n_bathurst1985 {HYDROCAL}

Compute grain roughness via Bathurst (1985)

Description

n_bathurst1985 calculate Manning's n using the Bathurst (1985) method for estimating grain roughness

Usage

n_bathurst1985(depth, grain, restrict = TRUE)

Arguments

depth

flow depth (H) in meters. The original model was calibrated for 0.102 m < H < 1.60 m.

grain

grain size (d84) in millimeters. The original model was calibrated for 113 mm < d84 < 740 mm.

restrict

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

Value

Manning's n

References

Bathurst, J. C. 1985. Flow Resistance Estimation in Mountain Rivers. Journal of Hydraulic Engineering. American Society of Civil Engineers, Vol. 111 (4), pp. 625-643.

Examples

# Result: Manning's n of 0.085
n_bathurst1985(0.15,250)

# Result: Manning's n of 0.036
n_bathurst1985(0.8,120)

# Result: Manning's n of 0.056
n_bathurst1985(1.32,600)

# Result: Grain must be within 113 and 740 mm.
n_bathurst1985(1.32,50)