The influence of structural characteristics of single plant canopy were analyzed in different wind speed and ambient temperature by wind tunnel experiment.According to the characteristics of canopy structure,the related structural parameters of the leaf area index and the filling ratio were proposed.Through regression analysis of the influence of canopy structure parameters on the thermal environment,the equations of the relation between the coefficient of canopy temperature drop and wind speed and leaf area index were put forward.To verify the adaptability of the correlation,a variety of tree species were tested.The results show that the canopy has significant cooling effect on the surrounding thermal environment,and the canopy temperature drop coefficient shows a certain regularity with the structural parameters,wind speed and ambient temperature.The cooling effect is different for the different size of the canopy leaves.The proposed canopy temperature drop correlation has certain applicability,but it is necessary to make some corrections to predict the cooling effect of different canopies.%通过风洞试验,分析了不同风速和环境温度下单一品种树冠结构特性对环境温度的影响.针对树冠结构特性提出相关结构参数(叶面积指数、填充率),讨论了其对周围热环境的影响规律,提出了树冠温度下降系数与风速、叶面积指数的关联表达式,并采用多种树冠的测试数据对该关联式的适应性进行对比验证.结果表明:树冠对周围空气热环境有显著的降温效果,树冠温度下降系数与其结构参数、风速和环境温度呈一定规律;叶片尺寸不同的树冠,其降温效果也不同;提出的树冠温降关联式具有一定的适用性,但预测不同树冠的降温效仍需进行必要的修正.
展开▼
