Banca de DEFESA: DÉBORA JOYCE DO NASCIMENTO ROCHA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DÉBORA JOYCE DO NASCIMENTO ROCHA
DATE: 03/12/2025
TIME: 14:00
LOCAL: Videoconferência
TITLE:

Satellite-Derived Bathymetry Applied to the Caiçara do Norte Platform Region, Rio Grande do Norte, Brazil

KEY WORDS:

Shallow water mapping; Multispectral imagery; Band ratio; Subaqueous morphology; Derived bathymetry

PAGES: 66
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geologia
SPECIALTY: Sedimentologia
SUMMARY:

The continental shelf in northern Rio Grande do Norte is extremely shallow, with water depths of up to 75 m, making detailed bathymetric surveys challenging. This study utilized Satellite-Derived Bathymetry to aid in mapping shallow environments. The objective of the research is to estimate bathymetry and morphologically characterize the region of Coroa das Lavadeiras, located north of the municipality of Caiçara do Norte (RN). The proposed methodology was based on the use of multispectral images from the Landsat-8 and Sentinel-2A sensors, combined with in situ depth data. After applying atmospheric correction, empirical methods based on band ratios and polynomial regression models were used to estimate water depth. The performance of the models was evaluated using statistical metrics such as R², RMSE, MAE, and MARD. The results indicated that the model developed using Landsat-8 data, within the depth range of -2 to -30 meters and using the combination of blue and green bands (B1/B2), yielded the best performance, with an R² of 0.71 and the lowest error values. The final application of the model enabled the generation of a representative bathymetric map, bathymetric profiles, and 3D models for the identification of underwater morphological features, such as the “Coroa das Lavadeiras,” longitudinal dunes, and transverse dunes, highlighting the potential of the adopted approach for mapping and analyzing shallow coastal areas.

COMMITTEE MEMBERS:
Externa ao Programa - 1226434 - MARY LUCIA DA SILVA NOGUEIRA - nullPresidente - 2042405 - MOAB PRAXEDES GOMES
Externo à Instituição - PEDRO XAVIER NETO
Externo à Instituição - THIAGO DA SILVA MARINHO