Abstract:TEPHRA is a two dimensional advection-diffusion model implemented by Bonadonna et al.  that describes the sedimentation process of particles from volcanic plumes.<br>
TEPHRA includes grain-size dependent diffusion law, particle density variation, a stratified atmosphere, and settling velocities function of Reynold’s number.<br>
It is written in C code using MPI commands for parallel computation.
Daily meteorological data provided by Aeronautical Military and volcanological parameters are processed by TEPHRA to simulate two different eruptive scenarios of Mt. Etna (corresponding to 1998 and 2002-03 Etna eruptions). The model outputs are plotted on maps and transferred to Civil Protection early in the morning.
Thanks to its parallel code Tehpra Model was ported to GRID infrastructure. The job submission process runs automatically through the use of a batch script that: 1)retrieves different input files and composes JDLs; 2)submits the job to GRID; 3)checks the status; 4)retrieves the output. Previous steps are made daily for many simulations (circa 17).
In order to obtain the outputs early in the morning we worked to minimize job-scheduling time by using special high-priority queue (Emergency Queue).
<br><br><b>Software requirements</b><br>Unix Operating System
<br>Gnu C compiler, Gcc
<br>HP GarbageC Library
<br>Message Passing Interface (MPI)