全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
地理科学  2015 

横向沙丘表面气流湍流特征野外观测

, PP. 652-657

Keywords: 反向流,湍流强度,雷诺应力,气流丰富度

Full-Text   Cite this paper   Add to My Lib

Abstract:

沙丘形态动力学特征是风沙地貌的重要研究内容之一,受观测技术等的限制,现有的关于沙丘形态动力学特征的研究成果还不能满足沙丘形成与演化过程研究的需要。利用三维超声风速仪对腾格里沙漠的横向沙丘表面气流特征进行野外观测,结果表明,沙丘脊线和迎风坡中部的气流均为未偏向流,而沙丘背风坡不同高度的气流包括反向流,偏向流和未偏向流。湍流强度、雷诺应力和气流丰富度随气流方向变化而变化,其在沙丘脊线和中部的变化趋势比较简单且有大致相似的规律,而其在沙丘背风坡不同高度比较复杂。

References

[1]  Ewing R C,Kocurek G.Aeolian dune-field pattern boundary conditions[J].Geomorphology,2010,114 (3):175-187.
[2]  韩致文,缑倩倩,杜鹤强,等.新月形沙丘表面100 cm 高度内风 沙流输沙量垂直分布函数分段拟合[J]. 地理科学, 2012, 32 (7): 892~897.
[3]  王训明,董治宝,赵爱国.简单横向沙丘表面物质组成、气流分 布及其在动力学过程中的意义[J].干旱区资源与环境,2004,18 (4):29~33.
[4]  周娜,张春来,刘永刚.雅鲁藏布江米林宽谷段新月形沙丘粒 度分异研究[J].地理科学,2011,31(8):958~963.
[5]  董治宝,苏志珠,钱广强,等.库姆塔格沙漠风沙地貌[M].北京: 科学出版社,2011.
[6]  哈斯,董光荣,王贵勇.腾格里沙漠东南缘格状沙丘的形态- 动力学研究[J].中国科学(D),1999,29(5):466~471.
[7]  哈斯,王贵勇,董光荣.沙丘背风侧气流及其沉积类型与意义[J].沉积学报,2001,19(1):96~100.
[8]  钱广强,董治宝,罗万银,等.横向沙丘背风侧气流重附风洞模拟[J].中国沙漠,2008,28(1):16~20.
[9]  张正偲,董治宝,赵爱国,等.库姆塔格沙漠风沙活动特征[J].干 旱区地理,2010,33(6):1~9.
[10]  张正偲,董治宝,钱广强,等.腾格里沙漠西部和西南部风能环 境与风沙地貌[J].中国沙漠,2012,32(6):1528~1533.
[11]  张加琼,张春来,王焕芝.包兰铁路沙坡头段防护体系生物土壤 结皮沉积特征及其风沙环境意义[J].地理科学,2013,33(9): 1117~1124.
[12]  Zhang Z C,Dong Z B,Zhao A G.Observations of Gobi aeolian transport and wind fetch effect[J].Science China Earth Sciences, 2012,55(8):1323-1328.
[13]  Bauer B O,Davidson-Arnott R G D,Walker I J,et al.Wind direction and complex sediment transport response across a beach-dune system[J].Earth Surface Processes and Landforms, 2012,37(15):1661-1677.
[14]  Lynch K,Jackson D W T,Cooper J A G.Coastal foredune topography as a control on secondary airflow regimes under offshore winds[J].Earth Surface Processes and Landforms,2010,35(3): 344-353.
[15]  Sweet M L,Kocurek G.An empirical model of Aeolian dune lee-face airflow[J].Sedimentology,1990,37(6):1023-1038.
[16]  Jackson D W T,Beyers M,Delgado-Fernandez I,et al.Airflow reversal and alternating corkscrew vortices in foredune wake zones during perpendicular and oblique offshore winds[J].Geomorphology, 2013,187(1):86-93.
[17]  Walker I J,Nickling W G.Dynamics of secondary airflow and sediment transport over and in the lee of transverse dunes[J]. Progress in Physical Geography,2002,26(1):47-75.
[18]  Walker I J,Nickling W G.Simulation and measurement of surface shear stress over isolated and closely spaced transverse dunes in a wind tunne[J].Earth Surface Processes and Landforms, 2003,28(10):1111-1124.
[19]  Wiggs G F S,Weaver C M.Turbulent flow structures and aeolian sediment transport over a barchan sand dune[J].Geophysical Research Letters,2012,39:L05404.
[20]  Yang X P,Scuderi L,Liu T,et al.Formation of the highest sand dunes on Earth[J].Geomorphology,2011,135(1-2):108-116.
[21]  Chapman C A,Walker I J,Hesp P A,et al.Turbulent Reynolds stress and quadrant event activity in wind flow over a coastal foredune[J].Geomorphology,2012,(151-152):1-12.
[22]  Walker I J.Physical and logistical considerations of using ultrasonic anemometers in aeolian sediment transport research[J]. Geomorphology,2005,68(1-2):57-76.
[23]  Weaver C M,Wiggs G F S.Field measurements of mean and turbulent airflow over a barchan sand dune[J].Geomorphology, 2011,128(1-2):32-41.
[24]  Wiggs G F S,Livingstone I,Warren A.The role of streamline curvature in sand dune dynamics:evidence from field and wind tunnel measurements[J].Geomorphology,1996,17(1-3):29-46.
[25]  Bauer B O,Yi J,Namikas S L,et al.Event detection and conditional averaging in unsteady Aeolian systems[J].Journal of Arid Environmental,1998,39(3):345-375.
[26]  Sterk G,Jacobs A F G,van Boxel J H.The effect of turbulent flow structures on saltation sand transport in the atmospheric boundary layer[J].Earth Surface Processes and Landforms,1998, 23(10):877-887.
[27]  Leender J K.Wind forces and related saltation transport[J].Geomorpholgy, 2005,71(3-4):357-372.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133