植被内部及其上方湍流场的数值模拟

THE NUMERICAL SIMULATION OF TURBULENT FLOW IN AND ABOVE PLANT CANOPIES

中文摘要:

      植被内部及其上方的湍流流场对于了解植被与大气之间的动量、热量和质量交换过程极其重要。本文把高阶湍流封闭模型的Reynolds应力方程模型(RSM)应用于植被湍流的计算,得到了风速、湍流动能、Reynolds应力及能量耗散率的垂直分布,与现场观测数据比较,甚为满意。

英文摘要:

      Turbulent flow in and above plant canopies is of fundamental importance to the understanding of transport processes of momentum,heat and mass between plant.canopies and atmosphere,and to micrometeoroIogy.The Reynolds stress equation model of turbulence has been applied to calculate the turbulence in canopies in this paper.The calculated mean wind velocity profiles.Reynolds stress,turbulent kinetic energy and dissipation of turbulent energy in a corn canopy and a spruce forest are compared with field observed data and with Wilson and Shaw's model.The velocity profiles and Reynolds stress calculated by both models are in good agreement,and the length scale of turbulence appears to be similax.