三维树冠的结构参数与阻力特性的关系  

Relationship between Structural Parameters and Resistance Characteristics of Three-Dimensional Canopy

作　　者：宋明辉 付海明[1] SONG Minghui;FU Haiming(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《东华大学学报（自然科学版）》2020年第3期450-456,共7页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金资助项目(41371445,51178094)。

摘　　要：为深入研究树冠结构形态参数对树冠流动阻力的影响,采用风洞试验对八角金盘、构树、女贞、木芙蓉及梧桐5种树冠结构差异较大的典型树种进行研究,探讨树冠层结构参数中填充率与叶面积指数、光学孔隙率、分形维数之间的关系。采用多元回归分析法,给出5种树冠流动阻力与光学孔隙率和风速的关系表达式。结果表明:叶面积指数与填充率呈线性关系,光学孔隙率、分形维数均与填充率呈幂指数函数关系;树冠流动阻力与光学孔隙率和风速呈非线性关系。In order to deeply study the influence of canopy structure morphological parameters on flow resistance,the wind tunnel experiment was used to study the flow resistance of five typical morphological tree species including fatsia japonica,paper mulberry tree,ligustrum lucidum,cottonrose hibiscus and firmiana simplex.Correlation between the solid volume fraction(SVF)of canopy layer structure and the leaf area index(LAI),the optical porosity(OP),and the fractal dimension(FD)were investigated.Multivariate regression analysis was used to deduce the expressions of multivariate relationship between flow resistance and optical void ratio/wind speed.The results show that LAI is linear with SVF,while OP and FD have a exponential function relationship with SVF.The canopy flow resistance is nonlinearly related to OP and wind speed.

关 键 词：树冠 阻力系数 填充率 光学孔隙率 

分 类 号：X513[环境科学与工程—环境工程] S731.2[农业科学—林学]