| 一方程模型在植被冠层中的应用 |
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| 引用本文： | 张淑君,王惠民,蒋华.一方程模型在植被冠层中的应用[J].南京气象学院学报,2003,26(6):845-851. |
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| 作者姓名： | 张淑君 王惠民 蒋华 |
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| 作者单位： | 河海大学,环境科学与工程学院,江苏,南京,210098 |
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| 基金项目： | 国家自然科学基金资助项目(59779021) |
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| 摘 要： | 利用建立的一方程模式对植被气象场和湍流场进行了模拟计算。结果表明：在植被叶面积密度最大值处，由植被叶面积产生的阻力使风速急剧减小，而后平缓接近地面风速值。Reynolds应力从植被顶部向下剧烈减小，在Z／Hc值为0．4～0．6之间衰减迅速；冠层下部风速小且切变弱，湍流未能充分发展，因而动量输送甚微。由于在植被内部环境中存在着湍流通量的辐散或辐合的现象，湍流强度从植被底部开始由下至上逐渐增强，在冠层上方则基本保持不变。
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| 关 键 词： | 一方程模型 植被冠层 气象场 湍流场 数值模拟 |
| 文章编号： | 1000-2022(2003)06-0845-07 |
| 修稿时间： | 2003年1月10日 |
Application of One-equation Model in Vegetation Canopy Boundary Layer |
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| ZHANG Shu-jun,WANG Hui-min,JIANG Hua.Application of One-equation Model in Vegetation Canopy Boundary Layer[J].Journal of Nanjing Institute of Meteorology,2003,26(6):845-851. |
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| Authors: | ZHANG Shu-jun WANG Hui-min JIANG Hua |
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| Abstract: | A one-equation model is developed in this paper to simulate the meteorology and turbulent characteristics of vegetation.Results show that the wind velocity vegetation canopy rapidly decreases near the maximum vegetation leaf area density,then gently approaches to the ground surface.The reynolds stress abruptly decreases downwards from the top of vegetation,rapidly weakens between 0.4 and 0.6 of Z/Hc;At the bottom of vegetation canopy the wind and its shearing are small,the turbulence is also weak,therefore the momentum transfer is trivial.Due to the divergence/convergence of turbulence flux within vegetation,the intensity of turbulence gradually increases upwards from the bottom of vegetation,and approximately keeps constant above vegetation canopy. |
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| Keywords: | one-equation model vegetation canopy numerical simulation |
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