WSP05604

• File Number: 8220.101.10.D
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 1/1/1999
• Author: Topping et al.
• Title: Linkage Between Grain-Size Evolution and Sediment Depletion During Colorado River Floods
• Water Supply Pro - Doc Type: Report/Study

74 GRAIN-SIZE EVOLUTION DURING FLOODS

. Upper gage
e) Lower gage
. X-section 0 & measurement
cableway
__ - X-section 1
__- - )(-seclion 2

3150

.

-.~ . - X.section 3
----.--- X-section 4
o Bed-material sampling slalion
B3 Bed-material and P-61 depth-in!. & point
suspended-sediment sampling station
Edge 01 water during flood
I

3100 .
.
. .
. .
.
. .
.
. .
. /
. .
. .
3050 .
/ /
E
/
,., /
/ /
/ /
3000 /
t / Sta, 290
/ Sta, 240
/ Sta.190
2950 ta.140
flow
N direction
2900
3050 3100 3150 3200 3250
x(m)

Figure 1. Map of the study area at the Grand Canyon gage showing the locations of the upper and lower gages. the
measuremenl cableway, the locations of the bed-material and P.61 depth-integrated and point suspended-sediment
measurement stations on the cableway. and (he cross-sections sur...eyed during the 1996 comrolled flood.

Glyssoll 11988J provide a detailed descriplion of Ihese
samplers), The P-61 sampler was deployed altwo verticals
localed 1/3 (SIal ion 290: sampling stalions are measured in
feel from Ihe right-bank endpoint of Ihe cable) and 2/3
(Slation 190) of the distance across Ihe channel in bOlh a
depth-integrating and a poim-integraling mode. In the

depth-inlegraling mode. 2 to 4 samples were collected at
each vertical on days 1-7 and + 1 hy opening Ihe P-61
sampler al the bottom and raising it to the surface al a
uniform rale. In Ihe poinl-integrating mode, J samples were
collected wilh the P-61 sampler al 6 points in each verlical
on days 2, 4, and 7, On days -1,2,4,6 and 7, the D-77 bag