Banca de DEFESA: CECÍLIA ALVES DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CECÍLIA ALVES DE OLIVEIRA
DATA : 26/03/2017
HORA: 14:00
LOCAL: Auditório
TÍTULO:

SPACE HETEROGENEITY OF SUBSTRATE PLATAFORM ADJACENT THE PONTA NEGRA, NATAL-RN

PALAVRAS-CHAVES:

COASTAL EROSION, SEDIMENTOLOGY, CONTINENTAL SHELF 

PÁGINAS: 107
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The morphology of coastal areas is constantly changing due to interaction of natural and anthropogenic processes. Sometimes the actions of these processes on the coastline can cause erosional problems, causing environmental impacts and socio-economic losses.In order to act preventively requires a thorough understanding of natural and anthropogenic factors that act in coastal dynamics. The aim of this study is the geological mapping of marine substrate adjacent the beaches of Ponta Negra and Barreira D'água, Natal,Brazil, in an area under intense coastal erosion. The methodology consisted of the collection of surface sediment samples of the continental shelf, analyzed for particle size, composition and presence of organic matter. Later integrated with pre-existing datasuch as geophysical (single and multbeam bathymetry, sonography) and hydrodynamic (waves, currents, tides) data. The results indicate that the grain size of the sediments that make up the substrate presented mainly coarse sand (43%), followed by medium sand(34%). The presence of carbonate is marked throughout the area, and increases with depth. The siliciclastic sediments are found near the shoreline, while bioclastic sediments occur predominantly after the isobath of 10m. Barreiras Formation outcrops on theshelf attests the sediment starvation, and indicates that this is the main cause of erosion in Ponta Negra beach, which can be amplified by human action. This information should be taken into account in the preparation of the recovery measures the area, whichis facing serious problems with erosion.

MEMBROS DA BANCA:
Presidente - 2218779 - HELENICE VITAL
Externo à Instituição - KARL STATTEGGER - CAU
Externo à Instituição - WERNER FARKATT TABOSA - UFRN
Externo ao Programa - 2177287 - ZULEIDE MARIA CARVALHO LIMA