Alterações morfológicas da Foz da Laguna de Guaraíras, RN/Brasil
In the south coast of state of Rio Grande do Norte, northeast of Brazil, is situated the Guaraíras Lagoon. This lagoon has shown significant changes in its morphodynamic and hydrodynamic behavior in the last decades. Factors such as changes in superficial runoff, silting and erosion of embankment...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/37065 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | In the south coast of state of Rio Grande do Norte, northeast of Brazil, is situated the
Guaraíras Lagoon. This lagoon has shown significant changes in its morphodynamic and
hydrodynamic behavior in the last decades. Factors such as changes in superficial runoff,
silting and erosion of embankment margins are already evident and compromise whole
functioning system. Added to thesefactors, there is a strong presence of shrimp farming in the
area around the lagoon, representing 9% of national production, thus generating great
relevance for the local and regional economy. In this context, the present study aims to
analyze the morphodynamic behavior of the mouth of the Guaraíras Lagoon, based on the
application of geoprocessing techniques to quantify the rate of erosion and deposition of the
study area. For the methodological procedures the work counted on the multitemporal
analysis of variations of beach line, using satellite images of the LANDSAT series, between
1984 and 2018, and the application of geostatistical analyzes (End Point Rate - EPR, Linear
Regression Rate - LRR e Net Shoreline Movement - NSM) for quantification of the
erosion/deposition rate of the changes that occurred during this period of analysis (1984 -
2018). Based on the results obtained by the EPR, an intense erosion rate of 6.4 m/year and
0.34 m/year of deposition of the left embankment margins of Guaraíras Lagoon occurred. The
margin to the right of the embouchure presented a variation of 1 m/year of erosion and a rate
of 1.34 m/year of deposition. In the beach strip south of the embouchure there was 1.5 m/year
of erosion and 1 m/year of deposition and in the northern portion of the mouth a rate of 3
m/year of erosion with 1.57 m/year of deposition. Considering the results obtained, there was
a morphological instability at the mouth of the Guaraíras Lagoon, with a strong erosive
tendency in the left margin, resulting a decrease of -217.82 m in relation to 11.67 m of
deposition; and on the right bank the trend was depositional, corresponding to 45.6 m increase
in relation to -31 m of erosion. Thus, through the geoprocessing techniques applied, it was
possible to quantify the rate of erosion/deposition at the mouth of the Guaraíras Lagoon
during the period studied (1984 - 2018). |
|---|