Albuquerque, NM Honolulu, HI Grand Canyon, AZ Los Angeles, CA Colorado River.
Colorado River in Grand Canyon
description
Transcript of Colorado River in Grand Canyon
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Colorado River in Grand Canyon
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Colorado River in Grand Canyon
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slant range, R (m)
FCB
(dB)
Sand concentrations all < 10 mg/L
silt/clay ~ 5,000 mg/L
silt/clay ~ 2,000 mg/L
silt/clay ~ 600 mg/L
silt/clay ~ 100 mg/L
Back
scat
ter (
dB)
Fine sediment leads to substantial attenuation along the beam path
Fines are mostly clay in the this river
Distance along beam (m)
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Colorado River in Grand Canyon
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0 5 10 15 20 25
slant range, R (m)
FCB
(dB)
Silt/clay concentrations all < 100 mg/L
sand ~ 10 mg/L
sand ~ 50 mg/L
sand ~ 600 mg/Lsand ~ 200 mg/L
Back
scat
ter (
dB)
Sand sizes influence the backscatter level
Suspended sand is typically ~100 µm
Distance along beam (m)
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y = 0.076x - 4.197R2 = 0.932
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1.0
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4.0
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SCB (dB)
log
10[S
SC
, san
d]
Field calibrations
y = 1345.728xR2 = 0.996
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Sediment attenuation (dB/m)
SS
C, s
ilt-a
nd-c
lay
(mg/
L)
Fines SSC correlates with attenuation
Sand SSC correlates with backscatter
Backscatter (dB)
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Scattering theory
1E-05
1E-04
1E-03
1E-02
1E-01
1E+00
1E+01
1E+02
1E+03
1E+04
1 10 100 1000
Particle diameter (um)
Bac
ksca
tter
1.E-05
1.E-04
1.E-03
1.E-02
Atte
nuat
ion
Backscatter
Attenuation
sandsilt-and-clay
1000 kHz frequencyNo
t typ
ically
in
susp
ensio
n in
rive
rs
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Sacramento River and SF Bay
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Calibrate ADV backscatter to LISST concentration
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Ero
sion
/dep
ositi
on ra
te
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8
Wat
er le
vel (
m)
Water levelErosionDeposition
Compute turbulent sediment fluxes from ADV velocity and calibrated backscatter