区域的线性蒸发散模型

区域的线性蒸发散模型

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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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Application-focused categoriesNatural-perspectiveLand regions

Model Description

Chinese {{currentDetailLanguage}} Chinese

区域的线性蒸发散模型

1.计算模型

(1) 地表热量平衡方程表达式:

  

式中: LE 为潜热通量(E为蒸散量,单位:mm); 为净辐射; H为显热通量;G为土壤热通量;它们的单位为PH为用于植被光合作用和生物量增加的能量,由于其值很小,在实际计算中可以忽略。

 (2)植被覆盖区和裸露土壤区所占比例的计算公式:

  

式中:为植被覆盖区蒸散量; 为裸露土壤蒸发量; f为像元中植被覆盖度,表示单位面积中植被所占比例; 1-f表示单位面积中棵土所占比例。

(3)蒸发散量与任一时刻的蒸发散量存在的正弦关系表达式:

  

式中: 为日蒸发散量; LE为时刻t蒸发散量; 为卫星获取数据的时间;为日蒸发散时数,取比日照时数2小时。至此,可根据①,②式推算出区域的日蒸发散量。

2.参数求取 

(1) 地表的辐射平衡方程表示如下:

  

式中: Q为太阳总辐射; 为地表反射率; δStefan-Boltzmann常数; 为大气长波辐射,为空气比辐射率,;为气温时的实际水汽压(hPa; 为地表长波辐射; 为地表辐射温度。

(2) 行星反照率与地表反照率回归方程:

   

( 3) G的计算公式:

  

(4)显热通量可以用湍流形式表现为:

   

式中: 为空气的体积热容量; 为参考高度处的空气温度; 由气象数据提供; 为蒸发散表面温度;对于裸士其蒸发收表面温度取地表面温度;对于植被覆盖区其蒸发散表面温度取植被冠层温度可分别由NOAA45通道的亮温求得; 为空气动力学阻抗。

参考文献

陈云:中国西北地区蒸发数量计算的遇感研究。地理学报,2001, 56(3)

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How to Cite

《资源环境数学模型手册》 (2018). 区域的线性蒸发散模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/e331892c-daf5-421b-8a12-67177b24ff60
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Last modifier : 
haolingchen
Last modify time : 
2020-11-02
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Contributor(s)

initial contribute: 2018-12-04

Authorship

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

History

Last modifier : 
haolingchen
Last modify time : 
2020-11-02
Modify times : 
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