摘要
该文结合实例河道运用环境流体力学代码(EFDC)模型研究滩地植被对河道水流的影响。模型通过建立植被阻力的经验公式,求解准三维水动力学方程,得到河道水流的水动力特征。通过模拟6组不同密度和高度的植被,并对流速和水位进行对比分析,结果表明:有植被存在时滩地水流显著减小。当植被密度600株/m2、高度为20cm时,滩地流速约为0.2m/s,此时河道水位相比无植被抬高0.2m左右;当植被高于1.0m时河道水位增加0.45m左右。研究结果对河道防洪和生态修复管理等有借鉴作用。
An environmental fluid mechanics code was used to calculate the hydrodynamics of compound channels in a vegetated floodplain. The vegetation drag was modeled with an empirical formula. Six cases were considered including different vegetation densities and vegetation heights. The results show that the vegetation decreases the floodplain velocity and raises the mean water level to some extent. When the density is 600 stems/m^2 and the height is 20 cm, the floodplain velocity decreases to 0.2 m/s and the water level increases 0.2 m. When the vegetation height is more than 1.0 m, the water level increases about 0.45 m. The results will help flood control and the building of ecological rivers.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第6期804-808,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(51039002)
