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

Table 1. Information on tested bedload samplers

Type

Runs in which sampler was tested
with indicated type of bed material

Identification
number

Intake nozzle
entrance
size!

Area
ratio2

Hydraulic
efficiency

6.5 mm

2.1 mm

23.5 mm

Mixture

1'.........---- HS'
2.........----- HS
3-.-...-...---- HS
4---------....- HS
5-----.-.-..... HS
6'_____________ HS
76.__.__....... VUV
8---.......-.--Arnhern
11'..._______.__ HS
12'__________... HS

3X3
3 x 3
3X3
12 x 6
12 x 6
6X6
19.9 x 7.9
3.4 x 2.0
3X3
3 x 3

3.22
1.10
1.40
1.10
1.40
3.22

3.07
3.22
3.22

1.54
sl.15
sU5
'1.15
'1.40
1.54
1.00
1.00
1.54
1.54

1-6
1-4
1-4
1-4
1-4
1-6

1-5
1-5
1-5
1-3
1-3
1-5

1-5
1-5
1-5
1-5
1-5
1-5

1-4
1-3
1-3
1-3
1-3
1-3
4

5,6

4.5

3.5

4
4

lWidth x height. in inches.
2Ratio of nozzle exit area to entrance area.
3Standard design.
4HS. Helley-Smith.

needs to keep in mind that varying quantities of river sand
and fractured material were mixed in the bed material and
were in transport even though the nominal bed-material-size
designations and presented rates do not reflect that fact.

Sampled Bedload-Transport Rates

Sampling variables changed somewhat during the
course of the experimental program. The data in table 3

5Estimated.
6full-scale version.
7Not tethered.
SO.5-mm mesh bag.

indicate, for each run with each bed material, which sam.
piers were used, the order in which they were used, the
number of samples collected with each sampler, the sam-
pling location, the sieve separation size(s), and the data-file
name. Sampling locations are identified by distance up-
stream from the trap (station 0). Transport rates determined
from the samples are characterized in figures 11-18, which
show, for each of the tested samplers during one run with
each of the uniform bed materials, the cumulative relative-

Table 2. General operational schedule by day number
[Day number specifies the number of complete or partial days of actual flume operation; day number 1 is the first day on which the flow and weir height
were adjusted either to load bed material into the flume or to establish conditions for a new run]

Type of
bed material

Run number

Inclusive day numbers {or indicated activity

Flow adjustment

Data collection

6.5 nun--... --...................... 1
2
3
4
5
6
2.1 nun- -- -- -- -- -- -- -- -- -- -- -- - - -- -- I
2
3
4
5
23.5 nun-- - -- -- - -- -- -- -- -- -- -- -- -- -- 1
2
3
4
5
Mixture- ~ - - - - - - - - - - - - - - - - - - - -- - - - - - - I
2
3
4

1-9
1-6
1-2
1-7
1-8
1-2
1-4
1-7
1-2
1-3
1-5
1-4
1-2
1-4
1-2
1-5
1-5
1-3
1-2
I

10-17
7-12
3-9
8-13
9-14
3-9
5-12
8-15
3-9
4-8
6-12
5-13
3-8
5-12
3-7
6-11
6-12
4-8
3-8
2-5

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