A novel Eulerian approach for modelling cyanobacteria movement: Thin layer formation and recurrent risk to drinking water intakes

Ndong, Mouhamed; Bird, David F.; Quang, Tri Nguyen; Kahawita, R.; Hamilton, David P.; Boutray, Marie Laure de; Prévost, Michèle; Dorner, Sarah

doi:10.1016/j.watres.2017.10.021

Cited by 26 publications

(17 citation statements)

References 38 publications

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“…George et al 12 proposed a concept of critical wind speed, and only when the actual wind speed is below the critical wind speed, Microcystis can float to the surface of the water, and sink to the deeper layers vice versa 13 . Critical wind speed was observed in different parts of the world, such as Nakdong River 14 , Lake Dianchi 15 , Mickeysloe Bay 16 , Lake Kinneret 17 , Lake Taihu 18 . The critical wind speed was different in each in-situ investigation.…”

Section: Introductionmentioning

confidence: 99%

Influence of wind and light on the floating and sinking process of Microcystis

Xue

Zhu

et al. 2022

Sci Rep

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The vertical migration and accumulation of Microcystis colonies is a critical process in algal bloom formation. This work explored the effect of wind and light intensity on the vertical migration of Microcystis colonies. The wind-driven currents, light-driven changes in mass density of colonies, and the effect of colony size was coupled to simulate the vertical motion of colonies via Ansys Fluent and MATLAB. Results showed that light causes Microcystis to exhibit a ‘day-sinking and night-floating’ (d-n) phenomenon, however, wind weakens the phenomenon by forming a turbulent drag force that inhibits the vertical movement of Microcystis. This study proposed a kinetic ratio-based method, that there is a specific equilibrium turbulent kinetic energy and when turbulent kinetic energy of the water body is greater than the equilibrium turbulent kinetic energy, the d-n phenomenon does not occur. For Lake Taihu, the wind-driven turbulent kinetic energy is usually greater than the equilibrium turbulent kinetic energy. Therefore, Microcystis colonies may not exhibit the d-n phenomenon. Our findings provide a new theoretical basis for current process-based models in simulating algal blooms in large shallow lakes.

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Section: Introductionmentioning

confidence: 99%

Influence of wind and light on the floating and sinking process of Microcystis

Xue

Zhu

et al. 2022

Sci Rep

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“…Large flows between all system compartments and rapid cycling rates may result in the emergence of chaos and a Type 5 bloom. horizontal advection along the water surface may concentrate these populations at lake margins (Ndong et al 2017). As such, we might expect sporadic blooms to be commonly observed in shoreline monitoring data (Pobel et al 2011).…”

Section: Type 1: Sporadic Bloomsmentioning

confidence: 97%

“…For example, moderate concentrations of cyanobacteria may accumulate at the surface during calm periods through vertical advection, and horizontal advection along the water surface may concentrate these populations at lake margins (Ndong et al . 2017). As such, we might expect sporadic blooms to be commonly observed in shoreline monitoring data (Pobel et al .…”

Section: A Set Of Operational Phytoplankton Bloom Definitions For Pre...mentioning

confidence: 99%

“…Many sporadic blooms may involve a combination of modest increases in total water column biomass coupled with physical processes that concentrate biomass at particular points in space and time (advective blooms). For example, moderate concentrations of cyanobacteria may accumulate at the surface during calm periods through vertical advection, and horizontal advection along the water surface may concentrate these populations at lake margins (Ndong et al 2017). As such, we might expect sporadic blooms to be commonly observed in shoreline monitoring data (Pobel et al 2011).…”

Section: Type 1: Sporadic Bloomsmentioning

confidence: 99%

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An operational framework for defining and forecasting phytoplankton blooms

Isles

Pomati

2021

Frontiers in Ecol & Environ

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Definitions based on thresholds of phytoplankton biomass or based on anomalies are common in the literature on "harmful algal blooms" (HABs). In such contexts, HABs are defined as having detrimental effects on one or more target species or communities (WebTable 1; Smayda 1997). HAB definitions are generally associated with specified densities of potentially toxic species, chlorophyll concentrations,

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“…This model was used to calibrate physiological parameters for the phytoplankton. Recently, the work of Ndong et al [80] has shown a sophisticated 2D Eulerian frame model to evaluate the phototactic behavior effect of cyanobacteria, as well as the effects of light and wind on the distribution of cyanobacteria and estimate coupled effects of biological and physical factors on cyanobacteria.…”

Section: Deterministic Versus Probabilisticmentioning

confidence: 99%

An Overview of Cyanobacteria Harmful Algal Bloom (CyanoHAB) Issues in Freshwater Ecosystems

Benayache¹,

Nguyen-Quang²,

Hushchyna³

et al. 2019

Limnology - Some New Aspects of Inland Water Ecology

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This chapter will present an overview of cyanobacterial harmful algal blooms (cyano-HABs) and biotic and abiotic factors, as well as various aspects associated with these worldwide ecological bursts. The exact causes of the cyanoHABs are still not well defined, but eutrophication and climate change (temperature increase, light intensity variation, etc.) are the two assumed main factors that may promote the proliferation and expansion of cyanobacterial blooms. However, these premises need to be profoundly investigated as the optimal combination of all factors such as increased nutrient loading, physiological characteristics of cyanobacterial species, and climate effects which could lead to the blooming pattern will require robust modeling approaches to predict the phenomena. Negative issues associated with cyanoHABs are diverse including the toxic products (cyanotoxins) released by certain taxa which can damage the health of humans and animal habitats around the related watershed as well as generate a huge water quality problem for aquatic industries.

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A novel Eulerian approach for modelling cyanobacteria movement: Thin layer formation and recurrent risk to drinking water intakes

Cited by 26 publications

References 38 publications

Influence of wind and light on the floating and sinking process of Microcystis

Influence of wind and light on the floating and sinking process of Microcystis

An operational framework for defining and forecasting phytoplankton blooms

An Overview of Cyanobacteria Harmful Algal Bloom (CyanoHAB) Issues in Freshwater Ecosystems

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