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Studies of Estuarine Hydrography

Studies of Estuarine Hydrography. Originally : Environmental Studies for sustainable management of two bays of semidesertic climate: El Tobari y Lobos, Sonora, Mexico. Now : Environmental Studies for sustainable management of a bay of Semidesertic Climate: El Tobari. Esther Cruz-Colin,

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Studies of Estuarine Hydrography

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  1. Studies of Estuarine Hydrography • Originally: Environmental Studies for sustainable management of two bays of semidesertic climate: El Tobari y Lobos, Sonora, Mexico. Now: Environmental Studies for sustainable management of a bay of Semidesertic Climate: El Tobari. Esther Cruz-Colin, Juan Antonio Delgado, Arnoldo Valle-Levinson, & Stephen Monismith

  2. Objective • Complete hydrodynamic behavior and physical and chemical characterization for El Tobari and Lobos, two coastal lagoons/estuaries, with the purpose of giving a solid basis for their management and sustainable development (or restoration).

  3. Implement periodic monitoring in both lagoons to detect changes in physical conditions (salinity, circulation,..) which may be important for nutrient cycling, larval transport etc. Develop first picture of how circulation patterns in these shallow estuaries respond to winds, tides, and evaporation - typical for desert-climate coastal lagoons Develop data needed to model these systems Specific objectives

  4. North Mouth Mean = 1.2 cm/s South Mouth January 2000 data Mean = 2 cm/s antecedents

  5. January February 2000 antecedents

  6. Moored south mouth February January 2000

  7. Work to date • We carried an intensive field experiment at each of the mouths of the Tobari in which we measured salinity (CTD) and velocity (ADCP) transects throughout a 24 hour period using small boats. • Additionally we collected time series of salinity, temperature and depth for one month periods at both mouths.

  8. Paredon Colorado Tony’s roof Us schedule of measurements

  9. The transect boat Laptop for real time gps ADCP tools amarre

  10. Camp Tecate

  11. Captains Chuy and Peter

  12. It takes a village to launch a boat..

  13. The buoys were easier to see in the daylight

  14. The iron men…

  15. Boca norte Boca sur Bathymetry (done with ADCP/GPS)

  16. Bathymetry

  17. Wading birds near Boca Norte

  18. October 2002: Boca Norte Transects 4 3 2 1

  19. Transect data analysis • Harmonic analysis (least squares) to extract mean flow, M2 (semidiurnal) and K1 (diurnal) tides from transect data • Look for spatial variability of flows

  20. Mean velocities: Transect 1 Out In Transverse variability important for fluxes

  21. Tidal velocities: Transect 1

  22. Mean velocities: Transect 2

  23. Tidal velocities: Transect 2

  24. Mean velocities: Transect 3

  25. Boca Sur transects: March 2003 4 2 3 Wavy! (muy peligroso)

  26. Mean velocities: Transect 3

  27. Tidal velocities: Transect 3

  28. Tidal velocities: Transect 3

  29. A front in the south mouth

  30. Manuel manually does the CTD

  31. Temperature (ºC) Salinity (ups) ebb flood start ebb start flood endebb

  32. Summary The patterns of circulation are predominantly tidal – Are mean currents (and exchanges) produced by rectification (bathymetry is crucial) or by variations in density (or both)?

  33. Next steps: • Finish processing 2002/03 data • More field work in El Tobari South Mouth • Integrate with Mike’s nutrients and phytoplankton work • 3D model of El Tobari (remove causeway!) • Lobo (harder logistically) • New NSF proposal (see next talk)

  34. The good news is… To continue this project and to accomplish the specific objective for this studies we will get funds from Consejo Nacional de Ciencia y Tecnología (CONACyT)- Secretaría de Medio Ambiente y Recursos Naturales (SEMARNAT). amount: $413,816.00 pesos = $35,984 dlls

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