Simple Method for Estimating Pan Coefficients: Conversion of Pan Evaporation to Reference Evapotranspiration SCIE SCOPUS

Cited 6 time in WEB OF SCIENCE Cited 6 time in Scopus
Title
Simple Method for Estimating Pan Coefficients: Conversion of Pan Evaporation to Reference Evapotranspiration
Author(s)
Lee, Khil-Ha; Cho, Hong-Yeon
KIOST Author(s)
Cho, Hong Yeon(조홍연)
Publication Year
2012-01
Abstract
Reference evapotranspiration rates are often estimated by using pan evaporation data because pan data are widely available. Conversion of pan evaporation estimates to reference evapotranspiration relies on the determination of the pan coefficient (K-p). A simple linear equation has been suggested for estimating K-p on the basis of the energy balance, and it is expressed as a linear combination of wind speed and surface temperature at the reference height. In this study, the new equation for estimating K-p was calibrated by using a single-criteria multiple-parameter optimization technique, and cross-validation was performed to test the equation by using data from 10 meteorological stations in Korea. Because lysimeter data were not available, the Penman-Monteith equation was used as a reference in this study to calibrate and validate the suggested equation. The results showed that the averaged coefficient of determination (r(2)) was 0.92, the NSC was 0.93, and the RMSE was 8.99 mm. In general, the suggested equation provided reasonably accurate estimates of the reference evapotranspiration in the Korean Peninsula. The suggested equation presented here is advantageous because only two readily available pieces of climate data are required to estimate K-p. DOI: 10.1061/(ASCE)IR.1943-4774.0000379. (C) 2012 American Society of Civil Engineers.
ISSN
0733-9437
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3698
DOI
10.1061/(ASCE)IR.1943-4774.0000379
Bibliographic Citation
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING, v.138, no.1, pp.98 - 103, 2012
Publisher
ASCE-AMER SOC CIVIL ENGINEERS
Subject
SOLAR-RADIATION; TEMPERATURE; CALIBRATION
Keywords
Calibration; Pan coefficient; Water resources; Reference evapotranspiration; Penman-Monteith
Type
Article
Language
English
Document Type
Article
Publisher
ASCE-AMER SOC CIVIL ENGINEERS
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