Effect of black polyethylene shade covers on the evaporation rate of agricultural reservoirs
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Martínez Álvarez, Víctoriano; Baille, Alain Daniel; Molina Martínez, José Miguel; González Real, María MilagrosÁrea de conocimiento
Ingeniería AgroforestalPatrocinadores
The authors acknowledge the Fundación Séneca (Murcia, Spain) for their financial support of this study through grant 02978/PI/05 «Evaporación de agua en embalses de regulación de riego: modelización del proceso y estudio de la viabilidad técnica y económica de su reducción mediante técnicas de sombreo».Fecha de publicación
2006Editorial
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)Cita bibliográfica
MARTÍNEZ ÁLVAREZ, M., BAILLE, A., MOLINA MARTÍNEZ, J.M., GONZÁLEZ REAL, M.M. Effect of black polyethylene shade covers on the evaporation rate of agricultural reservoirs. Spanish Journal of Agricultural Research 4 (4): 280-288. 2006. ISSN 1695-971-XRevisión por pares
siPalabras clave
Tanque clase-ACondensación
Viabilidad económica
Balsas de riego
Coeficiente de transferencia de masa
Efectos de escala
Class-A pan
Condensation
Economic viability
Farm dams
Mass transfer coefficient
Scale effect
Resumen
[ENG] The potential use of shade covers to reduce evaporation from agricultural reservoirs motivated this study on the
effect of black polyethylene shade on the evaporation rate from a small water body (Class-A pan) and of its driving
variables. Evaporation was measured hourly in two pans during the summer in Cartagena (Spain), along with the
measurements of air temperature and humidity, water temperature, solar radiation and wind speed. The first pan was
uncovered whereas the second pan was covered with black polyethylene shade as either a single or double-layer. The
main factors influencing reduced evaporation (mass transfer coefficient and surface-to-air vapour pressure deficit)
were analyzed, focusing on the changes in the uncovered pan. In the shaded pan there was a decrease in daily evaporation
of 75 and 83% for single and double-layer shade respectively. Condensation on the shade was considerable and was
14 and 21% of the daily evaporation losses for the single and doubl ...
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