advectionFuniform function

Uniform advection field

Provides an advection field with constant orthogonal (u and v) components at each grid point. This mimics rigid translation in a given direction according to the components u and v of the velocity vector.

advectionFuniform(spacepoints, u, v)

Arguments

• spacepoints: vector of coordinates (2 x d), where d is the number of locations/grid points
• u: velocity component along the x axis
• v: velocity component along the y axis

Examples

library(ggquiver)
library(ggplot2)
## specify coordinates
m = 25
aux <- seq(0, m - 1, length = m)
coord <- expand.grid(aux, aux)

af <- advectionFuniform(spacepoints = coord,
                       u = 2,
                       v = 6)

## visualize advection field
dta <- data.frame(lon = coord[ ,1], lat = coord[ ,2], u = af[ ,1], v = af[ ,2])
ggplot(dta, aes(x = lon, y = lat, u = u, v = v)) +
geom_quiver() +
theme_light()

References

Papalexiou, S.M., Serinaldi, F., Porcu, E. (2021). Advancing Space-Time Simulation of Random Fields: From Storms to Cyclones and Beyond. Water Resources Research, 57, e2020WR029466, tools:::Rd_expr_doi("10.1029/2020WR029466")