Area of Operations: John Day Reservoir, Columbia River, Washington, Oregon, United States, North America Dates: September 13, 2000 to September 28, 2000 Chief scientist: David Twichell
Guy Gelfenbaum (Coastal and Marine program, Western Region)
Mike Parsley (BRD, Cook, WA) Objectives: High-resolution seismic-reflection, sidescan mapping, and sediment sampling of reservoir floor to determine the amount, distribution and types of sediment being trapped. These data are important to understanding changes in salmon spawning grounds and to quantifying changes in sediment supply to the coast. Type of Activity: Sampling
Seismic profiling
Seafloor mapping
Photography Information to be derived: Grain size analysis
Sea Floor Map
Bathymetric Maps
Morphology Summary: Sidescan sonar: 287.7km; Subbottom: 287.7km; Video transects: 48; Sediment samples: 41; Bottom photos: 130 USGS Project Number: 7440-33780
Contact: David Twichell (dtwichell@usgs.gov)
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U.S. Department of the Interior |
U.S. Geological Survey
