9455

• UCREFRP Catalog Number: 9455
• Author: Lyons, J. K., M. J. Pucherelli and R. C. Clark.
• Title: Sediment Transport and Channel Characteristics of a Sand-Bed portion of the Green River Below Flaming Gorge Dam, Utah, U.S.A.
• USFW Year: 1992.
• USFW - Doc Type: R-92-08,
• Copyright Material: NO

Table 1. - Sediment rating curves, U.S. Geological Survey gauges
on the Green River and tributaries.
Gauge Type Equation 1,2 RF
09261000 Sand load Qs = 0.102 (Q-18.4)2' 0.8643
09307000 Sand load Qs = 0.627 (Q-15.6)1'742 0.7354
09315000 Sand load Qs = 0.00864 (Q-212?'468 0.8090
Duchesne R.
09302000 Suspended Qs = 6.69 Q"M 0.7204
White R.
09306900 Sand load Qs = 2.54 (Q-3.5)2'001 0.9397
1Q9 = Sedi ment discharge, tonnes/day.
2Q = Discharge, m3/s.
Figure 3 contains the computed bed-material loads for the data collected at site C and the
suspended sand loads measured at gauge 09307000 from 1951 to 1966. The data collected in
1986-88 fall within the scatter of the gauge data The suspended sand load rating curve
developed for this gauge was used to describe the bed-material load transport at site C (table 1).
Suspended sand load rating curves were also developed for gauge 09315000 (1951-1982) in
study reach 2, and gauge 09306900 on the White River near the confluence with the Green
(1974-86). A suspended sediment rating curve was developed for the Duchesne River from the
data for gauge 09302000 near the confluence with the Green River (table 1).
Computing Effective Discharge
Effective discharge is defined as the modal value of the sediment load duration function
developed for a given location. Using mean daily flow data from gauges 09261000 and 09315000
and the sediment load rating curves described above, the effective discharges at the sample
points A, B, and C were computed. These data were categorized into 35 flow ranges of equal
size. The effective discharge was defined as the midpoint of the flow range in which total sand
load for the time period studied was maadmized. Total sand load is the sum of the computed
sand loads (from the suspended sand rating curves developed from the gauge data) for all the
discharges in a given flow range.
The time period used in this analysis was 1965-1987. For site C, 2751dlometers below the dam,
mean daily flow values were obtained by adjusting mean daily flow records for gauge 09315000.
A linear correlation between mean daily flow data for gauge 09315000 and for gauge 09307000
for 1963-66 yielded an e value of 0.97 when a 2-day lag period was used. This correlation was
used to adjust the 1965-1987 flow record for gauge 09315000 for use in computing the effective
discharge at site C.
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