Energy balance and evaporation loss of an agricultural reservoir in a semi‐arid climate (south‐eastern Spain)
Identifieur interne : 000731 ( Main/Exploration ); précédent : 000730; suivant : 000732Energy balance and evaporation loss of an agricultural reservoir in a semi‐arid climate (south‐eastern Spain)
Auteurs : B. Gallego-Elvira [Espagne] ; A. Baille [Espagne] ; B. Martín-G Rriz [Espagne] ; V. Martínez-Álvarez [Espagne]Source :
- Hydrological Processes [ 0885-6087 ] ; 2010-03-15.
English descriptors
Abstract
A typical agricultural water reservoir (AWR) of 2400 m2 area and 5 m depth, located in a semi‐arid area (southern Spain), was surveyed on a daily basis for 1 year. The annual evaporation flux was 102·7 W m−2, equivalent to an evaporated water depth of 1310 mm year−1. The heat storage rate G exhibited a clear annual cycle with a peak gain in April (G ∼ 45 W m−2) and a peak loss in November (G ∼ 40 W m−2), leading to a marked annual hysteretic trend when evaporation (λE) was related to net radiation (Rn). λE was strongly correlated with the available energy A, representing 91% of the annual AWR energy loss. The sensible heat flux H accounted for the remaining 9%, leading to an annual Bowen ratio in the order of 0·10. The equilibrium and advective evaporation terms of the Penman formula represented 76 and 24%, respectively, of the total evaporation, corresponding to a annual value of the Priestley–Taylor (P–T) coefficient (α) of 1·32. The P–T coefficient presented a clear seasonal pattern, with a minimum of 1·23 (July) and a maximum of 1·65 (December), indicating that, during periods of limited available energy, AWR evaporation increased above the potential evaporation as a result of the advection process. Overall, the results stressed that accurate prediction of monthly evaporation by means of the P–T formula requires accounting for both the annual cycle of storage and the advective component. Some alternative approaches to estimating Rn, G and α are proposed and discussed. Copyright © 2009 John Wiley & Sons, Ltd.
Url:
DOI: 10.1002/hyp.7520
Affiliations:
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Martín-G Rriz</name><affiliation wicri:level="2"><country xml:lang="fr">Espagne</country><wicri:regionArea>Agricultural Engineering Department, Technical University of Cartagena, Paseo Alfonso XIII, 48, 30203 Cartagena</wicri:regionArea><placeName><region nuts="2" type="communauté">Région de Murcie</region></placeName></affiliation></author><author><name sortKey="Martinez Varez, V" sort="Martinez Varez, V" uniqKey="Martinez Varez V" first="V." last="Martínez-Álvarez">V. 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Process.</title><idno type="ISSN">0885-6087</idno><idno type="eISSN">1099-1085</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2010-03-15">2010-03-15</date><biblScope unit="volume">24</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="758">758</biblScope><biblScope unit="page" to="766">766</biblScope></imprint><idno type="ISSN">0885-6087</idno></series><idno type="istex">192AD1D3243C53E8240331219664A2193C12F0E7</idno><idno type="DOI">10.1002/hyp.7520</idno><idno type="ArticleID">HYP7520</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0885-6087</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bowen ratio</term><term>Priestley–Taylor formula</term><term>energy partitioning</term><term>heat storage</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A typical agricultural water reservoir (AWR) of 2400 m2 area and 5 m depth, located in a semi‐arid area (southern Spain), was surveyed on a daily basis for 1 year. The annual evaporation flux was 102·7 W m−2, equivalent to an evaporated water depth of 1310 mm year−1. The heat storage rate G exhibited a clear annual cycle with a peak gain in April (G ∼ 45 W m−2) and a peak loss in November (G ∼ 40 W m−2), leading to a marked annual hysteretic trend when evaporation (λE) was related to net radiation (Rn). λE was strongly correlated with the available energy A, representing 91% of the annual AWR energy loss. The sensible heat flux H accounted for the remaining 9%, leading to an annual Bowen ratio in the order of 0·10. The equilibrium and advective evaporation terms of the Penman formula represented 76 and 24%, respectively, of the total evaporation, corresponding to a annual value of the Priestley–Taylor (P–T) coefficient (α) of 1·32. The P–T coefficient presented a clear seasonal pattern, with a minimum of 1·23 (July) and a maximum of 1·65 (December), indicating that, during periods of limited available energy, AWR evaporation increased above the potential evaporation as a result of the advection process. Overall, the results stressed that accurate prediction of monthly evaporation by means of the P–T formula requires accounting for both the annual cycle of storage and the advective component. Some alternative approaches to estimating Rn, G and α are proposed and discussed. Copyright © 2009 John Wiley & Sons, Ltd.</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Région de Murcie</li></region></list><tree><country name="Espagne"><region name="Région de Murcie"><name sortKey="Gallego Lvira, B" sort="Gallego Lvira, B" uniqKey="Gallego Lvira B" first="B." last="Gallego-Elvira">B. Gallego-Elvira</name></region><name sortKey="Baille, A" sort="Baille, A" uniqKey="Baille A" first="A." last="Baille">A. Baille</name><name sortKey="Baille, A" sort="Baille, A" uniqKey="Baille A" first="A." last="Baille">A. Baille</name><name sortKey="Martin Rriz, B" sort="Martin Rriz, B" uniqKey="Martin Rriz B" first="B." last="Martín-G Rriz">B. Martín-G Rriz</name><name sortKey="Martinez Varez, V" sort="Martinez Varez, V" uniqKey="Martinez Varez V" first="V." last="Martínez-Álvarez">V. Martínez-Álvarez</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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