Banca de QUALIFICAÇÃO: DIEGO SANTOS DE ANDRADE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : DIEGO SANTOS DE ANDRADE
DATA : 16/12/2020
HORA: 14:00
LOCAL: Webconferência em meet.google.com/epg-ztpk-ots
TÍTULO:

MODELING THE LOCAL WIND EFFECT ON THE HYDRODYNAMICS OF THE BURANHÉM RIVER ESTUARY AND ITS COASTAL PLUME


PALAVRAS-CHAVES:

Delft3D, numerical modelling, estuarine dynamics, Porto Seguro


PÁGINAS: 70
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Oceanografia
SUBÁREA: Oceanografia Física
RESUMO:

Due to intense urbanization on coastal zones and, at the same time, the increment of anthropogenic polluting sources, the degradatio of water quality on estuarine systems has been resulting in serious enviromental problems on ecossystems. Given this contexto, in order to guarantee a sustainble managing of these estuarine environments, it is essential to carry out studies, such as data analysis and hydrodynamic simulations for a better understanding of these aquatic ecosystems. Thus, this work aims to model the effect of the local wind and its interaction with the river discharge and the tides in the hydrodynamics of the estuary of the Buranhém River (Porto Seguro, BA), and its of its coastal plume. It is also expected to contribute to a better understanding of the physical processes associated with environmental sanitation in this part of the studied aquatic environment. The numeric model Delft3D and its hydrodynamical module (FLOW) has been chosen. The choice of this numerical model is justified by the fact that it is already calibrated and validated for the study area regarding the effect of tides and fluvial discharges, in the dissertation of Rocha (2019). The input data of the FLOW module were bathymetry, fluvial discharge , tide, intensity and wind direction (RedeMET). ON modelling process, the following steps were performed: sensitivity test, calibration (in 2 and 3 dimensions) and model validation. In the calibration step of the 2D model, the calibration adjustments for the physical parameters were bottom roughness, horizontal viscosity and horizontal diffusivity, while in the 3D model, parameters related to vertical discretization were adjusted: coordinate system (sigma and Z), thickness of Z layers, viscosity and turbulent diffusivity. The calibration was performed between the period from 01/08/2015 to 06/08/2015, where the modeled data were compared with the observed data of water level in two locations (Point 1 and 2), surface salinity and bottom (Point 1 and 2), and longitudinal speead (Point 2 only). The model was validated with data collected in a campaign carried out from 08/19/2016 to 08/24/2016, using the same parameters defined in the calibration. In this step, the observed data were compared with the modeled water level data at points 2 and 3; surface and bottom salinity, points 1, 2 and 3; and transversal and longitudinal speed, point 2. To evaluate the consistency of the results, both for calibration and for validation, qualitative analysis was used (graph method) and quantitative analysis (statistical parameters skill and RMSE). In order to evaluate how the inclusion of wind influenced the calibration and validation in the process of hydrodynamic simulations of the study area, the results achieved in this dissertation were compared with the results obtained by Rocha (2019), which has not considered the effect of the wind in the modelling process. In the model’s calibration, there has been an “excellent” agreement of the Skill parameter for the water level (above 0.99) and for the surface and bottom salinity (above 0.89), while for the longitudinal speed it was classified as "very good" (above 0.75). For the validation period, an excellent agreement was reached for all variables: water level (above 0.99), surface and bottom salinity (above 0.71) and longitudinal and transverse speed (above 0.78). The implementation of actual flows and winds (direction and intensity) was an increase in relation to the results achieved by Rocha (2019). The local effect of the wind seems to be, at least for the periods of calibration and validation, secondary in relation to the tides and fluvial discharge in the hydrodynamics of the Buranhém river estuary. Although with real wind data, the increase in the quality of the modeled results was not very significant. However, more conclusive results in this regard still depend on advances in vertical discretization.


MEMBROS DA BANCA:
Presidente - 1649867 - FABRICIO BERTON ZANCHI
Externo ao Programa - 3074889 - ANGELO TEIXEIRA LEMOS
Externo à Instituição - EDUARDO SIEGLE - USP
Notícia cadastrada em: 17/11/2020 09:16
SIGAA | Superintendência de Tecnologia da Informação -   | Copyright © 2006-2024 - UFRN - 6b062eeef8db.sigaa2-prod