Details of Harewood Plume Plotter

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

Stacks and buildings

Building measurements are taken from [1], except that the stack height has been increased from 70 to 80 metres.

The image below shows the layout of the stack and building modelled. North is at the top; colours and numbers indicate the height of the buildings and the stack:

Stack measurements

These are taken from [1], except that the stack height has been increased from 70 to 80 metres. The two stacks are modelled separately because they are more than 10 metres apart. The following applies to one of the stacks. The second stack is identical but is 4 metres east and 10 metres south of the first one.

• Stack location: 51.182879,-1.3735116.
• Stack height: 80 m.
• Stack diameter: 2.3 m.
• Stack gas exit velocity: 17.3 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 are taken from [1]:

Background levels

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

Weather data

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

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

References

1. Wheelabrator Harewood Waste-to-Energy facility Preliminary Environmental Information Report (PEIR): Appendix 7-1 -- Air Quality, AECOM. October 2019.