| 腾格里沙漠南部格状沙丘的形态演变及移动特征 |
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| 引用本文： | 杨馥宁,吕萍,马芳,曹敏,肖南,顾立霞,杨迎.腾格里沙漠南部格状沙丘的形态演变及移动特征[J].中国沙漠,2023,43(1):107-115. |
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| 作者姓名： | 杨馥宁 吕萍 马芳 曹敏 肖南 顾立霞 杨迎 |
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| 作者单位： | 1.陕西师范大学 地理科学与旅游学院，陕西 西安 710119;2.内蒙古师范大学 地理科学学院，内蒙古 呼和浩特 010022 |
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| 基金项目： | 国家自然科学基金项目(41871011) |
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| 摘 要： | 沙丘的形态变化与移动蕴含区域风沙环境和地貌演化的关键信息，是风沙地貌研究的重要内容。以腾格里沙漠南缘的长格状和方格状沙丘为研究对象，利用风况资料和Google Earth卫星影像，监测2009—2020年两种格状沙丘的形态变化并分析其移动特征。结果表明：(1)腾格里沙漠西南缘和东南缘的主风向均为西北风，长格状沙丘分布区的次风向为东南风，方格状沙丘分布区次风向为东风和东南风，都属于低风能环境、中变率风况。西南部风能环境大于东南部，研究区近10年风动力呈衰减趋势。(2)格状沙丘的主副梁长度和间距在增加，其中，长格状沙丘高度增加，方格状沙丘高度在降低。沙丘主梁向东偏移，副梁向南偏移，形态整体保持稳定。(3)长格状沙丘平均移动速率为1.57～1.71 m·a-1，方格状沙丘平均移动速率为1.63～2.01 m·a-1，沙丘平均移动方向与合成输沙方向基本一致，沙丘的体积是造成移动速率差异的主因。
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| 关 键 词： | 沙丘移动 格状沙丘 沙丘形态演变 风况 腾格里沙漠 |
| 收稿时间： | 2022-07-01 |
| 修稿时间： | 2022-07-31 |
Morphological evolution and migration characteristics of reticulate dunes at southern fringe of Tengger Desert |
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| Funing Yang,Lü Ping,Fang Ma,Min Cao,Nan Xiao,Lixia Gu,Ying Yang.Morphological evolution and migration characteristics of reticulate dunes at southern fringe of Tengger Desert[J].Journal of Desert Research,2023,43(1):107-115. |
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| Authors: | Funing Yang Lü Ping Fang Ma Min Cao Nan Xiao Lixia Gu Ying Yang |
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| Institution: | 1.School of Geography and Tourism，Shaanxi Normal University，Xi'an 710119，China;2.College of Geographical Science，Inner Mongolia Normal University，Hohhot 010022，China |
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| Abstract: | The morphological change and migration of dunes contain the key information of regional aeolian environment and landform evolution， which is an important issue in aeolian geomorphology. In this paper， the rectangular dune networks and square dune networks in the southern edge of Tengger Desert are taken as an example， we used wind data and Google Earth satellite images to monitor the morphological changes of reticulate dunes from 2009 to 2020 and analyze their migration characteristics. The results showed that： （1）The prevailing wind direction in the southwest and southeast of Tengger Desert are northwest wind. The secondary wind direction in the distribution area of rectangular dune networks is southeast wind， and that of square dune networks is east wind and southeast. The wind regime features are belonging to low wind energy environment and intermediate wind direction variability. The wind energy environment in the southwest is stronger than that in the southeast. The wind power in the study area showed a decreasing trend in recent ten years. （2） The length and spacing of ridges of reticulate dunes are increasing， and the height of rectangular dune networks is increasing， while that of square dune networks is decreasing. The orientation of the primary ridge is shifted to the east， and the secondary ridge is shifted to the south， while the overall morphology of the dunes remains stable. （3） The average migration rate of rectangular dune networks is 1.57-1.71 m·a-1， and that of square dune networks is 1.63-2.01 m·a-1. The average migration direction of dunes is similar to the resultant drift direction. The volume of dune is the main reason affecting the difference of migration speed. |
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| Keywords: | dune migration reticulate dune dune morphology evolution wind regime Tengger Desert |
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