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库布齐沙漠光伏电站内芦苇沙障的防风固沙效益
石涛, 蒙仲举, 崔向新, 党晓宏, 唐国栋, 贾瑞庭
内蒙古农业大学 沙漠治理学院/内蒙古自治区风沙物理与防沙治沙工程重点实验室, 内蒙古 呼和浩特 010011
摘要:
[目的] 研究光伏电站内芦苇沙障对风沙流的风速、输沙量及其沙粒分布的影响,为中国北方风沙区光伏电站沙害防治提供理论依据。[方法] 通过野外观测库布齐沙漠200 MWp光伏电站铺设芦苇沙障后的风速(20,50,100,200,310 cm)和近地表0—30 cm高度输沙量,分析风速廓线、地表粗糙度、摩阻风速、平均跃移高度、防风作用、固沙效益等指标的变化规律。[结果] ①芦苇沙障风速廓线呈对数函数分布,相关系数在0.99以上,芦苇沙障相对于裸沙地表粗糙度提高了3.47~3.79倍,摩阻风速增加了1.39~1.54倍,防风作用最大值出现在20 cm高度处,为21.72%。②总输沙量芦苇沙障仅为裸沙的6.95%,总体固沙效益为93.05%,裸沙90%以上的输沙量集中于0—8 cm范围,而芦苇沙障在此高度范围内输沙量占总输沙量的51.39%,芦苇沙障的风沙流结构有向上层移动的趋势。[结论] 铺设芦苇沙障降低了近地表风速,有效拦截了风沙流,达到了防风固沙目的,是沙区光伏电站有效的防护措施。
关键词:  平铺芦苇沙障  防风固沙  光伏电站  库布齐沙漠
DOI:10.13961/j.cnki.stbctb.2020.05.025
分类号:P931.3
基金项目:内蒙古自治区科技重大专项项目“重点区域荒漠化过程与生态修复研究与示范”(zdzx2018058-3)
Wind-prevention and Sand-fixing Benefits of Reed-Sand Barrier at Photovoltaic Plant in Hobq Desert
Shi Tao, Meng Zhongju, Cui Xiangxin, Dang Xiaohong, Tang Guodong, Jia Ruiting
Desert Science and Engineering College/Key Laboratory of Aeolian Sand Physics and Sand Control Engineering in Inner Mongolia, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010011, China
Abstract:
[Objective] The benefits of a reed-sand barrier in a photovoltaic plant with regard to wind velocity, transported sand volume, and transported sand diameter were studied in order to provide a theoretical basis for the prevention and control of sand damage caused to the 200 MWp photovoltaic plant in Hobq Desert, Northern China.[Methods] The wind speed after placing reed-sand barrier (20, 50, 100, 200, 310 cm) and sediment transport (at a height of 0—30 cm) near the surface of the photovoltaic plant were measured. Then, the trend of indicators such as the wind speed profile, surface roughness, friction speed, average jump height, wind prevention, and sand fixation benefit were analyzed.[Results] ① The wind speed profile of the reed-sand barrier followed a logarithmic increase function and the goodness of fit (R2) of the regression was > 0.99. The aerodynamic roughness and shear velocity above the reed-sand barrier were 3.47—3.79 times and 1.39—1.54 times higher, respectively, than those above bare sand. The wind break function at a height of 20 cm was the maximum (21.72%). ② The total sediment transport of the reed-sand barrier was only 6.95% of that of the bare sand, and the sand-fixing benefit was 93.05%. More than 90% of the total sand transport flux above the bare sand was distributed within a height of 0—8 cm, whereas only 51.39% of the total sand transport flux above the reed-sand barrier was distributed at this height. Therefore, the sand flux above the reed-sand barrier tended to move towards the high layer.[Conclusion] The reed-sand barrier acted as an effective windbreak and provided sand fixation by reducing the near-surface wind speed and intercepting sand transport. Thus, the reed-sand barrier is an effective protective measure for photovoltaic tracks in sandy areas.
Key words:  reed sand barrier  wind prevention and sand fixation  photovoltaic plant  Hobq Desert