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ID
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R-1-94-GC
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Abstract
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Chief Scientists: Roberto Anima, Mike Marlow. Data
(mudseis, Kleinsidescan, Geopulse, underwatertelevision,
bathymetry) of field activity R-1-94-GC in Colorado River
from 04/19/1994 to 05/13/1994
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Project/Theme
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Colorado River Sand Distribution Monitoring
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| National Plan
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Resource, environment
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Chief Scientist
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Roberto Anima
Mike Marlow
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Platform
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Raft
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Area of Operation
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Colorado River, Grand Canyon
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Bounding Coordinates
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37.75000
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-115.75000 -110.25000 |
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35.25000 |
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Dates
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04/19/1994 (JD 109) to 05/13/1994 (JD 133)
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Analog Materials
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list
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Crew
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Equipment Used
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mudseis
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Kleinsidescan
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Geopulse
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underwatertelevision
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bathymetry
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Purpose
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Four goals:
1. Image the river bed to determine areas within the pools where sediment
accumulation is taking place using side-scanning sonar;
2. Image the thickness of the sediment accumulation over bedrock and talus;
3. Gather underwater video of the sediment type and bedform type imaged with
the side-scanning sonar as groundtruthing;
4. Gather bathymetric profiling data to be used both for geophysical record
interpretation and for mapping of the river bottom by personnel of Water
Resources Division.
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Summary
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The cruise was a complete success. All sought after goals were met with
excellent results from all systems used.
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Notes
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Associated activities with Grand Canyon Sedimentologic Engineering:
R-1-96-GC
R-2-96-GC
R-1-97-GC
Associated activities with Colorado Sand distribution Monitoring:
R-1-94-GC
R-1-98-GC
R-1-99-GC
R-1-00-GC
R-3-00-GC
R-4-00-GC
Cruise Summary Notes (modified from 5/27/94 USGS Bulletin)
Recently returning from the Colorado River, Roberto Anima, Mike Marlow, Dave
Hogg, and Kaye Kinoshita report that wind, rain, hail, and heat, were
encountered during an extremely successful geophysical data collection cruise.
The team collected digitized high-resolution geophysics and side-scanning sonar;
fathometer, and underwater video to measure the extent of sediment stored along
fourteen reaches of the Colorado River corridor.
The project is part of the Grand Canyon Environmental Study (GCES) that is
investigating the effects of fluctuating river discharge (controlled by Glenn
Canyon Dam) on the river's ecosystem.
USGS's involvement is to look at the sediment supply along the corridor.
The initial results of the survey revealed that approximately 3 to 9 meters of
sediment cover bedrock or talus along many of the reaches, and that the amount
of talus in the river, from the margins, greatly effects the amount of sediment
cover.
Dave Hogg, Fred Paine, Mike Boyle and the rest of the ET shop did an outstanding
job of preparing all the electronics and boxing the equipment for the wet and
bumpy conditions encountered in the rapids.
Only two very minor wiring problems occurred during the 21 days of surveying.
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Publications
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Anima, Roberto J, Marlow, Michael S, Rubin, David M. Hogg, David J., 1998,
Comparison of sand distribution between April 1994 and June 1996 along six
reaches of the Colorado River in Grand Canyon, Arizona:
U.S. Geological Survey open-file report 98-141.
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Got Help?
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For R-1-94-GC, we would appreciate any information on -- activity type, contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, NGDC Info, organization, owner, ports, project number, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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