Effects of a suspended shade cloth cover on water quality of an agricultural reservoir for irrigation

Maestre-Valero, J. F. and Martinez-Alvarez, V. and Gallego-Elvira, B. and Pittaway, P. (2011) Effects of a suspended shade cloth cover on water quality of an agricultural reservoir for irrigation. Agricultural Water Management, 100 (1). pp. 70-75. ISSN 0378-3774

Abstract

Water availability and quality are two fundamental factors for agriculture in arid and semi-arid regions. This study evaluates the effects of a water-permeable, Suspended Shade Cloth Cover (SSCC), on the quality of water stored in an on-farm Agricultural Water Reservoir (AWR). Water quality (water temperature, electrical conductivity, chlorophyll-a concentration, dissolved oxygen concentration and water turbidity) and environmental (evaporation, rainfall, wind speed and solar radiation) parameters were measured over a 2-year period in a typical AWR located in south-eastern Spain. In the first year, the AWR remained uncovered and the behaviour was quasi-isothermal. In the second year, installing a SSCC induced a thermal gradient in the water that reached a maximum temperature difference of 12C during summer. The lack of turbulence under the cover and the reduction in photosynthesis (95% reduction of chlorophyll-a) reduced the concentration of dissolved oxygen to 1.5 mg L−1, and turbidity from 40 NTU at installation to less than 1 NTU. The positive balance between rainfall and evaporation during the second year reduced the electrical conductivity of the water by 8.2%. The improvement in water quality associated with the installation of a SSCC increases the efficiency of drip irrigation systems by reducing the water filtering requirements, the likelihood of emitter clogging, and the risk of irrigation-induced salinity.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to paper due to publisher copyright restrictions.
Depositing User: Dr Pamela Pittaway
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 12 Oct 2011 07:13
Last Modified: 25 Aug 2014 21:34
Uncontrolled Keywords: small dams; drip irrigation; electrical conductivity; chorophyll-a; dissolved oxygen concentration
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
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 > 960999 Land and Water Management of Environments not elsewhere classified
Identification Number or DOI: doi: 10.1016/j.agwat.2011.08.020
URI: http://eprints.usq.edu.au/id/eprint/19698

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