Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5379
Authors: Folch, A.* 
Costa, A.* 
Macedonio, G.* 
Title: FALL3D: A computational model for transport and deposition of volcanic ash
Issue Date: 2009
Series/Report no.: /35(2009)
DOI: 10.1016/j.cageo.2008.08.008
URI: http://hdl.handle.net/2122/5379
Keywords: Volcanic ash
Fallout
Computational model
FORTRAN code
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
05. General::05.01. Computational geophysics::05.01.99. General or miscellaneous 
Abstract: FALL3D is a3-Dtime-dependent Eulerian model for the transport and deposition of volcanic ashesandlapilli.Themodelsolvestheadvection–diffusion–sedimentation (ADS)equationonastructuredterrain-followinggridusingasecond-orderfinite differences(FD)explicitscheme.Differentparameterizationsfortheeddydiffusivity tensor andfortheparticleterminalsettlingvelocitiescanbeused.Thecode,writtenin FORTRAN90, isavailableinbothserialandparallelversionsforWindowsand Unix/Linux/MacXoperatingsystems(OS).Aseriesofpre-andpost-processutility programs andOS-dependentscriptstolaunchthemarealsoincludedinthe FALL3D distributionpackage.Althoughthemodelhasbeendesignedtoforecastvolcanicash concentrationintheatmosphereandashloadingatground,itcanalsobeusedtomodel thetransportofanykindofairbornesolidparticles.Themodelinputsare meteorologicaldata,topography,grain-sizedistribution,shapeanddensityofparticles, and massrateofparticleinjectedintotheatmosphere.Optionally, FALL3D can be coupledwiththeoutputofthemeteorologicalprocessor CALMET, adiagnosticmodel whichgenerates3-Dtime-dependentzero-divergencewindfieldsfrommesoscale forecastsincorporatinglocalterraineffects.The FALL3D model canbeatoolfor short-termashdepositionforecastingandforvolcanicfallouthazardassessment.Asan example,anapplicationtothe22July1998Etnaeruptionisalsopresented
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