Wind Flow Field and Windproof Efficiency of Shelterbelt in Different Width

doi:10.7522/j.issn.1000-694X.2017.00080

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (5): 936-944.DOI: 10.7522/j.issn.1000-694X.2017.00080

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Wind Flow Field and Windproof Efficiency of Shelterbelt in Different Width

Li Xuelin¹, Ma Yanjun¹, Ma Rui¹, Zhang Yinghua², Tang Weidong², Yang Jinjie²

1. Forestry College, Gansu Agricultural University, Lanzhou 730070, China;
2. State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Gansu Desert Control Research Institute, Lanzhou 730070, China

Received:2017-07-26 Revised:2017-10-10 Online:2018-09-20 Published:2018-11-03

Abstract

Abstract: The width of shelterbelt is the basic parameter to be considered at building the windbreak and sandbreak forest. It has important directive significance to study the protective effect of different width of shelterbelt on the configuration and construction of the windbreak and sandbreak forest. In order to compare the wind speed field, wind speed acceleration and windbreak effect of shelterbelt in different width. We studied the change of the vertical space wind velocities in the condition of 7, 10 and 15 m·s^-1 under the wind tunnel. The result showed that:(1) Four kinds of shelterbelt have similarity in the flow field structure and the change of vertical wind speed. It was found that four kinds of forest belt formed flow field structure which was combined by the high wind speed area and the wind shadow; We divided the vertical space into three layers according to the change of vertical wind speed:upper change layer (30-60 cm, it was least affected by the forest), the middle change layer (5-20 cm, it was the greatest affected by the forest) and near bed surface change layer (1-3 cm). (2) The acceleration rate of wind velocity decreased with the increase of the width of shelterbelt. It is typeⅠ > typeⅡ > typeⅢ > typeⅣ. (3) The windbreak effect of the four kinds of forest belts is the same typeⅠand typeⅡ, the same typeⅢ and typeⅣ. The windbreak effect of the latter two kinds of forest belts was higher than the former two kinds of forest belts. The windbreak efficiency of the four forest belts decreased with the increase of wind speed.

Key words: wind tunnel test, shelterbelt width, flow field structure, wind speed acceleration, windbreak efficiency

CLC Number:

X169

Li Xuelin, Ma Yanjun, Ma Rui, Zhang Yinghua, Tang Weidong, Yang Jinjie. Wind Flow Field and Windproof Efficiency of Shelterbelt in Different Width[J]. Journal of Desert Research, 2018, 38(5): 936-944.

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Wind Flow Field and Windproof Efficiency of Shelterbelt in Different Width

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