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标题

库布齐沙漠北部横向沙丘地貌格局的空间变异

作者

管 超 哈斯额尔敦 安 晶 陶彬彬 刘 丹 周炎广

机构

北京师范大学资源学院

摘要

以库布齐沙漠北部横向沙丘及其流经的3条孔兑为研究对象,在每个孔兑切割的沙丘区域划定样方,采用基 于MATLAB平台的遥感影像沙脊线提取算法提取沙丘脊线,通过ArcGIS9.3量算每个样方的沙丘个数、脊线总长、脊 线平均长度、沙丘间距、平均沙丘走向以及缺陷密度等参数,着重通过沙丘地貌格局参数的变化分析横向沙丘地貌格局 的空间变异以及干旱区河流对其的影响.结果表明:① 顺风向(由西至东)上沙丘脊线平均长度呈线性增长、缺陷密度降 低,沙丘走向逐渐稳定在230°~50°方向,平均间距变大,沙丘地貌格局逐渐由分散向聚拢方式转变;垂直风向(由北至 南)上沙丘地貌格局参数由中心向南北两侧略有降低,沙丘类型由复合横向沙丘向简单新月形沙丘过渡,复合横向沙丘 占沙丘类型的80%;② 流经沙漠的孔兑通过自身切割作用与风水交互作用使得横向沙丘分割为相互独立的区域,每个 区域独立发育且互不影响,同时孔兑的存在改变了沿岸下风向3~5km 区域的地貌格局,更新了下风向沙物质来源,但 不会改变沙丘整体走向.

关键词

横向沙丘;沙丘脊线;沙丘地貌格局;孔兑

引用

管 超, 哈斯额尔敦, 安 晶, 陶彬彬, 刘 丹, 周炎广. 库布齐沙漠北部横向沙丘地貌格局的空间变异[J]. 北京师范大学学报(自然科学版),2015,51(Sup.1):13-22.

基金

国家自然科学基金资助项目(41171002)

分类号

P931.3

DOI

10.16360/j.cnki.jbnuns.2015.s1.003

Title

Spacial Variation of Transverse Dunes Landform Pattern in the north of Hobq Desert

Author

Liu GUAN Chao, HASI Erdun, AN Jing, TAO Binbin, LIU Dan, ZHOU Yanguang

Affiliations

College of Resources Science & Technology, Beijing Normal University

Abstract

The transverse dunes in the northern Hobq Desert and three kongduis flowing through the desert were investigated. Quadrats were drawn in all area divided by the kongduis, dune-crest-line-extracted algorithms were used to extract dune crest lines in remote sense images by MATLAB, to calculate the following parameters: number of dunes, total length of dune crest line, average length of dune crest line, distance between dunes, average trend of dunes and defect density, all by ArcGIS 9.3. Spatial variability of landform pattern of transverse dunes and effects of kongduis were investigated by parameter analysis. It was found that the average length of dune crest line increased linearly in the horizontal direction (form west to east), defect density decreased, the average trend of dunes was steady in the direction of 230°-50°, the average distance between dunes increased, the model of dune landform pattern converted from dispersion to aggregation gradually. The parameters were found to decrease slightly from the center area to the north side and south side in the vertical wind direction (form north to south), the type of dunes was found to convert from complex transverse dunes to simple barchans, complex transverse dunes accounted for 80% of all types of dunes. The kongduis flowing through desert were found to divide transverse dunes into independent areas by their functions of cutting and complex erosion by wind and water, every area was found to develop independently and not to influence each other. The existence of kongduis was found to change landform pattern of areas with a distance of 3-5 km in the downwind direction alongshore and to update the source of sands and not to change the whole direction of dunes.

Key words

transverse dunes; dune crest line; dune landform pattern; kongduis

cite

GUAN Chao, HASI Erdun, AN Jing, TAO Binbin, LIU Dan, ZHOU Yanguang .Spacial Variation of Transverse Dunes Landform Pattern in the north of Hobq Desert[J]. Journal of Beijing Normal University(Natural Science),2015,51(Sup.1):13-22.

DOI

10.16360/j.cnki.jbnuns.2015.s1.003

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
Designed by Mr. Sun Chumin. Email: cmsun@mail.bnu.edu.cn