Details of Alton Plume Plotter

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

Stacks and buildings

Building measurements are taken from [1]. The image below shows the layout of the stacks 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]. These only describe one of the stacks. There is a second identical stack 1.7 m east and 5.0 m south of the first one:

• Stack location: 51.169187,-0.931171.
• Stack height: 80 m.
• Stack diameter: 1.9 m.
• Stack gas exit velocity: 15 m/s.
• Stack gas temperature: 140 °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: 0.2.

Emissions

The emission rates of pollutants (for each stack) were taken from [1], and are listed below:

Background levels

The background levels of pollutants are taken from [1]. These are:

Weather data

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

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

References

1. Alton Advanced Energy Recovery Facility - Appendix 8.3: Emissions Modelling. Fichtner. June 2020.