Arid
DOI10.1016/j.geomorph.2017.08.009
Parabolic dune development modes according to shape at the southern fringes of the Hobq Desert, Inner Mongolia, China
Guan, Chao1; Hasi, Eerdun1; Zhang, Ping2; Tao, Binbin1; Liu, Dan1; Zhou, Yanguang1
通讯作者Hasi, Eerdun
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2017
卷号295页码:645-655
英文摘要

Since the 1970s, parabolic dunes at the southern fringe of the Hobq Desert, Inner Mongolia, China have exhibited many different shapes (V-shaped, U-shaped, and palmate) each with a unique mode of development. In the study area, parabolic dunes are mainly distributed in Regions A, B, and C with an intermittent river running from the south to the north. We used high-resolution remote-sensing images from 1970 to 2014 and RTK-GPS measurements to study the development modes of different dune shapes; the modes are characterized by the relationship between the intermittent river and dunes, formation of the incipient dune patterns, the predominant source supply of dunes, and the primary formation of different shapes (V-shaped, U-shaped, and palmate). Most parabolic dunes in Region A are V-shaped and closer to the bank of the river. The original barchans in this region exhibit "disconnected arms" behavior. With the sand blown out of the riverbed through gullies, the nebkhas on the disconnected arms acquire the external sand source through the "fertile island effect", thereby developing into triangular sand patches and further developing into V-shaped parabolic dunes. Most parabolic dunes in Regions B and C are palmate. The residual dunes cut by the re-channelization of river from transverse dune fields on the west bank are the main sand source of Region B. The parabolic dunes in Region C are the original barchans having then been transformed. The stoss slopes of V-shaped parabolic dunes along the riverbank are gradual and the dunes are flat in shape. The dune crest of V-shaped parabolic dune is the deposition area, which forms the "arc-shaped sand ridge". Their two arms are non-parallel; the lateral airflow of the arms jointly transport sand to the middle part of dunes, resulting in a narrower triangle that gradually becomes V-shaped. Palmate parabolic dunes have a steeper stoss slope and height. The dune crest of the palmate parabolic dune is the erosion area, which forms a long and narrow trough between nebkhas by the "funnelling effect". This process forces sand towards lee slopes, which transform from concave (original barchans) into convex, ultimately resulting in the formation of palmate parabolic dunes. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Parabolic dunes Dune development Morphological changes
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000413175000046
WOS关键词TRANSVERSE DUNE ; SAND DUNES ; DRYLAND ENVIRONMENTS ; SEDIMENT TRANSPORT ; FIELD PATTERN ; STOSS SLOPE ; SILVER PEAK ; WHITE SANDS ; GRAIN-SIZE ; NEW-MEXICO
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构北京师范大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199281
作者单位1.Beijing Normal Univ, Coll Resources Sci & Technol, Beijing 100875, Peoples R China;
2.Ningxia Univ, Sch Agr, Yinchuan 750021, Peoples R China
推荐引用方式
GB/T 7714
Guan, Chao,Hasi, Eerdun,Zhang, Ping,et al. Parabolic dune development modes according to shape at the southern fringes of the Hobq Desert, Inner Mongolia, China[J]. 北京师范大学,2017,295:645-655.
APA Guan, Chao,Hasi, Eerdun,Zhang, Ping,Tao, Binbin,Liu, Dan,&Zhou, Yanguang.(2017).Parabolic dune development modes according to shape at the southern fringes of the Hobq Desert, Inner Mongolia, China.GEOMORPHOLOGY,295,645-655.
MLA Guan, Chao,et al."Parabolic dune development modes according to shape at the southern fringes of the Hobq Desert, Inner Mongolia, China".GEOMORPHOLOGY 295(2017):645-655.
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