库布齐沙漠南缘沙丘固定与活化过程中的形态演变

发布时间：2018-06-29 08:05

本文选题：沙丘 + 固定　；参考：《中国沙漠》2016年05期

【摘要】：以1998—2014年5期库布齐沙漠南缘的遥感影像为主要数据源,结合野外调查分析了沙丘固定与活化过程中的形态演变,探讨了区域风况和降水等气象要素对沙丘固定与活化及形态演变的影响。结果表明:研究区沙丘随降水量的年际波动经历了固定-活化-再固定3个阶段。监测初期的片状流动沙丘演变为大型抛物线形沙丘并得以固定,固定的抛物线形沙丘以发育风蚀坑形式活化,进而形成多个抛物线形沙丘,最后这些沙丘又被植被固定,沙丘形态趋于更加复杂。但在此过程中,风的作用并不显著。研究区抛物线形沙丘既可起源于新月形沙丘或片状流沙,也可由风蚀坑发育而成,其中植被作为沙丘的重要组成部分,起着重要作用。同时发现在抛物线形沙丘移动过程中,当背风坡发育滑落面时,沙丘的移动最快。
[Abstract]:Taking the remote sensing images of the southern edge of Kubuqi Desert from 1998 to 2014 as the main data sources, the morphological evolution during the process of sand dune fixation and activation was analyzed in combination with field investigation. The effects of regional wind and precipitation on sand dune fixation, activation and morphological evolution are discussed. The results show that the interannual fluctuation of sand dunes with precipitation in the study area has experienced three stages: fixation, activation and refixation. At the beginning of the monitoring period, the sheet flow dune evolved into a large parabolic dune and was fixed. The fixed parabolic dune was activated in the form of a developed wind erosion pit, and then formed multiple parabolic dunes, which were finally fixed by vegetation. Sand dune forms tend to be more complex. However, in this process, the role of wind is not significant. The parabolic sand dunes in the study area can be derived from either crescent dune or flaky quicksand, or developed from wind erosion pits, in which vegetation plays an important role as an important part of sand dunes. It is also found that during the movement of parabolic dunes, the sand dunes move fastest when the leeward slope develops a sliding surface.
【作者单位】：北京师范大学资源学院;
【基金】：十三五国家重点研发计划课题(2016YFC0500805) 国家自然科学基金项目(41671002,41171002)
【分类号】：P931.3;P237

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