Description Usage Format Source Examples
Basic hydrologic properties for twelve soil texture classes.
1 | data("soildat")
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A data frame with 12 observations on the following 9 variables.
Soil
Texture class abbreviation.
SoilName
Texture class name.
Ksat
Saturated hydraulic conductivity (mm d^(-1)).
ThetaSAT
Water potential at saturation.
ThetaFC
Water potential at field capacity.
ThetaWP
Water potential at wilt point.
ff
Fraction of fine (clay) particles.
fm
Fraction of medium (silt) particles.
fc
Fraction of coarse (sand) particles.
Clapp, RB, Hornberger, GM. 1978. Empirical equations for some soil hydraulic properties. Water Resour Res 14:601-604. DOI: 10.1029/WR014i004p00601.
Karkanis, PG. 1983. Determining field capacity and wilting point using soil saturation by capillary rise. Can Agr Eng 25:19-21.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | # state college GHCN data
#
# weather <- read.dly(system.file("extdata", "USC00368449.dly", package = "VFS"))
data("weather") # same object
weather.param <- wth.param(weather, method="markov")
rain.compare <- rainfall(365*2, weather.param)
temp.compare <- temperature(365*2, weather.param)
data(soildat)
data(bufferdat)
# bluegrass buffer, clay loam soil
# short simulation to cut down on time required
vfs.CL <- VFS(nyears = 2, thissoil = subset(soildat, Soil == "CL"),
rain=rain.compare, temperature=temp.compare,
thisbuffer = subset(bufferdat, Species == "bluegrass"), Duration = 2,
FieldArea = 4000, VFSwidth = 10.7, VFSslope = 0.02,
z = 1000, b = 1.5)
print(vfs.CL)
summary(vfs.CL)
aple.CL <- VFSAPLE(vfs.CL, soilP = 120, OM = 2)
print(aple.CL)
summary(aple.CL)
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