convert_units: Convert between phi units and micrometers

In sandbox: Probabilistic Numerical Modelling of Sediment Properties

Convert between phi units and micrometers

Description

The function converts values from the phi-scale (Krumbein 1934, 1938) to the micrometer-scale and vice versa.

Usage

convert_units(phi, mu)

Arguments

phi	numeric vector, grain-size class values in phi to be converted
mu	numeric vector, grain-size class values in micrometres to be converted

Details

φ = -log2(D/D_{0})

with D the diameter in µm and D_{0} the reference diameter. Herer 1000 µm.

Value

numeric vector, converted grain-size class values

Author(s)

Michael Dietze, GFZ Potsdam (Germany)

References

Krumbein, W.C., 1938. Size frequency distributions of sediments and the normal phi curve. Journal of Sedimentary Research 8, 84–90. doi: 10.1306/D4269008-2B26-11D7-8648000102C1865D

Krumbein, W.C., 1934. Size frequency distributions of sediments. Journal of Sedimentary Research 4, 65–77. doi: 10.1306/D4268EB9-2B26-11D7-8648000102C1865D

Examples

## load example data set
## generate phi-values
phi <- -2:5

## convert and show phi to mu
mu  <- convert_units(phi = phi)
mu

## convert and show mu to phi
convert_units(mu = mu)

sandbox documentation built on March 18, 2022, 7:06 p.m.