Simulations of Coastal Dispersal and Creek Runoff

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Simulations of Coastal Dispersal and Creek Runoff. Collaborators: Leonel Romero (UCSB) Jim McWilliams (UCLA) , Yusuke Uchiyama (Kobe University ), and Carter Ohlmann (UCSB). Work in Progress. Coastal dispersion nearshore
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Simulations of Coastal Dispersal and Creek Runoff
  • Collaborators: Leonel Romero (UCSB) Jim McWilliams (UCLA) , Yusuke Uchiyama (Kobe University), and Carter Ohlmann (UCSB)
  • Work in Progress
  • Coastal dispersion nearshore -Characterization of lateral dispersal within 15 km from the coast in Southern California -Bays vs Headlands: coastal geometry, depth, current variability and a measure of the strain due to eddies. -Simple scalings and parameterization of the relative dispersion nearshore 2) Creek runoff simulation from Mission Creek and Arroyo Burro in the Santa Barbara Channel
  • Three significant storms in January 2008
  • Characterization of the plume with different metrics
  • Temporal mean, distribution of maximum concentration, period exceeding a threshold (lethal dose)
  • Spatiotemporal evolution of freshwater plumes.
  • Regional Ocean Model System (ROMS) Nested Configuration Downscaling: 5km1 km 250 m 100 m* Buijsman et al. 2011 Surface Salinity and Vertical Vorticity Innermost solution (100 m – resolution) embedded in parent solution (250m ) +
  • Vertical Vorticity normalized by the Coriolisparameter
  • web link: http://youtu.be/Uo389p_g8aY
  • Coastal Discharge Model
  • Regional Ocean Model System (ROMS) -River runoff (boundaries) and effluent flow (bottom)
  • Input parameters:
  • Discharge , tracer concentration, temperature, and salinity.
  • Current work in SBC (Arroyo Burro and Mission Creek)
  • Inputs: LTER data discharge, temperature, salinity=0, tracer concentration at the source =1.
  • The discharge is distributed across three pixels (100x100m) and over 1.5 m of water (min depth)
  • Winter 2008/2008 Hydrographs at Arroyo Burro and Mission Creek Hydrograph from Arroyo Burro (Jan. 2008) Net volume discharge from each storm at Arroyo Burro is about 6 x 105 m3 River Runoff from Arroyo Burro and Mission Creek -Simulation of Vertically integrated tracer concentration (or freshwater fraction) Period shown: Dec 27, 2007 – Feb 20, 2008 http://youtu.be/LHyd9_Y_OPs Mohawk Reef Arroyo Burro Mission Creek River Runoff from Arroyo Burro and Mission Creek Simulation of Vertically integrated tracer concentration (or freshwater fraction) Period shown: Dec 27, 2007 – Feb 20, 2008 http://youtu.be/99um5DNbQw8 Mean and Maximum Freshwater Fraction per Storm Arroyo Burro discharge Mission Creek discharge Averaging Interval Mohawk Reef Arroyo Burro Mission Creek Duration of Tracer Exceeding 1% Arroyo Burro discharge Mission Creek discharge Time Interval Mohawk Reef Arroyo Burro Mission Creek Spatiotemporal Distributions Arroyo Burro Mean distributions calculated over 5 km from the coast and within 30 km from the creek along-shelf. 1st storm in January 2008. Spatial Anisotropy Cross-shelf Along- shelf *Degree of anisotropy ~ 10 (c.f. Romero et al. 2013) Storms in January 1st 2nd 3rd Future and Ongoing Work
  • Increase the number of storms: 2004/2005
  • (Collaboration with Charles Jones, UCSB – meteorological forcing)
  • Analysis of the flow fields including statistics, and vertical structure of the plumes.
  • Characterization of dilution field: distance and direction from the source, current variability, straining by eddies, and wind stress.
  • Quantification of the along- and cross-shelf diffusivity based on the spatiotemporal evolution of the dilution field (diffusion model)
  • Quantification of the diffusivity based on moments of the dilution fields.
  • Simple model describing the dilution field with parametric dependent on respect to the discharge rate, wind stress, current variability, and straining by eddies.
  • 3D Plume Structure ocean surface (a) Vertical Cross Sections (b) (e) (c) (f) (d) (g) Eddy Kinetic Energy
  • Headlands have more energy than Bays by up to a factor of 10.
  • Particle Release Strategy and Regions “Bays” “Headlands”
  • About 1000 particles are released near the surface (10m depth) every half a day and are tracked for about 5 days.
  • Two release sites per geographic region
  • Releases are repeated continuously for one season (4 months)
  • Two-particle statistics within each of the predetermined regions
  • Sample Particle tacks
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