J. Parra et D. Figueroa, Application of an advection-diffusion model for volcanic ash dispersion: The Hudson volcano eruption (1991) in Chile, REV MEX FIS, 45(5), 1999, pp. 466-471
To be able to estimate the thicknesses of the volcanic ash which is deposit
ed at the ground level, a numerical model of advection-diffusion type is ap
plied to the second eruptive phase of the Hudson volcano (45 degrees 54'S-7
2 degrees 58'W), Chile, initiated August 12, 1991. The eruption of plinian
character came from a crater of 800 m of diameter, producing columns of gas
es and ashes which reached a heights up to 18 Km. The application of a mode
l which considers processes of horizontal advection, turbulent diffusion, v
ertical deposition and the topography of the ground allows us to obtain the
spatial distribution of the isopachs which comparatively presents a simila
r disposition to those observed. The results obtained indicate a porce ntua
l relative error which vary from a 6% for ash thicknesses of about 150 cm t
o about a 30% for ash thicknesses of 10 cm.