Details of Crymlyn Burrows Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Crymlyn Burrows version of Plume Plotter.

Stacks and buildings

Building measurements are taken from the building plans and aerial photos. This image shows the layout of the stack and buildings modelled. North is at the top; colours and numbers indicate the height of the buildings and the stack.

Stack measurements

All of these are taken from [1] except the stack location, which was identified from aerial photos:

• Stack location: 51.624523,-3.8793084.
• Stack height: 40 m.
• Stack diameter: 0.95 m.
• Stack gas exit velocity: 18.2 m/s.
• Stack gas temperature: 136 °C.

The following values are used for albedo, Bowen ratio, and roughness length. Roughness length is as specified in [1]:

• Albedo: 0.2.
• Bowen ratio: 1.
• Roughness length: 0.5.

Emissions

The emission rates of pollutants are calculated by multiplying the average emission concentration from the incinerator's emission reports (in 2008) by the normalised flow rate. The latter was estimated as 0.7 times the actual flow rate:

Background levels

The background levels of pollutants are only estimated:

Weather data

Weather data is taken from METAR reports from a local airport: Cardiff.

Upper air data is the latest reported by the Camborne upper air station.

References

1. Estimating Particulate Exposure from Modern Municipal Waste Incinerators in Great Britain, Philippa Douglas et al., Environ. Sci. Technol. 2017, 51, 7511-7519.