Towards a biophysical understanding of observed performance of evaporation suppressant films applied to agricultural water storages - first analyses

Hancock, Nigel and Pittaway, Pam and Symes, Troy (2009) Towards a biophysical understanding of observed performance of evaporation suppressant films applied to agricultural water storages - first analyses. In: SEAg 2009: Agricultural Technologies in a Changing Climate, 13-16 Sep 2009, Brisbane, Australia.

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Abstract

The potential utility of monomolecular layers(‘monolayers’) and other surface film materials for the reduction of open water evaporation has long been argued. However, outside the laboratory, trials to quantify the effectiveness of artificial surface films have produced highly variable results after application to water surfaces, whether natural water bodies or managed farm storages. This paper briefly reviews the physical mechanisms involved in evaporation suppression and the biophysical literature on aquatic surface microlayers. The wide-ranging results from sixteen months of outdoor trough-scale and (simultaneous) replicated bucket-scale evaporation reduction trials are interpreted using biophysical measurements made on microlayer and immediate subsurface water samples taken from the experimental troughs. When the prevailing environmental conditions and other ancillary measurements are taken into account, plausible hypotheses arise to account for at least some of the observed trial-to-trial differences in evaporation reduction and surface film performance. These results have implications for both small-scale trailing of evaporation suppressants and the deployment and management of artificial surface film materials on agricultural water storages.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: No
Item Status: Live Archive
Additional Information: Authors retain copyright.
Depositing User: Assoc Prof Nigel Hancock
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 25 Jun 2010 06:08
Last Modified: 02 Jul 2013 23:54
Uncontrolled Keywords: monolayers; surface films; natural microlayers; evaporation mitigation; farm dams
Fields of Research (FOR2008): 03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
09 Engineering > 0999 Other Engineering > 099901 Agricultural Engineering
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
URI: http://eprints.usq.edu.au/id/eprint/8059

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