| Type: | Package |
| Title: | Ecohydrological Modelling |
| Version: | 1.0.0 |
| Date: | 2017-08-20 |
| Author: | Rodolfo Souza |
| Maintainer: | Rodolfo Souza <rodolfomssouza@gmail.com> |
| Description: | Simulates the soil water balance (soil moisture, evapotranspiration, leakage and runoff), rainfall series by using the marked Poisson process and the vegetation growth through the normalized difference vegetation index (NDVI). Please see Souza et al. (2016) <doi:10.1002/hyp.10953>. |
| License: | GPL-2 |
| Encoding: | UTF-8 |
| LazyData: | FALSE |
| RoxygenNote: | 6.0.1 |
| Imports: | graphics, stats |
| NeedsCompilation: | no |
| Packaged: | 2017-08-24 12:06:59 UTC; rodolfo |
| Repository: | CRAN |
| Date/Publication: | 2017-08-24 12:22:51 UTC |
Canopy interceptation
Description
This function calculates the amount of rain intercepted in the canopy.
Usage
CInt_f(R, Rstar)
Arguments
R |
Rainfall |
Rstar |
The maximum amount which the canopy intercepts |
Details
Interceptation
Value
canopy interceptation
Examples
CInt_f(R = 10, Rstar = 3)
Evapotranspiration
Description
This function calculates the evapotranspiration based on the soil moisture, soil water retantion curve and vegetation properties.
Usage
Et_f(s, Emax, Ew, sh, sw, sstar)
Arguments
s |
Soil moisture |
Emax |
Maximum evapotranspiration rate |
Ew |
Minimum evapotranspiration rate |
sh |
Soil moisture at hidroscopic point |
sw |
Soil moisture at wilting point |
sstar |
Soil moisture below field capacity point |
Details
Evapotranspiration function based on the soil moisture
Value
evapotranspiration
Examples
Et_f(s = 0.25, Emax = 5, Ew = 0.5, sh = 0.01, sw = 0.15, sstar = 0.40)
Leakage
Description
This function calculates the leakage based on the soil moisture, soil water retantion curve and the soil hydraulic conductivity.
Usage
Lk_f(s, Ks, b)
Arguments
s |
Soil moisture |
Ks |
Soil saturated hydraulic conductivity |
b |
The exponent of the water retention curve |
Details
Leakage function based on the soil moisture
Value
leakage
Examples
Lk_f(s = 0.25, Ks = 2000, b = 4.38)
Rainfall series
Description
This function simulates rainfall series as a stochastic variable, by using marked Poisson process.
Usage
RainPoisson(ndays, lambda, alpha)
Arguments
ndays |
Number of days |
lambda |
The frequency of rainfall events (day^-1) |
alpha |
The mean of rainfall event (cm day^-1) |
Details
Rainfall series
Value
rainfall series
Examples
RainPoisson(ndays = 60, lambda = 0.1, alpha = 0.95)
NDVI simulation
Description
This function simulates the NDVI based on soil moisture and vegetation parameters. Numerical solution.
Usage
SimNDVI(s, sw, sstar, kA, kR, Nmax, Nmin, N0)
Arguments
s |
A vector with soil moisture |
sw |
Soil moisture at wilting point |
sstar |
Soil moisture below field capacity point |
kA |
Constant of assimilation |
kR |
Constant of respiration |
Nmax |
Maximum NDVI of the vegetation |
Nmin |
Minimum NDVI of the vegetation |
N0 |
Initial condiction of NDVI. If it is missing, the average of Nmax and Nmin will be used |
Details
NDVI simulation
Value
NDVI series
Examples
rain = 10 * RainPoisson(ndays = 365, lambda = 0.05, alpha = 0.60)
s = swb_f(R = rain, Rstar = 3, Emax = 5, Ew = 0.5, Ks = 2000, b = 4.38, Zr = 400,
n = 0.5, sh = 0.01, sw = 0.10, sstar = 0.25, s0 = 0.10, nsteps = 48, gr = T)[,3]
NDVI = SimNDVI(s, sw = 0.10, sstar = 0.35, kA = 0.064, kR = 0.011,
Nmax = 0.93, Nmin = 0.26, N0 = 0.5)
Soil water balance
Description
This function calculates the daily soil water balance and its components based on the rainfall, soil properties and vegetation properties.
Usage
swb_f(R, Rstar, Emax, Ew, Ks, b, Zr, n, sh, sw, sstar, nsteps, s0, gr)
Arguments
R |
Daily rainfall, which should be a vector. |
Rstar |
The maximum amount which the canopy intercepts |
Emax |
Maximum evapotranspiration rate |
Ew |
Minimum evapotranspiration rate |
Ks |
Soil saturated hydraulic conductivity |
b |
The exponent of the water retention curve |
Zr |
Root depth |
n |
The soil porosity |
sh |
Soil moisture at hidroscopic point |
sw |
Soil moisture at wilting point |
sstar |
Soil moisture below field capacity point |
nsteps |
Number of steps/division for the numerical solution |
s0 |
Initial soil moisture to start the simulation. If it is missing, s0 is signed equal to sh. |
gr |
Logical argument to show graphics of results. Default is FALSE |
Details
Soil water balance
Value
soil water balance components
Examples
rain = 10 * RainPoisson(ndays = 365, lambda = 0.05, alpha = 0.60)
swb_f(R = rain, Rstar = 3, Emax = 5, Ew = 0.5, Ks = 2000, b = 4.38, Zr = 400,
n = 0.5, sh = 0.01, sw = 0.10, sstar = 0.25, s0 = 0.10, nsteps = 48)