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Items below are listed from most recently updated to least recently updated.
These are results 1 through 25 of 58 matches.
Publication Scientific Investigations Report 2008-5127: Channel Evolution on the Lower Elwha River, Washington, 1939-2006 |
Publication Open-File Report 2004-1447: A Preliminary Assessment of Geologic Framework and Sediment Thickness Studies Relevant to Prospective US Submission on Extended Continental Shelf |
Publication Data Series 366: Multibeam Sonar Mapping and Modeling of a Submerged Bryophyte Mat in Crater Lake, Oregon |
Educational Materials Tsunami and Earthquake Research at the USGS |
Publication Open-File Report 2008-1327 - Interferometric Sidescan Bathymetry, Sediment and Foraminiferal Analyses; a New Look at Tomales Bay, California |
Publication Data Series 288: Beach Morphology Monitoring in the Elwha River Littoral Cell, 2004-2006 |
Publication Data Series 320: Sea-Floor Mapping and Benthic Habitat GIS for the Elwha River Delta Nearshore, Washington |
Publication Scientific Investigations Report 2008-5009: Evaluation of a Single-Beam Sonar System to Map Seagrass at Two Sites in Northern Puget Sound, Washington |
Research Project Coastal Change Hazards: Hurricanes and Extreme Storms |
Educational Materials USGS Coastal Change Hazards |
Educational Materials Coastal and Marine Knowledge Bank |
Publication Ocean Drilling Program Leg 204 Scientific Results: Physical Properties of Repressurized Sediment from Hydrate Ridge |
General Information El Niño Home Page |
Research Project National Assessment of Coastal Change Hazards |
Research Project National Assessment of Shoreline Change Project |
Description: Time-series and spatial measurements of nearshore hydrodynamic processes and water properties were made in the Swinomish Channel to quantify the net direction and rates of surface water transport that influence habitat for juvenile Chinook salmon along their primary migratory corridor between the Skagit River and Padilla Bay in northern Puget Sound, Washington. During the spring outmigration of Skagit River Chinook between March and June 2007, currents measured with fixed acoustic doppler current profilers (ADCP) at the south and north end of the Swinomish Channel and with roving ADCP revealed that the currents are highly asymmetric with a dominant flow to the north (toward Padilla Bay). Maximum surface current velocities reached 1.5 m/s and were generally uniform across the channel near McGlinn Island Causeway. Transport times for surface water to travel the 11 km from the southern end of Swinomish Channel at McGlinn Island to Padilla Bay ranged from 2.1 hours to 5.5 days. The mean travel time was ~1 day, while 17 percent of the time, transport of water and passive particles occurred within 3.75 hours. Surface water in the Swinomish Channel during this time was generally very saline 20-27 psu, except south of the Rainbow Bridge in the town of La Conner where it ranged 0-15 psu depending on tide and Skagit River discharge. This salinity regime restricts suitable low salinity (<15-20 psu) surface waters for fry Chinook salmon to the southernmost 2 km of the channel. The mean change in salinity along the channel was 10-13 psu. The high northward current velocities have the capacity to transport Chinook fry into less suitable, high-salinity waters toward Padilla Bay within hours. The rapid transport times of 2.1 to 3.75 hours between McGlinn Island and Padilla Bay that occur 17 percent of the time, are considerably less than the time considered adequate for juvenile Chinook to acclimate and produce a temporal salinity gradient for pre-smolt salmon that can exceed 4 psu/hour during high northward current flow.
Publication Data Series 260: Beach Morphology Monitoring in the Columbia River Littoral Cell: 1997-2005 |
Publication Open-File Report 2004-1101: Catalog of research activity numbers and associated Publication Numbers, OF2004-1102 thru 1188 - USGS WCMG |
Publication Open-File Report 2006-1318: Deschutes Estuary Feasibility Study; Hydrodynamics and Sediment Transport Modeling |
Publication Seaside, Oregon, Tsunami Pilot Study GIS, USGS Data Series 236, home page |
Publication Data Series 182, 2006: usSEABED: Pacific Offshore Surficial-Sediment Data Release |
Publication USGS Open-File Report 2005-1027, An Operational Mean High Water Datum for Determination of Shoreline Position from Topographic Lidar Data, Title Page |
Publication Open-File Report 2006-1234 - Seaside, Oregon Tsunami Pilot Study--Modernization of FEMA Flood Hazard Maps |
General Information USGS Coastal and Marine Geology - usSEABED |
Research Project Research Projects - National Seafloor Mapping and Benthic Habitat Studies: Pacific |
These are results 1 through 25 of 58 matches. | |
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