Influence of bubble plumes on evaporation from non-stratified waters

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Title Influence of bubble plumes on evaporation from non-stratified waters
Author Helfer, Fernanda; Lemckert, Charles James; Zhang, Hong
Journal Name Journal of Hydrology
Year Published 2012
Place of publication Netherlands
Publisher Elsevier BV
Abstract Air–bubble plumes have been used primarily for water quality management through destratification; however, their impact on evaporation rates is yet to be formally quantified. In this paper, the influence of these systems on evaporation from water bodies is investigated. Evaporation, temperature, humidity and wind data were collected and analysed from a laboratory experiment for various air-flow rates injected into non-stratified water. It was found that aeration by air–bubble plumes increases evaporation in their direct vicinity. The factors involved in this increase were identified, and an empirical formula to quantify the loss of water under conditions of aeration was derived. To examine their overall impact on reservoirs, a temperate reservoir in Australia was taken as example for the application of this function. While laboratory data showed that aeration plays an important role in increasing loss of water from small non-stratified water bodies (such as water tanks) for real reservoirs, the effects of aeration on evaporation increase are insignificant. This is because the area of the plume to that of the reservoir is significantly less in real reservoirs than in water tanks. Additionally, due to thermal stratification conditions in real reservoirs, aeration by bubble plumes actually causes a slight reduction in evaporation due to reduction in reservoir surface temperatures as a result of the mixing process. Therefore, the net effect of air–bubble plume aeration on real reservoirs is a reduction in evaporation. However, this quantity was shown to be minor, and does not warrant the use of these systems for the sole purpose of reducing evaporation.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.jhydrol.2012.03.020
Copyright Statement Copyright 2012 Elsevier B.V.. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 438-439
Page from 84
Page to 96
ISSN 0022-1694
Date Accessioned 2012-05-01
Language en_US
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Water Resources Engineering
URI http://hdl.handle.net/10072/46754
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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