Estimation Models of Potential Evapotranspiration in Sichuan Province

Zhang Shunqian; Ma Zhenfeng; Zhang Yufang

Vol.20, NO.6, 2009

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2009 > 20(6): 729-736

Zhang Shunqian, Ma Zhenfeng, Zhang Yufang. Estimation models of potential evapotranspiration in Sichuan Province. J Appl Meteor Sci, 2009, 20(6): 729-736.

Citation:

Zhang Shunqian, Ma Zhenfeng, Zhang Yufang. Estimation models of potential evapotranspiration in Sichuan Province. J Appl Meteor Sci, 2009, 20(6): 729-736.

Zhang Shunqian, Ma Zhenfeng, Zhang Yufang. Estimation models of potential evapotranspiration in Sichuan Province. J Appl Meteor Sci, 2009, 20(6): 729-736.

Citation:

Zhang Shunqian, Ma Zhenfeng, Zhang Yufang. Estimation models of potential evapotranspiration in Sichuan Province. J Appl Meteor Sci, 2009, 20(6): 729-736.

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Estimation Models of Potential Evapotranspiration in Sichuan Province

Agricultural Meteorological Center, Sichuan Province, Chengdu 610071

Received Date: 2009-03-10
Rev Recd Date: 2016-01-13
Publish Date: 2009-12-31

Abstract

Abstract

Penman-Monteith formula is a standard method recommended by FAO-56 to calculate potential evapotranspiration. But it is difficult to apply in practical operation as not all related meteorological elements can be obtained in reality, so estimation models are used instead. In order to apply compound drought index in operation, Thornthwaite method and Hargreaves method for yearly and monthly potential evapotranspiration of Sichuan Basin and West Sichuan Plateau are studied.The observation data of 156 meteorological stations in Sichuan Province from 1971 to 2000 are investigated including minimum temperature, maximum temperature, wind speed, relative humidity, and sunshine hours.Using result of Penman-M onteith form ula as the ET0 standard value, the precisions of the two E_T0 estimation methods are analyzed.Comparing wind speed, relative humidity, Hargreaves method and Penman-Monteith method statistically, an operational Hargreaves method is established. These Hargreaves method and model have been applied to monitor serious summer drought in 2006 in Sichuan Province.The results show: As far as annual variation is concerned, annual value fluctuation estimated by Thornthwaite method is small so that it cannot reflect the E_T0 annual variation. However, Hargreaves method and PM method show basically consistent changing tendency and can reflect the E_T0 annual variation characteristics better. As for the annual mean, result of Thornthwaite method is significantly smaller.The error in the Basin is -10 %--20 % and -40 %--60 % on Plateau.Result of Hargreaves method is relatively smaller in Plateau and larger in Basin.But its error is 10 %-15 %, better than Thornthw aite's. As for the seasonal variation, error of Thornthwaite method is larger in winter but smaller in summer.Due to the influence of relative humidity and wind speed, seasonality of Hargreaves method's error is not obvious. The error of Hargreaves is smaller than that of Thornthwaite especially in Plateau region except for in summer.Results of Penman-Monteith formula and Hargreaves method show good linear relation.With the recovery factors air velocity and relative humidity introduced, the error of Hargreaves correction value can be controlled within 10%. It can meet the demand of practical operation for precision.The compound drought index calculated by this E_T0 estimation model has strong capability for drought monitoring in Sichuan Province.
- Sichuan;
- potential evapotranspiration;
- accuracy comparison;
- estimation model

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References(19)

Figures and Tables

图 1 PM 法与 Thornthwaite 法和 Hargreaves 法估算的E_T0逐年变化

Fig. 1 E_T0 annual change comparison based on PM, Thornthwaite and Hargreaves

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图 2 PM 法与 Thornthwaite 法和 Hargreaves 法估算的E_T0逐月变化

Fig. 2 E_T0 monthly change comparison based on PM, Thornthwaite and Hargreaves

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图 3 E_{T0_PM}与E_{T0_HG}之间的点聚图

Fig. 3 Poly-point plan between E_{T0_PM} andE_{T0_HG}

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图 4 订正后 E_T0与风速(a)和湿度(b)的关系

Fig. 4 Relationship of revised E_T0 to wind speed(a)and humidity(b), respectively

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表 1 Thornthwaite法和 Hargreaves 法估算误差比较 (单位:%)

Table 1 Estimation error comparison of Thornthwaite and Hargreaves (unit:%)

表 2 E_{T0_PM}与E_{T0_HG}之间的统计关系

Table 2 Statistics relation between E_{T0_PM} and E_{T0_HG}

表 3 订正前后E_{T0_HG}的精度比较

Table 3 Error comparison of E_{T0_HG} before and after revised

表 4 E_T0业务化估算模型及估算精度

Table 4 E_T0 operational model and estimation accuracy

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