应用生态学报2024，Vol.35Issue(3)：577-586,10.DOI:10.13287/j.1001-9332.202403.026
通用风速廓线模型在山区森林的适用性
Applicability of the generalized wind profile model over mountainous forests
摘要
Abstract
The analytical equation based on Monin-Obukhov(M-O)similarity theory(i.e.,wind profile equation)has been adopted since 1970s for using in the prediction of wind vertical profile over flat terrains,which is mature and accurate.However,its applicability over complex terrains remains unknown.This applicability signifies the accuracy of the estimations of aerodynamic parameters for the boundary layer of non-flat terrain,such as zero-dis-placement height(d)and aerodynamic roughness length(z0),which will determine the accuracy of frequency cor-rection and source area analysis in calculating carbon,water,and trace gas fluxes based on vorticity covariance method.Therefore,the validation of wind profile model in non-flat terrain is the first step to test whether the flux model needs improvement.We measured three-dimensional wind speed data by using the Ker Towers(three towers in a watershed)at Qingyuan Forest CERN in the Mountainous Region of east Liaoning Province,and compared them with data from Panjin Agricultural Station in the Liaohe Plain,to evaluate the applicability of a generalized wind profile model based on the Monin-Obukhov similarity theory on non-flat terrain.The results showed that the generalized wind profile model could not predict wind speeds accurately of three flux towers separately located in different sites,indicating that wind profile model was not suitable for predicting wind speeds in complex terrains.In the leaf-off and leaf-on periods,the coefficient of determination(R2)between observed and predicted wind speeds ranged from 0.12 to 0.30.Compared to measured values,the standard error of the predicted wind speeds was high up to 2 m·s-1.The predicted wind speeds were high as twice as field-measured wind speed,indicating substantial overestimation.Nevertheless,this model correctly predicted wind speeds in flat agricultural landscape in Panjin Agricultural Station.The R2 between observed wind speeds and predicted wind speed ranged from 0.90 to 0.93.The standard error between observed and predicted values was only 0.5 m·s-1.Results of the F-test showed that the root-mean-square error of the observed and predicted wind speeds in each secondary forest complex terrain was much greater than that in flat agricultural landscape.Terrain was the primary factor affecting the applicability of wind profile model,followed by seasonality(leaf or leafless canopy).The wind profile model was not applicable to the boundary-layer flows over forest canopies in complex terrains,because the d was underestimated or both the d and z0 were underestimated,resulting in inaccurate estimation of aerodynamic height.关键词
莫宁-奥布霍夫相似理论/粗糙度长度/零平面位移/适用性Key words
Monin-Obukhov similarity theory/roughness length/zero-displacement height/applicability引用本文复制引用
庞云超,朱教君,高添,李秀芬,肇同斌,王兴昌,李荣平,于丰源,曲胜麟,滕德雄..通用风速廓线模型在山区森林的适用性[J].应用生态学报,2024,35(3):577-586,10.基金项目
本文由国家自然科学基金项目(32192435)和中国科学院沈阳应用生态研究所自主部署重大项目(IAEMP202201)资助. （32192435）
