flow and sediment transport relations constraining environmental conditions (fluvial fans)
Post on 21-Dec-2015
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Flow and Sediment Transport Relations
Constraining Environmental Constraining Environmental Conditions (Fluvial Fans)Conditions (Fluvial Fans)
Sandy channels Sandy channels
Gravel channels Gravel channels
c
Expanding Flow Expanding Flow
c 3.1
12/3/12
)(]})ˆ11
[({ rDgD
Q
rDgD
rQS w
rcnso
s
RR
w
so
s
r
Q
QS
R32 S
Q
Q
w
so
3
2
Expanding Flow Model (bedload) Parker et al. (1998)
Reduce: n = 3/2 (bedload); Reduce: n = 3/2 (bedload); c
Terrestrial Fans (Stock et al., 2008), Terrestrial Fans (Stock et al., 2008), Experimental Fans Experimental Fans
No Dependence on g, D, or Flow No Dependence on g, D, or Flow Width! Width!
0.00
0.04
0.08
0.12
0.16
0.0 0.5 1.0 1.5
Norm. Distance (r/L)
Norm
. Ele
vation (z/
L)
0.016
0.033
0.063
0.016
0.033
0.063
Qso/Qw
0.00
0.04
0.08
0.0 0.5 1.0 1.5
Norm. Distance (r/L)
Norm
. Ele
vation (z/
L)
0.016
0.033
0.063
0.016
0.033
0.063
Qso/Qw
Suspension-Dominated SandBedload-Dominated Sand
Straight to Concave Profiles Convexo-Concave Profiles
Radial Slope Profiles: 270 mm Sand
0.000
0.050
0.100
0.150
0.200
0 0.5 1 1.5
Norm. Distance (r/L)
Slo
pe0.016
0.033
0.063
0.016
0.033
0.063
Qso/Qw
Bedload-Dominated Sand
Straight to Concave Profiles
Bedload-Dominated Sand Experiments
Vary Qw
Lines are Theoretical Prediction (no tuning of parameters)
0.00
0.04
0.08
0.12
0.16
0.00 0.02 0.04 0.06 0.08 0.10
Qso/Qw
Slo
pe
Qw, 270 um
160 um
270 um
460 um
550 um
Qw, 550 um
Bedload-Dominated Sand Experiments
Vary Qso
Lines are Theoretical Prediction (no tuning of parameters)
0.00
0.04
0.08
0.12
0.16
0.00 0.02 0.04 0.06 0.08 0.10
Qso/Qw
Slo
pe
Qso, 160 um
160 um
Radial Slope Profiles: 120 mm Sand
0.000
0.040
0.080
0.120
0 0.5 1 1.5
Norm. Distance (r/L)
Slo
pe
0.016
0.033
0.063
0.016
0.033
0.063
Qso/Qw
Suspension-Dominated Sand
Convexo-Concave Profiles
Suspension-Dominated Sand Experiments
Vary Qw
Lines are Theoretical Prediction (no tuning of parameters)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.00 0.02 0.04 0.06 0.08 0.10
Qso/Qw
Slo
pe
Qw, 120 um
120 um data
100 um data
Qw, 70 um
70 um data
Qw, 160 um
160 um data
Suspension-Dominated Sand Experiments
Vary Qso
Lines are Theoretical Prediction (no tuning of parameters)
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.00 0.02 0.04 0.06 0.08 0.10
Qso/Qw
Slo
pe
Qso, 120 um
120 um data
Qso, 160 um
160 um data
Suspension-Dominated Coal Experiments
Lines are Theoretical Prediction(sediment transport coefficient tuned to match lowest Qso/Qw point)
0.00
0.01
0.02
0.03
0.04
0.00 0.01 0.02 0.03 0.04 0.05
Qso/Qw
Slo
pe
Qw, 550 um
550 um data
Qw, 130 um
125-130 um data
Qso, 130 um
130 Qso data