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<br />Steady Flows During
<br />Aerial Overflight
<br />
<br />
<br />Final Report
<br />1.00
<br />
<br />NAU Sand Bar Studies
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<br />e Suspended Silt and Clay
<br />A Suspended Sand
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<br />Sopt. 7
<br />Peria A.
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<br />1997
<br />
<br />Figure 4, Suspended sediment concentrations and instantaneous discharge at the lower Marble
<br />Canyon gage from August 28 through September 18, 1997, Also shown is the instantaneous discharge
<br />at the Paria River gage for the period,
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<br />simultaneous with, or foUowed by, fining of both the sand in suspension and on the bed (Topping et
<br />aI,,2000b), These data suggest that a substantial portion of the Paria River-supplied sand was passing
<br />the lower Marble Canyon gage within days. Approximately 56,000 m3 (0,15 :t 0,03 million Mg) of
<br />sand or about 7% of the flood-supplied sand was exported from Marble Canyon during the 25 days of
<br />sampling,
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<br />GEOMORPIDC EFFECTS OF THE 1997 TEST FLOW
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<br />Daily Changes in the 3-km Reach Downstreamfrom the Paria River
<br />Daily and hourly rates of bed and eddy bar adjustment were examined in Segments 3 and 4 of the
<br />3-krn study reach during the 1997 Test Flow, The increase in flow resulted in a stage elevation
<br />increase of nearly I m, Additional sediment was eroded from Segments 3 and 4; 16,240 m3 (0,028
<br />million Mg) of sand was eroded from Segment 3 and 11,610 m3 (0,02 million Mg) of sand was eroded
<br />from Segment 4 (Table I), The erosion of the bed in Segment 3 mostly occurred during the first 15
<br />hours of peak flow, In Segment 4,3,860 m3 of sand were eroded from Eddy 3 during the first 15
<br />hours, and this sand probably was deposited in the adjacent plunge pool. This conclusion is based on
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<br />19
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