| Desert and Desertification |
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| Vertical Distribution of Aeolian Sand Mass Flux based on Field Observation at Southern Rim of the Taklimakan Desert |
| YANG Dong-liang1,2,3, WANG Xue-qin1, HU Yong-feng1,2, YANG Fan1,2, HAN Zhang-yong1,2 |
1.Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3.Xinjiang Cele National Field Scientific Observation and Research Station of Desertification and Grassland Ecosystem, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Cele 848300, Xinjiang, China |
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Abstract Sand transport flux, wind speed and wind direction were observed simultaneously on bare sand surface at the southern rim of the Taklimakan Desert from April to June in 2010. Vertical distribution of sand transport flux was studied with the 28 groups of observed data. Results showed that total transport rate increased slowly when wind velocity ranged from 4.5 m·s-1 to 8 m·s-1 and increased sharply when wind velocity was higher than 8.0 m·s-1. The percentage of transport rate varied unnoticeably at lower wind velocities at the four examined layers (1 cm, 3 cm, 9 cm and 19 cm), but when wind velocity was higher than 6.6 m·s-1, the percentage of transport rate decreased at the lowest layer (1 cm) while increased at the highest layer (19 cm), yet it still remained unnoticeable variety at the other two layers (3 cm and 9 cm). The processes of surface erosion and sediment deposition had effect on vertical distribution of sand flux, and average saltation height reflected characteristics of these aeolian processes to some extent. Of the four frequently used models that described vertical distribution of sand flux, Zingg's modified power model produced the best fitness but the least message related to sand flow in its fitting parameters; the basic exponential model possessed the most message related to sand flow but the worst fitness; the exponential model took on a relatively good performance on both fitness and physical significance of parameters while Fryrears modified power model was reverse. At the fine sand dominated south margin of the Taklimakan Desert, the exponential model presented better fitness than the basic power model, and validated and enriched the conclusion that was drawn from wind tunnel experiment. Based on comprehensive comparison, the exponential model was considered to be the best one to describe vertical distribution of sand flux at the southern rim of the Taklimakan Desert.
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Received: 08 November 2010
Published: 20 May 2012
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| [1]李振山,倪晋仁.风沙流研究的历史、现状及其趋势[J].干旱区资源与环境,1998,12(3):89-97.[2]柳本立,张伟民,刘小宁,等.莫高窟顶戈壁偏东风作用下输沙率变化的观测研究[J].中国沙漠,2010,30(3):516-521.[3]廖空太,李耀辉,刘虎俊,等.库姆塔格沙漠羽毛状沙垄风沙活动强度特征[J].中国沙漠,2008,28(3):399-404. [4]屈建军,井哲帆,张克存,等.HDPE蜂巢式固沙障研制与防沙效应实验研究[J].中国沙漠,2008,28(4):599-604.[5]冯大军,倪晋仁,李振山.风沙流中不同粒径组沙粒的输沙量垂向分布实验研究[J].地理学报,2007,62(11):1194-1200.[6]Butterfield G R.Near-bed mass flux profiles in aeolian sand transport:High-resolution measurements in a wind tunnel[J].Earth Surface Processes and Landforms,1999,24:393-412.[7]吴正.风沙地貌与治沙工程学[M].北京:科学出版社,2003:61-71.[8]Panebianco J E,Buschiazzo D E,Zobeck T M.Comparison of different mass transport calculation methods for wind erosion quantification purposes[J].Earth Surface Processes and Landforms,2010,24:393-412.[9]Williams G.Some aspects of Aeolian transport load[J].Sedimentology,1964,3:257-287.[10]Dong Z B,Liu X P,Wang H T,et al.The flux profile of blowing sand cloud:A wind tunnel investigation[J].Geomorphology,2002,49:219-230.[11]Zobeck T M,Fryrear D W.Chemical and physical characteristics of windblown sediment I.Quantities and physical characteristic[J].Transactions of the ASAE,1986,29(4):1032-1036.[12]Offer Z Y,Goossens D.Thirteen years of aeolian dust dynamics in a desert region(Negev desert,Israel):Analysis of horizontal and vertical dust flux,vertical dust distribution and dust grain size[J].Journal of Arid Environments,2004,57:117-140.[13]Mertia R S,Privabrata Santra,Kandpal B K,et al.Mass-height profile and total mass transport of wind eroded aeolian sediments from rangelands of the Indian Thar Desert[J].Aeolian Research,2010,2(2-3):135-142.[14]Nickling W G.Eolian sediment transport during dust storms:Slims River Valley,Yukon Territory[J].Canadian Journal of Earth Sciences,1978,15(4):1069-1084.[15]Liu X,Dong Z,Wang X.Wind tunnel modeling and measurements of the flux of wind-blown sand[J].Journal of Arid Environments,2006,66:657-672.[16]Gillette D A,Pitchford A M.Sand flux in the northern Chihuahuan desert,New Mexico,USA,and the influence of mesquite-dominated landscapes[J].Journal of Geophysical Research,2004,109,F04003.[17]Ni J R,Li Z S,Mendoza C.Vertical profiles of aeolian sand mass flux[J].Geomorphology,2002,49:205-218.[18]Fryrear D W,Stout J E,Hagen L J,et al.Wind erosion:Field measurement and analysis[J].Transactions of the ASAE,1991,34(1):155-160.[19]Vories E D,Fryrear D W.Vertical distribution of wind-eroded soil over a smooth,bare field[J].Transactions of the ASAE,1991,34(4):1763-1768.[20]Chen W N,Yang Z T,Zhang J S,et al.Vertical distribution of wind-blown sand flux in the surface layer,Taklimakan Desert,Central Asia[J].Physical Geography,1996,17(3):193-218. [21]Funk R,Skidmore E L,Hagen L J.Comparison of wind erosion measurements in Germany with simulated soil losses by WEPS[J].Environmental Modelling & Software,2004,19:177-183.[22]Li Z S,Feng D J,Wu S L,et al.Grain size and transport characteristics of non-uniform sand in Aeolian saltation[J].Geomorphology,2008,100:484-493.[23]董玉祥,Hesp P A,Namikas S L,等.海岸横向沙脊表面风沙流结构粒度响应的野外观测研究[J].中国沙漠,2008,28(6):1022-1028.[24]张立运,夏阳.塔克拉玛干沙漠南缘绿洲外围的天然植被[J].干旱区研究,1997,14(3):16-22.[25]钱亦兵,张希明,李晓明.塔克拉玛干沙漠南缘绿洲沙物质粒度特征[J].中国沙漠,1995,15(2):131-135.[26]刑文娟,雷家强,王海峰,等.荒漠-绿洲过渡带风况及输沙势分析——以策勒县为例[J].干旱区研究,2008,25(6):894-898.[27]张伟民,汪万福,张克存,等.不同沙源供给条件下砾石床面的风沙流结构与蚀积量变化风洞实验研究[J].中国沙漠,2009,29(6):1015-1020. |
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2012, Vol. 32 
