Class Lehning_snowpack

Defined in File snowpack.hpp

Nested Relationships

Nested Types

Struct Lehning_snowpack::data

Inheritance Relationships

Base Type

public module_base (Class module_base)

Class Documentation

class Lehning_snowpack : public module_base 

SNOWPACK (Bartelt and Lehning, 2002) is a multilayer finite-element energy balance snow model originally developed for avalanche hazard forecasting. It has the greatest computational burden of all snowpack models in CHM. This version of SNOWPACK has been modified to allow unlimited removal of snow layers by the blowing snow and avalanche routines.

Depends:

Incoming shortwave radiation, all beams “iswr” [ \( W \cdot m^{-2} \) ]
Incomging longwave radiation “ilwr” [ \( W \cdot m^{-2} \) ]
Relative humidity “rh” [%]
Air temperature “t” [ \( {}^\circ C \)]
Windspeed at 2m “U_2m_above_srf” [ \( m \cdot s^{-1} \)]
Precipitation “p” [ \( mm \cdot dt^{-1} \)]
Precipitation rain fraction “frac_precip_rain” [-]
Snow albedo “snow_albedo” [-]

Optional:

Optionally, depend on the _subcanopy variants of the above
Blowing snow erosion/deposition mass “drift_mass” [mm]
Ground temperature “T_g” [ \( {}^\circ C \)]

Provides:

Change in internal energy “dQ” [ \( W \cdot m^{-2} \) ]
Snow water equivalent “swe” [mm]
Bulk snow temperature “T_s” [ \( {}^\circ C \)]
Surface exchange layer temperature “T_s_0”
Number of discretization nodes “n_nodes”
Number of discretization layers “n_elem”
Snowdepth “snowdepthavg” [m]
Sensible heat flux “H” [ \( W \cdot m^{-2} \) ]
Latent heat flux “E” [ \( W \cdot m^{-2} \) ]
Ground heat flux “G” [ \( W \cdot m^{-2} \) ]
Outgoing longwave radiation “ilwr_out” [ \( W \cdot m^{-2} \) ]
Reflected shortwave radiation “iswr_out” [ \( W \cdot m^{-2} \) ]
Net allwave radiation “R_n” [ \( W \cdot m^{-2} \) ]
Snowpack runoff “runoff” [mm]
Snow mass removed “mass_snowpack_removed” [mm]
Total snowpack runoff “sum_runoff”
Total surface sublimation loss “sum_subl”
Sublimation loss “sublimation”
Evaporation loss “evap”
”MS_SWE”
”MS_WATER”
”MS_TOTALMASS”
”MS_SOIL_RUNOFF”

Configuration:

{
   "sno":
   {
      "SoilAlbedo": 0.09,
      "BareSoil_z0": 0.2,
      "WindScalingFactor": 1,
      "TimeCountDeltaHS": 0.0 *
   }

Note

Currently SNOWPACK is setup to be run an external albedo model and should be changed to default back to the SNOWPACK one.

Public Functions

Lehning_snowpack(config_file cfg)

~Lehning_snowpack()

virtual void run(mesh_elem &face)

Needs to be implemented by each data parallel module. This will be called and executed for each timestep

Parameters:

face – The terrain element (triangle) to be worked upon for an element parallel domain
global_param – A pointer to the shared global paramter space with domain-wide paramters

virtual void init(mesh &domain)

Public Members

double sn_dt

double const_T_g

struct data : public face_info

Public Members

boost::shared_ptr<Snowpack> sp

boost::shared_ptr<SnowStation> Xdata

boost::shared_ptr<SnowpackConfig> Spackconfig

boost::shared_ptr<Meteo> meteo

boost::shared_ptr<Stability> stability

mio::Config config

double cum_precip

double sum_subl