Accessing Reading Material on Library Reserve Website www lib washington edu Options on left Course Reserves Search by Course Oceanography 230 Search by Professor Nittrouer List of electronic materials for Oceanography 230 Connect to this title on line UW restricted Enter UW net info Accept copyright agreement Reading Material On reserve in Undergrad Library hard copies UW Library website www lib washington edu Ocean Basins from Oceanography M G Gross Prentice Hall River Deltas from The Coast of Puget Sound J P Downing Puget Sound Books Preparation for Mid Term Exam next Wednesday 25 October Review class lectures http gis ess washington edu grg courses05 06 ess230 Reading material www lib washington edu Old exam questions will distribute on Friday Field Trip B Working cruise in Puget Sound on the Thompson UW s oceanographic research vessel Wednesday October 18 start 7AM All day no class end 9PM Puget Sound Cruise Time Depart UW 7AM Johnson Hall Parking Lot Return UW 9 PM Johnson Hall Parking Lot Clothing foul weather gear hat fleece good shoes Prepare for cold wet windy and muddy conditions Food Lunch and dinner onboard ship Special dietary needs Observations during cruise Water column CTD chlorinity temperature depth turbidity suspended sediment Seabed Grab samples surface sediment box core 50 cm long piece of seafloor kasten core 250 cm long record of sedimentation Seafloor mapping multibeam acoustic profiles Below seafloor Puget Sound Morphology Glacial Origin scour flow under ice sheet formed depressions e g Main Basin Hood Canal Lake Washington sedimentary deposits also raised land surface glacial tills outwash deposits lake deposits old glacial sediment now provides new input to PS cliff erosion Bathymetry water depth Shallow entrance glacial origin moraine oceanographic name sill primary sill is Admiralty Inlet Several others divide PS into separate basins 200 m Main Basin has 46 of water volume Sinuous shape result of origin Southern Basin has 29 of shorelines Fluvial river sediment supply fills PS from shoreline Hydrography water properties Salinity amount of salt dissolved in water river water has 0 ppt parts per thousand ocean water has 35 ppt differs around world brackish water at depth in PS 20 30 ppt Density low salinity low density river plume flows over more dense brackish water Input of river water varies with space and time northern PS rivers supply the most water small input during late summer Types of river mouth environments estuary semi enclosed setting river and salt water meet and mix fjord estuary with glacial origin deep with shallow sill near mouth delta river mouth receiving much sediment estuary filled with sediment shoreline growing seaward Puget Sound Sedimentation Sources of sediment shallow shoreline erosion landslides deep biological productivity algal debris much carbon decomposes forming methane gas all depths river discharge deltas form near river mouths river plume carries sediment deeper Mechanisms associated with Sedimentation plume transport turbid surface water river momentum tides wind flocculation silt and clay particles form larger aggregates which sink quickly landward bottom flow traps sediment near river delta formation thick deposits near river mouth topset tidelands foreset steep surface rapid Duwamish delta Intensely impacted by humans Wetlands hardened landfill roads parking lots buildings Distributary channels altered and stabilized depth in m Duwamish delta 4 m resolution 5x VE Nisqually delta nearly natural condition Several distributary channels bring water and sediment across delta to Puget Sound depth in meters Nisqually Delta 5x VE 3 m resolution looking SW
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