| Desert and Desertification |
|
|
|
|
| Aeolian-sand Flow Structure Characteristics at Different Positions in Inter-dune Lowland |
| LI De-lu1, MAN Duo-qing1,2, ZHU Guo-qing1, WEI Lin-yuan1, TANG Jin-nian1 |
1.Minqin National Station for Desert Steppe Ecosystem Studies, Gansu Desert Control Research Institute, Wuwei 733000, Gansu, China;
2.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
|
|
|
|
Abstract Field observation of Aeolian-sand flux with stepped sand sampler was conducted to study the Aeolian-sand structure and aeolian sand movement law at different positions in inter-dune lowland in Minqin, Gansu of China, further to provide a theory basis for controlling blowing sand. Three stepped sand samplers of 80 cm height were installed along the main wind direction. Results indicate that there is a significant difference of sand transportation rate among the three positions, showing a decreasing trend along the main wind direction away from sand source. The larger the wind speed is, the more obvious the difference is. The reasons resulting in this difference are due to undulating terrain and sand supply abundance. Within 0-80 cm height, the relationship of sand transportation rate with wind speed fits a exponential function and an power relationship with height separately. The structural characteristic values (λ) of aeolian-sand flow are all larger than 1 in all position. There is an increasing trend of the λ value along the main wind direction away from sand source and the increase of wind speed, which indicates that aeolian-sand flow become more unsaturated.
|
|
Published: 20 September 2012
|
|
|
| [1]丁国栋.野外风沙流结构的定量研究[J].内蒙古林业科技, 1994,(4):37-40.[2]龚家栋,程国栋,张小由,等.黑河下游额济纳地区的环境演变[J].地球科学进展,2002,17(4):491-495.[3]马世威.风沙流结构的研究[J].中国沙漠,1988,8(3):8-22. [4]李钢铁,贾玉奎,王永生.乌兰布和沙漠风沙流结构的研究[J].干旱区资源与环境,2004,18(增刊):276-278.[5]刘陶,杨小平,董巨峰.巴丹吉林沙漠沙丘形态与风动力关系的初步研究[J].中国沙漠,2010,30(6):1285-1291.[6]汪季,胡志敏.近地表风沙流结构对不同植被覆盖度的响应[J].干旱区资源与环境,2005,19(5):30-33.[7]王翔宇,朴东均,丁国栋,等.流动沙丘风沙流结构的定量研究[J].水土保持研究,2008,15(2):36-39.[8]冯大军,倪晋仁,李振山.风沙流中不同粒径组沙粒的输沙率垂向分布实验研究[J].地理学报,2007,62(11):1194-1203.[9]吉力力·阿不都外力,刘东伟,徐俊荣.艾比湖干涸湖底不同地表类型风蚀强度及粉尘输移通量的风洞试验研究[J].中国沙漠,2009,29(1):63-67.[10]柳本立,张伟民,刘小宁.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.[11]李振山,张琦峰.风沙流的输沙率沿程变化规律[J].中国沙漠,2006,26(2):189-193.[12]Zhang W M.The gobi sand stream and its control over the top surface of the Mogao Grottoes,China[J].Bulletin of Engineering Geology and the Environment,2004,63:261-269.[13]Neuman C M.Particle transport and adjustments of the boundary layer over rough surfaces with an unrestricted,up wind supply of sediment[J].Geomorphology,1998,25:1-17.[14]张伟民,汪万福,张克存.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):1010-1020.[15]尉秋实,李得禄,赵明.土壤水分胁迫下沙漠葳的光合生理特征[J].西北植物学报,2007,27(12):2531-253.[16]郭学斌,郑智礼,梁守伦.山西北部荒漠化防治配套技术研究[M].北京:中国林业出版社,2006:76.[17]民勤治沙综合试验站.甘肃沙漠与治理[M].兰州:甘肃人民出版社,1975:35.[18]吴正.风沙地貌学[M].北京:科学出版社,1987:62-67.[19]哈斯.腾格里沙漠东南缘沙丘表面风沙流结构变异的初步研究[J].科学通报,2004,49(11):1009-1140.[20]杨景春.地貌学教程[M].北京:高等教育出版,1985:139.[21]甘肃省科学技术厅.荒漠化防治与治沙技术[M].兰州:甘肃人民出版社,2001:33.[22]张克存,俎瑞平,屈建军.腾格里沙漠东南缘输沙势与最大可能输沙量之比较[J].中国沙漠,2008,28(4):605-610.[23]董玉祥,马骏.风速对海岸沙丘表面风沙流结构影响的实证研究[J].干旱区资源与环境,2009,23(9):179-183. |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
2012, Vol. 32 
