Evaporation and Transpiration

Rigon, Riccardo; Bottazzi, Michele; Tubini, Niccolo'; Bancheri, Marialaura; D'Amato, Concetta

doi:10.1061/9780784401385.ch04

Cited by 21 publications

(2 citation statements)

References 200 publications

(271 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ET 0 was estimated daily with the FAO-56 Penman–Monteith method using Equation (1) [ 22 , 63 ]; this method is useful for arid, temperate, and tropical zones [ 19 , 22 ].

where

is the net radiation at the reference crop surface (MJ m −2 d −1 );

is the soil heat flux density (MJ m −2 d −1 );

is the wind speed at 2 m height (m s −1 );

is the saturation vapor pressure (kPa);

is the actual vapor pressure (kPa);

is the vapor pressure deficit (kPa);

is the slope of the vapor saturation pressure curve (kPa °C −1 );

is the mean daily air temperature at 2 m height (°C); and

is the psychrometric constant (kPa °C −1 ).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Estimation of Reference Evapotranspiration in a Semi-Arid Region of Mexico

Delgado-Ramírez

González

Nolasco

et al. 2023

Sensors

View full text Add to dashboard Cite

Reference evapotranspiration (ET0) is the first step in calculating crop irrigation demand, and numerous methods have been proposed to estimate this parameter. FAO-56 Penman–Monteith (PM) is the only standard method for defining and calculating ET0. However, it requires radiation, air temperature, atmospheric humidity, and wind speed data, limiting its application in regions where these data are unavailable; therefore, new alternatives are required. This study compared the accuracy of ET0 calculated with the Blaney–Criddle (BC) and Hargreaves–Samani (HS) methods versus PM using information from an automated weather station (AWS) and the NASA-POWER platform (NP) for different periods. The information collected corresponds to Module XII of the Lagunera Region Irrigation District 017, a semi-arid region in the North of Mexico. The HS method underestimated the reference evapotranspiration (ET0) by 5.5% compared to the PM method considering the total ET0 of the study period (26 February to 9 August 2021) and yielded the best fit in the different evaluation periods (daily, 5-day mean, and 5-day cumulative); the latter showed the best values of inferential parameters. The information about maximum and minimum temperatures from the NP platform was suitable for estimating ET0 using the HS equation. This data source is a suitable alternative, particularly in semi-arid regions with limited climatological data from weather stations.

show abstract

“…ET 0 was estimated daily with the FAO-56 Penman–Monteith method using Equation (1) [ 22 , 63 ]; this method is useful for arid, temperate, and tropical zones [ 19 , 22 ].

where

is the net radiation at the reference crop surface (MJ m −2 d −1 );

is the soil heat flux density (MJ m −2 d −1 );

is the wind speed at 2 m height (m s −1 );

is the saturation vapor pressure (kPa);

is the actual vapor pressure (kPa);

is the vapor pressure deficit (kPa);

is the slope of the vapor saturation pressure curve (kPa °C −1 );

is the mean daily air temperature at 2 m height (°C); and

is the psychrometric constant (kPa °C −1 ).…”

Section: Methodsmentioning

confidence: 99%

“…ET 0 was estimated daily with the FAO-56 Penman-Monteith method using Equation (1) [22,63]; this method is useful for arid, temperate, and tropical zones [19,22].…”

Section: Fao-56 Penman-monteith Methods (Et 0 -Pm)mentioning

confidence: 99%

Estimation of Reference Evapotranspiration in a Semi-Arid Region of Mexico

Delgado-Ramírez

González

Nolasco

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

Estimating crop coefficients from fraction of ground cover and height

2009

View full text Add to dashboard Cite

The FAO-56 procedure for estimating the crop coefficient K c as a function of fraction of ground cover and crop height has been formalized in this study using a density coefficient K d. The density coefficient is multiplied by a basal K c representing full cover conditions, K cb full , to produce a basal crop coefficient that represents actual conditions of ET and vegetation coverage when the soil surface is dry. K cb full is estimated primarily as a function of crop height. K cb full can be adjusted for tree crops by multiplying by a reduction factor (F r) estimated using a mean leaf stomatal resistance term. The estimate for basal crop coefficient, K cb , is further modified for tree crops if some type of ground-cover exists understory or between trees. The single (mean) crop coefficient is similarly estimated and is adjusted using a K soil coefficient that represents background evaporation from wet soil. The K c estimation procedure was applied to the development periods for seven vegetable crops grown in California. The average root mean square error between estimated and measured K c was 0.13. The K c estimation procedure was also used to estimate K c during midseason periods of horticultural crops (trees and vines) reported in the literature. Values for mean leaf stomatal resistance and the F r reduction factor were derived that explain the literature K c values and that provide a consistent means to estimate K c over a broad range of fraction of ground cover.

show abstract

A Landsat-based energy balance and evapotranspiration model in Western US water rights regulation and planning

Allen

Tasumi

Morse³

et al. 2005

Irrig Drainage Syst

283

146

View full text Add to dashboard Cite

The quantification of evapotranspiration (ET) from irrigated projects is important for water rights management, water resources planning and water regulation. Traditionally, ET has been estimated by multiplying a weather-based reference ET by crop coefficients (K c ) determined according to the crop type and the crop growth stage. However, there is typically question regarding whether crops grown compare with the conditions represented by the K c values, especially in water short areas. In addition, it is difficult to estimate the correct crop growth stage dates for large populations of crops and fields.METRIC (Mapping Evapotranspiration at high Resolution and with Internalized Calibration) is an image-processing model for calculating ET as a residual of the surface energy balance. METRIC is a variant of SEBAL, an energy balance process developed in the Netherlands by Bastiaanssen and was extended to provide tighter integration with ground-based reference ET. METRIC was applied with Landsat images in southern Idaho to predict monthly and seasonal ET for water rights accounting and for operation of ground water models. ET "maps" (i.e., images) provide the means to quantify, in terms of both the amount and spatial distribution, the ET on a field by field basis.The ET maps have been used in Idaho to quantify net ground-water pumpage in areas where water extraction from underground is not measured and to estimate recharge from surface-irrigated lands. Application and testing of METRIC indicates substantial promise as an efficient, accurate, and relatively inexpensive procedure to predict the actual evaporation fluxes from irrigated lands throughout a growing season.

show abstract

Evaporation and Transpiration

Cited by 21 publications

References 200 publications

Estimation of Reference Evapotranspiration in a Semi-Arid Region of Mexico

Estimation of Reference Evapotranspiration in a Semi-Arid Region of Mexico

Estimating crop coefficients from fraction of ground cover and height

A Landsat-based energy balance and evapotranspiration model in Western US water rights regulation and planning

Contact Info

Product

Resources

About