干旱缺水条件下麦田蒸散量的计算方法

干旱缺水条件下麦田蒸散量的计算方法

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Initial contribute: 2018-12-04

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Affiliation:  
岳天祥编著
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yue@lreis.ac.cn
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Application-focused categoriesNatural-perspectiveAtmospheric regions
Application-focused categoriesNatural-perspectiveAtmospheric regions

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干旱缺水条件下麦田蒸散量的计算方法

(1)麦田蒸散量数学方程:

      

式中,E0为蒸发力;ab为由实测资料回归求得的经验系数,随作物品种和种类而变化;为叶面积指数;为计算时段内的平均土壤含水量;为凋萎含水量;为临界土壤含量;cd为由实测资料确定的经验系数,它们随作物生育阶段和土壤条件而变化。

(2)缺水条件下麦田蒸散量的数学模型:

式中,均指10cm土层内的储水毫米数;E0指计算时段内的日平均蒸发力毫米数;Eta指计算时段内累积蒸发量毫米数;t为时间变量。

(3)计算蒸发力的彭曼公式:

式中,E0为蒸发力P0为海平面气压();P为计算站的实际气压();Δ为饱和水气压与温度曲线上在温度等于气温时水温斜率γ为温度计常数(取值0.66);为理论太阳辐射(以蒸发水层毫米计);n为实际日照时数;N为理论日照时数;为绝对黑体辐射(蒸发当量毫米数,σ为斯蒂芬-玻尔兹曼常数(其值为)),为绝对湿度();为实际水气压();为饱和水汽压();u2为离地面2m高处的风速();c’为风速修正系数;a’b’为由日照比率()估算太阳辐射的经验系数。

参考文献:

    康绍忠,熊运章:干旱缺水条件下麦田蒸发量的计算方法。地理学报,1990,454

How to Cite

《资源环境数学模型手册》 (2018). 干旱缺水条件下麦田蒸散量的计算方法, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/98cdb9d7-af04-4b14-98ca-0aa85b265418
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tingxin
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Contributor

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 : 
tingxin
Last modify time : 
2020-12-31
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