n_wong2006 {HYDROCAL}

Compute grain roughness following Wong and Parker (2006)

Description

n_wong2006 calculate Manning's n using the Wong and Parker (2006) method for estimating grain roughness

Usage

n_wong2006(grain, restrict = TRUE)

Arguments

grain

grain size (d90) in millimeters. The original model was calibrated for 0.38 mm < d90 < 28.65 mm

restrict

allows for function parameters to restrict certain values. Type bool. Default TRUE.

Value

Manning's n

References

Wong, M., and G. Parker. 2006. Reanalysis and Correction of Bed-load Relation of Meyer-Peter and Muller Using Their Own Database. Journal of Hydraulic Engineering. American Society of Civil Engineers, Vol. 132 (11), pp. 1159-1168.

Examples

# Result: Manning's n of 0.022
n_wong2006(20)

# Result: Manning's n of 0.013
n_wong2006(0.82)

# Result: Manning's n of 0.021
n_wong2006(12)

# Result: Grain must be within 0.38 and 28.65 mm.
n_wong2006(30)