,zero-plane displacement (d) and roughness length (z0 ),were evaluated,with their affecting factors analyzed.
结果表明:该方法可较好地估算芦苇湿地的空气动力学参数;芦苇湿地零平面位移(d)和粗糙度(z0)的季节变化均呈先增后减的单峰曲线变化。
Based on logarithm law of wind profile under neutral stratification,zero-plane displacement d and roughness length z 0 of the mixed forest of broad-leaved and Korean-pine in Changbai Mountain were calculated with Newton iteration according to the 16 months profile measurements of wind speed,air temperature,humidity and pressure.
根据长白山阔叶红松林气象观测塔上 16个月的风速、温度、湿度及气压的连续观测资料 ,根据中性层结条件下风速随高度的对数变化规律 ,利用廓线法中的牛顿迭代法计算了该森林的零平面位移d和粗糙度z0 ,结果表明 ,d和z0 均存在着较明显的季节变化 ,在生长季d较大 ,z0 较小 ,而非生长季恰好相反 ,标准化的零平面位移d/h和粗糙度z0 /h在生长季和非生长季平均分别为 0 86 7,0 76 4和 4 4 7× 10 -2 ,3 5 9× 10 -2 。
Under neutral stratification the parameters of wind speed profile (zero plane displacement d,roughness length Z 0 and friction velocity U *) above forest with different canopy density C are calculated by approximating method.
结果表明，风速廓线参数（零平面位移ｄ、林冠表面粗糙度Ｚ０、动力速度Ｕ）随郁闭度Ｃ的变化而改变，ｄ随Ｃ的增大而增大，二者关系可由对数函数表示：ｄ＝（Ｈ／ａ）ｌｎ（Ｃ／Ｃ０）。
We find the aerodynamical roughness length and the zero plane displacement is increasing with the development of the urbanization in recent decade years.
结果表明 ,空气动力学粗糙度和零平面位移总体是逐年递增的。
The aerodynamic roughnees length Z 0 , the zero plane displacement d , the momentum drag coefficient C D, water and heat drag coefficient C H are calculated by using turbulence data and wind, temperature profile data observed in Changbai Mountain forest.
使用长白山阔叶红松林的风、温、湿梯度资料和超声风温仪测量的湍流资料，计算了长白山森林空气动力学粗糙度Ｚ０，零平面位移ｄ、冠层上动量曳力系数ＣＤ及水热曳力系数ＣＨ，并对ｄ和Ｚ０的计算方法做了误差分析。
