HR: 1400h
AN: OS23F-07    [Abstracts]
TI: Generation and evolution of internal waves in Banderas Bay, Jalisco-Nayarit, Mexico.
AU: * Plata, L J
EM: luisplata@yahoo.com.mx
AF: Centro Universitario de la Costa, Universidad de Guadalajara, Av. Universidad de Guadalajara 203, Delegación Ixtapa, Puerto Vallarta, Jal 48280, Mexico
AU: Anatoliy, F
EM: afilonov@cencar.udg.mx
AF: Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, esq. Calzada Olímpica, Guadalajara, Jal 44430, Mexico
AU: Iryna, T
EM: itereshc@ccip.udg.mx
AF: Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, esq. Calzada Olímpica, Guadalajara, Jal 44430, Mexico
AU: Carlos, V
EM: cadrian@ccip.udg.mx
AF: Centro de Investigación Científica y de Educación Superior de Ensenada, Km. 107 Carretera Tijuana-Ensenada, Ensenada, BC 22860, Mexico
AU: Liza, K
EM: lizadaniellek@yahoo.com
AF: Centro Universitario de la Costa, Universidad de Guadalajara, Av. Universidad de Guadalajara 203, Delegación Ixtapa, Puerto Vallarta, Jal 48280, Mexico
AU: César, M
EM: monzon@quantum.ucting.udg.mx
AF: Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, esq. Calzada Olímpica, Guadalajara, Jal 44430, Mexico
AB: The characteristics of internal waves in Banderas Bay (Mexico) were determined by means of data from oceanographical measurements carried on spring and winter during the years 2001 and 2003. The intense fluctuations in the fields of temperature and salinity obtained from a fast oceanographical survey with an undulating CTD on April, 2001, give evidence of the presence and propagation of an internal waves' field. With the help of a bathymetric chart elaborated from a survey carried on in March and May, 2002, we found that the submarine canyon close to the southern coast of the bay, from Cabo Corrientes to Mismaloya, acts like a filter that reflects the diurnal internal tide and allows only the entrance of semidiurnal internal tide. The results of a special experiment measuring the spatiotemporal parameters of internal waves on the wide continental shelf of northwestern Banderas Bay are discussed. The oceanographical measurements consisted of: a) a fast survey with an undulating CTD along a transect perpendicular to the coast, (b) the towing of an array of temperature and depth sensors several times over the continental shelf along transects perpendicular to the coast, and (c) time series of velocity components registered by an acoustic Doppler current profiler placed on the seabed of the bay at 28 m depth. The presence of internal waves generated by semidiurnal tide and corresponding to the second normal oscillation mode (according to the linear theory of internal waves) was determined. Analysis of the data showed that, in the study area, the internal waves generated over the continental slope by the barotropic tide have the shape of an oscillatory bore, which quickly disintegrates during their propagation shoreward, producing short nonlinear waves that dissipate close to the coast, and intense vertical mixing of the whole water column. The interpretation of the results was based on the linear and nonlinear (Korteweg-de Vries equation) theories of internal waves.
DE: 4500 OCEANOGRAPHY: PHYSICAL
DE: 4544 Internal and inertial waves
SC: Ocean Sciences [OS]
MN: 2007 Joint Assembly