摘要
沙棘柔性坝是在砒砂岩地区沟道拦截泥沙的一种有效生物措施。本文通过野外试验,研究了沙棘柔性坝对水流的阻滞作用,探讨了沙棘柔性坝各种植参数对沟道水流水位及流速分布的影响。试验结果表明,沙棘柔性坝的存在增大了沟床的糙率及水流的阻力,可在坝前形成一定长度的壅水段,减小流速和水流的剪切力,有利于泥沙淤积;不同的种植参数(种植方式、种植密度和柔性坝坝长等)对水流的阻滞作用不同,对水流的阻滞作用影响最大的种植因子是柔性坝的坝长,其次是植物密度和种植方式。这些结论在砒砂岩地区沟道治理过程中,对于沙棘柔性坝生物工程的栽植可提供定性的指导与参考,但是沙棘植物柔性坝生物工程布置的具体定量数据还需进一步的探讨与研究。
The seabuckthorn flexible dam is a biology measure which can effectively confine sediment in gully channel in the soft rock region. Based on field experiment, the effects of the seabuckthorn flexible dam on water flow resistance are studied, and the effects of different planting parameters of the seabuckthorn flexible dam on water level and flow velocity in gully channel are discussed. The results show that： （1） The seabuckthorn flexible dam can augment the roughness of gully bed and increase the resistance of water flow in gully channel; （2） as a result of formed backwater length, the velocity and shear force of water flow in gully are reduced, thereby, sediment can easily be deposited in gully channel. （3） The effects of different planting parameters （ e. g. plant type, plant density, the length of plant flexible dam, etc. ） on the resistance of water flow in gully channel are quite different, and the most striking effect factor on the resistance of water flow is the flexible dam length, and the next is the plant density and plant arrangement method. The conclusions can provide some qualitative guidance and reference for the biology project of seabuckthorn flexible dam planting during the course of controlling gully channel erosion in the soft rock region. However, the real quantitative data of the layout plan of seabuckthorn plant flexible dam would be further discussed.
出处
《水力发电学报》
EI
CSCD
北大核心
2009年第1期124-129,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金项目(50479067)
西北大学211自然科学基金项目(05NW56)
关键词
河流泥沙工程学
水流影响
分析
沙棘柔性坝
种植参数
水流阻力
野外试验
river sedimentation engineering
effect of water flow
analysis
seabuckthorn flexible dam
planting parameter
water flow resistance
field experiment
