中性大气稳定度条件下林冠湍流特征模拟  

Turbulent characteristics in forest canopy under atmospheric neutral condition

作　　者：刁一伟[1,2] 关德新[1] 金昌杰[1] 王安志[1] 裴铁璠[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]南京信息工程大学大气物理学院,南京210044

出　　处：《应用生态学报》2010年第2期294-299,共6页Chinese Journal of Applied Ecology

基　　金：国家基础研究发展计划重点项目(2009CB421101);中国科学院知识创新工程重要方向项目(KZCX2-YW-Q06-2-1);林业公益性行业科研专项(200804001)资助

摘　　要：基于欧拉二阶闭合模型,利用2003年长白山阔叶红松林微气象资料,计算并分析了长白山阔叶红松林林冠内/上的湍流特征.结果表明:模拟得到的平均风速廓线与实测值吻合;雷诺应力在林内衰减较大,而近地面处几乎没有动量传输贡献;湍流强度、速度方差和速度偏度在林冠与大气交界面处达到最大,同时剪切也达到最强;速度偏度越大,则湍流间歇性越强,并且向下的湍涡越难穿透林冠内部;林内深处的大部分湍流能量不是由局地产生,而来自于林上.Based on the micrometeorological data of broad-leaved Korean pine forest in Changbai Mountain in 2003,a second-order closure model was employed to calculate and analyze the turbulent characteristics within and above the canopy of the forest.The calculated mean wind profile was coincident with the measured one.The Reynolds stress within the forest was significantly attenuated.The turbulent strength,velocity flux,and skew were the largest at forest-atmosphere interface,as well the wind shear.With the increase of velocity skew,the turbulent intermittence became more significant,and the downward turbulent eddy within the canopy was limited.Most of the turbulent deeply within the forest canopy was produced by the non-local contributions above the canopy.

关 键 词：二阶闭合模型 森林冠层 湍流特征 

分 类 号：P404[天文地球—大气科学及气象学]