Centro de Conservaci

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Environmental Studies for sustainable management
of two bays of semidesertic climate El Tóbari y
Lobos, Sonora, Mexico.
Some Observations at Lobos Bay, 2004
María Esther Cruz Colín, ITESM, Campus
Guaymas Juan Antonio Delgado, ITESM, Campus
Guaymas/ITMAR Stephen Monismith, Stanford
University Arnoldo Valle-Levinson, CCPO, Old
Dominion University, VA

• Centro de Conservación y Aprovechamiento de los
  Recursos Naturales (CECARENA),
• Instituto Tecnológico y de Estudios Superiores de
  Monterrey (ITESM), Campus Guaymas.

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Start in Lobos (2004)

• February CONACyT funds arrive.
• ADCP update (sent it to RDI -San Diego
  delayed 3 months almost!), bought OD and pH
  CTD sensor.
• May Set in Lobos weather station
• June Bathymetry
• July Proceessing data of Tobari, and Lobos
• August 35 days mooring at South inlet Lobos
• September (21-25) Simultaneous transects at
  Lobos inlets (we use equipments Tec and Old
  Dominion University).
• October 35 days mooring at North inlet Lobos
  (now is there).
• Attend to XII International Conference on
  Physics of Estuaries and Coastal Seas, 2004.
  Mérida, Yucatán, Mex.

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!

• At its first part we worked in Tobari bay (2003),
  but we not finish yet, fault take sediments
  samples to distinguish the bottom sediments (to
  acomplish works Mike)
• Proccessing data
• Modelling

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What do we expect to find?

• Some likeness Tóbari (or not).
• Delucidate who is responsible currents tide,
  wind, density or bathymetry.
• Tools to understand the sediments, larvas,
  nutrients transport.

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Working at Lobos Bay
Set in place a Weather Station

• Desarrollo de un modelo numérico
• (simulación numérica)

Bathymetry (mapping)
Hydrodgraphy Measurements at the mouths (to get
the spatial an temporal of the water circulation
at boths mouths
Take a sediments samples (in order to description)
To get spatial variability of temperature,
salinity, DO, pH, monthly
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ADCP/CTD fix, September-October, 2004
Latitude
Lobos
ADCP towed September, 2004, simultaneously
Salinera del Valle
ADCP/CTD fix, August,2004
Longitude
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Laying the weather station at salt fabric
(Salinera del Valle, S.A. de C.V. Thanks to
Francisco Fernández Ortega, owner-chief manager)
Start to measure from beginning May, 2004. dt
15 mins. Temperature, wind, HR, DewPt, Bar, Rain,
UV, SolaRad, ET
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• Bathymetry measurements.
• June, 2004

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Some results in Lobos

• Tide Mixta Diurnal
• Temperature, Salinity, Density diurnal
  variability.
• Density is in relation Salinity

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Residual flux at South inlet
Spring tide
Spring tide
Current (envolvente)
neap tide
neap tide
comp V, filtered
cm/s
Temperature filtered
adcp4 mts
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100
80
60
20
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Net Inflow
Net Outflow
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Net inflow
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Wind direction rain, tropical storm
Net outflow
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Event anomally
Spring tide
Spring tide
neap tide
neap tide
Wind Direction from NW
cm/s
Precipitation
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1. Which mechanics produce this correlation?
2. Must be a physical process to gain O2 and
   biological to lost?
3. Why O2 decreases in a few time?

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Rhumb (hypotesis)

• This suggest us that the residuals currents at
  Lobos are driven by synoptics wind principally.
• Due to high currents magnitudes the
  stratification is low.
• Lobos observations will be a tool to demonstrate
  that the causeway has been changed the residual
  circulation, producing a quick siltation.

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Threat, but no impediment

• Yaquis are not same Mayos.
• They are agree we make a project in Yaqui
  lagoon.
• They know the project (we give them a talk
  about).
• However they have a few lack of interesting and
  they arent involve, nevertheless they hold
  theirs lagoon healty.

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policy perspectives

• Information available to who incumbent in the
  project (TEC, Stanford, SEMARNAT, CONACyT,
  municipality, community, whos will be beneficiary

who
Brochure, posters, internet (web), technical
reports
what
Diffusion Link with others areas
how
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Acknowledgments

• Researcher (Old Dominion University, UABC,
  CICESE)
• Guaymass cooperativas pesqueras
• Students, (special thanks to Alyson Santoro, Nick
  Nidziecko, Mike Beman, Benjamin, Enrique y
  Rafael) last intensive measurement the last month.