Bruneau River

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Bruneau River Bruneau River General Information The headwaters of the Bruneau River are in northeast Nevada on the Humbolt National Forest. The river flows northward into Idaho and eventually confluences with the Snake River. The study area includes two river reaches and is associated with U.S. Geological Survey gaging station (13161500), which is located about 0.5 mi. upstream from Rowland, Nevada. The site is at an elevation of about 4,500 ft. The drainage area upstream of the gage is 382 mi2 and the geology of the watershed is mixed with the dominant material being sedimentary and volcanic extrusive. Streamflow records are available from June 1, 1913 to September 30, 1918 and October 1, 1966 to present (Water Year 2012). Sediment transport measurements are available for water years 1998, 1999, 2000 and 2002. Additional information collected includes a 1998 survey of a stream reach and pebble counts of the surface bed material in 1998 and 2000. Figures 1 and 2 show photographs of the reach surveyed in 1998. Figure 1. Bruneau River looking upstream from the downstream end of the surveyed reach. Figure 2. Bruneau River looking downstream from the upstream end of the surveyed reach. Streamflow records are available for 52 complete water years. The average 3 annual streamflow (Qa) for the period of record is 110 ft /s (3.8 in). During the period of record, daily mean discharges ranged from 1.7 ft3/s to 2,070 ft3/s. The highest instantaneous discharge recorded was 2,140 ft3/s on May 14, 1984. Page |2 Channel Profile and Cross-Section The surveyed river segment is about 890 ft. long, beginning about 1.4 miles upstream from the USGS gage. Figure 3 shows the longitudinal profile for the channel bed in the center of the channel, the water surface elevations along each bank at the time of the survey and bankfull flow elevations (floodplains). The average gradient for the study reach is 0.0054 ft/ft. Cross-sections of the channel were surveyed at three locations. Figure 4 shows the channel cross-section (XS29) near the middle of the surveyed reach. 80 Water Surface Elevation Right Bank Bruneau River Center of Channel Bed Elevation 78 Water Surface Elevaton Left Bank Bankfull Elevation Right Side Bankfull Elevation Left Side 76 74 Elevation, ft 72 XS28 XS30 XS29 70 -500 -400 -300 -200 -100 0 100 200 300 400 500 Distance, ft 86 84 Bruneau River Cross-Section 29 82 80 78 Elevation, ft 76 Q 74 Q - water surface at time of survey 72 -40-30-20-100 102030405060708090 Distance, ft Figure 3. Longitudinal profile of the surveyed reach on the Bruneau River. Figure 4. Cross-section 29 of the Bruneau River. Page |3 Channel Geometry The station geometry relationships shown in Figure 5 are for the bridge site located about 3 miles upstream of the USGS gage. Most of the sediment transport measurements were made at this site. Information from stream discharge measurements for 1998 through 2002, that spanned the range of discharges during which sediment transport was measured, were used to develop the power relationships. Over the range of discharges when sediment transport was measured (169 to 744 ft3/s), estimated stream width, estimated average depth and estimated average velocity vary from 39.3 to 50.1 ft, 2.17 to 3.37, and 1.99 to 4.44 ft/s, respectively. 100 10 Bruneau River Width y = 17.048x0.163 R2 = 0.75 10 Average Velocity y = 0.1232x0.542 R2 = 0.96 1 Average Depth 0.296 Width and Depth, ft 1 y = 0.4754x Average Velocity, ft/s R2 = 0.93 0.1 0.1 10 100 1000 Discharge, ft3/s Figure 5. Width, average depth, and average velocity versus stream discharge at the bridge site on the Bruneau River, about 3 miles upstream of the USGS gaging station. Page |4 Channel Material A surface pebble count was made near cross-section 29 of the surveyed reach in October 1998. Additional surface pebble counts were made in October 2000 along three transects in a 455 ft. reach of the river. This reach begins at the tributary junction, just upstream from the bridge used for most sediment transport measurements. The average D50 and D90 for the surface material were 41 mm and 175 mm, respectively in 1998 and 27 mm and 134 mm, in 2000 (Figure 6). About 33% (2000) of the surface material was sand (2 mm) size or smaller. 100 Bruneau River 90 80 70 60 Upstream Transect Middle Transect 50 Percent Finer 40 Downstream Transect 30 20 10 Surface 2000 Surface 1998 0 1 10 100 1000 Particle Size, mm Figure 6. Particle size distribution for surface material collected in the Bruneau River. Page |5 Sediment Transport Sediment transport measurements were made in 1998, 1999, 2000 and 2002. The sediment transport data include 66 measurements of bedload transport and 31 measurements of suspended sediment. Sediment transport measurements spanned a 3 3 range of stream discharges from 169 ft /s (1.56Qa) to 744 ft /s (6.89Qa). Bedload transport ranged from 2.76 to 91.6 t/d and suspended sediment transport ranged from 5.73 to 412 t/d. Over the range of measured discharges, suspended transport accounts for the majority of the material in transport. At the lowest measured discharges predicted suspended transport is about 2.1 times that of bedload and at the highest measured discharge about 8.3 times (Figure 7). 1000 Bruneau River 100 Suspended y = 0.0001x2.235 R2 = 0.61 10 Total Bedload y = 0.0059x1.298 Sediment Transport, tons/day R2 = 0.21 Qa 1 10 100 1000 Discharge, ft3/s Figure 7. Bedload and suspended load transport rate versus discharge. (Bias correction factors for bedload and suspended load transport are 1.327 and 1.134, respectively. Page |6 The bedload transport rates by size class (Figure 8) shows that the larger rates are associated with material in the 0.5 to 2 mm diameter size class. Only 12 samples contained material >32 mm diameter and associated discharges were greater than 363 ft3/s. 100 Bruneau River <0.5mm 1.432 10 y = 0.0004x R2 = 0.37 0.5-2mm y = 0.0028x1.293 R2 = 0.23 1 2-8mm y = 0.0033x1.161 R2 = 0.09 Bedload Rate, tons/day <0.5mm 0.5-2mm 8-32mm 0.1 2.028 2-8mm y = 5E-06x 2 8-32mm R = 0.19 >32mm Qa 0.01 10 100 1000 Discharge, ft3/s Figure 8. Bedload transport rate versus discharge for selected size classes. Page |7 The largest size class in the bedload sample increased with discharge (Figure 9). The largest size class in 12 of the bedload samples was 32-64 mm. This size material 3 was collected at discharges at or above 363 ft /s. The D50 for the bedload samples did not show an increase in size with increasing discharge. The D50 for the majority of the samples was <2 mm. The largest D50 was 34.9 mm associated with a sampling discharge of 369 ft3/s. The largest size class in the bedload sample was often within the range of the median size of the surface material, suggesting that the larger sampled discharges are capable of moving the median diameter particles on the channel surface. 1000 Bruneau River 100 D50 for the three surface pebble counts in 2000 10 R2 = 0.21 Bedload Size, mm R2 = 0.004 1 Qa Median Size Lower end of largest size class 0.1 100 1000 Discharge, ft3/s Figure 9. Lower end of the largest size class in the bedload sample and median size of the sample versus stream discharge for the Bruneau River. Page |8 .
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