Study on the Wind-Sand Flow Structure near the Ground during a Sandstorm in Typical Desertification Grassland

Abstract:

Under the influence of the properties of underlying surface, the wind-sand flow structure near the ground is different when the sandstorm occurs in different areas. In this paper, in order to explore the structure features of the wind-sand flow near the ground during a sandstorm in desertification grassland, Zhao He observation station at Inner Mongolia, China, in desertification grassland has been selected as an example. According to data measured by anemometer and sand collector，a comparative analysis on the relative sediment concentrations for different height in eight directions during the sandstorm on April 29-30，2011, and study the pattern of wind-sand flow structure have been done. The result shows that the first-rank curve fitting of wind-sand flow structure is exponential function under the northwest (main direction of the sandstorm), and the sediment discharge were increased with the height increase. The wind-drift sand flows are mainly suspension in prevailing wind direction. In the southeast, the opposite to the prevailing wind direction, the first-rank curve fitting of wind-sand flow structure is power function that showed sediment discharge were decreased with height increase, and saltation is the main wind-drift sand flows movement pathway. In the rest directions, weak correlations between sediment discharge and height during a sandstorm have been found. The closer directions to the prevailing wind direction, the more relative sediment discharge in the elevations above 30-35cm

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 4568-4573
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.4568
• Online since: May 2012
• Authors: Jing Wang, Yi Fang, Run Mei Hao, Rui Ping Zhou, Dan Dan Zhou, Chun Xing Hai
• Keywords: Desertification Grassland, Sandstorm, Wind-Sand Flow Structure

References

[1] A. N. Znamensk,Ya,Y.H:Experimental study of the process of sand erosion of sand erosion and sand prevention problem(Yang Yuhua and Zhu Zhenda proofreading).M. Beijing Science press, (1960),pp.8-52.

[2] Bagnold R A:The Physics of blown sand and desertdunes London: Methuen & Co(1941).

[3] Dong,Z.B:Journal of Desert Research,25(3)(2005),pp.293-305(In Chinese).

[4] Li,Z.S., &Ni,J.R: Journal of Arid Land Resources and Environment,12(3) (1998),P.89-97(In Chinese).

[5] Zhu,Z.D:Application of experimental methods study some characteristics of formation process of sand landscape.M.Sand control research(No.4) .Beijing Science press, (1962),P.49-61(In Chinese).

[6] Zou X.Y., &. Dong,G.R: Advances in earth science,8(6) (1993),P.44-49(In Chinese).

[7] Dong,Z., Liu,X., Wang,H., et al: Geomorphology,49: (2002),P.219-230(In Chinese).

[8] Feng D.J., Ni,J.R., Li, Z.S: Acta Geographica Sinica, 62 (11) (2007),P.1194-1203(In Chinese).

[9] Fu, Q,L., Sha,Q.A: Acta Sedimentologica Sinica,12 (1) (1994),P.98-104(In Chinese).

[10] Ha.S:Chinese Science Bulletin, 49(11) (2004),P.1099-1104(In Chinese).

[11] Li,H.Q., Ai,N.S:Journal of Desert Research ,13(1) (1993),P.11-20(In Chinese).

[12] Li, Z.S., Zhang, Q.F. Journal of Desert Research,26(2): (2006),P.199-193(In Chinese).

[13] Ma,S.W.(1988).Study on Structure of wind-Sand Flow.J. Journal of Desert Research, 8(3):8-22(In Chinese).

[14] Ni,J.R., Li,Z.S. Mendoza C. : Geomorphology,49: ( 2002),P.205-218.

[15] Yin,Y.S: Journal of Desert Research,9(4) (1989),P.27-6(In Chinese).

[16] Wu,Z.,Ling,Y.Q:Elementary study on Some laws of wind-sand active and prevent problem of wind-sand hazard .A.Sand control research(No.4) .Beijing Science press (1965),P. 7-14(In Chinese).

[17] Zheng X.J.,He,L.H., Wu,J.J:Chinese Science Bulletin, 48(14) ( 2003),P.493-1498(In Chinese).