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Control of algal blooms in reservoirs with a curtain: a numerical analysis

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dc.contributor.author Asaeda, T
dc.contributor.author Pham, HS
dc.contributor.author Priyantha, DGN
dc.contributor.author Manatunge, JMA
dc.contributor.author Hocking, GC
dc.date.accessioned 2013-10-21T02:28:49Z
dc.date.available 2013-10-21T02:28:49Z
dc.identifier.uri http://dl.lib.mrt.ac.lk/handle/123/8558
dc.description.abstract Two vertical curtains, having depths to cover the epilimnion thickness, were installed across the Terauchi Dam Reservoir in the western island of Japan to curtail the nutrient supply from nutrient-rich inflows to the downstream epilimnion of the reservoir. The withdrawal level was also regulated to keep the downstream epilimnion away from the nutrient supply. This method markedly reduced algal blooming in the reservoir downstream of the curtains during spring and summer. The physical and biological processes in the reservoir ecosystem were analysed using the 2-D reservoir model DYRESM and chemical and biological submodels, to predict the water quality and algal species composition in the reservoir. The horizontal variability was maintained in the model by dividing the horizontal layer into parcels. Temperature, chlorophyll-a, soluble phosphorus, nitrate, ammonium, dissolved oxygen, biochemical oxygen demand, internal nitrogen, internal phosphorus were considered as state variables in the model. The simulated results revealed the mechanism of how algal blooming is reduced, during early spring high algal concentrations consume large amounts of nutrients, which reduces the nutrient supply to the downstream zone of the reservoir, whereas during late spring and summer, nutrient dispersion from the upstream epilimnion to the downstream epilimnion is curtailed by the curtains, markedly reducing algal blooming in the downstream zone.
dc.language en
dc.subject Algal bloom
dc.subject Curtain
dc.subject Entrainment
dc.subject Epilimnion
dc.subject Eutrophication
dc.subject Reservoir
dc.subject Riverine zone
dc.title Control of algal blooms in reservoirs with a curtain: a numerical analysis
dc.type Article-Abstract
dc.identifier.year 2001
dc.identifier.journal Ecological Engineering
dc.identifier.issue 3
dc.identifier.volume 16
dc.identifier.pgnos 395-404


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