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通过鄂尔多斯市伊金霍洛旗纳林陶亥镇境内毛乌素沙地边缘沙区的高立式沙柳沙障风速野外观测,利用Surfer(8.8)软件绘制了高立式沙柳沙障体系内外的风速流场图,分析高立式沙柳沙障的防风效益。结果表明:当旷野风速大于起沙风速时,复式带状高立式沙柳沙障体系内外风速变化较明显,防沙带2 m高处风速呈现带前增强,带内平缓,带后减弱的趋势;而防沙带0.5 m高处风速带内更趋向于平缓、稳定。此外,对沙柳沙障的粗糙度进行了研究。结果表明:障前2~12H(障高)范围内下垫面粗糙度变化不大;障间粗糙度明显增大;障后2~12H处的粗糙度比障间粗糙度降低了33.3%,但还是高于旷野对照点粗糙度,为旷野粗糙度的29倍。
Through the field observation of the high-speed Salix psammophila sandstorm in the sand area at the edge of Mu Us Sandy Land in the town of Nakulin, Ninhualuochi, Erdos, the internal and external Wind speed flow chart to analyze the windbreaking benefit of high vertical salix sand barrier. The results show that when the wind speed in the wilderness is higher than the wind speed, the wind speed inside and outside of the system is obviously changed. The wind speed at 2 m height of the sand belt shows an increase in frontal band, Trend; however, the wind speed zone at 0.5 m height in the sand control zone tends to be more gentle and stable. In addition, the roughness of salix sand barrier was studied. The results show that the roughness of the underlying surface does not change much in the range of 2 ~ 12H (barrier height) before the barrier and the roughness of the barrier increases obviously; the roughness at the angle of 2 ~ 12H after the barrier reduces the roughness of the barrier by 33.3% But still higher than the wilderness control point roughness, 29 times the wilderness roughness.