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Ali, W. (author), Kirichek, Alex (author), Chassagne, C. (author)In this work a high-magnification digital video camera in combination with a settling column is used to study in a first part the influence of the amount of flocs transferred into the settling column on their settling velocity. In a second part, the setup was used to study the properties of flocs prepared at different clay concentrations but at...journal article 2024
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Alhaddad, S.M.S. (author), Suleman, M. (author), Kirichek, Alex (author), Chassagne, C. (author)Coandă-effect-based collection stands out as the foremost technology in polymetallic-nodule mining due to the absence of direct contact between the collector and the ocean floor. Yet, this collection method disturbs the ocean floor, and minimizing such disturbance is crucial from an environmental viewpoint. To this end, a solid understanding of...journal article 2024
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- Kirichek, Alex (author), Bampatzeliou, A. (author), Gebert, J. (author), Chassagne, C. (author), Ohle, Nino (author), Schmekel, Uli (author) abstract 2023
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Safar, Z. (author), Deng, Zhirui (author), Chassagne, C. (author)In the present study, we aim to parameterize a flocculation model, based on a logistic growth equation, by conducting laboratory experiments. The flocculation experiments are performed using two types of natural sediments and different flocculating agents: salt (monovalent and divalent), extracellular polymeric substances, and living and dead...journal article 2023
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Tang, Yuchen (author), Zhang, Fengbo (author), Bogaard, T.A. (author), Chassagne, C. (author), Ali, Zeeshan (author), Bandyopadhyay, Sulalit (author), Foppen, J.W.A. (author)Particle tracers are sometimes used to track sources and sinks of riverine particulate and contaminant transport. A potentially new particle tracer is ~200 nm sized superparamagnetic silica encapsulated DNA (SiDNAFe). The main objective of this research was to understand and quantify the settling and aggregation behaviour of SiDNAFe in river...journal article 2023
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A new setup to study the influence of plant growth on the consolidation of dredged cohesive sedimentBarciela Rial, M. (author), Saaltink, Remon M. (author), van Kessel, Thijs (author), Chassagne, C. (author), Dekker, Stefan C. (author), de Boer, Hugo J. (author), Griffioen, Jasper (author), Wassen, Martin J. (author), Winterwerp, J.C. (author)Dredged cohesive sediment is progressively being used for wetland construction. However, little is known about the effect of plant growth during the self-weight consolidation of this sediment. In order to check the feasibility of such a study, a new experimental setup has been constructed. As an example, the effect of Phragmites australis on the...journal article 2023
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Deng, Z. (author), He, Qing (author), Manning, Andrew J. (author), Chassagne, C. (author)The interactions between organic and inorganic particles in the context of flocculation is an on-going topic of research. Most current researches do not distinguish between the effects of EPS (produced by microorganisms) and living microorganisms (like algae). In this study, the effect of salinity, EPS and living algae on sediment...journal article 2023
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Shakeel, A. (author), Zander, F. (author), Gebert, J. (author), Chassagne, C. (author), Kirichek, Alex (author)The presence of clay-organic flocs in cohesive mud results in a complex rheological behavior of mud, including viscoelasticity, shear-thinning, thixotropy and two-step yielding. In this study, the effect of microbial degradation of organic matter on the rheological properties of mud samples, collected from different ports, was examined. The mud...journal article 2022
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Kirichek, Alex (author), Shakeel, A. (author), Chassagne, C. (author), Gebert, J. (author)In some ports and waterways, hindered (delayed) settling of mud suspended in the water phase can be detected. Hindered settling phenomena are typically linked to a combination of sediment properties, suspended sediment concentration or density, hydrodynamic conditions, presence or absence of organic bridging between mud particles and the...conference paper 2022
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Ali, W. (author), Enthoven, D.H.B. (author), Kirichek, Alex (author), Helmons, R.L.J. (author), Chassagne, C. (author)For green energy transition, the industry seeks alternative resources for nickel and cobalt, the main ingredients for energy storage devices and other applications. Polymetallic nodules lying at the abyssal plain are rich in these mineral resources, which leads to an increased interest in deep-sea mining (DSM) of polymetallic nodules. During the...conference paper 2022
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Safar, Z. (author), Chassagne, C. (author), Rijnsburger, S. (author), Ibanez Sanz, M. (author), Manning, A.J. (author), Souza, A.J. (author), van Kessel, T. (author), Horner-Devine, A. (author), Flores, R. (author), McKeon, M. (author), Pietrzak, J.D. (author)An 11 hours survey was performed on the 17th of September 2014 in the Rhine Region Of Freshwater Influence (Rhine-ROFI) about 10 km downstream of the mouth of the Rotterdam Waterway during calm weather conditions. Suspended Particle Matter (SPM) measurements were performed during a full tidal cycle, near the seabed, at neap tide, and samples...journal article 2022
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Shakeel, A. (author), Ali, W. (author), Chassagne, C. (author), Kirichek, Alex (author)Kaolin based suspensions have wide range of applications such as slurry wall, drilling fluids, adhesives, cosmetics, refractories and pharmaceuticals, due to their abundance in nature, low cost and non-swelling nature. On the other hand, the unique properties (i.e., biodegradability) of biopolymers make them suitable candidate for variety of...journal article 2022
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Ali, W. (author), Enthoven, D.H.B. (author), Kirichek, Alex (author), Chassagne, C. (author), Helmons, R.L.J. (author)Flocculation between inorganic sediment, salt ions and microscopic organic<br/>matter present in the marine environment might play an important role in the<br/>dynamics of turbidity currents. The ability to predict, understand, and potentially<br/>leverage the effect of flocculation on turbidity currents will help to minimize the<br/>impact of...journal article 2022
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Zander, F. (author), Shakeel, A. (author), Kirichek, Alex (author), Chassagne, C. (author), Gebert, J. (author)Purpose<br/>Sediment organic matter (SOM) influences settling and thus the rheological behavior of suspended particles by enhancing flocculation or reducing surface charges by forming organo-mineral complexes that facilitate particle–particle interactions in consolidating sediments. It was, therefore, assumed that the microbial degradation of...journal article 2022
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Shakeel, A. (author), Zander, F. (author), de Klerk, Jan‑Willem (author), Kirichek, Alex (author), Gebert, J. (author), Chassagne, C. (author)Purpose<br/>The presence of organic matter in cohesive sediment results in the formation of clay-organic flocs, which eventually impart complex rheological behavior including shear-thinning, viscoelasticity, thixotropy and two-step yielding to mud. In this study, the influence of microbial degradation of sediment organic matter on the...journal article 2022
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Deng, Zhirui (author), Huang, Dong (author), He, Qing (author), Chassagne, C. (author)Sediment is found throughout the world’s alluvial plain rivers, estuarine coasts and adjacent seas and is thereby a key factor in major ecosystems. Suspended mineral sediment can affect the biological activity of microorganisms and plants, by reducing light penetration in the water column or by binding to organic matter. Biological processes...review 2022
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Shakeel, A. (author), Chassagne, C. (author), Bornholdt, Jasper (author), Ohle, Nino (author), Kirichek, Alex (author)The nautical bottom (i.e., the level at which contact with a ship’s keel causes either damage or unacceptable effects on controllability and manoeuvrability of a ship) should be associated to a measurable physical characteristic. Bulk density is typically used as a criterion for nautical bottom by many ports worldwide. However, the rheological...journal article 2022
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Ali, W. (author), Chassagne, C. (author)In the present article two flocculation models, given in Chassagne (2021) (LG model) and Winterwerp (1998) (S model) are compared. Both models give the time evolution dL/dt where L is the size of a particle undergoing flocculation, and t is the time. The LG model is based on logistic growth theory, whereas the S model is based on the theory...journal article 2022
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- Shakeel, A. (author), Kirichek, Alex (author), Chassagne, C. (author) abstract 2021
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- Shakeel, A. (author), Kirichek, Alex (author), Chassagne, C. (author) abstract 2021