高立式格状沙障防风效益
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铁道部科技研究开发计划项目"拉日铁路工程建设关键技术研究:高原铁路生态环保关键技术研究"(2011G027-D);国家重点基础研究发展计划"青藏高原重大冻土工程的基础研究"(2012CB026105);国家自然科学基金重点项目"青藏铁路沙害形成机理及防治对策研究"(40930741)


Windproof Efficiency of Upright Checkerboard Sand-barriers
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    摘要:

    针对在风沙危害严重地区,半隐蔽式格状沙障容易遭沙埋,且其防护年限短等问题,提出了一种新型的防沙措施——高立式格状沙障(高1 m,长×宽=8 m×8 m),并对该沙障的防风效益进行了观测。结果表明:(1)高立式格状沙障对风速具有显著削弱作用;且越接近地表,风速被削弱的程度越大;沙障内5个观测点2 m高处风速平均减弱了33.0%,而0.2 m高处风速平均减弱了81.5%。(2)高立式格状沙障使沙障顶部高度(1 m)以下的风速廓线偏离对数曲线;沙障顶部以上风速和高度继续呈对数关系,且风速梯度明显大于对照点。(3)高立式格状沙障使地表粗糙度增大了44倍。

    Abstract:

    Semi-buried checkerboard sand-barriers were easy to be buried by sand and had short windproff duration. A novel sand prevention measure-upright checkerboard sand-barrier which was 1 m in height, 8 m in length and width was introduced, and its windproof efficiency was investigated. The results were as follows:(1) The barrier significantly reduced the incoming wind velocity, and the effect became more intensive approaching land surface. The averaged wind speed from five monitoring sites within the barrier showed a 33.0% reduction at 2 m high and 81.5% at 0.2 m high.(2) Wind velocity profiles within the barrier deviated from logarithmic curve below the height of the upright checkerboard sand-barrier(1 m). Above the barrier height, wind velocity profiles still followed the logarithm law, and wind velocity gradient was higher.(3) The average land surface roughness within the barrier region increased 44 times compared to the control point.

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庞营军,屈建军,谢胜波,肖建华,韩庆杰.高立式格状沙障防风效益[J].水土保持通报,2014,(5):11-14

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  • 收稿日期:2013-10-11
  • 最后修改日期:2013-10-29
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  • 在线发布日期: 2016-04-05
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