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| 1 | 库布齐沙漠南缘抛物线形沙丘表面风速与输沙率的变异显示文摘以库布齐沙漠南缘典型抛物线形沙丘为研究对象,选取3个沙丘前端活动区的纵断面和一个贯穿两翼及翼间平地的横断面,同步观测各个断面的风速与输沙率,讨论抛物线形沙丘表面形态-动力学过程。结果显示,沙丘前端活动区3个纵断面的风速和输沙率遵循一般变化规律,即沿迎风坡上升逐渐增加,至丘顶及附近达到最大,并在背风侧降低;二者在3个纵断面上的变化趋势一致,但具体变化形式不同,沙丘表面动力与输沙过程存在较大的空间异质性。沙丘两翼具有纵向沙丘的动力学性质,翼体两侧风速和输沙率具有对称性。该沙丘沙源匮缺,前端活动区主要依靠两翼内侧侵蚀提供沙源。受沙丘形状和植被等因素影响,坡脚及坡下部风速与输沙率之间没有相关性,因此简单的风速放大率和输沙率变化程度无法准确揭示该类型沙丘表面复杂的形态-动力学关系。 | 陶彬彬 哈斯额尔敦 乌格特茉勒 管超 | 2015 | 中国沙漠2015，35，6： | 6 |
| 2 | Environmental Conditions of Barchan Dune and Barchan Chain-A Case Study from the Hexi Desert Area of Gansu显示文摘[Objective] The paper was to discuss why the top of tall barchan dunes and barchan chains widespread in single prevailing wind area had not been leveled by wind erosion. [Method] Based on the preliminary survey of distribution status,the morphological characteristics and environmental conditions of barchan dunes and barchan chains in Hexi desert area of Gansu were investigated in details. The significance of difference between samples and significance of correlation between indicators were examined via variance test. [Result] Barchan dunes and barchan chains in Hexi desert area of Gansu distributed at the leeward direction of desert fringe,generally in patch distribution. The distribution area was gravelly beach or cohesive gravel beach,with broader dune slack; winds in distribution area of barchan dunes and barchan chains blew obviously from one direction,while winds at other directions were light or occasionally strong but with low frequency;the barchan dune in the desert fringe of Hexi desert area of Gansu was relatively tall,while barchan chain was even more taller and larger. Coincidence or separation of the dune peak and the sand ridge might be related to distribution frequency of dominant prevailing wind or wind at opposite direction and the observation seasons.[Conclusion]Studying top stability of barchan dune has an important academic value in revealing blowing sand movement rule at desert fringe,invasion of sand flow,and expansion of desert. | Chang Zhaofeng Wang Qiangqiang Zhang Jianhui Xi Junqiang Wang Qi Zhang Dekui Tang Jinnian Zhang Huiwen | 2015 | Animal Husbandry and Feed Science2015，7，6： | 2 |
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