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Baroclinicity, Forcing Mechanism and Prediction of Chemical Propagation of San Diego Bay and Their Effects on Naval Ap

Baroclinicity, Forcing Mechanism and Prediction of Chemical Propagation of San Diego Bay and Their Effects on Naval Applications. LCDR Kleanthis Kyriakidis HN Advisor:  Dr. Peter C. Chu Second Reader: Mr. Steven D. Haeger.

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Baroclinicity, Forcing Mechanism and Prediction of Chemical Propagation of San Diego Bay and Their Effects on Naval Ap

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  1. Baroclinicity, Forcing Mechanism and Prediction of Chemical Propagation of San Diego Bay and Their Effects on Naval Applications LCDR Kleanthis Kyriakidis HN Advisor:  Dr. Peter C. Chu Second Reader: Mr. Steven D. Haeger

  2. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications • INTRODUCTION • STUDY SITE • Forcing mechanism • Baroclinicity • WQMAP MODEL • MODEL EVALUATION • CHEMMAP MODEL • CHEMICAL THREAT SCENARIOS • CONCLUSIONS OUTLINE

  3. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications INTRODUCTION/ IMPORTANCE • Littoral Waters: Special Operations, Mine Warfare, Expeditionary Warfare, Object Drift, Search and Rescue, Oil Spill • National Security: Prediction of propagation in case of Chemical Attack or accident • Model evaluations: Requirements for prediction of currents and tides worldwide

  4. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications INTRODUCTION/ PURPOSE • Determine how well 2D depth-integrated models will satisfy certain Navy applications in coastal bays. • Evaluate the models WQMAP - CHEMMAP purchased by NAVOCEANO • Apply the CHEMMAP model in different threat scenarios in San Diego Bay

  5. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications STUDY SITE - SAN DIEGO BAY • Importance: Large City, Host of a significant part of US Navy, near the borders • Oceanographic Interest: Small Tidal Basin, Semi- Enclosed Bay • Advantage: Historic Data Zuniga jetty

  6. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications STUDY SITE - CHARACTERISTICS • Average depth 6.5 m (measured from the mean sea level). Northern/outer part narrower (1-2 km wide) - deeper (up to 15 m) . Southern/inner part wider (2-4 km wide) - shallower (less than 5 m). • Average temperature 21 C (range 14 – 26 C). Average temperature during summer (late June to late August) 23 C. • Salinity (32.5 - 37.5 ppt) and average 35 ppt (in summer 36 ppt).

  7. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications STUDY SITE – FORCING MECHANISMS • Currents produced by tides (“tidal pumping” caused due to the flow difference between ebb and flood). • Winds insignificant effect. Both westerly afternoon winds and easterly morning/ evening winds less than 5 m/sec • Annual precipitation 0.26 m (in summer negligible – less than 0.005 m) . No significant river inflow

  8. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications BAROCLINICITY • Data used : 3 ADCP sites in summer 1993 (SPAWAR) • ADCP /velocity coefficient remarks • Nb1/u 97.16% • Nb1/v 96.32% • Nb2/u 91.89% • Nb2/v 94.71% • Bb/u 35.19% • Bb/v 92.94% • Bb/u 49.53% Filtered • Bb/v 100.00% Filtered

  9. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications BAROCLINICITY – EXCEPTION • u component near point Loma has great differences in surface and bottom. • Reasons for discrepancies: • Relatively open ocean (Influence of California Current as well as influence of Wind ) • Data from ADCP very near to Zuniga jetty

  10. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications WQMAP MODEL MAIN EQUATIONS

  11. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications WQMAP MODEL - APPROXIMATIONS AND BOUNDARY CONDITIONS • Hydrostatic • Boussinesq • Land boundaries assumed impermeable (normal component of velocity set to zero). • At closed boundaries transport of substance (i.e. salinity) is zero. • At open boundaries, concentration specified during the inflow, using characteristic values.

  12. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications MODEL EVALUATION/ VELOCITY COMPONENTS Data/Model comparison: Mean values differences: 0.49–1.29 cm/s Deviation values differences: 0.44 – 6.70 Correlation Coefficient : 91.66 - 92.60% Root Mean Square Error: 6.73–9.02 cm/s Error Coefficient Variation:6.8 – 16.76

  13. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications MODEL EVALUATION/ ELEVATION Data/Model comparison: NOAA SPAWAR M2 (ampl dif) + 2.51 cm + 3.83 cm K1 (ampl dif) - 0.94 cm + 3.73 cm O1 (ampl dif) - 0.84 cm - 2.19 cm S2 (ampl dif) + 0.71 cm - 1.1 cm M2 (ph dif) + 0.75 o - 1.71 o K1 (phdif) - 26.08 o - 25.94 o O1 (ph dif) + 29.58 o - 45.33 o S2 (ph dif) - 48.96 o + 5.41 o

  14. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications MODEL EVALUATION/ CONCLUSION • 2D Model satisfactory for well-mixed areas of the Bay (less accurate for the entrance) • Few Discrepancies due to proximity of ADCPs to the shore, bathymetry errors

  15. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMMAP MODEL • Predicts trajectory/ fate of floating, sinking, evaporating, soluble and insoluble chemicals and product mixtures. • Estimates the distribution of chemical elements on the surface, in the water column and in the sediments. • Langrangian approach

  16. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMMAP MODEL SELECTION OF CHEMICALS

  17. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMICAL THREAT SCENARIOS 12 scenarios (6 chemicals in North and South San Diego Bay) • Methanol (1 barrel released in depth 1m). • Benzene (10 tons in depth 1m). • Ammonia (200 tons in depth 3m). • Chlorobenzene (200 tons in depth 3m). • Trichloroethylene (200 tons in depth 3m). • Naphthalene (200 tons in depth 3m).

  18. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMICAL THREAT SCENARIOS/ RESULTS NORTH SAN DIEGO BAY • In 3 hours: San Diego port/city • In 10 hours: Entire North SD Bay • In 12 hours: Outside SD Bay • In 16-30 hours: Naval Station • In 5 days: Heavy impact on NS • In 20 Days: South Bay • In 32 Days: The entire SD Bay

  19. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMICAL THREAT SCENARIOS/ RESULTS SOUTH SAN DIEGO BAY • In 12 hours: Naval Station • In 15-17days: Small part of absorbed or dissolved chemical in San Diego city/port • After 32 days: No effect to North San Diego Bay Comparison of different chemicals’ results after spilling in South San Diego Bay

  20. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMICAL THREAT SCENARIOS RESULTS FOR FLOATERS • Methanol: after 3 days 45-50% in water column, after 20 days less than 5% - rest decayed. • Benzene: 45% evaporates. After 2 days 30-50% in water column, after 20 days 8-18% - rest decayed. • Ammonia: After 3 days 50-75% in water column, after 20 days 8-18% - rest decayed.

  21. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications CHEMICAL THREAT SCENARIOS RESULTS FOR SINKERS • Chlorobenzene: After 5 days 65 - 97% in water column, after 20 days 50-90% - rest decayed. • Trichloroethylene: After 5 days 60-93% in water column, after 20 days 38-71% - rest decayed. • Naphthalene (gas/air dispersed): After 5 days 33 - 78% in water column, after 20 days 12-33% - rest decayed.

  22. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications APPLICATION CONCLUSIONS Great danger/ vulnerability: • In the North San Diego Bay, contamination of city/port, Bay – small reaction time. • In the South San Diego Bay, contamination only of Southern part (including Naval Station). • When in the South, bigger percentage of chemical and for more time remains in the water column.

  23. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications GENERAL CONCLUSIONS • San Diego purely barotropic • San Diego Bay purely tidal forcing • 2D depth-integrated models should be applied to semi-enclosed, well-mixed, tidal basins. WQMAP - CHEMMAP far from perfect but useful • Discrepancies mainly due to proximity of ADCP sites to shoreline, bathymetry errors

  24. Baroclinicity, Forcing Mechanism and Prediction of chemical Propagation of San Diego Bay and their Effects on Naval Applications RECOMMENDATIONS FOR FURTHER RESEARCH • Use of better bathymetry, finer grid and more recent ADCP measurements (and more distant from the shore). • More detailed comparison of 3D vs. 2D model and application for drift and for instantaneous current prediction. • Classified thesis with data about real chemical threat (e.g. anthrax) - not available to foreigners.

  25. Questions? Questions?

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