SNAP, the Severe Nuclear Accident Programme is a lagrangian type atmospheric dispersion model specialized on modelling dispersion of radioactive debris. A model description can be found at this link.
SNAP needs meteorological driver data from NWP models in sigma or eta-hybrid model-levels, in the netcdf format. The minimum list of parameters are for the surface layer:
- surface-air-pressure
- precipitation (eventually split into convective and large-scale)
- x- and y-wind-10m
And for the model layers:
- x- and y-wind
- air-temperature or potential-temperature
- ap and b hybrid level values, or sigma level values
Parameter names can be specified in readfield_nc.f90.
And example on how to set up downloading of freely available meteorological data from the NOAA GFS model can be found under src/naccident/examples/gfs/
SNAP requires the following libraries and programs to be installed for compilation
- fortran77/90 compiler, e.g. gfortran or ifort
- NetCDF (netcdf > 4.1.1)
- NetCDF-fortran
- Python3 (optional)
- git (optional)
- fimex (optional)
Create a file current.mk in the src directory. Use e.g the file
ubuntuXenial.mk
as a template. The most important parameters to modify are NCDIR and
BINDIR, where the final files will be installed to.
THE MIINC and MILIB should be uncommented.
In the src directory run then:
make installThis will install bsnap_naccident to BINDIR. Run SNAP using
the command
bsnap_naccident snap.inputExamples of snap.input can be found in the directory src/naccident/examples/.
The master branch in git is used for development. Stable versions are tagged as 'vX.YY.ZZ'. Releases should also have a DOI for citation, see https://doi.org/10.5281/zenodo.1155159 . For the user-interface snappy, we use tags like 'snappy-vX.YY.ZZ' with independent version numbers. Other tags are used internally.
The build system uses automatic versioning based on git tags and revision numbers and embeds this into the resulting program. If git or python3 is unavailable, this logic should be bypassed by setting the environment variable VERSION to some value, e.g.
env VERSION="some_version_number" make installSNAP: Servere Nuclear Accident Programme
Copyright (C) 1992-2023 Norwegian Meteorological Institute
SNAP is free software: you can
redistribute it and/or modify it under the terms of the
GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program, i.e. see COPYING for more information.
If not, see <https://www.gnu.org/licenses/>.
