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WSP09464
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Last modified
1/26/2010 2:53:49 PM
Creation date
10/12/2006 3:39:06 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.10.D
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
5/24/2000
Author
Hazel et al.
Title
Sand Deposition in the Colorado River Ecosystem from Flooding of the Paria River and the Effects of the Nov 1997 Glen Canyon Dam Test Flow
Water Supply Pro - Doc Type
Report/Study
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<br />1 <br /> <br />NAU Sand Bar Studies <br /> <br />Final Report <br /> <br />1. <br /> <br />104 <br /> <br /> <br />/ <br />,I <br /> <br />102 <br /> <br />-100 <br />E <br /> <br />Reattachment Bar <br /> <br />--1274m3/s-----------------------= <br />I ..._____________; _ ____ <br />--878m3" -----/'-- ,,11iP' <br />/ dl:(l[W'/ <br />--s66m3/s---- . ..t <br /> <br /> <br />~ <br /> <br />c: <br />,!;! 98 <br />.. <br />> <br />.!!! <br />UJ 96 <br /> <br />94 <br /> <br /> <br />. Deposition <br />umm Erosion <br /> <br />02/16/96 <br />-------------" 0"/17/96 <br />------- 08/26/97 <br />................-.......... 11/08/97 <br />---------- 04/16/98 <br /> <br />>. <br />I:~ <br /> <br />92 <br />150 <br /> <br />140 <br /> <br />130 <br /> <br />120 <br /> <br />110 <br /> <br />100 <br /> <br />90 <br /> <br />, <br />Ii <br />" <br />.:'1 <br />f-I <br />'., <br /> <br />Distance From Right Bank (m) <br /> <br />I <br /> <br />. <br />t <br />., <br /> <br />Figure 8. Selected cross section of the high-elevation part of the sand bar at site #30 in upper Marble <br />Canyon, Elevation datum is arbitrary, Flow stage elevations for high-elevation (566 m3ts), the 1997 <br />Test Flow (878 m3ts), and the 1996 Controlled Flood (1,274 m3ts) are shown, Erosion and deposition <br />as a result of the 1996 Controlled Flood and the 1997 Test Flow are depicted, Location is shown in <br />Fig, 1. <br /> <br />H <br />. <br />:-. <br /> <br />~ <br />~~; <br />" <br />if <br />~~ <br />;~ <br /> <br />concentrations in the main channel at the lower Marble Canyon gage (discussed earlier), suggests that <br />the stage change during the 1997 Test Flow was not high enough to redistribute sand to areas where <br />depositional sites were open, Hazel et ai, (1999) show that the stage elevations reached during the <br />1996 Controlled Flood inundated areas where space was available for deposition, termed <br />"accommodation space," and differences in depositional thickness were directly correlated with the <br />magnitude of stage change in Marble Canyon, The stage change during the 1997 Test Flow was <br />roughly half that of the 1996 Controlled Flood in Marble Canyon (Fig, 9). <br />Sediment deposited during the 1997 Test Flow was sampled vertically in trenches at 11 of the <br />study sites (Fig, 10), The new deposits were less than I m thick above the 566 m3/s stage elevation <br />and were typically composed of fine-grained climbing ripple stratification, The deposits lacked the <br />coarser-grained cross bedding that characterized the top portion of the 1996 Controlled Flood deposits <br />described by Rubin et ai, (1998), However, the same upward-coarsening trend described by Rubin et <br />ai, (1998) was observed (Topping et ai" 2000b). With the exception of one out of 11 sites, the mean <br />grain size increased upward by the same factor of two, from 0,015-0,15 mm at the base to 0,065-0.24 <br />mm at the top of the deposits, <br /> <br />~ <br />"f <br /> <br />i <br /> <br />; <br />" <br /> <br />~ <br />~ <br /> <br />~ :.:. <br /> <br />.. <br />., <br />~ <br />~, <br />Ii <br />,:1 <br />;0:. <br />':';.,- <br /> <br />/1' <br />"0'1 <br /> <br />,I <br />I <br />1 <br /> <br />25 <br />
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