XU Jun,HAO Yu-guang,LIU Fang,et al.Wind-Sand Flow Structure and Its Variation under Different Surface Conditions in the Ulanbuh Desert[J].Research of Soil and Water Conservation,2013,20(04):95-98.
乌兰布和沙漠不同下垫面风沙流结构与变异特征
- Title:
- Wind-Sand Flow Structure and Its Variation under Different Surface Conditions in the Ulanbuh Desert
- 分类号:
- P931.3
- 摘要:
- 对乌兰布和沙漠流动、半固定、固定沙丘3种不同下垫面0—40 cm气流层内的风沙流结构的研究表明：（1）0—40 cm高度层，输沙量随风速的增加而增加；在不同的风速下，流动沙丘的总输沙量大于半固定沙丘，半固定沙丘的输沙量大于固定沙丘，且呈指数函数关系。（2）在同一风速下，0—40 cm高度层，三种不同下垫面的相对输沙量随高度的增加呈幂函数递减趋势。（3）随高度的增加，中沙粒基本呈递减趋势，细沙粒呈现递增趋势，但增幅因下垫面的不同而异。（4）三种不同下垫面近地表0—10 cm层风沙流结构特征数S值均小于3.8，而特征值λ均大于1，表明三种下垫面均处于风蚀或搬运状态。
- Abstract:
- Wind-Sand flow structure and its variation of 0—40 cm in the mobile sand dune, semifixed dune and fixed dune of Ulanbuh desert are investigated. The results show as the followings: (1) 0—40 cm vertical height， total windblown sand flux increases with the increase of wind speed; total windblown sand flux of mobile sand dune is greater than total windblown sand flux of semifixed dune and fixed dune at different wind speed, presents decreasing function of exponential relation; (2) under the same wind velocity, 0—40 cm vertical height， relative windblown sand fluxes of three types of surfaces present decreasing function of power relation with the increase of the height; (3) with the increase of the height, medium sand particles basically present decreasing trend, while fine sand particles increase, and the increase ranges are different under different surface conditions; (4) three types of different surface conditions near surface 0—10 cm layer of wind-sand flow structure features of S values are less than 3.8, and λ value is greater than 1, indicating that three types of different surface conditions are in a state of wind erosion or transfer.
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备注/Memo
收稿日期:2012-11-14;改回日期:2013-02-18。
基金项目:“十二五”科技支撑项目（2012BAD16B0103）
作者简介:徐军(1982-),男,内蒙人,学士学位,工程师,主要从事荒漠化研究。E-mail:xujunslzx@163.com
通讯作者:郝玉光(1963-),男,内蒙人,博士,研究员,主要从事水土保持与荒漠化研究。E-mail:hyuguang@163.com