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Evaporation from partially covered water surfaces
Year:
2010
Source of publication :
Water Resources Research
Authors :
Assouline, Shmuel
;
.
Narkis, Kfir
;
.
Volume :
46
Co-Authors:
Assouline, S., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, ARO Volcani Center, Bet Dagan 50250, Israel
Narkis, K., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, ARO Volcani Center, Bet Dagan 50250, Israel
Or, D., Department of Environmental Sciences, Institute of Terrestrial Ecosystems, Soil and Terrestrial Environmental Physics, Swiss Federal Institute of Technology, Universitaeststr. 16, CH-8092 Zurich, Switzerland
Facilitators :
From page:
To page:
(
Total pages:
1
)
Abstract:
Evaporative losses from large water bodies may exceed 20% of water used in irrigated agriculture, with losses from reservoirs estimated at 50% of storage capacity. Prominent among proposed methods to curtail these evaporative losses are various forms of partial covers placed over water surfaces. Studies show that evaporation through perforated covers and from partially covered water surfaces exhibit nonlinear behavior, where rates of water loss are not proportional to uncovered surface fraction and are significantly affected by opening size and relative spacing. We studied evaporation from small water bodies under various perforated covers, extending the so-called diameter law to opening sizes in the range of 10-5 to 10-1 m. Contradicting claims concerning effects of openings and their arrangement on performance of evaporation barriers are analyzed on per opening and on per area mass losses. Our results help reconcile some classical findings invoking detailed pore-scale diffusion and simple temperature-based energetic behaviors. For fixed relative spacing, area-averaged evaporative flux density remains nearly constant across several orders of magnitude variations in opening size. For the scale of the experimental setup, we predict relative evaporation reduction efficiency for various configurations of perforated evaporation barriers. © 2010 by the American Geophysical Union.
Note:
Related Files :
Evaporative loss
flux measurement
Irrigated agriculture
Mass loss
Opening sizes
Orders of magnitude
perforation
water surface
Show More
Related Content
More details
DOI :
10.1029/2010WR009121
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21591
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:45
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Scientific Publication
Evaporation from partially covered water surfaces
46
Assouline, S., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, ARO Volcani Center, Bet Dagan 50250, Israel
Narkis, K., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, ARO Volcani Center, Bet Dagan 50250, Israel
Or, D., Department of Environmental Sciences, Institute of Terrestrial Ecosystems, Soil and Terrestrial Environmental Physics, Swiss Federal Institute of Technology, Universitaeststr. 16, CH-8092 Zurich, Switzerland
Evaporation from partially covered water surfaces
Evaporative losses from large water bodies may exceed 20% of water used in irrigated agriculture, with losses from reservoirs estimated at 50% of storage capacity. Prominent among proposed methods to curtail these evaporative losses are various forms of partial covers placed over water surfaces. Studies show that evaporation through perforated covers and from partially covered water surfaces exhibit nonlinear behavior, where rates of water loss are not proportional to uncovered surface fraction and are significantly affected by opening size and relative spacing. We studied evaporation from small water bodies under various perforated covers, extending the so-called diameter law to opening sizes in the range of 10-5 to 10-1 m. Contradicting claims concerning effects of openings and their arrangement on performance of evaporation barriers are analyzed on per opening and on per area mass losses. Our results help reconcile some classical findings invoking detailed pore-scale diffusion and simple temperature-based energetic behaviors. For fixed relative spacing, area-averaged evaporative flux density remains nearly constant across several orders of magnitude variations in opening size. For the scale of the experimental setup, we predict relative evaporation reduction efficiency for various configurations of perforated evaporation barriers. © 2010 by the American Geophysical Union.
Scientific Publication
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