Continuous discharges to water from industry, landfills, sewage treatment plants, etc. are a persistent source of pollution and can be harmful to the ecosystem in the receiving recipient. Such discharges must therefore have a permit in accordance with the Pollution Control Act. Emission applications must contain information about the recipient and what effects the emissions may have. It includes information on the state of the environment, expected spread and effect in the recipient, and an assessment of whether the discharge may impair biodiversity.
Acona and Ranold have developed a model that calculates the spread, dilution, storage and calculation of the near zone of one or more discharges to a water body. The model can be used to assess the environmental consequences of a discharge before it is discharged into the recipient. Different scenarios can be analyzed. This provides an opportunity to adjust the discharge and possibly the discharge point up the recipient recipient's vulnerability, and thus reduce the risk of negative impact.
The model provides the company with the information they need in connection with an application for a discharge permit under the Pollution Control Act.
The model is a combined integral and particle tracking model, and has been named
CIPMO (Combined Integral and Particle Model). The near zone is built up of an integral model and the distant zone of a modified particle tracking model (LADIM, developed by the Institute of Marine Research). The combination ensures that both the near and far field processes are solved sufficiently. The model collects data from Open Source hydrodynamic models with high spatial and temporal resolution for salinity, current and temperature. Measured data can be integrated into the model.
The model has been developed with support from the Research Council and shows good results in relation to measurements from field studies.
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