scholarly journals A Parametric Model for Potential Evapotranspiration Estimation Based on a Simplified Formulation of the Penman- Monteith Equation

10.5772/52927 ◽  
2013 ◽  
Author(s):  
Aristoteles Tegos ◽  
Andreas Efstratiadis ◽  
Demetris Koutsoyiannis
Keyword(s):  
Potential Evapotranspiration ◽  
Parametric Model ◽  
Evapotranspiration Estimation ◽  
Monteith Equation

scholarly journals Potential evapotranspiration estimation and its effect on hydrological model response

2008 ◽  
Vol 30 (1) ◽  
pp. 20-32
Author(s):  
Vu Van Nghi ◽  
Do Duc Dung ◽  
Dang Thanh Lam
Keyword(s):  
Model Simulation ◽  
Potential Evapotranspiration ◽  
Step Method ◽  
Model Response ◽  
Central Vietnam ◽  
One Step ◽  
Vegetation Parameters ◽  
Evapotranspiration Estimation ◽  
The One ◽  
Monteith Equation

Potential evapotranspiration can be directly calculated by the Penman-Monteith equation, known as the one-step method. The approach requires data on the land cover and related-vegetation parameters based on AVHRR and LDAS information, which are available in recent years. The Nong Son basin, a sub-catchment of the Vu Gia-Thu Bon basin in the Central Vietnam, is selected for this study. To this end, NAM model was used; the results obtained show that the NAM model has the potential to reproduce the effects of potential evapotranspiration on hydrological response. This is seemingly manifested in the good agreement between model simulation of discharge and the observed at the stream gauge.

scholarly journals Sensitivity analysis of potential evapotranspiration to key climatic factors in the Shiyang River Basin

2020 ◽  
Author(s):  
Xuelei Zhang ◽  
Weihua Xiao ◽  
Yicheng Wang ◽  
Yan Wang ◽  
Miaoye Kang ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
River Basin ◽  
Air Temperature ◽  
Climatic Factors ◽  
Potential Evapotranspiration ◽  
Mountainous Region ◽  
Shiyang River Basin ◽  
Increasing Trends ◽  
Maximum Air Temperature ◽  
Monteith Equation

Abstract This paper focuses on determining the spatial and temporal characteristics of the sensitivity coefficients (SCs) between potential evapotranspiration (ET0) and key climatic factors across the Shiyang River Basin (SYRB) from 1981 to 2015. Penman–Monteith equation and a sensitivity analysis were used to calculate ET0 and the SCs for key climatic factors. Sen's slope was used to analyze the observed series. According to the results, the sensitivity significances were in the order of relative humidity (RH) > net solar radiation (NSR) > wind speed (WS) > maximum air temperature (Tmax) > minimum air temperature (Tmin). The SCs for the RH and NSR were larger in the upper mountainous region, while the other three coefficients were larger in the middle and lower reaches. All five climatic factors for the ET0 SCs showed increasing trends in the mountainous region, and the Tmax, WS and RH SCs increased in the middle and lower reaches. Over the past 35 years, the change in ET0 was dominated by the air temperature (T), RH and NSR, and the increase in ET0 during the studied period was mainly due to the increases in T and NSR.

scholarly journals Canopy Resistance and Estimation of Evapotranspiration above a Humid Cypress Forest

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Bau-Show Lin ◽  
Huimin Lei ◽  
Ming-Che Hu ◽  
Supattra Visessri ◽  
Cheng-I Hsieh
Keyword(s):  
Water Vapor ◽  
Seasonal Variations ◽  
Sensible Heat Flux ◽  
Sensible Heat ◽  
Canopy Resistance ◽  
Data Set ◽  
Water Vapor Flux ◽  
Vapor Flux ◽  
Evapotranspiration Estimation ◽  
Monteith Equation

This study presented a two-year data set of sensible heat and water vapor fluxes above a humid subtropical montane Cypress forest, located at 1650 m a.s.l. in northeastern Taiwan. The focuses of this study were to investigate (1) the diurnal and seasonal variations of canopy resistance and fluxes of sensible heat and water vapor above this forest; and (2) the mechanism of why a fixed canopy resistance could work when implementing the Penman–Monteith equation for diurnal hourly evapotranspiration estimation. Our results showed distinct seasonal variations in canopy resistance and water vapor flux, but on the contrary, the sensible heat flux did not change as much as the water vapor flux did with seasons. The seasonal variation patterns of the canopy resistance and water vapor flux were highly coupled with the meteorological factors. Also, the results demonstrated that a constant (fixed) canopy resistance was good enough for estimating the diurnal variation of evapotranspiration using Penman–Monteith equation. We observed a canopy resistance around 190 (s/m) for both the two warm seasons; and canopy resistances were around 670 and 320 (s/m) for the two cool seasons, respectively. In addition, our analytical analyses demonstrated that when the average canopy resistance is higher than 200 (s/m), the Penman–Monteith equation is less sensitive to the change of canopy resistance; hence, a fixed canopy resistance is suitable for the diurnal hourly evapotranspiration estimation. However, this is not the case when the average canopy resistance is less than 100 (s/m), and variable canopy resistances are needed. These two constraints (200 and 100) were obtained based on purely analytical analyses under a moderate meteorological condition (Rn = 600 W·m−2, RH = 60%, Ta = 20°C, U = 2 m·s−1) and a measurement height around two times of the canopy height.

Sensitivity of potential evapotranspiration estimation to the Thornthwaite and Penman–Monteith methods in the study of global drylands

2017 ◽  
Vol 34 (12) ◽  
pp. 1381-1394 ◽  
Author(s):  
Qing Yang ◽  
Zhuguo Ma ◽  
Ziyan Zheng ◽  
Yawen Duan
Keyword(s):  
Potential Evapotranspiration ◽  
Evapotranspiration Estimation

scholarly journals Influence of different methods of potential evapotranspiration estimation in the catolé grande river flow using the swat model

2020 ◽  
Vol 6 (3) ◽  
pp. 13893-13906
Author(s):  
Lorena Lima Ferraz ◽  
Lucas Farias Sousa ◽  
Cristiano Tagliaferre ◽  
Joseane Oliveira Silva ◽  
Carlos Amilton Silva Santos ◽  
...  
Keyword(s):  
River Flow ◽  
Potential Evapotranspiration ◽  
Swat Model ◽  
Evapotranspiration Estimation

scholarly journals Applicability of six potential evapotranspiration estimation methods in Liaoning Province

资源科学 ◽  
2019 ◽  
Vol 41 (10) ◽  
pp. 1780-1790
Author(s):  
Yongqiang CAO ◽  
Mingyang LIU ◽  
Yuanfei LI ◽  
Chunliu XIAO ◽  
Keyword(s):  
Potential Evapotranspiration ◽  
Liaoning Province ◽  
Estimation Methods ◽  
Evapotranspiration Estimation
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