hydReng (version 1.0.0)

scour_horz: Scour depth and length (horizontal jet)

Description

Calculate scour depth and position (length) formed by horizontal jet

Usage

scour_horz(Q,B,h,h_u,d90,W=NULL,a=NULL,mu=NULL,l0=NULL,
method="Eggenberger")

Value

T0

water table at maximal scour depth [m]

S

maximal scour depth [m]

l1

horizontal distance of maximal scour depth to overfall crest [m]

l2

total horizontal distance of scour depth from overfall crest [m]

Arguments

Q

flow [m3/s]

B

channel width [m]

h

difference between upstream and downstream water table [m]

h_u

downstream water table [m]

d90

d90 of grain size distribution [mm]

W

shape value. For free waved jet w = 15.4 and for covered waved jet w = 10.35. If the parameters a and mu are known, W is calculated in the function and must not be specified

a

gate opeing height [m]

mu

contraction value. Values between 0.6 (orthogonal gates) and 0.8 (inclined gates) are recommended [-]

l0

length of fix sole protection downstream the gate [m] (for method Shalash)

method

method to calculate scour depth. valid values are "Eggenberger" or "Shalash". Independet of the chosen method, the position of the scour is calculated according to "Eggenberger".

References

Bezzola (2012). Vorlesungsmanuskript Flussbau. ETH Zürich.

Examples

## calculate scour depth accordint to Eggenberger returing all results
scour_horz(Q = 4, B = 1, h = 5, h_u = 1.76, d90 = 150, a = 1, mu = 0.6)

## calculate scour depth accordint to Eggenberger with given W value
scour_horz(Q = 4, B = 1, h = 5, h_u = 1.76, d90 = 150, W = 15.4)

## calculate scour depth accordint to Shalash with l0=5
scour_horz(
  Q = 4, B = 1, h = 5, h_u = 1.76, d90 = 150,
  method = "Shalash", l0 = 5, a = 1
)