Evapotranspiration Estimation Based on the Complementary Relationships

Venturini, Virginia; Krepper, Carlos M.; Rodríguez, Leticia

doi:10.5772/17042

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…Although Granger [1989] provided an unambiguous definition of D Ã in this context, some researchers have interpreted it as the slope of saturated vapor pressure at air temperature [e.g., Venturini et al, 2012]. The crucial point here is that D Ã is defined using two unknowns, the drying surface temperature (T s ) and the hypothetical wet surface temperature (T w ) and both must be specified in this version of the asymmetrical complementary relationship.…”

Section: Previous Derivations Of the Crmentioning

confidence: 99%

A generalized complementary relationship between actual and potential evaporation defined by a reference surface temperature

Aminzadeh

Roderick

2016

Water Resources Research

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The definition of potential evaporation remains widely debated despite its centrality for hydrologic and climatic models. We employed an analytical pore-scale representation of evaporation from terrestrial surfaces to define potential evaporation using a hypothetical steady state reference temperature that is common to both air and evaporating surface. The feedback between drying land surfaces and overlaying air properties, central in the Bouchet (1963) complementary relationship, is implicitly incorporated in the hypothetical steady state where the sensible heat flux vanishes and the available energy is consumed by evaporation. Evaporation rates predicted based on the steady state reference temperature hypothesis were in good agreement with class A pan evaporation measurements suggesting that evaporation from pans occurs with negligible sensible heat flux. The model facilitates a new generalization of the asymmetric complementary relationship with the asymmetry parameter b analytically predicted for a wide range of meteorological conditions with initial tests yielding good agreement between measured and predicted actual evaporation.

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Section: Previous Derivations Of the Crmentioning

confidence: 99%

A generalized complementary relationship between actual and potential evaporation defined by a reference surface temperature

Aminzadeh

Roderick

2016

Water Resources Research

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“…Although it is not the scope of this work to analyse the sensitivity of CR to small changes in k , we compare the aforementioned k with those published in the literature (Ramirez et al ., ; Venturini et al ., ). Although ET H&S matches the averaged recharge better than ET Turc , the k = 2.17 is comparable with those published, whereas k = 2.3 is a little larger.…”

Section: Resultsmentioning

confidence: 99%

Water balance of the Salado–Juramento river basin (Argentina)

Venturini

Krepper

2012

Hydrological Processes

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A lumped water balance model was used to derive a monthly water storage series in the Salado–Juramento southern basin, for the period 1954–1986. The evapotranspiration term was estimated using the Bouchet's complementary relationship. Different evapotranspiration formulas following the concepts of potential evapotranspiration and wet environmental evapotranspiration were used. The regional average groundwater levels and the specific yield were used to tune Bouchet's equation. The extrapolation of the water storage series to a secular period (1901–2002) was achieved using a synthetic annual discharge series. The water storage was deficient for most of the century, i.e. more than 60 years; nevertheless in the last 30 years, the system recovers half of the water previously lost. The singular spectral analysis showed that a significant low‐frequency signal is present in the water storage and precipitation series. The main cause of water storage variability would be given by precipitation, in spite of the vast anthropogenic changes on the basin. Anthropogenic effects would be reflected in the river discharges, where no significant signal is detected before 1970; however, an annual signal is insinuated after that year. The conclusions of this work could be different if we only looked at the 1954–1986 period. The results of that period suggest that the basin is primarily accumulating water instead of being mainly in deficit. Thus, here we demonstrated the importance of the secular analysis to illustrate the complete basin behaviour. Copyright © 2012 John Wiley & Sons, Ltd.

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“…Here we have one equation (A7) and two unknowns (s 1 and s 3 ), which is not uniquely solvable using the assumptions and the iterative procedure described in Venturini et al [2008] as adopted by Mallick et al [2014]. However, in a more recent follow up study, Venturini et al [2012] proposed a simplified method of T SD estimation. Following Venturini et al [2012], we similarly revise some aspects of T SD estimation in the present analysis, by directly assigning s 3 as a function of T R and s 1 as a function of T D , the general form of which is s54098 6:108e 17:27T ðT1237:3Þ ðT1237:3Þ 2 !…”

Section: Appendix Amentioning

confidence: 99%

“…However, in a more recent follow up study, Venturini et al [2012] proposed a simplified method of T SD estimation. Following Venturini et al [2012], we similarly revise some aspects of T SD estimation in the present analysis, by directly assigning s 3 as a function of T R and s 1 as a function of T D , the general form of which is s54098 6:108e 17:27T ðT1237:3Þ ðT1237:3Þ 2 ! .…”

Section: Appendix Amentioning

confidence: 99%

Reintroducing radiometric surface temperature into the Penman‐Monteith formulation

Mallick

Boegh

Trebs

et al. 2015

Water Resources Research

116

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Here we demonstrate a novel method to physically integrate radiometric surface temperature (T R ) into the Penman-Monteith (PM) formulation for estimating the terrestrial sensible and latent heat fluxes (H and kE) in the framework of a modified Surface Temperature Initiated Closure (STIC). It combines T R data with standard energy balance closure models for deriving a hybrid scheme that does not require parameterization of the surface (or stomatal) and aerodynamic conductances (g S and g B ). STIC is formed by the simultaneous solution of four state equations and it uses T R as an additional data source for retrieving the ''near surface'' moisture availability (M) and the Priestley-Taylor coefficient (a). The performance of STIC is tested using high-temporal resolution T R observations collected from different international surface energy flux experiments in conjunction with corresponding net radiation (R N ), ground heat flux (G), air temperature (T A ), and relative humidity (R H ) measurements. A comparison of the STIC outputs with the eddy covariance measurements of kE and H revealed RMSDs of 7-16% and 40-74% in half-hourly kE and H estimates. These statistics were 5-13% and 10-44% in daily kE and H. The errors and uncertainties in both surface fluxes are comparable to the models that typically use land surface parameterizations for determining the unobserved components (g S and g B ) of the surface energy balance models. However, the scheme is simpler, has the capabilities for generating spatially explicit surface energy fluxes and independent of submodels for boundary layer developments.

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Evapotranspiration Estimation Based on the Complementary Relationships

Cited by 7 publications

References 49 publications

A generalized complementary relationship between actual and potential evaporation defined by a reference surface temperature

A generalized complementary relationship between actual and potential evaporation defined by a reference surface temperature

Water balance of the Salado–Juramento river basin (Argentina)

Reintroducing radiometric surface temperature into the Penman‐Monteith formulation

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