MILORD

MILORD is a 3-D long-range Lagrangian particle model. Transport and dispersion of pollutants or tracers are simulated by following the trajectories of virtual particles, each representing a finite mass and/or activity of the substance considered, in a three dimensional wind field (ECMWF analyses). Diffusion due to turbulence is prescribed by integrating the Langevin equation for displacement. Depletion of the mass particle by dry and wet deposition and radioactive decay or chemical transformation are accounted for by exponential reduction equations. A post-processing analysis package allows calculating concentration and deposition over specific locations or over a grid. The model is designed to work requiring the minimum information available from typical data sets: topography, 3-D wind at standard pressure levels and precipitation. It can use any kind of gridded input data, having any time and space resolution and source configuration. It is able to treat area, line or point sources, time and space depending emissions, where a plume rise can be assigned

Long range simulation of transport, dispersion and deposition (radioactive decay or first order chemical reactions are included) of tracers for continuous or accidental releases. Typical simulations cover regional to long-range area scale, from hundreds to thousand kilometres, and time period ranging from one day to months

responsible: 
Silvia Trini Castelli
bibliographic references: 

Trini Castelli S., 2012. MILORD - reload. Model for the Investigation of Long Range Dispersion. Internal Report ISAC-TO/02-2012, 10 September 2012, pages 28

Anfossi D., S. Trini Castelli, E. Ferrero, G. Tinarelli, 1998. Results of MILORD simulations of ETEX-I. ATMES II - Evaluation of Long-range Dispersion Models using 1st ETEX Release. S. Mosca, R. Bianconi, R. Bellasio, G. Graziani and W. Klug editors. EUR 17756 EN, 519-522

Desiato F., D.Anfossi, S. Trini Castelli, E. Ferrero, G. Tinarelli, 1998. The role of wind field, mixing height and horizontal diffusion investigated through two Lagrangian particle models. Atmospheric Environment, 32, 4157-4165

Desiato F., D.Anfossi, S. Trini Castelli, E. Ferrero, G. Tinarelli, 1998 Intercomparison of two Lagrangian particle models with ETEX tracer data. Air Pollution Modelling and its Applications XII, S.E. Gryning and N. Chaumerliac eds., Plenum Press, New York, 267-273

Anfossi D., F. Desiato, S. Trini Castelli, E. Ferrero, G. Tinarelli, 1997. The role of horizontal diffusion and mixing height parameterization in the ETEX long-range dispersion modelling. Proceedings of ETEX Symposium on Long-range Atmospheric Transport, Model Verification and Emergency Response, Vienna (Austria), 13-16 May, 1997, 187-190

Anfossi D., Sacchetti D., Trini Castelli S., 1995. Development and Sensitivity Analysis of a Lagrangian Particle Model for Long Range Dispersion. Environmental Software