Barchans of Minqin:quantifying migration rate of a barchan  

作　　者：ZhenTing Wang Hui Zhao KeCun Zhang XiaoZong Ren FaHu Chen Tao Wang 

机构地区：[1]Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China. [2]CAEP,Key Laboratory of Western China’s Environmental Systems(Ministry of Education),Lanzhou University,Lanzhou,Gansu 730000,China.

出　　处：《Research in Cold and Arid Regions》2009年第2期151-156,共6页寒旱区科学(英文版)

基　　金：supported by 973 project No. 2000048700;NSFC projects No. 40601053 and 40872108;Ministry of Science and Technology of China project No. 2006FY110800

摘　　要：The migration speed of a typical barchan on the border of Minqin oasis,Gansu Province,northwestern China,was estimated by means of two methods.One is on the basis of a simple physical model and short-term field measurements.The other comes from the combination of the barchan internal structure detected by ground-penetrating radar and optical/radiocarbon dating techniques.The upper limit of migration speed given by conventional C-14 dating is 3.42 m/yr.The optically stimulated luminescence dating indicates that the time-average migration speed of the studied barchan was 1.78 m/yr in 28 years prior to 2007.The physical estimation further suggests that the annual migration speed has increased in recent years.The migration speed of a typical barchan on the border of Minqin oasis,Gansu Province,northwestern China,was estimated by means of two methods.One is on the basis of a simple physical model and short-term field measurements.The other comes from the combination of the barchan internal structure detected by ground-penetrating radar and optical/radiocarbon dating techniques.The upper limit of migration speed given by conventional C-14 dating is 3.42 m/yr.The optically stimulated luminescence dating indicates that the time-average migration speed of the studied barchan was 1.78 m/yr in 28 years prior to 2007.The physical estimation further suggests that the annual migration speed has increased in recent years.

关 键 词：BARCHAN MIGRATION sand flux 

分 类 号：P931.3[天文地球—自然地理学]