Reconhecimento geoacústico da margem equatorial brasileira: área delta do Rio Parnaíba (PI-MA)
This work was conducted in the brazilian equatorial margin: Parnaíba River Delta (PI-MA), between the Tutóia and Luís Correia cities. The main objective was the geoacoustic recognition of this region using side scan sonar and shallow seismic (chirp). Were acquired 49 sonographic lines and 87 seismic...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/34353 |
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| Resumo: | This work was conducted in the brazilian equatorial margin: Parnaíba River Delta (PI-MA), between the Tutóia and Luís Correia cities. The main objective was the geoacoustic recognition of this region using side scan sonar and shallow seismic (chirp). Were acquired 49 sonographic lines and 87 seismic lines, covering a total area of 24 km ², using small fisher boat. In the laboratory, the sonographic data processing included the use of filters in order to remove noises, that influenced directly in the low resolution and quality of the data. Shallow seismic processing was carried out following a flowchart formulated for the data under analysis, based on the information contained in the bibliography, and included the data, implementation of geometric corrections, spectral analysis, application of gains and filters, deconvolution and interpretation of seismic data. The results obtained from the processing and integration of acoustic data allowed the identification and sizing of different features present in the seabed, such as underwater dunes (width ranging from 7 to 15 m wide and heights between 0.10 to 1.2 m), channels (widths varying between 64 to 77 m), ripple marks, rocky outcrops and gas curtains. Therefore, this study intends to contribute to a better understanding of the evolution for a natural delta in response to climate change and sea level rise. |
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