WSP09464

• File Number: 8220.101.10.D
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 5/24/2000
• Author: Hazel et al.
• Title: Sand Deposition in the Colorado River Ecosystem from Flooding of the Paria River and the Effects of the Nov 1997 Glen Canyon Dam Test Flow
• Water Supply Pro - Doc Type: Report/Study

NAU Sand Bar Studies
1100 0.12
A water discharge
1000 . suspended-sill and clay
... suspended-sand (')
900 0
'" 0,08 "
;;0- n
<D
~ ... "
800 -
.. ;;;
~ .. 5'
<D 700 "
.s:::
" . 0,04 <-
,!!l .. 0
C 600 .
.. <f'.
500 ..
..
. 0,00
400
0.11 0,31
E
E B '"
<D
,!;; . . 0,30 c.
'" .... '"
<D
,!::! c.
'" 0,10 0,29 3'
,!;; <D
e "
0> ..
0,28 ""
'C ;;;
"
ClI 5'
'" '"
'C 0,09 ... 0.27 N'
'" <D
'C
" . Channel Bad Sand 5'
'"
c. .. Suspendad.Sand 0,26 3
'" 3
"
en
0,08 0,25
11.2.97 11-3-97 11-4.97 11.5.97 11-6.97 11.7-97

Final Report

~ .
"

~
~

,

','

"

.'~
"
.~
;~
r~
",
~,

~I
.,.
,

;...'

'<

To"
:::~

Figure 6, Suspended sediment concentrations and instantaneous discharge at the lower Marble
Canyon gage during the 1997 test flow in A. Suspended sediment grain size and bed sediment grain
size in B.

r::
;,"
~r
~~~
~

"
':~.
~~

the 1997 Test Flow the median grain size of suspended sediment was still finer than that observed at
the start of the 1996 Controlled Flood but the bed material grain size had nearly equaled the size
measured towards the end of the 1996 Controlled Flood (Topping et ai" 2000b),
There was one important difference that existed in sand transport characteristics at the Lower
Marble Canyon gage between the controlled high releases in 1996 and 1997, During the 1996
Controlled Flood, the suspended-sand concentrations at the Lower Marble Canyon gage were
approximately half those measured at the Grand Canyon gage, located 42 kIn further downstream
(Topping et ai" 2000b), However, during the 2 days of the lesser magnitude 1997 Test Flow, the sand
concentrations measured at the Lower Marble Canyon gage equaled those measured at the Grand

~
~~ I
':'!
;1;
~~~
?;
,,'

.~ .~

22