hydReng (version 1.0.0)

shear_str: Shear stress, shear velocity, and dimensionless shear stress

Description

Calculates shear stress, shear velocity, and dimensionless shear stress based on water depth, slope, and grain size.

Usage

shear_str(h0, J, dm = NULL, h = NULL, rho = 1000)

Value

A named list with components:

tau

Shear stress [N/m2].

U

Shear velocity [m/s].

tau_st

Dimensionless shear stress [-], if dm is provided, otherwise NA.

Arguments

h0

Numeric. Total water depth [m].

J

Numeric. Bottom slope [-].

dm

Numeric or NULL. Median grain size (d50) of sediment [mm].

h

Numeric or NULL. Local water depth at the point of interest [m]. If NULL, considered equal to h0.

rho

Numeric. Density of water [kg/m3], default is 1000.

References

Bezzola (2012). Flussbau, Vorlesungsmanuskript, ETH Zuerich

Examples

# Calculate shear stress at bank bottom
shear_str(h0 = 3.31, J = 0.0022)$tau

# Calculate shear stress at bank middle
shear_str(h0 = 3.31, J = 0.0022, h = 1.6)$tau

# Calculate dimensionless shear stress
shear_str(h0 = 3.31, J = 0.0022, dm = 100)$tau_st