Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0169-555X |
EISSN | 1872-695X |
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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