Data Structures

All data structures are identified in the header file vic2l_def.h. The following tables detail the structures, and the variables they contain:

infiles_struct
outfiles_struct
filenames_struct
global_param_struct
soil_con_struct
veg_con_struct
atmos_data_struct
dmy_struct
soil_var_struct
veg_var_struct
out_data_struct

struct infiles_struct:

Variable Type Variable Name Description

FILE * soilparam Soil parameters file.

FILE * vegparam Vegitation parameters file.

FILE * snowout Snow model output file.

FILE * snowin Snow model input file.

FILE * globalparam Global parameters file.

struct outfiles_struct:

Variable Type Variable Name Description

FILE * moist1 Moisture content for first layer

FILE * moist2 Moisture content for second layer

FILE * evap Evaporation output file.

FILE * runoff Runoff output file.

FILE * baseflow Baseflow output file.

struct filenames_struct:

Variable Type Variable Name Description

char * snowout Filename for snow model output file.

char * snowin Filename for snow model input file.

char * global Filename for global parameter input file.

char * soil Filename for soil input file.

char * veg Filename for vegetation input file

char * result_dir Pathname for result files.

char * moist1 Filename for first layer output file

char * moist2 Filename for second layer output file.

char * evap Filename for evaporation output file.

char * runoff Filename for runoff output file.

char * baseflow Filename for baseflow output file.

struct global_param_struct:

Variable Type Variable Name Description

int model_type Unused at this time

float resolution Grid cell resolution in degrees.

int startyear Year of start of simulation

int startmonth Month of start of simulation.

int startday Day of start of simulation

int nrecs Number of records (or time steps) in simulation.

double wind_h Height at which wind was measured

double measure_h Height of surface measurements

struct soil_con_struct:

Variable Type Variable Name Description

int gridcel Grid cell number

float lat Latitude of current grid cell.

float lng Longitude of current grid cell.

double b_infilt Infiltration parameter

double max_moist_tot Maximum total moisture content.

double Ds Subsurface flow rate

double Dsmax Maximum subsurface flow rate

double Ws Soil moisture content

double c

double maxsoilmoist2factor Maximum soil moisture content of layer 2

double expt Exponent

double Ksat Saturated hydraulic conductivity

double init_top_moist Initial moisture content of top layer

double init_bottom_moist Initial moisture content of bottom layer

double evapfactor Evaporation factor

float elevation Elevation of grid cell

double max_moist1 Maximum moisture content of layer 1

double max_moist2 Maximum moisture content of layer 2

double max_infil Maximum infiltration rate

double Wcr1 Critical moisture content of first layer

double Wcr2 Critical moisture content of second layer

double Wpwp1

double Wpwp2

double rough Roughness

struct veg_con_struct:

Variable Type Variable Name Description

int vegetat_type_num Number of vegetation types in grid cell

int veg_class Vegitation class number

double Cv Specific heat of plant

double Cv_sum

double rarc Architectual roughness

double rs Stomatal roughness

double root1 Percentage of roots in first layer

double root2 Percentage of roots in second layer

double LAI[12] Monthly leaf area index for vegetation type

double rough Roughness

double displacement

double Wdmax[12]

struct atmos_data_struct:

Variable Type Variable Name Description

double melt Amount of snow melt in grid cell

double prec Amount of precipitation in grid cell

double air_temp Current air temperature in grid cell

double pan_evap Pan evaporation rate in grid cell

double rain_plus_snow

double rainonly

double wind Current wind

double sun_hr Solar hour, for use in computing incoming solar radiation

double rad Current radiation

double vpd Vapor pressure deficit

double pressure Atmospheric pressure at surface

double rel_humid Relative humidity

double tmin Minimum daily temperature

double tmax Maximum daily temperature

double priest Evaporation calculated by preistly method

double trans Atmospheric transmissivity

double shortwave Incoming shortwave radiation calculated using aurad subroutine (Used for calculation of vpd)

double shortwave2 Incoming shortwave radiation used for energy balance (more believable than shortwave)

double longwave Net longwave radiation

double net_short Net shortwave radiation

double albedo Surface albedo

struct dmy_struct:

Variable Type Variable Name Description

int day Day of current time step

int month Month of current time step

int year Year of current time step

int day_in_month Yearly Julian date (1-365/366)

struct soil_var_struct:

Variable Type Variable Name Description

double moist1[2] Moisture layer 1
([0] = current time step, [1] = next time step)

double moist2[2] Moisture layer 2
([0] = current time step, [1] = next time step)

double baseflow Computed baseflow within grid cell

double Q12 Infiltration from first to second layer

double runoff Calculated runoff from grid cell

double evap1 Calculated evaporation from first layer

double evap2 Calculated evaporation from second layer

struct veg_var_struct:

Variable Type Variable Name Description

double canopyevap Calculated canopy evaporation

double Wdew[2] Calculated amount of dew trapped on plants ([0] = current time step, [1] = next time step)

double throughfall Calculated amount of water that falls through vegetation

struct out_data_struct:

Variable Type Variable Name Description

double evap Final calculated evaporation

double runoff Final calculated runoff

double baseflow Final calculated baseflow

double moist1 Final calculated moisture content of first layer

double moist2 Final calculated moisture content of second layer

Return to VIC Water Balance Model Contents

Hydrology Homepage / University of Washington / VIC Administrator

Variable Type	Variable Name	Description
FILE *	soilparam	Soil parameters file.
FILE *	vegparam	Vegitation parameters file.
FILE *	snowout	Snow model output file.
FILE *	snowin	Snow model input file.
FILE *	globalparam	Global parameters file.