Processo erosivo e defesas costeiras das praias de Ponta Negra e Via Costeira, Natal/RN: uma análise estrutural e ambiental
Coastal agents such as waves, nearshore currents, winds and tides are capable of transporting sediments from one place to another, to generate a positive or negative sediment balance in coastal areas. Ponta Negra beach and part of Via Costeira in Natal/RN suffer erosion and their sediment supply...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/54517 |
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| Resumo: | Coastal agents such as waves, nearshore currents, winds and tides are capable of
transporting sediments from one place to another, to generate a positive or negative
sediment balance in coastal areas. Ponta Negra beach and part of Via Costeira in
Natal/RN suffer erosion and their sediment supply is compromised due to disorderly
urbanization from the 1990s onwards. Several problems were installed on the beach
caused by the energy of the waves, which no longer had space to dissipate, since
urbanization advanced on the beaches and solidified an environment that was still part
of a dynamic process. As it is one of the biggest tourist places in the city of Natal, the
region attracted the government's attention to the elaboration of a beach recovery plan
with the implementation of new coastal defense works: sediments replacement,
containment structure and adequacy of the rainwater drainage system that flows into
the beach face. This work analyzes the coastal erosion status and evaluates the coastal
defense works implemented and in planning at Ponta Negra beach and Via Costeira.
Making use of satellite images, LANDSAT and Sentinel-2, and geoprocessing tools
such as CASSIE and QGIS, it was possible to perform the automatic extraction of
shorelines and verify the sedimentary balance in area in the long (last 30 years) and
medium term (last 06 years) area. The study also analyzes the pathologies of the
coastal protection works installed since 2012 and the weaknesses that they will cause
to the process of fattening the beach. With geoprocessing, it is noted that Ponta Negra
Beach faces continuous erosion, as well as the southern portion of Via Costeira Beach.
About beach recovery projects, there is a lack of integration and harmony between
them, which favors the emergence of flaws in the definition of relevant points for the
proper functioning of the recovery work. |
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