551.551: 551.581.43 On the Turbulent Structure of Airflow within Crop Canopies
551.551: 551.581.43 On the Turbulent Structure of Airflow within Crop Canopies
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551.551：551.581.43 关于作物冠层内气流的湍流结构
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
By E. Inoue
中科院分区：
文献类型：
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作者：
By E. Inoue
本文根据作物冠层内指数风速廓线的观测资料，从理论和观测两方面研究了冠层涡旋的几何和动力学特征。在冠层内，冠层涡旋的长度、宽度和深度与高度成常数，并与（H-d）成正比，其中H为作物高度，d为冠层上方对数流速剖面的零平面位移。冠层涡动的三个方向的速度也被认为是下降的指数形式的exp {-a（1-Z/H）}，其中Z是从作物高度平面以下的地面测量的高度。作物冠层内和上方的指数和对数速度分布之间的联系，以及冠层涡和HONAMI涡，引起波动植物现象（HONAMI），具体处理。本文将湍流的惯性子区理论应用于作物冠层涡旋，提出了一种计算作物冠层内垂直输送系数的方法，并用早期观测资料进行了检验。
Taking the observational evidences of the exponential wind velocity profile within crop canopies into account, the geometrical and dynamical characteristics of canopy-eddies have been investigated from both theoretical and observational points of view. The length, width and depth of canopy-eddy have been suggested to be constant with height within the canopy layer and to be in proportion to (H-d), where H is the crop height and d the zero-plane displacement derived from the logarithmic velocity profile above canopies. Velocities in three directions of canopy-eddy are also suggested to decrease downward following the exponential form of exp {-a(1-Z/H)}, where Z is the height measured from the ground surface beneath the crop height plane. The connections between the exponential and the logarithmic velocity profiles within and above crop canopies and those between the canopy-eddy and the HONAMI-eddy, which causes waving-plants phenomena (HONAMI), are specifically dealt with. Applying the inertial-subrange theory of turbulence to canopy-eddies a method of evaluating the vertical transfer coefficient within crop canopies is presented and tested with earlier observations.