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| A Preliminary Study on Sand Drift Activities and its Control in Beijing Area |
| Beijing Sand Drift Research Group of the Institute of Desert Research, Acade mia Sinica |
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Abstract Based on two-year field survey of the sand drift,semi-fixed site observation,wind tunnel experiments and analytic research of the related regional information, it has reached the following conclusions:The problem on the sand drift belongs to one of the most serious ones on Beijing regional environment. Its frequency is no less than that of Bashang Area in Hebei Province and Houshan area in the Nei Mongol both of these two areas are located in semi-arid zone. It is in spring that such sand drift activities are found every where. The days with sand blowing in winter and spring occupy more than 80% of the yearly sand drift activities. The weather influenced by sand drift varies greatly from year to year,for example,it was most frequent in 1950s and least in 1960s, and there was a rise in early 1970s, and gradually decreased from the mid-1970s to the mid-1980s, Besides the natural foctors, the formation of sand drift activities and their increase or decrease are closely related to the variations of vegetations, soil texture and other factors caused by human activities.The sand drift activities not only pollute the atmosphere but also destroy land resource,the area seriously destroyed by sand-blowing goes up to 228000 ha, accounting for 35.6% of the total plain area, of which sandy ground surface covers an area of 90700 ha,, making up 14.2% of the total plain area, the largest distributive area is in alluvial plain of the Yongding River.Our study has proved that the sands in Beijing Region originate mainly from local places,i. e, "local origin".Therefore, the control of sand drift should be focused upon the local region,especially, the rehabilitation of the desertified lands has radically significance both in eliminating sand drift damages and improving our capital environment.
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Published: 20 September 1987
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1987, Vol. 7 
