Define a namelist for gridded configurations¶

Configure the spatial grid with the NAM_PGD_GRID namelist and the namelist associated with your specific grid.
http://www.umr-cnrm.fr/surfex//spip.php?article42

For French applications, we recommend to use the Lambert 93 projection with the following example:

&NAM_PGD_GRID CGRID = 'IGN'
/
&NAM_IGN
CLAMBERT='L93'
XCELLSIZE=500
XX_LLCORNER= (to complete)
XY_LLCORNER= (to complete)
NCOLS= (to complete)
NROWS= (to complete)
/

XX_LLCORNER and XY_LLCORNER are the coordinates of the edges of the lower left cell (be careful, not the cells centers)
NCOLS is the number of columns (= length of the X dimension)
NROWS is the number of rows (= length of the Y dimension)

To force the altitude and compute the slope angle inside SURFEX :
&NAM_ZS
YZS = "FORCING.nc",
YZSFILETYPE="NETCDF",
LEXPLICIT_SLOPE = .TRUE.,
LIMP_ZS = .TRUE.
/
&NAM_ZS_FILTER
NZSFILTER = 0
/
To activate shadows routines (optional) :
&NAM_IO_OFFLINE
LSHADOWS_SLOPE = .TRUE. ,
LSHADOWS_OTHER = .TRUE. ,

/
To not disturb the initialization procedure by vertical interpolations and to correctly compute radiative effects over slopes:
&NAM_SURF_ATM
LVERTSHIFT = .FALSE.,
LNOSOF = .TRUE.,
LSLOPE = .TRUE.
/

To use HWSD clay and sand database :
&NAM_ISBA
YCLAY = 'CLAY_HWSD_MOY' ,
YCLAYFILETYPE = 'DIRECT' ,
YSAND = 'SAND_HWSD_MOY' ,
YSANDFILETYPE = 'DIRECT' ,

To use ECOCLIMAP land cover database :

&NAM_FRAC
LECOCLIMAP = .TRUE.,
/
&NAM_PGD_ARRANGE_COVER
LWATER_TO_NATURE = .TRUE.,
LTOWN_TO_ROCK = .TRUE.
/
&NAM_COVER
YCOVER = 'ECOCLIMAP_II_EUROP',
YCOVERFILETYPE = 'DIRECT' ,
XRM_COVER = 0.01
/
&NAM_ECOCLIMAP2
LCLIM_LAI= .TRUE.
/
&NAM_PREP_ISBA_SNOW
LSNOW_PREP_PERM = .FALSE.
(in addition to other keys of this namelist)

NB: For very high resolutions and use of ECOCLIMAP database (1 km resolution), NHALO in NAM_IO_OFFLINE must be increased (NHALO=10 for 50 m resolution)

If you activate the use of HSWD and/or ECOCLIMAP databases, you will need the files of the database.
At CEN, the files are automatically taken from the /rd/cenfic3/manto/lafaysse/FILES_PGD directory.
In other environments, you need to:
(1) download the files from http://www.umr-cnrm.fr/surfex//spip.php?article135 and http://www.umr-cnrm.fr/surfex//spip.php?article136
(2) set the DIRDATAPGD environment variable to the directory where you download the files

To restrict simulations to soil-vegetation tile:
/
&NAM_PGD_SCHEMES
CNATURE = 'ISBA ' ,
CSEA = 'NONE' ,
CTOWN = 'NONE ' ,
CWATER = 'NONE'

For simulation with snow transport :
(SNOWPAPPUS model doc https://zenodo.org/records/7681340)
/
&NAM_ISBA_SNOWn
CSNOWDRIFT='NONE'
LSNOWDRIFT_SUBLIM= .FALSE.
LSNOW_ABS_ZENITH= .FALSE.
CSNOWMETAMO='B21'
CSNOWRAD='B92'
LSNOWPAPPUS=.TRUE.
CSNOWPAPPUSERODEPO='DIV'
CSNOWMOB='GM98'
CPAPPUSSUBLI='SBSM'
OPAPPULIMTFLUX=.TRUE.
OPAPPUDEBUG=.FALSE.
/