TITLE:
Regional Calibration of Hargreaves Equation in the Xiliaohe Basin
AUTHORS:
Leizhi Wang, Qingfang Hu, Yintang Wang, Yong Liu, Lingjie Li, Tingting Cui
KEYWORDS:
Reference Crop Evapotranspiration, Penman-Monteith, Hargreaves, SCE-UA, Xiliaohe
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.4 No.7,
July
22,
2016
ABSTRACT: This paper
investigates calibration of Hargreaves equation in Xiliaohe Basin. Twelve
meteorologicalgauges located within Xiliaohe Basin in Northeast China were
monitored during 1970 and 2014 providing continuous records of meteorological
data. Taking daily ET0 calculated by Penman-Montieth equation as the
benchmark, the error of Hargreaves equation for computing ET0 was
evaluated and the investigation on regional calibration of Hargreaves equation
was carried out. Results showed there was an obvious difference between the
calculating results of Hargreaves and Penman-Monteith equation. The estimation
of the former was obviously higher during June and September while lower during
the rest time in a year. The three empirical parameters of the Hargreaves
equation were calibrated using the SCE-UA (Shuffled Complex Evolution) method,
and the calibrated Hargreaves equation showed an obvious promotion in the
accuracy both during the calibration and verification period.