FLOOD01191

• County: Statewide
• Title: Laboratory Data on Course-Sediment Transport for Bedload-Sampler Calibrations
• Date: 1/1/1987
• Prepared By: USGS
• Floodplain - Doc Type: Educational/Technical/Reference Information

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Z EXPLANA liON Z EXPLANATION
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U U ----- Run 5. 2.1-mm bed material
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00 '0 2.0 30 '.0 5.0 60 0.0 0.05 0.10 0.15 0.20 0.20 0.30

TRANSPORT RATE, IN POUNDS PER SECOND PER FOOT

Figure 15. Cumulative relative-frequency distribwtion of
bedload-transport rates from samples collected with Helley-
Smith sampler no. 5.

Measured Bedload Transport

The particle-size dislribution of material in transport
was determined by analyzing samples that were collected
from the weigh pans and from the streambed surface after
the water had been drained from the flume. During runs with
Ihe 6.5- and 23.5-mm materials, the entire size distribulion
of each sample was defined. However, with the 2.l-mm

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EXPLANA liON

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- - - - - Run 3, 2.1-mm bed material
- - - Run 3, 6.5-mm bed material
Run 1, 19.9-mm bed material

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10

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TRANSPORT RATE, IN POUNDS PER SECOND PER FOOT

Figure 16. Cumulative relative-frequency distribution of
bedload-transport rates from samples collected with Helley-
Smith sampler no. 6.

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70

TRANSPORT RATE, IN POUNDS PER SECOND PER FOOT

Figure 17. Cumulative relative-frequency distribution of
bedload-transport rates from samples collected with the Am-
hem sampler.

material. in addition to defining Ihe entire size distribution
of regularly collected samples, the percentage of river sand
finer than 1.0 mm in a number of extra samples also was
determined. For the mixture runs, in addition to weigh.pan
and streambed samples, material discharged back into the
upper end of the channel through the Y diffusor was col.
lected and analyzed frequently.

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EXPLANATION
RUN 4, BED.MATERIAL MIXTURE

----- 1.4-to4.0-mmsizefraction
. - - - - - - 4.0- to 8.0-mm size traction
11.3- to 32.Q-mm size fraction

0.0
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0.1

0.2

0.3

0.4

0.5

0.6

TRANSPORT RATE, IN POUNDS PER SECONO PER FOOT

Figure 18. Cumulative relative-frequency distribution of
bedload.transport rates from samples collected with the full-
scale VUV sampler.

12 Laboratory Data on Coarse-Sediment Transport for Bedload-Sampler Calibrations