Chemical spill & HNS modelling

Chemical spill and HNS modelling you can act on

MarCast models the dispersion, fate and behaviour of hazardous and noxious substances (HNS) and other chemical spills in marine and coastal waters — so responders and planners can define safety zones, assess risk and protect people and the environment.

What we model

Chemical & HNS modelling for response and risk

HNS behaviour & fate

Model how hazardous and noxious substances spread, dissolve, evaporate or sink depending on their physical and chemical properties.

Plume & dispersion

Forecast how a chemical plume disperses in water and, where relevant, in the air, to inform safety zones.

Risk & exposure

Assess exposure to responders, the public and marine ecosystems for informed decision-making.

Rapid incident runs

Stand up a chemical spill scenario quickly during an emerging incident.

Contingency planning

Underpin chemical spill contingency plans and environmental risk assessments with defensible modelling.

Clear reporting

Export results for competent authorities, responders and stakeholders.

Common questions

Frequently asked

What is HNS modelling?

HNS modelling predicts the dispersion, fate and behaviour of hazardous and noxious substances spilled at sea — how they spread, dissolve, evaporate or sink — to support response and risk assessment.

How is chemical spill modelling different from oil spill modelling?

Chemical and HNS substances behave very differently from oil depending on their solubility, volatility and density, so the modelling accounts for a wider range of fate and behaviour processes.

Can you model both the water and air plume?

Modelling addresses dispersion in the marine environment and, where the substance volatilises, the airborne plume relevant to setting safety zones.

Is this available as software or a consultancy study?

Both — use the cloud-based software yourself, or commission a study from our team using the same validated engine.

Need this modelled?

Tell us about your incident type or planning need and we'll recommend the right MarCast software or service.

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