Centro de Conservación y Aprovechamiento de los Recursos Naturales (CECARENA), Centro de Conservación y Aprovechamiento de los Recursos Naturales (CECARENA),

Instituto Tecnológico y de Estudios Superiores de Monterrey (ITESM), Campus Guaymas.Instituto Tecnológico y de Estudios Superiores de Monterrey (ITESM), Campus Guaymas.Campus Guaymas

María Esther Cruz Colín, ITESM, Campus GuaymasJuan Antonio Delgado, ITESM, Campus Guaymas/ITMARStephen Monismith, Stanford UniversityArnoldo Valle-Levinson, CCPO, Old Dominion University, VA

Some Observations at Lobos Bay, 2004Some Observations at Lobos Bay, 2004

Environmental Studies for sustainable management of two bays of semidesertic

climate: El Tóbari y Lobos, Sonora, Mexico.

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 equipment’s 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.

•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 work’s Mike)•Proccessing data•Modelling

!

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.

To get spatial variability of temperature, salinity, DO, pH,

monthly

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)

Desarrollo de un modelo numérico

(simulación numérica)

Set in place a Weather

Station

Working at Lobos BayWorking at Lobos Bay

Bahía Lobos

Bahía de Guaymas

Golfo de California

Bahía del Tóbari

Valle del Yaqui: Distrito de Irrigación

Longitude

Latit

ude

ADCP/CTD fix, August,2004

ADCP/CTD fix,

September-October, 2004

ADCP towed

September, 2004, simultaneously

Salinera del Valle

Lobos

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

Bathymetry measurements.

June, 2004Lobos Bay bathymetry, 2004

Some results in Lobos

• Tide: Mixta Diurnal

• Temperature, Salinity, Density: diurnal variability.

• Density is in relation Salinity

cm/s

Spring tide

neap tide

Spring tide

neap tideCurrent (envolvente)

comp V, filtered

Temperature filtered

Residual flux at South inlet

adcp=4 mts

10

20

Win

d S

peed

m/s

Relative H

um

idity

60

80

100

Net Outflow

Net Inflow

S

N

EW

Wind direction

No rain, no tropical storm

Net inflow

Wind direction

rain, tropical storm

Wind direction

rain, tropical storm

Howard, 09/03/2004

N

W E

SNet outflow

cm/s

Spring tide

neap tide

Spring tide

neap tide

Wind Direction from NW

Precipitation

Event anomally

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?

O2 max |ū| max

8

29August, 2004

O2

(mg

/L) |ū

| (m/s)

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.

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 aren´t involve, nevertheless they hold theirs lagoon healty.

Threat, but no impediment Threat, but no impediment

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

Brochure, posters, internet Brochure, posters, internet (web), technical reports(web), technical reports

DiffusionDiffusion

Link with others areasLink with others areas

policy perspectivespolicy perspectives

who

how

what

Acknowledgments

• Researcher (Old Dominion University, UABC, CICESE)• Guaymas’s cooperativas pesqueras• Students, (special thanks to Alyson Santoro, Nick Nidziecko,

Mike Beman, Benjamin, Enrique y Rafael) last intensive measurement the last month.