Doctoral Thesis
DOI
10.11606/T.3.2008.tde-24112008-150611
Document
Author
Full name
Silene Cristina Baptistelli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Alfredini, Paolo (President)
Arasaki, Emilia
Garcia, Patrícia Dalsoglio
Harari, Joseph
Yassuda, Eduardo Ayres
Title in Portuguese
Análise crítica da utilização de modelagem matemática na avaliação da dispersão de efluentes leves no litoral da Baixada Santista ( Estado de São Paulo).
Keywords in Portuguese
Correntes marinhas
Efluentes (dispersão)
Hidráulica marítima
Modelagem matemática
Abstract in Portuguese
Title in English
The analysis of mathematical models in the assessment of effuents dispersion in Baixada Santista coastline (State of São Paulo).
Keywords in English
Currents circulation
Effluents (dispersion)
Maritime hydraulics
Mathematical modeling
Abstract in English
The prediction of the hydrodynamic water circulation and pollutants dispersion, mainly in coastal areas, has been a problem that engineers have been facing. This is due to the increase environmental impacts that involve coastal engineering work and management. The usage of mathematic modeling as assessment tool is necessary for these studies. The main purpose of this Thesis consists in using hydrodynamics models in order to evaluate the hydrodynamical behavior in the region, and to study the effluents dispersion by approaching the marines pollution issue mainly concerning domestic wastewater, and petroleum byproducts leakage. The study area is located in the Central Coast of São Paulo State, named Baixada Santista. The highlighted area analyzed is Santos / São Vicente Estuarine System. Three hydrodynamics models were used - MIKE 21, POM and Delft3D. This approach presented a significant contribution for the main conclusions of this Thesis, and it shows the differences among the hydrodynamics mathematical models. The three models presented good results, the correlation coefficients that were found for the Summer of 2002 were 0.63 for MIKE 21 (considering 20 days of processing); 0.80 for Delft3D (20 days); and 0.70 for POM (30 days), for Component x (Component E-W of velocity vector). In the Point of Santos / São Vicente Outfall Discharge, the maximum depth average velocity reaches 0.27 m/s, and in first layer (surface) the velocity can reach 0.35 m/s. In the assessment of plume dispersion for this outfall, was used the software CORMIX and the results has shown initial dilution higher than 100 for the velocities of 0.27 and 0.18 m/s; and initial dilution lower than 100 for the velocities of 0.08 and 0.12 m/s. This Thesis contributed to obtain a better knowledge about hydrodynamic mathematic modeling. The research reveals a realistic point of view of the characteristics and limitations, in theoretical and practical terms, existing in each model used, from engineering perspective.

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Publishing Date
2008-12-12

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Centro de Informática de São Carlos