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首页»科研成果» 2014
吴晓旭与合作者在AEOLIAN RESEARCH发表论文
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Deceleration efficiencies of shrub windbreaks in a wind tunnel Xiaoxu Wua, b, Xueyong Zoub , Na Zhoub, Chunlai Zhangb, Sha Shic a College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, PR China b State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, PR China c College of Life and Environment Sciences, Central University for Nationalities, Beijing 100081, PR China ABSTRACT Artemisia and Salix are dominant shrub species for windbreaks in arid areas of China, and they show similar features to shrubs in other arid areas of the world. We compared the mean velocity fields and shelter effects of two shrub windbreaks with different layouts. For a single plant of Artemisia, the higher the free airflow velocity is, the more the wind velocity around two sides of the plant increases. The velocity gradient around a single plant of Salix is smaller than that around an Artemisia plant due to the difference in the plant shapes. Seven new velocity zones in the horizontal direction appear when airflow passes through an Artemisia windbreak, including four deceleration zones and three acceleration zones. The mean velocity field that is affected by a Salix windbreak can be divided into a deceleration zone in the front, an acceleration zone above, a vortex zone behind and a restoration zone downwind of the vortex zone. Shelter effects of the shrub windbreaks vary with the wind velocity and are influenced by the construct of the windbreaks. Shrub windbreaks that have a complex construction have better shelter effects than simple ones. The shelter effects of plant windbreaks are also influenced by the growth features of the plants. Considering the plant characteristics and the shelter effects of Salix and Artemisia windbreaks, it is optimal to plant these two windbreaks together in a sand-control system. This research is intended to be useful for sand movement control in arid areas. KEYWORDS: Shrub windbreaks; Airflow field; Deceleration efficiency; Wind velocity gradient PUBLISHED BY: AEOLIAN RESEARCH, 2015, 16: 11-23 SOURCE: http://www.sciencedirect.com/science/article/pii/S1875963714000962 |
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