Search Results - "Johansen, Øistein"

Droplet breakup in subsea oil releases – Part 2: Predictions of droplet size distributions with and without injection of chemical dispersants by Johansen, Øistein, Brandvik, Per Johan, Farooq, Umer

“…•Data from a new experimental facility for droplet breakup (Paper I).•Theory for droplet breakup and derivation of a model for droplet size prediction.•Model…”
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Natural dispersion revisited by Johansen, Øistein, Reed, Mark, Bodsberg, Nils Rune

“…•Natural dispersion is a fundamental process defining the lifetime of marine oil spills.•The commonly used model to day rests on questionable empirical and…”
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Droplet breakup in subsurface oil releases – Part 1: Experimental study of droplet breakup and effectiveness of dispersant injection by Brandvik, Per Johan, Johansen, Øistein, Leirvik, Frode, Farooq, Umer, Daling, Per S.

“…•Presents a unique experimental facility for studying subsurface releases of oil.•Droplets sizes monitored as a function of release conditions and oil…”
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Normalized concept for modelling effective soil thermal conductivity from dryness to saturation by He, Hailong, Noborio, Kosuke, Johansen, Øistein, Dyck, Miles F., Lv, Jialong

“…Effective soil thermal conductivity (λ eff) is a critical parameter for environmental and earth science as well as engineering applications. Models to predict…”
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Large-scale basin testing to simulate realistic oil droplet distributions from subsea release of oil and the effect of subsea dispersant injection by Brandvik, Per Johan, Davies, Emlyn, Leirvik, Frode, Johansen, Øistein, Belore, Randy

“…Small-scale experiments performed at SINTEF, Norway in 2011–12 led to the development of a modified Weber scaling algorithm. The algorithm predicts initial oil…”
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Modelling of oil thickness in the presence of an ice edge by Nordam, Tor, Litzler, Emma, Skancke, Jørgen, Singsaas, Ivar, Leirvik, Frode, Johansen, Øistein

“…Oil slick thickness is a key parameter for the behaviour of oil spilled at sea. It influences evaporation and entrainment, viable response options, and the…”
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Combined releases of oil and gas under pressure; the influence of live oil and natural gas on initial oil droplet formation by Brandvik, Per Johan, Storey, Chris, Davies, Emlyn John, Johansen, Øistein

“…Both oil droplets and gas bubbles have simultaneously been quantified in laboratory experiments that simulate deep-water subsea releases of both live oil…”
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Subsea dispersants injection (SSDI), effectiveness of different dispersant injection techniques – An experimental approach by Brandvik, Per Johan, Johansen, Øistein, Leirvik, Frode, Krause, Daniel F., Daling, Per S.

“…The main objective with this study has been to study injection techniques for subsea dispersant injection (SSDI) to recommend techniques relevant for both…”
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Method for generating parameterized ecotoxicity data of dispersed oil for use in environmental modelling by Nordtug, Trond, Olsen, Anders Johny, Altin, Dag, Meier, Sonnich, Overrein, Ingrid, Hansen, Bjørn Henrik, Johansen, Øistein

“…► Development of methodology to enable parameterization of toxicity data following exposure of test organisms to oil dispersions. ► Improving the value of…”
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Intercomparison of oil spill prediction models for accidental blowout scenarios with and without subsea chemical dispersant injection by Socolofsky, Scott A., Adams, E. Eric, Boufadel, Michel C., Aman, Zachary M., Johansen, Øistein, Konkel, Wolfgang J., Lindo, David, Madsen, Mads N., North, Elizabeth W., Paris, Claire B., Rasmussen, Dorte, Reed, Mark, Rønningen, Petter, Sim, Lawrence H., Uhrenholdt, Thomas, Anderson, Karl G., Cooper, Cortis, Nedwed, Tim J.

“…•We compare predictions from oil spill models for a prototype subsea blowout.•The comparison matrix varied the gas to oil ratio, depth, current speed, and…”
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Spreading of waxy oils on calm water by Brönner, Ute, Johansen, Øistein, Leirvik, Frode, Nordam, Tor, Sørheim, Kristin R.

“…The objective of this paper is to provide a simple extension of the much-used gravity spreading model for oil on calm water to account for the spreading…”
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Development and verification of deep-water blowout models by Johansen, Oistein

“…Modeling of deep-water releases of gas and oil involves conventional plume theory in combination with thermodynamics and mass transfer calculations. The…”
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Shedding from chemically-treated oil droplets rising in seawater by Davies, Emlyn John, Dunnebier, Dorien A.E., Johansen, Øistein, Masutani, Stephen, Nagamine, Ike, Brandvik, Per Johan

“…The degree to which droplet shedding (tip-streaming) can modify the size of rising oil droplets has been a topic of growing interest in relation to subsea…”
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DeepSpill––Field Study of a Simulated Oil and Gas Blowout in Deep Water by Johansen, Øistein, Rye, Henrik, Cooper, Cortis

“…With the world’s increasing demand for oil and gas and dwindling onshore reserves, the need to exploit oil and gas has moved into deep water. This move brings…”
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DeepBlow – a Lagrangian Plume Model for Deep Water Blowouts by Johansen, Oe

“…This paper presents a sub-sea blowout model designed with special emphasis on deep-water conditions. The model is an integral plume model based on a Lagrangian…”
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Development of a Numerical Model for Calculating Exposure to Toxic and Nontoxic Stressors in the Water Column and Sediment from Drilling Discharges by Rye, Henrik, Reed, Mark, Frost, Tone Karin, Smit, Mathijs G. D, Durgut, Ismail, Johansen, Øistein, Ditlevsen, May Kristin

“…EDITOR'S NOTE: This is 1 of 5 papers reporting on the results of a 4-year project to develop an environmental risk-based decision support tool, to assist the…”
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Biotransformation and dissolution of petroleum hydrocarbons in natural flowing seawater at low temperature by BRAKSTAD, Odd G, BONAUNET, Kristin, NORDTUG, Trond, JOHANSEN, Øistein

“…The objective of this study was to establish methods for controlled studies of hydrocarbon depletion from thin oil films in cold natural seawater, and to…”
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Oil Spill Modeling towards the Close of the 20th Century: Overview of the State of the Art by Reed, Mark, Johansen, Øistein, Brandvik, Per Johan, Daling, Per, Lewis, Alun, Fiocco, Robert, Mackay, Don, Prentki, Richard

“…The state-of-the-art in oil spill modeling is summarized, focusing primarily on the years from 1990 to the present. All models seek to describe the key…”
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Numerical model for estimation of pipeline oil spill volumes by Reed, Mark, Emilsen, Morten H., Hetland, Ben, Johansen, Øistein, Buffington, Sharon, Høverstad, Boye

“…The Minerals Management Service Pipeline Oil Spill Volume Estimation Model (POSVEM) is a computer-based methodology to estimate discharges from seafloor…”
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Norwegian Testing of Emulsion Properties at Sea––The Importance of Oil Type and Release Conditions by Daling, Per S, Moldestad, Merete Øverli, Johansen, Øistein, Lewis, Alun, Rødal, Jon

“…This paper is a review of the major findings from laboratory studies and field trials conducted in Norway in recent years on the emulsification of oils spilled…”
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