Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 1875-9637 |
EISSN | 2212-1684 |
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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