Banca de QUALIFICAÇÃO: LUCAS BARBOSA CABRAL

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCAS BARBOSA CABRAL
DATE: 25/12/2025
TIME: 14:30
LOCAL: Sala 1 do PPGG
TITLE:

CHARACTERIZATION OF THE SUBMARINE MORPHOLOGY OF THE NORTHERN PORTION OF THE SÃO PEDRO AND SÃO PAULO ARCHIPELAGO

KEY WORDS:

Saint Peter and Saint Paul Archipelago; Multibeam Bathymetry; Geomorphology

PAGES: 60
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

Mapping the seabed plays a fundamental role in understanding, managing, and sustainably exploiting ocean ecosystems, constituting an essential tool in scientific, environmental, and economic applications. Among the most widely used techniques for this purpose, multibeam bathymetry stands out, allowing for the precise measurement of ocean depths and the generation of detailed three dimensional models of the submarine relief. This study was conducted in the South Atlantic, in the northern region of the São Pedro and São Paulo Archipelago, covering approximately 1,800 km². Bathymetric data were collected in 2023 during an expedition of the hydro-oceanographic vessel Vital de Oliveira (NpqHOc), of the Brazilian Navy, within the scope of the QWHALES Project. The acquisition was carried out with an EM-122 multibeam echo sounder (Kongsberg). Data processing was performed using HIPS and SIPS 12.0 software (Caris/Teledyne), complemented by the use of QGIS Desktop, version 3.40.5, and ArcScene, version 10.5, for the creation of thematic maps, elevation profiles, and three-dimensional representations. From the processing, bathymetry, slope, shaded relief maps, and five topographic profiles were generated. The bathymetric map, covering depths between 4,223 m and 152 m, allowed the identification of four main features: (i) the São Pedro e São Paulo Transform Fault; (ii) structures in the form of abyssal hills with a N–S orientation; (iii) abyssal basins and escarpments; and (iv) the São Pedro e São Paulo Peridotitic Chain, characterized by its elongated topographic elevation in an E– W direction. The slope analysis showed values ranging from 0° to 67°. Most of the study area exhibits gentle to moderate slopes (0°–16°), consistent with a relatively stable relief. The steepest slopes are concentrated near the peak of the peridotitic chain, at depths close to 150 m. The results obtained allowed for the characterization of the submarine morphology of the region and the establishment of correlations consistent with previous studies, contributing to the advancement of knowledge about the geomorphological dynamics of the São Pedro and São Paulo Archipelago

COMMITTEE MEMBERS:
Interno - 1451214 - ADERSON FARIAS DO NASCIMENTO
Presidente - 2218779 - HELENICE VITAL
Externo à Instituição - PATRICIA REIS ALENCAR OLIVEIRA - SGB