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中国沙漠 ›› 1993, Vol. 13 ›› Issue (3): 25-32.

• 论文 • 上一篇    下一篇

半湿润地区风沙流结构的定量研究——以豫北沙地为例

韩致文   

  1. 中国科学院兰州沙漠研究所
  • 出版日期:1993-09-20 发布日期:1993-09-20

Quantitative Study on Wind-Sand Flow Structure in Semihumid Zone-Taking Sandy Land in Northern Henan as an Example

Han Zhiwen   

  1. Institute of Desert Research, Academia Sinica, Lanzhuo
  • Online:1993-09-20 Published:1993-09-20

摘要: 暖温带半湿润地区豫北沙地相同下垫面不同风速下0-20cm高度内总输沙量随2米高处风速增大而增加:Q0-20=7.488002-3.045697V+0.309797V2;输沙率QL随2米高处风速增大而以QL=3.743841-1.5228816V+0.153897V2,函数形式增加。上层(4-20cm)、中层(2-4cm)、下层(0-2cm)输沙量随2米高处风速增大而以不同函数形式增加,各层占输沙量百分数随2米高风速增大分别成增加、波动、减小趋势;各层输沙量随总输沙量增加而以不同函数形式增大。观测结果表明:半湿润地区豫北沙地0-20cm高度内风沙流中10%输沙量在4-7cm范围内随风速大小变动。

关键词: 半湿润区, 风沙流结构, 拟合模式

Abstract: On the sandy land in northern Henan of warm-temperate semihumid zone,the total rates of sand transport at 0-20cm above gronud surface increase with increasing wind velocity if they have same underlying surfaces. The sand trasport rates of upper layer (4-20cm),middle layer(2-4cm) and lower layer (0-2cm) respectively increase with the increasing wind velocity at 2m above ground surface in different function forms, while the percentage of sand transport rates of each layer respectively exhibits a increasing, fluctuating and decreasing trends. Observation results show that on the sandy land in northern Henan of semihumid zone, 10 percent of sand trasport rate at 0-20cm above-ground surface are distributed in 4-7cm layer.