Mixing potential of a surface-mounted solar-powered water mixer (SWM) for controlling cyanobacterial blooms

Upadhyay, Sanjina; Bierlein, Kevin A.; Little, John C.; Burch, Michael D.; Elam, Kevin Patrick; Brookes, Justin D.

doi:10.1016/j.ecoleng.2013.09.032

Cited by 16 publications

(9 citation statements)

References 22 publications

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“…Generally, only the epilimnetic water is circulated and stratification is maintained. These mixers have thus a limited zone of influence and are unable to adequately mix entire lakes to effectively control cyanobacteria (Upadhyay et al 2013). In contrast, Hudnell et al (2010) showed that solar-powered circulation suppressed cyanobacterial densities in two reservoirs.…”

Section: Solar-powered Water Mixersmentioning

confidence: 99%

“…These devices are up-flow water circulators that pump water to the surface through an intake hose and transport it radially in all directions to improve surface flows (Upadhyay et al 2013). Generally, only the epilimnetic water is circulated and stratification is maintained.…”

Section: Solar-powered Water Mixersmentioning

confidence: 99%

“…Upadhyay et al (2013) determined the variable fluorescence ratio Fv/Fm, which is a good quantitative indicator of the quantum yield of photosystem II, before and after turning on the mixing device and observed a more depressed Fv/Fm at the surface compared to deeper in the water column before turning the device on. When the mixing was on, the difference over depth was much smaller, although the effect weakened at increasing distances.…”

Section: Determination Of Mixing Efficiencymentioning

confidence: 99%

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Artificial mixing to control cyanobacterial blooms: a review

et al. 2015

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Artificial mixing has been used as a measure to prevent the growth of cyanobacteria in eutrophic lakes and reservoirs for many years. In this paper, we give an overview of studies that report on the results of this remedy. Generally, artificial mixing causes an increase in the oxygen content of the water, an increase in the temperature in the deep layers but a decrease in the upper layers, while the standing crop of phytoplankton (i.e. the chlorophyll content per m 2 ) often increases partly due to an increase in nutrients entrained from the hypolimnion or resuspended from the sediments. A change in composition from cyanobacterial dominance to green algae and diatoms can be observed if the imposed mixing is strong enough to keep the cyanobacteria entrained in the turbulent flow, the mixing is deep enough to limit light availability and the mixing devices are well distributed horizontally over the lake. Both models and experimental studies show that if phytoplankton is entrained in the turbulent flow and redistributed vertically over the entire depth, green algae and diatoms win the competition over (colonial) cyanobacteria due to a higher growth rate and reduced sedimentation losses. The advantage of buoyant cyanobacteria to float up to the illuminated upper layers is eradicated in a wellmixed system.

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Section: Solar-powered Water Mixersmentioning

confidence: 99%

Section: Solar-powered Water Mixersmentioning

confidence: 99%

Section: Determination Of Mixing Efficiencymentioning

confidence: 99%

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Artificial mixing to control cyanobacterial blooms: a review

et al. 2015

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“…Artificial mixing is increasingly used to control cyanobacterial blooms while simultaneously inhibiting the release of nutrients from bottom sediments (Toffolon et al, 2013;Upadhyay et al, 2013). However, seasonal variations in rainfall patterns have complicated optimized management of the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Effects of rainfall patterns on water quality in a stratified reservoir subject to eutrophication: Implications for management

Huang

Wei-xing

et al. 2015

Science of The Total Environment

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“…A number of ecological engineering techniques have been used to control cyanobacteria blooms, such as altering the hydrology to enhance vertical mixing and flushing to counter the formation of cyanobacteria surface blooms (Li et al, 2013;Lundgren et al, 2013;Thackeray et al, 2006), the operation of a bypass to decrease nutrient loads and the transportation of phytoplankton from upstream areas to the reservoir (Yajima et al, 2013), and bio-manipulation by means of introducing fish to increase the grazing pressure on cyanobacteria. Unfortunately, application of these techniques in other reservoirs has several limitations; meanwhile, the reservoir management department also wants to use more effective technique to control cyanobacterial bloom in situ (Upadhyay et al, 2013).…”

Section: Introductionmentioning

confidence: 99%