• CN 62-1175/P
• ISSN 1006-7639
• 双月刊
• 中国科技核心期刊
• 中国学术期刊综合评价数据库统计源期刊
• 中文科技期刊数据库收录期刊

• 论文 •

### 湖北省潜在蒸散估算模型对比

1. 武汉区域气候中心， 湖北 武汉 430074
• 出版日期:2014-05-17 发布日期:2014-05-17
• 作者简介:秦鹏程(1986 － )， 男， 河南南阳人， 助理工程师， 主要从事气候服务和应用气象研究． E － mail:qinpengcheng027@163． com
• 基金资助:

中国气象局业务建设项目 “极端天气气候事件监测预测业务平台建设” 资助

### Comparison of Models for Estimating Potential Evapotranspiration in Hubei Province

1. Wuhan Regional Climate Center，Wuhan 430074，China
• Online:2014-05-17 Published:2014-05-17

Abstract:

Based on the daily meteorological data from 1961 to 2011 of 74 stations in Hubei Province，FAO56 － Penman － Monteith (FAO － PM) equation and three other empirical equations according to Priestley － Taylor，Hargreaves and Thornthwaite were used to estimate the monthly potential evapotranspiration (PET)，and the applicability of the three empirical equations were evaluated by comparing with the FAO － PM model from monthly，seasonally and yearly scales as well as under different conditions of dry，moderate and wet． Results showed that monthly PETs estimated by the three empirical equations showed great differences compared to that of FAO －PM，especially for the summer months． The PET estimated by the Thornthwaite equation had the largest error and opposite deviations in summer and winter months，the PET estimated by the Priestley － Taylor equation had the smallest error，and the PET estimated by the Hargreaves equation had the most stable deviations among different months． All in all， well relationships were found between PETs estimated by the three empirical equations and FAO － PM equation， and the three empirical equations were fairly stable in relationship with FAO － PM among different regions，thereinto，only the Hargreaves equation was consistent with FAO － PM in different seasons as well as under different dry/wet conditions． As to the yearly variation of PET，the Priestley － Taylor equation showed the best agreement with FAO － PM equation，while the Hargreaves equation only captured the yearly variability， the Thornthwaite equation gave a rather precise estimate in magnitude but an opposite trend and too small variability． It was recommended that in climate，crop and hydrologic modeling as well as climate change analysis the Priestley － Taylor equation should be employed，in the practical drought monitoring and irrigation schedule the Hargreaves equation would be the best， in dry/wet climate zoning the Thornthwaite equation might work well． Additionally，necessary corrections should be done based on the FAO － PM estimates if possible，and such a practice should be carried out
on a monthly or seasonal timescale．

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