Este artigo apresenta a classificação morfodinâmica das praias do município de Ipojuca, sul de Pernambuco, através da análise semântica de imagens de satélite disponibilizadas pelo Google Earth. Foram analisadas 61 imagens, nas quais foram observadas feições indicadoras de estágios morfodinâmicos segundo modelos propostos para praias dominadas por ondas, pela maré, modificadas pela maré e controladas pela geomorfologia. A partir das imagens estudadas foi possível constatar a presença/ausência de feições tridimensionais, além de identificar agentes geomorfológicos controladores da hidrodinâmica costeira. Tais observações abrangeram a zona de surfe, a praia e a pós-praia. Apesar da pequena extensão (< 30km), o litoral em questão apresenta uma grande diversidade de ambientes praiais, o que reflete na ocorrência de distintos estágios morfodinâmicos e na dominância das várias forçantes como agentes modeladores das praias arenosas analisadas.
Mallmann, D.L.B. and Pereira, P.S., 2014. Coastal erosion at Maria Farinha Beach, Pernambuco, Brazil: Possible causes and alternatives for shoreline protection.The aim of this study is to understand the main processes that are involved in the erosion of Maria Farinha Beach, in Recife, Brazil, a beach of great ecological and socioeconomic importance. Currently, the southern part of the beach is exposed to more frequent periods of erosion, especially during spring tides, while in the northern part accretion can be observed. The possible causes of erosion can be related to: (i) changes in longshore drift rates, resulting in a negative sediment budget; (ii) the impact of the incoming waves, that concentrate energy in a small sector, and/or (iii) urban development on top of the beach system. In order to minimize erosion problems, the following alternatives are suggested: (i) the construction of a submerged breakwater; (ii) the use of a sand bypassing system and (iii) the relocation of existing buildings. It is concluded that the erosion problem at Maria Farinha is complex and difficult to solve, since it has multiple causes.
ADDITIONAL INDEX WORDS:Beach management, wave modeling, coastal processes.
Quaternary and Environmental Geosciences (2014) 05(2):137-154Papel da praia na proteção da costa e as alterações oceanográficas em diferentes escalas temporais Caracterização do litoral central de Pernambuco (Brasil) quanto ao processo erosivo em curto e médio-termo
AbstractThis article aims for a better understanding of the ongoing erosion along the central coast of Recife Metropolitan Area in terms of the process and of spatial and temporal scales involved. For that, coastal variations of short and medium-term were analyzed, previous studies were reviewed, erosion indicators were surveyed and an inventory of damage records caused by erosion and reported in major newspapers in circulation in the state was conducted. The results showed that the process does not behave homogeneously along the coast, which present areas of intense erosion and other areas where the process does not occur or is incipient. Nor under the temporal point of view the area is homogeneous, presenting segments with distinct behaviors of shoreline in the different time scales considered. Moreover, we observed significant anthropogenic component acting on the reduction of the backshore width in certain segments, represented by the advance of the occupation on sectors of the beach system. The results of the study show us the necessity to consider spatial and temporal variability of the studied beaches before any intervention and demonstrated the importance of developing programs or actions of coastal management that prioritize the maintenance/restoration of the beach system, one of the main current environmental demands in the region.
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