规则丛生冠层的半球面辐射及直接辐射通量模型

规则丛生冠层的半球面辐射及直接辐射通量模型

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Initial contribute: 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Method-focused categoriesData-perspectiveRemote sensing analysis

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Chinese {{currentDetailLanguage}} Chinese

规则丛生冠层的半球面辐射及直接辐射通量模型

1. 半球面辐射通量

(1) 拦截效率表示为:

式中,是直接辐射的拦截效率;是漫散射辐射的拦截效率;是直接辐射;是漫射辐射;是总的辐射。

式中,是直接入射辐射的顶角,是方位角。

(2) 冠层的吸收效率可写为:

(3) 冠层光谱漫反射率的公式为:

式中,分别是树叶吸收与输液反射系数;为树干的拦截效率。

2.定向反射系数

为了计算方向辐射率,冠层被看做是一个水平同类的无限传输层。假定定向反射系数由植被与土壤分布组成,树叶和土壤则被假定为Lambertian,那么植被的定向发射系数可以表示为:

式中,是观察角度;K是总辐射衰减系数;是观察角度的衰减系数。

土壤组分的反射系数:

式中,是土壤反射系数。

 

参考文献:

Bégué A:规则丛生冠层的半球面辐射及直接辐射通量模型。Remote Sensing ofEnvironment199240

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How to Cite

《资源环境数学模型手册》 (2018). 规则丛生冠层的半球面辐射及直接辐射通量模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/f64cf1dd-4e9b-4559-8c81-25caa12605bf
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zhangshuo
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Initial contribute: 2018-12-04

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Authorship

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

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Last modifier : 
zhangshuo
Last modify time : 
2020-11-11
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