Banca de QUALIFICAÇÃO: LÍVIAN RAFAELY DE SANTANA GOMES PINHEIRO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LÍVIAN RAFAELY DE SANTANA GOMES PINHEIRO
DATE: 23/02/2023
TIME: 08:30
LOCAL: Plataforma Google Meet (https://meet.google.com/ydy-rgia-npv)
TITLE:

ASSESSMENT OF CLIMATIC-DRIVEN COASTAL RISK ON URBAN BEACHES OF BRAZILIAN NORTHEAST

KEY WORDS:

Extreme Events; Coastal Disaster; Erosion; Flood; Generalized Pareto Distribution; SMC-Brasil; Average Wave Energy Flow.

PAGES: 112
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Coastal zones intense unplanned urbanization brings risk and environmental disasters through interaction between meteorological and oceanographic factors, in addition to human activities, which impact fragile populations and ecosystems. The coast of Rio Grande do Norte State (RN), Northeast Brazil, has been gone under successive flood and erosion events that cause damages to infrastructures, traditional populations and sensible ecosystems such as estuaries, mangroves and sandbanks. Study area is the Eastern Coast of RN, mainly the urban beaches Ponta Negra-Via Costeira, city of Natal, and Barra de Maxaranguape, city of Maxaranguape. This study aims to assess risk to erosion and sea overtopping flooding on beach structures.  It were obtained both observed and hindcasted wind, precipitation tide and wave time series, from meteorological gauges of the Brazilian National Institute of Meteorology, Agricultural Research Company of Rio Grande do Norte, AVISO satellite altimetry and global hindcasts (ERA5 and Wavewatch III), from 1979 to 2021. Generalized Pareto Distribution (GPD) fittings of wave significant high (Hs) and precipitation were performed. Registers of disasters along the coast of study area were collected from online local media. Offshore waves were propagated shoreward on Barra de Maxaranguape through SMC-Brasil model. On the Eastern RN continental shelf, waves have reached Hs maximum of 3.30 m, average of 0.76 m, coming from east-southeast and southeast. Winter and spring seasons have presented higher waves, related to action of trade winds. GPD estimated Hs increasing till 2.7 times over its average each 10 years. Increasing of wind speed is more important than its scalar value, to form an extreme wave. Hs at the virtual station had its upper peak either at the same day or one-two days before of coastal damage, which means that ocean storms offshore can propagate coastward quickly. On Barra de Maxaranguape, each 10 years, it is likely to happen a precipitation event of 138,71 mm at least once. Talus deposits laid in the beach face reduce incident wave energy. The Ponta Gorda headland receives the highest waves, hence these are the most energetic sea states. In the urbanized stretch of Barra de Maxaranguape beach, average wave energy flow reaches 2.08 x 104 J/ms with increasing trend since the 70’s. Next steps of this research are probabilistic analysis of flood level and risk mapping of the study area.

COMMITTEE MEMBERS:
Interno - ***.819.324-** - JULIO ALEJANDRO NAVONI - UFRN
Externa ao Programa - 1222082 - ADA CRISTINA SCUDELARI - UFRNExterno ao Programa - 350698 - VENERANDO EUSTAQUIO AMARO - UFRNExterno à Instituição - JOSICLÊDA DOMICIANO GALVÍNCIO - UFPE