基于VFSMOD模型的沙棘-灌草植被过滤带拦沙效果模拟  

Modeling the sediment retention effect of the vegetative filter strip composed of seabuckthorn-shrub and herbaceous vegetation

作　　者：杨方社[1] 曹明明[1] 李怀恩[2] 杨晓东 苏淑珍[1] 张鸿敏[1] 

机构地区：[1]西北大学城市与环境学院,西安710069 [2]西安理工大学西北水资源与环境生态教育部重点实验室,西安710048 [3]鄂尔多斯市水土保持研究所,东胜017000

出　　处：《干旱区资源与环境》2017年第6期71-75,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(51279163);中国博士后科研基金项目(2012M512022);陕西省自然基金项目(2010JQ5003)资助

摘　　要：植被过滤带是拦截泥沙与地表径流的有效生物措施,其规划设计与众多因素有关。文中首先对VFSMOD(Vegetative Filter Strips Model)模型进行了简介,然后应用VFSMOD模型,主要对位于内蒙古砒砂岩典型地区-准格尔旗境内东一支沟小流域的沙棘-灌草植被过滤带对地表径流中泥沙的拦截效果进行了模拟。结果表明:所研究的植被过滤带带长为20~30m时,泥沙拦截效果最佳;植被过滤带的带宽为4~4.5m时,泥沙拦截效果较好;株距应设定在5~15cm之间较好,此时泥沙拦截率超过65.9%;泥沙拦截率与坡度呈负相关,即随着坡度的增加泥沙拦截率逐渐降低;糙率对泥沙拦截率影响较小,随着糙率的增大,泥沙拦截率逐渐趋于稳定值。本研究可为在砒砂岩地区,以沙棘植物为主体的混合植被过滤带的规划与设计提供理论依据。The vegetative filter strip （VFS） is an effective bio - measure for trapping sediment and overland run- off, the design and planning of which is related to various factors. In this research, the VFSMOD （ Vegetative Filter Strips Model） was firstly introduced and used to simulate the sediment retention effect of the seabuckthorn and herbaceous vegetation filter strip on overland runoff. The studied VFS is located on the small catchment of the east - one branch gully of Jngar county of Inner Mongolia autonomous region, a typical Pisha sandstone zone. The results showed： （i） The sediment retention effect of the VFS is optimal when its length ranged from 20 - 30m. （ii）The sediment retention effect of the VFS is better when its width ranged from 4 -4.5m. （iii）When the spacing between plants is set between 5 - 15cm, the corresponding sediment retention effect can be over 65. 9%. （iv）The sediment retention effect correlates negatively to slope, that is, the sediment retention effect is progressively decreasing with increasing slope. （v） The effect of the roughness on the trapping sediment is less, and the trapping sediment rate tends gradually to be a stable value with increasing roughness. This research can provide theoretical proof for the design and planning of the mixing vegetation filter strip dominated by the seabuckthorn within the Pisha sandstone area.

关 键 词：沙棘-灌草植被过滤带 VFSMOD模型 地表径流 拦沙效果 模拟 

分 类 号：TH815[机械工程—仪器科学与技术] TV135.2[机械工程—精密仪器及机械]