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Field surveys will be conducted at instrument development and testing phases to compare data obtained from different sources (PIV and microstructure profilers). St. Augustine Inlet (Florida) and the Penobscot River (Maine) have been selected as the field sites because of their energetic currents (>1 m/s) and the high spatial variability in flows. These characteristics (high turbulence, varying spatially over scales of order 100 m) allow observations under difference regimes of turbulence. Tidal cycle duration field surveys will be conducted during spring and neap tidal conditions to account for various stratification and current speed, and hence turbulence, conditions. The preliminary surveys will evaluate specifics related to ROV design including variation of current speed, wave loads, buoyancy and morphology. Stratification and turbulence properties will be also determined for PIV specific design considerations. Instrument testing field surveys function to evaluate ROV and PIV performance, as well as verify data quality of the paired system. Specifics include testing ROV maneuverability, vibrations and accelerations. Current velocity and turbulence properties will be validated with other oceanographic equipment, including towed ADCPs, moored 5-beam ADCPs and microstructure profilers (SCAM & VMP). List of researchers potentially interested in the technology: Ivan Perez, University of Concepcion, Chile Carlos Augusto Schettini, Federal University of Pernambuco, Brazil Lauren Ross & Aldo Sottolichio, University of Bordeaux, France Lars Ulauf, Baltic Sea Research Institute, Germany Robert Chant, Rutgers University Sarah Giddings, SCRIPPS Inst of Oceanography Stephen Monismith, Stanford University Mark Stacey, University of Berkeley Jim Lerczak, Oregon State University Rocky Geyer, WHOI Dave Ralston, WHOI Nick Nidzieko, Univ of Maryland (soon to move to U of California, Santa Barbara) Topics to investigate: Tidal asymmetries in vertical mixing in estuaries. These are thought to produce residual circulation that competes or reinforces that produced by density gradients. Observations are still needed to corroborate this idea. Lateral variability of mixing. Investigate mixing processes associated with lateral circulation. Mixing at bathymetric gradients. Investigate mixing associated with instabilities in the water column related to pycnocline instabilities that appear at bathymetric gradients.
