Comparison of Shuttleworth–Wallace and Dual Crop Coefficient Method for Estimating Evapotranspiration of a Tea Field in Southeast China

Haofang Yan (), Song Huang, Jianyun Zhang, Chuan Zhang, Guoqing Wang, Lanlan Li, Shuang Zhao, Mi Li and Baoshan Zhao
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Haofang Yan: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Song Huang: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Jianyun Zhang: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
Chuan Zhang: Institute of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Guoqing Wang: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
Lanlan Li: Institute of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Shuang Zhao: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Mi Li: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Baoshan Zhao: South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524091, China

Agriculture, 2022, vol. 12, issue 9, 1-17

Abstract: Determination of evaporation ( E ) and transpiration ( T ) in tea fields separately is important in developing precise irrigation scheduling and enhancing water use efficiency. In this study, the Shuttleworth–Wallace (S-W) model was applied to simulate the variations of E and T based on the data from 2015 to 2018 in a tea field in southeast China. The dual crop coefficient (D-K) method recommended by FAO-56 was also applied to calculate E and T , using the same data set to compare with the S-W model. The measured crop coefficient ( K c ) ranged from 0.43 to 1.44 with the average value was 0.90 during 1–150 DOY (days of year), and the measured K c tended to be stable with the average value of 0.83 during 151–365 DOY in 2015. The S-W model estimated ET c with root mean square error ( RMSE ) and R 2 of 0.45 mm d −1 and 0.97, while for the D-K method the values were 0.61 mm d −1 and 0.95. Therefore, both approaches could estimate the E and T separately in tea fields in southeast China, however, the D-K method had a slightly poorer accuracy compared to the S-W model in the estimation of ET c .

Keywords: Shuttleworth–Wallace model; dual crop coefficient method; evapotranspiration; tea field (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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