawn some preliminary conclusions as follows. ① Except Ruoqiang district, the whole Taklimakan Desert belongs to low-energy environment and the drift potential in most areas is less than 200VU. ② With the increase of wind velocity, its frequency decreases gradually, so the most effective sandmoving winds range from 6. 1m/s to 10. 0m/s, but the most contributors to sand flux concentrate between 9.0 m/s and 11.0 m/s. ③The intensity of sand-drift activities has great temporal and spatial variations. As seasons concerned, the sand-drift activity is the strongest during spring and summer and is the weakest in winter, and the autumn lies between them. However, in the interior of the desert there is a phenomenon called as “wind-temperature synchronization”, that is, the monthly mean temperature and wind velocity get their maximum values during June and July. On the fringe of the desert, the maximum temperature occurs in June and July, while the maximum wind velocity in April and May. According to the calculated results of drift potential and sand flux, the intensity of sanddrift activities is stronger in the central and eastern parts than that of western, southern and southwestern parts. Although this study has got some results, there is still some important work to carry out in future. At first, to give a rational explanation of the temporal and spatial variations of the intensity of sand-drift activities, in combination with the circulation patterns at different elevations. Secondly, to give a detailed explanation of the “wind-temperature synchronization”phenomenon through scientific experiments. And finally, to integrate the intensity of sand-drift activities with the degree of sand dune activities, so as to provide more effective base for sand-damage control measures.
出处
《地理研究》
CSCD
北大核心
2005年第5期699-707,共9页
Geographical Research
基金
国家重点基础研究发展规划项目(G2000048705)
所创新项目(2004105
2003110)资助
