tailieunhanh - Geography and Oceanography - Chapter 19

Autonomous underwater vehicle – a robot!Flies by changing its buoyancy – takes on water, becomes heavy and sinks – wings turn vertical motion into forward motion – expels water, becomes light and rises – flies saw tooth pattern through the ocean – from the surface to 3 m off bottom (200 m max) | Using Gliders to Monitor Oregon’s Coastal Ocean OSU Glider Group: Kipp Shearman, Jack Barth, Anatoli Erofeev, Tristan Peery, Justin Brodersen and Laura Rubiano-Gomez Autonomous Underwater Gliders Describe the OSU glider operations What are we learning? The Future of Ocean Observing Kipp Shearman College of Oceanic & Atmospheric Sciences Oregon State University What’s a glider? Autonomous underwater vehicle – a robot! Flies by changing its buoyancy takes on water, becomes heavy and sinks wings turn vertical motion into forward motion expels water, becomes light and rises flies saw tooth pattern through the ocean from the surface to 3 m off bottom (200 m max) Slow, but can stay out a long time ½ - 1 knot 3-4 week endurance GPS for positioning Communicates to home by Iridium satellite phone Collects same data you would on a research vessel at a fraction of the cost Research vessel: approx. $20K/day Glider: $100K to buy + $200/day (batteries + communications + techs) 400 days of glider operation: 400 days x $20K/day – ($100K+400 days x $200/day) = $ million saved! CTD Optical Sensors (Chl, CDOM and Backscatter) Pitch Batteries Science Bay Displacement Pump Glider Control and more batteries Air bladder Aanderaa Optical Dissolved Oxygen sensor GPS, Iridium and Freewave Antennae in tail fin Webb Slocum Electric Glider 7 ft long 100 lbs in air Glider Bob February 2005 Bob Smith Jane Huyer Glider Jane June 2005 The OSU Glider Fleet Two Webb gliders 200 m depth 3 week deployment SeaGlider (Aug 2007) 1000 m depth 6 month deployment Two new SeaGliders (Jul 2008) Newport Line 90 km cross-shelf Strong currents (50+ cm/s) Complex Bathymetry Historical Observations (1950s) Umpqua River Line Summer 2007 Apr 2006 – May 2010 1275 glider-days 32,388 km 481 cross-shelf sections 125,283 vertical profiles OSU Glider Operations Glider Sections 2-5 days per section 100 – 500 m along track resolution 0 to ~3 mab (200 m max) Surface every 6 hrs to get GPS fix, download data and receive . | Using Gliders to Monitor Oregon’s Coastal Ocean OSU Glider Group: Kipp Shearman, Jack Barth, Anatoli Erofeev, Tristan Peery, Justin Brodersen and Laura Rubiano-Gomez Autonomous Underwater Gliders Describe the OSU glider operations What are we learning? The Future of Ocean Observing Kipp Shearman College of Oceanic & Atmospheric Sciences Oregon State University What’s a glider? Autonomous underwater vehicle – a robot! Flies by changing its buoyancy takes on water, becomes heavy and sinks wings turn vertical motion into forward motion expels water, becomes light and rises flies saw tooth pattern through the ocean from the surface to 3 m off bottom (200 m max) Slow, but can stay out a long time ½ - 1 knot 3-4 week endurance GPS for positioning Communicates to home by Iridium satellite phone Collects same data you would on a research vessel at a fraction of the cost Research vessel: approx. $20K/day Glider: $100K to buy + $200/day (batteries + communications + techs) 400 days of glider .