Chapter 4 - Dispersion Modelling
Table of contents
- Introduction
- Requirements for modelling
- Fitness for purpose criteria
- Atmospheric transport and advection frameworks
- Gaussian dispersion
- Lagrangian
- Eulerian
- Empirical and semi-empirical models
- Available approaches for airport-scale modelling
- Key dispersion issues
- Initial dispersion
- Small scale atmospheric transport and diffusion
- The effect of landing and take-off (LTO) aircraft operations on plume motion
- Effect of the aircraft wake
- Surface characteristics
- Recommendations for further model development and application
- Atmospheric chemistry
- NO to NO2 conversion
- Parameterisation of NOX chemistry in simple models
- Model inter-comparison
- MIC study objectives
- Inputs
- Emissions
- Background concentration
- Meteorology
- Outputs
- Receptor points
- Contour plots
- Source apportionment
- Candidate airport dispersion models
- Netcen airport dispersion model
- Cambridge University application of the EDMS model
- ADMS-Airport dispersion model developed by CERC
- London Toolkit Airport Model developed by ERG
- LASPORT model applied by Manchester Metropolitan University
- Validation of candidate models with measurements at monitoring sites in the vicinity of Heathrow
- Scatter plots
- Wind speed dependence
- Polar plots for NOX
- Contour plots
- Transect plots
- Runway alternation
- Model response of NO2 to a change in NOX concentration
- Airport contribution
- Model uncertainty
- Assessment of model performance
- Looking ahead - future uncertainties
- Source apportionment in 2020
- Primary NO2
- Future ozone concentrations
- Meteorological data
- Future uncertainty in NO2
- Overall assessments of future uncertainty
- Panel 1 conclusions and model recommendations
- Panel 1 recommendations
