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Previous issue date: 2010-02-25 / Estuaries are coastal environments ephemeral life in geological time, derived from
the drowning of the shoreline as a function of elevation relative sea level. Such parallel
systems is characterized by having two sources of sediment, the river and the sea. The
study area comprises the Acu River estuary, located on the northern coast of Rio Grande do
Norte State, in a region of intense economic activity, mainly focused on the exploration of
oil onshore and offshore, likely to accidental spills. In the oil sector are developed for salt
production, shrimp farming, agriculture, fisheries and tourism, which by interacting with
sensitive ecosystems, such as estuaries, may alter the natural conditions, thus making it an
area susceptible to contamination is essential in understanding the morphodynamic
variables that occur in this environment to obtain an environmental license. Information
about the submarine relief the estuaries are of great importance for the planning of the
activity of environmental monitoring, development and coastal systems, among others,
allowing an easy management of risk areas, and assist in the creation of thematic maps of
the main aspects of landscape. Morphodynamic studies were performed in this estuary in
different seasonal periods in 2009 to observe and quantify morphological changes that have
occurred and relate these to the hydrodynamic forcing from the river and its interaction
with the tides. Thus, efforts in this area is possible to know the bottom morphology through
records of good quality equipment acquired by high resolution geophysical (side-scan sonar
and profiler current by doppler effect). The combination of these data enabled the
identification of different forms of bed for the winter and summer that were framed in a
lower flow regime and later may have been destroyed or modified forms of generating fund
scheme than the number according Froude, with different characteristics due mainly to the
variation of the depth and type of sedimentary material they are made, and other
hydrodynamic parameters. Thus, these features background regions are printed in the
channel, sandy banks and muddy plains that border the entire area / Estu?rios s?o ambientes costeiros de vida ef?mera no tempo geol?gico, derivados
do afogamento da linha de costa em fun??o da eleva??o relativa do n?vel do mar. Tal
sistema par?lico se caracteriza por ter duas fontes de sedimentos, a fluvial e a marinha. A
?rea em estudo compreende o Estu?rio do rio A?u, localizado no litoral setentrional do
estado do Rio Grande do Norte, que se encontra em uma regi?o de intensa atividade
econ?mica, principalmente voltada ?s atividades de explora??o de petr?leo onshore e
offshore, pass?veis de derrames acidentais. Al?m da atividade petrol?fera s?o desenvolvidas
produ??o de sal marinho, carcinicultura, agricultura, pesca e turismo, que ao interagir com
ecossistemas sens?veis, como no caso dos estu?rios, podem modificar as condi??es naturais,
tornando assim uma ?rea suscept?vel a contamina??es sendo essencial o entendimento das
vari?veis morfodin?micas que ocorrem nesse ambiente para obten??o de licenciamento
ambiental. Informa??es a respeito do relevo submarino dos estu?rios s?o de grande
import?ncia para o planejamento da atividade de monitoramento ambiental, evolu??o e
din?mica costeira, entre outros, possibilitando num f?cil gerenciamento de ?reas de risco,
al?m de ajudar na cria??o de mapas tem?ticos dos principais aspectos da paisagem. Estudos
morfodin?micos foram realizados neste estu?rio em diferentes per?odos sazonais no ano de
2009 a fim de observar e quantificar as mudan?as morfol?gicas ocorridas e correlacion?-las
com as for?antes hidrodin?micas proveniente da a??o fluvial, bem como sua intera??o com
as mar?s. Desta forma, os trabalhos realizados nesta ?rea possibilitaram o conhecimento da
morfologia de fundo atrav?s de registros de boa qualidade adquiridos por equipamentos
geof?sicos de alta resolu??o (sonar de varredura lateral e perfilador de corrente por efeito
doppler). A jun??o destes dados possibilitou a identifica??o de diferentes tipos de formas
de leito para o per?odo de inverno e ver?o que antes eram enquadradas em um regime de
fluxo inferior e que posteriormente podem ter sido destru?das ou modificadas gerando
formas de fundo de regime superior segundo o n?mero de Froude, com caracter?sticas
diferenciadas devido principalmente ? varia??o da profundidade e ao tipo de material
sedimentar que s?o constitu?dos, al?m de outros par?metros hidrodin?micos. Desta forma,
estas fei??es de fundo est?o impressas em regi?es de canal, bancos arenosos e plan?cies
lamosas que margeiam toda ?rea
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/18811 |
| Date | 25 February 2010 |
| Creators | Rocha, Ana Karolina Rodrigues da |
| Contributors | CPF:31481981404, http://lattes.cnpq.br/3595069999049968, Amaro, Venerando Eust?quio, CPF:35385839191, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783253A6, Dominguez, Jos? Maria Landim, CPF:12127558553, http://lattes.cnpq.br/0345959348124698, Vital, Helenice |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Geodin?mica e Geof?sica, UFRN, BR, Geodin?mica; Geof?sica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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