pdf, 12 MiB - Infoscience - EPFL
pdf, 12 MiB - Infoscience - EPFL
pdf, 12 MiB - Infoscience - EPFL
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Notations<br />
K S [m 1/3 /s] roughness coefficient of STRICKLER<br />
k x [-] coefficient of proportionality<br />
L [N] dynamic lift force<br />
m [-] bank slope<br />
n [s/m 1/3 ] friction coefficient of MANNING 1 ⁄ n = K S<br />
n [-] friction factor used by Zimmermann n = 1.13 ⁄ f<br />
p [-] porosity<br />
P [m] wetted perimeter<br />
p i<br />
[-] part (weight) of the sediment fraction i of a sediment sample<br />
Q [m3/s] discharge<br />
q i<br />
[-] probability that the fraction i of a sediment sample will stay in<br />
place (no movement)<br />
r [m] radius of curvature<br />
R [-] Pearson product moment correlation coefficient<br />
[m]<br />
radius of curvature at the centerline<br />
R c<br />
Re [-] Reynolds number Re = V ⋅4R h ⁄ ν<br />
Re* [-] Grain or shear Reynolds number Re∗<br />
=<br />
V∗ ⋅ d ⁄ ν<br />
[-] Hydraulic radius<br />
R h<br />
s [-] sediment density coefficient s ρ s ρ w<br />
= ⁄ = 2.635<br />
sig [-] sign ±1 depending on the boundary condition; used for the<br />
establishment of a new scour formula<br />
S [-] longitudinal slope<br />
V, v [m/s] average respectively local velocity<br />
Vol [m 3 ] volume<br />
V * [m/s] friction velocity V∗ = τ 0 ⁄ ρ w = g⋅<br />
R h ⋅ S e<br />
X, x [m] carthesian coordinates in stream direction (inlet reach)<br />
Y, y [m] carthesian coordinates in lateral/radial direction<br />
Z, z [m] carthesian coordinates - elevation<br />
α 1 , α 2<br />
[°] location of the first / second scour hole (opening angle<br />
between beginning of the bend and the scour hole)<br />
page 202 / November 9, 2002<br />
Wall roughness effects on flow and scouring
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