辐射收支、热量平衡方程

辐射收支、热量平衡方程

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contributed at 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Classification(s)

Earth System SubjectEarth Surface SystemAnthroposphere
Geography SubjectHuman GeographyAgricultural Geography

Detailed Description

辐射收支、热量平衡方程

(1) 麦田生态系统的辐射收支可表示为

     

式中,Rn为净辐射;Qt为太阳辐射;Qr为反射辐射;Ln为净长波辐射。

(2) 生态系统获得的净辐射经过转化,形成土壤热通量G,感热通量H,潜热通量Let,作物光合固定能量P和作物内能M,即:

     

       在实际工作中,PM的总和一般比主要成分的测量误差还小,可以忽略,则有:

                           

式中,β为波文比。

(3) 为分析作物蒸散满足程度,需计算潜在蒸散LEpPenman-Monteith公式,

            

式中,z为参考高度,d为零平面位移,u为参考高度的风速,D为空气饱和水汽压差,分别为动量和热量传输稳定度订正常数,分别为动量和水汽传输地表粗糙度;k为卡门常数;ρ为空气密度;Cp为空气定压比热;ra为空气动力学阻力。

参考文献:

    莫兴国,刘苏峡,于沪宁等:冬小麦能量平衡及蒸散分配的季节变化分析。地理学报,1997,526

How to cite

《资源环境数学模型手册》 (2018). 辐射收支、热量平衡方程, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/5cd0b095-6bd7-4048-9ae4-4de99ae6162c
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Contributor

contributed at 2018-12-04

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
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Is authorship not correct? Feed back

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