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Scientia Silvae Sinicae ›› 2011, Vol. 47 ›› Issue (2): 95-102.doi: 10.11707/j.1001-7488.20110214

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Windbreak Effects and Wind Velocity Flow Field of Low Density Forest with Two-Line-One-Belt Distribution Patterns of Single-Belt Scheme

Yang Wenbin1, Wang Jingying2, Dong Huilong3,1, Wang Linhe3, Zhang Guosheng3, Lu Qi1, Zhao Aiguo4   

  1. 1. Combating Desertification Research Institute,CAF Key Lab. for Forest Tree Breeding of State Forestry Admimistration National Research and Development Centre for Combating Desertification of China Beijing 100091;2. Inner Mongolia Academy of Forestry Science Huhhot 010010;3. Ecology College,Inner Mongolia University of Agriculture Huhhot 010010;4. Cold and Arid Regions Environmental and Engineering Research Institute, CAS Lanzhou 730000
  • Received:2009-09-27 Revised:2010-12-06 Online:2011-02-25 Published:2011-02-25

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Abstract:

In order to compare the wind-preventing effect of three patterns of wind flow field, horizontal and vertical wind speed changes was studied under the condition of tunnel, with the "two-row in one-belt pattern" in arbor sand-fixing forest and with the coverage of 20% and 25%, and the experimental wind velocity was set 10 and 15 m ·s-1,respectively.The result indicated that:a complex wind flow field formed under four centimeters in height in three kinds of configuration mode,the field structure was composed of the wind shadow and the wind speed acceleration areas. The "two-row in one-belt pattern"with the coverage of 25% was better than that with the coverage of 20%.The change of wind speed showed the same pattern at different heights in the three different patterns. They were able to be divided into three layers—micro-level changes(1.54H and 2H),significant change in layer(0.46H and 0.92H),and stable changes in layer(0.06~0.12H).The effect of reducing wind speed of three patterns showed that the windbreak effect of the D=4H(H is the spacing interval between the forest belts),L=4 cm(L is row spacing)was better than D=5H,L=0.08 m and coverage of 20%(D=5H,L=0.04 m),and the last two modes had the same effect.

Key words: wind tunnel, two-line-one-belt distribution pattern (TLOP), wind velocity flow field, windbreak effect

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