EcoHydRology (version 0.4.12.1)

SnowMelt: Snow Melt Calculator

Description

Calculates snow pack accumulation and melt

Usage

SnowMelt(Date, precip_mm, Tmax_C, Tmin_C, lat_deg, slope = 0,
 aspect = 0, tempHt = 1, windHt = 2, groundAlbedo = 0.25,
 SurfEmissiv = 0.95, windSp = 2, forest = 0, startingSnowDepth_m = 0,
 startingSnowDensity_kg_m3=450)

Arguments

Date

Vector of dates (class Date or character) in this format: Y-m-d

precip_mm

Precipitation in mm

Tmax_C

Daily maximum temperature (degrees C)

Tmin_C

Daily minimum temperature (degrees C)

lat_deg

Degrees latitude

slope

Overall slope of area of interest

aspect

Aspect of the area of interest

tempHt

height of temperature measurements (m)

windHt

height of wind measurements (m)

groundAlbedo

Ground Albedo, 0-1 (-)

SurfEmissiv

Surface Emissivity, 0-1 (-)

windSp

Wind speed - either a vector of measured values or a single value of average wind speed for the site (m/s)

forest

Forest cover (shade) - use this only when determining snowmelt under a canopy, 0-1 (-)

startingSnowDepth_m

The depth of the snow pack initially (m)

startingSnowDensity_kg_m3

The density of snow on the ground on the first day (kg/m3)

Value

This will return a 10 column data frame with nrow = length of input weather data. Column names are : Date, MaxT_C, MinT_C, Precip_mm, Rain_mm, SnowfallWatEq_mm, SnowMelt_mm, NewSnow_m, SnowDepth_m, SnowWaterEq_mm

Warning

This function cannot handle NA values in input, and can only be run for continuous daily data. For data-sets missing values, run discontinuous segments separately.

References

Walter, M.T. , E.S. Brooks, D.K. McCool, L.G. King, M. Molnau, J. Boll. 2005. Process-based snowmelt modeling: Does it require more input data than temperature-index modeling? Journal of Hydrology 300(1-4): 65-75

Examples

# NOT RUN {
##  
data(OwascoInlet)
sm <- SnowMelt(Date=OwascoInlet$date, precip_mm=OwascoInlet$P_mm,
 Tmax_C=OwascoInlet$Tmax_C, Tmin_C=OwascoInlet$Tmin_C, lat_deg=42)
summary(sm)
# }