FVCOM手册缺少有关地下水输入配置的详细信息。因此，通过阅读可以收集以下文档mod_force.F。

只有constant，periodic并且variable已经在FVCOM实现（没有static或time dependent尚未（二○一五年十一月一十八日））。

在中MPDATA启用时，地下水输入无效make.inc。

要在整个域中输入地下水，可以将名称列表编辑为使用constant GROUNDWATER_KIND以下格式：

&NML_GROUNDWATERGROUNDWATER_ON      = T,GROUNDWATER_TEMP_ON = T,GROUNDWATER_SALT_ON = T,GROUNDWATER_KIND    = 'constant',GROUNDWATER_FILE    = 'none',GROUNDWATER_FLOW    = 0.1,GROUNDWATER_TEMP    = 7.0,GROUNDWATER_SALT    = 50
/

的单位为GROUNDWATER_FLOWm / s。

MATLAB fvcom-toolbox包含一个脚本（write_FVCOM_groundwater），在给定一组值的情况下，该脚本将生成随时间变化（并可能随时间变化）的地下水输入netCDF文件。给定一组坐标和值（通量，温度和盐度），脚本将在所有位置（指定为地下水源的位置除外）输出零通量的netCDF。

创建netCDF文件后，应相应地编辑FVCOM名称列表：

&NML_GROUNDWATERGROUNDWATER_ON      = T,GROUNDWATER_TEMP_ON = T,GROUNDWATER_SALT_ON = T,GROUNDWATER_KIND    = 'variable',GROUNDWATER_FILE    = 'casename_grndwtr.nc'
/

write_FVCOM_groundwater下面是 netCDF格式输出的示例：

netcdf casename_grndwtr {
dimensions:node = 81076 ;nele = 155997 ;time = UNLIMITED ; // (1096 currently)DateStrLen = 26 ;
variables:float groundwater_flux(time, node) ;groundwater_flux:long_name = "groundwater volume flux" ;groundwater_flux:units = "m3 s-1" ;groundwater_flux:grid = "fvcom_grid" ;groundwater_flux:type = "data" ;float groundwater_temp(time, node) ;groundwater_temp:long_name = "groundwater inflow temperature" ;groundwater_temp:units = "degrees_C" ;groundwater_temp:grid = "fvcom_grid" ;groundwater_temp:type = "data" ;float groundwater_salt(time, node) ;groundwater_salt:long_name = "groundwater inflow salinity" ;groundwater_salt:units = "1e-3" ;groundwater_salt:grid = "fvcom_grid" ;groundwater_salt:type = "data" ;int iint(time) ;iint:long_name = "internal mode iteration number" ;char Times(time, DateStrLen) ;Times:time_zone = "UTC" ;// global attributes::type = "FVCOM GROUNDWATER FORCING FILE" ;:source = "FVCOM grid (unstructured) surface forcing" ;:history = "File created with write_FVCOM_groundwater from the MATLAB fvcom-toolbox" ;