HAZMAP-2.4.4: a code to model the diffusion, transport and sedimentation of small particles

Abstract

HAZMAP-2.4.4 is a code for the solution of the equation of diffusion, transport and sedimentation of small particles in order to model the dispersion of ash generated by a convective column. The model simplifies the advection-diffusion-sedimentation equation for volcanic ash transport in the atmosphere from three to two spatial dimensions and uses a semi-analytical approach that greatly reduces the required computer time and memory. The model needs the definition of the physical system (spatial distribution of the point sources, total erupted mass, settling velocity model, wind velocity profile, atmospheric turbulent diffusion coefficients) and of a computational grid.

This code was first edited in 2007 and updated in 2016. HAZMAP-2.4.4 is developed and maintained by the Istituto Nazionale di Geofisica e Vulcanologia (INGV).