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Metadata
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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
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Location map
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Bounding Coordinates
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37.75000
-115.75000 -110.25000
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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Index map
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Crew
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Roberto Anima
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Chief Scientist, USGS Western Region
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Mike Marlow
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Chief Scientist, USGS Western Region
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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:
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1. Image the river bed to determine areas within the pools where sediment
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accumulation is taking place using side-scanning sonar;
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2. Image the thickness of the sediment accumulation over bedrock and talus;
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3. Gather underwater video of the sediment type and bedform type imaged with
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the side-scanning sonar as groundtruthing;
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4. Gather bathymetric profiling data to be used both for geophysical record
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interpretation and for mapping of the river bottom by personnel of Water
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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:
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R-1-96-GC
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R-2-96-GC
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R-1-97-GC
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Associated activities with Colorado Sand distribution Monitoring:
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R-1-94-GC
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R-1-98-GC
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R-1-99-GC
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R-1-00-GC
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R-3-00-GC
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R-4-00-GC
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Cruise Summary Notes (modified from 5/27/94 USGS Bulletin)
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Recently returning from the Colorado River, Roberto Anima, Mike Marlow, Dave
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Hogg, and Kaye Kinoshita report that wind, rain, hail, and heat, were
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encountered during an extremely successful geophysical data collection cruise.
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The team collected digitized high-resolution geophysics and side-scanning sonar;
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fathometer, and underwater video to measure the extent of sediment stored along
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fourteen reaches of the Colorado River corridor.
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The project is part of the Grand Canyon Environmental Study (GCES) that is
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investigating the effects of fluctuating river discharge (controlled by Glenn
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Canyon Dam) on the river's ecosystem.
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USGS's involvement is to look at the sediment supply along the corridor.
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The initial results of the survey revealed that approximately 3 to 9 meters of
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sediment cover bedrock or talus along many of the reaches, and that the amount
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of talus in the river, from the margins, greatly effects the amount of sediment
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cover.
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Dave Hogg, Fred Paine, Mike Boyle and the rest of the ET shop did an outstanding
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job of preparing all the electronics and boxing the equipment for the wet and
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bumpy conditions encountered in the rapids.
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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,
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Comparison of sand distribution between April 1994 and June 1996 along six
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reaches of the Colorado River in Grand Canyon, Arizona:
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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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