MODELAGEM DA CAPACIDADE DE SUPORTE DA LAGUNA DE SAQUAREMA RJ APÓS A ABERTURA DE UMA CONEXÃO PERMANENTE COM O MAR
Lagoa
Saquarema(RJ)
Impacto antrópico
Laguna costeira
Eutrophication
Lagoon
Saquarema (RJ)
Coastal lagoon
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS
Abstract
Saquarema municipality has been subject to a slower urbanization and a less advanced
degradation in comparison to other regions of the Região das Baixadas Litorâneas.
Nevertheless, its lagoonal system has been threatened by uncontrolled urban expansion
leading to an accelerated closure of its natural sand bar. The solution proposed by the SERLA
foundation was the construction of a groin and the channel dredging, that was finished in the
beginning of 2003. The objective of this work was the evaluation of the water quality changes
due to the bar opening and, through a numerical model, simulate the impact of the population
growth and determine the ecosystem support capacity. For that, a mass balance through the
system modeling was carried out, focusing on the principal cause of eutrophication, the
nutrients (N and P) and de population density of the city. Sampling was made together with
the Consórcio Intermunicipal Lagos-São João. The nutrient budget was obtained through a
compartmented input/output model and the population projections were obtained through the
methodology utilized by IBGE. Simulations were performed for the years 2000, 2010, 2020,
2030, 2040 and 2050. In the first simulated scenario the considered effluent load of the city
corresponded to the permanent population and in the second one pertained to the permanent
population plus the floating population, that means the vacationers population. The
mathematical model utilized here was satisfactory and permitted the general analysis of the
system support capacity. The predictions showed that the permanent bar opening will not be
enough to solve the eutrophication problem if the nutrients loading to the system does not get
reduced, through land reclamation control or through the implementation of an efficient
treatment system or both of them.
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Document type
DissertaçãoFormat
application/pdf
Subject(s)
EutrofizaçãoLagoa
Saquarema(RJ)
Impacto antrópico
Laguna costeira
Eutrophication
Lagoon
Saquarema (RJ)
Coastal lagoon
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS