Arid
DOI10.1016/j.aeolia.2015.11.003
Field observations of wind profiles and sand fluxes above the windward slope of a sand dune before and after the establishment of semi-buried straw checkerboard barriers
Zhang, Chunlai1; Li, Qing1; Zhou, Na1; Zhang, Jiaqiong2; Kang, Liqiang1; Shen, Yaping1; Jia, Wenru1
通讯作者Zhang, Chunlai
来源期刊AEOLIAN RESEARCH
ISSN1875-9637
EISSN2212-1684
出版年2016
卷号20页码:59-70
英文摘要

Straw checkerboard barriers are effective and widely used measures to control near-surface sand flow. The present study measured the wind profiles and sand mass flux above the windward slope of a transverse dune before and after the establishment of semi-buried straw checkerboards. The 0.2 m high checkerboards enhanced the aerodynamic roughness length to larger than 0.02 m, which was two to three orders of magnitude higher than that of the bare sand. The modified Charnock model predicted the roughness length of the sand bed during saltation well, with C-m = 0.138 +/- 0.003. For the checker-boards, z(0) increased slowly to a level around 0.037 m with increasing wind velocity and the rate of increase tended to slow down in strong wind. The barriers reduced sand flux and altered its vertical distribution. The total height-integrated dimensionless mass flux of saltating particles (q(0)) above bare sand followed the relationship In q(0) = a + b(u(*t)/u(*)) + c(u(*t)/u(*))(2), with a peak at u(*)/u(*t) approximate to 2, whereas a possible peak appeared at u(*)/u(*t) approximate to 1.5 above 1 m x 1m straw checkerboards. The vertical distribution of mass flux above these barriers resembled an "elephant trunk", with maximum mass flux at 0.05-0.2 m above the bed, in contrast with the continuously and rapidly decreasing mass flux with increasing height above the bare sand. The influences of the barriers on the wind and sand flow prevent dune movement and alter the evolution of dune morphology. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Wind profile Aerodynamic roughness length Sand flux Straw checkerboard barriers
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000372381500006
WOS关键词SEDIMENT TRANSPORT ; SPARSE VEGETATION ; AEOLIAN SALTATION ; EOLIAN SALTATION ; ROUGHNESS LENGTH ; BLOWN SAND ; DESERT ; TUNNEL ; LAYER ; EROSION
WOS类目Geography, Physical
WOS研究方向Physical Geography
来源机构北京师范大学 ; 西北农林科技大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/191004
作者单位1.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, MOE Engn Res Ctr Desertificat & Blown Sand Contro, Beijing 100875, Peoples R China;
2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714
Zhang, Chunlai,Li, Qing,Zhou, Na,et al. Field observations of wind profiles and sand fluxes above the windward slope of a sand dune before and after the establishment of semi-buried straw checkerboard barriers[J]. 北京师范大学, 西北农林科技大学,2016,20:59-70.
APA Zhang, Chunlai.,Li, Qing.,Zhou, Na.,Zhang, Jiaqiong.,Kang, Liqiang.,...&Jia, Wenru.(2016).Field observations of wind profiles and sand fluxes above the windward slope of a sand dune before and after the establishment of semi-buried straw checkerboard barriers.AEOLIAN RESEARCH,20,59-70.
MLA Zhang, Chunlai,et al."Field observations of wind profiles and sand fluxes above the windward slope of a sand dune before and after the establishment of semi-buried straw checkerboard barriers".AEOLIAN RESEARCH 20(2016):59-70.
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