Interplay between ambient surface water mixing and manipulated hydraulic flushing: Implications for harmful algal bloom mitigation

Spatio-temporal variations of GHG emissions from surface water of Xiangxi River in Three Gorges Reservoir region, China

“…For riverine restoration and control of algal blooms in Xiangxi River, several proposed mitigation approaches have focused on creating fluctuant hydraulic conditions, such as management of reservoir inflows and hydraulic flushing rates. Hydraulic flushing plays a major role in regulating primary productivity, via physical displacement of cells and resulting changes in environmental conditions, which has been successfully used for algal bloom mitigation in Lake Granbury (USA) (Lundgren et al, 2013).…”

Influence of alum on cyanobacterial blooms and water quality of earthen fish ponds

“…Depending on their results, the present study was conducted using traditional Egyptian treatment without application of post-fertilization. Eutrophication of water results in dense algal blooms causing changes in water quality which are deleterious to fish populations or may be directly toxic to other aquatic organisms (Shilo 1967;Bernardi and Giussani 1990;Sivonen and Jones 1999;Lundgren et al 2013). Lu et al (2006) stated that nutrient reduction from internal and external loading is the ultimate way to control eutrophication and, consequently, blue-green algal blooms.…”

“…Blue-green algal blooms are one of the consequences of eutrophication in freshwaters caused by increasing anthropogenic inputs of nutrients. Such blooms lower water transparency, add poor taste and odor, and eliminate certain fish from the system which may result in an abundance of undesired fish species (Cooke et al 1977;Lundgren et al 2013). Prokaryotic blue-green algae (Cyanophyta) such as Microcystis and Anabaena are frequently observed as blooms in fish ponds.…”

Study of the application of the water-lifting aerators to improve the water quality of a stratified, eutrophicated reservoir

“…Summer stratification generally favors potentially toxic cyanobacterial biomass due to their higher affinity for nutrients compared to other phytoplankton species and their ability to adjust their buoyancy and therefore exploit nutrients, light and inorganic carbon resources over a wider range (Liu et al, 2012;Wynne et al, 2008). 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).…”