advectionF function

Advection fields

Provides parametric functions that describe different types of advection fields.

advectionF(id, ...)

Arguments

• id: advection type id (uniform, rotation, spiral, spiralCE, radial, and hyperbolic)
• ...: other arguments (vector of coordinates and parameters of advection field functions)

Examples

library(ggquiver)
library(ggplot2)

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

## get the advection field
af <- advectionF('spiral',
                 spacepoints = coord,
                 x0 = floor(m / 2),
                 y0 = floor(m / 2),
                 a = 3,
                 b = 2,
                 rotation = 1)

## 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")