力学与实践 ›› 2016, Vol. 38 ›› Issue (3): 283-289.DOI: 10.6052/1000-0879-15-345

• 应用研究 • 上一篇    下一篇

不同高度柔性植被对坡面流水动力特性的影响

孙菊英, 张璐, 赵璐, 潘雪倩, 雷孝章   

  1. 四川大学水力学与山区河流开发保护国家重点实验室, 成都 610065
  • 收稿日期:2015-12-22 修回日期:2016-02-04 出版日期:2016-06-15 发布日期:2016-06-20
  • 通讯作者: 孙菊英,硕士研究生,研究方向为水力学及河流动力学.E-mail:juyingsun@163.com;雷孝章,副教授,博士,研究方向为河流泥沙与水土保持.E-mail:3141293368@qq.com

EXPERIMENTAL STUDY OF THE EFFECTS OF DIFFERENT HEIGHT FLEXIBLE VEGETATION ON HYDRAULIC CHARACTERISTICS OF OVERLAND FLOW

SUN Juying, ZHANG Lu, ZHAO Lu, PAN Xueqian, LEI Xiaozhang   

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
  • Received:2015-12-22 Revised:2016-02-04 Online:2016-06-15 Published:2016-06-20

摘要:

基于系列坡面流试验,研究了柔性植被的高度(4 cm, 8 cm 和15 cm) 对坡面流水动力特性的影响. 研究表明:覆盖率相同时,4 cm 植被阻水效果最好,15cm 最差,而该差异随着坡度增大而减小. 4 cm 和8 cm 植被覆盖时,水流阻力系数随雷诺数增加先减小后增加,这是由于雷诺数较小时水流阻力主要以床面阻力为主,雷诺增大时主要以植被阻力为主. 另外,通过染色剂法测得光滑床面平均流速修正系数为0.2~0.4,有植被覆盖床面为0.4~0.8,且修正系数随平均流速增大而增大.

关键词:

坡面流|柔性植被|植被高度|阻力系数

Abstract:

A series of overland flow experiments are conducted, focusing on the effects of the different height flexible vegetation on the hydraulic characteristics of the overland flow. Experimental results show that the 4 cm vegetation shows the best effect on the overland flow while the 15 cm vegetation shows the least effect. The difference of the effects reduces with the increase of the slope. With the same coverage rate, the flow resistance increases and then decreases with the increase of the Reynold's number. That is because the main flow resistance is the bed resistance in case of a small Reynold's number while the vegetation resistance prevails in case of a large Reynold's number. Besides, the revised coefficient ranges from 0.2 to 0.4 on smooth slopes while 0.4 to 0.8 on vegetation slopes, and the revised coefficient increases with the increase of the averaged velocity.

Key words:

overland flow|flexible vegetation|the height of vegetation|drag coefficients

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