| Journal: | Revista brasileira de geofisica |
| Database: | PERIÓDICA |
| System number: | 000340010 |
| ISSN: | 0102-261X |
| Authors: | Batista, Edmilson das Merces1 Souza-Filho, Pedro Walfir Martins e1 Silveira, Odete Fatima Machado da1 |
| Institutions: | 1Universidade Federal do Para, Instituto de Geociencias, Belem, Para. Brasil |
| Year: | 2009 |
| Volumen: | 27 |
| Pages: | 83-96 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | The Cassipore and Orange mudcapes in the Northern of Brazil constitute a dynamic environment influenced by the Amazon river, where the shoreline changes are subjected to severe processes of progradation and erosion. Optical and microwaves remote sensed images were acquired from 1980 to 2003, and analyzed in a Geographic Information System (GIS), allowing the identification and quantification of prograding and retrograding areas along the shoreline. During this period, the largest erosion rates had occurred next to the Cassipor´e Cape, with mean retreat of 27.5 m of linear distance and erosion of 1.37 km2 of mangrove area per year. On the other hand, the largest rates of sediment deposition had occurred in the Orange Cape, where the coastal prograded 24.6 m per year, adding 55.86 km2 of mangrove area to shoreline in the last 23 years. The progradation mechanisms have determined an accretion in the mangrove vegetation of 50.8% throughout the last three decades. A sedimentary balance carried out in the study area showed that constructive processes (61.3%) are dominant over erosive processes (38.7%) |
| Portuguese abstract | Os cabos lamosos Cassipore e Orange no norte do Brasil constituem um ambiente dinamico influenciado pelo rio Amazonas, onde as modificacoes na linha de costa estao sujeitas a severos processos de progradacao e erosao. Imagens de sensores remotos opticos e microondas foram coletadas de 1980 a 2003 e analisadas em um Sistema de Informacao Geografica (SIG), permitindo a identificacao e quantificacao da distribuicao espacial das areas de progradacao e retrogradacao ao longo da linha de costa. Durante este perıodo, as maiores taxas de erosao ocorreram junto ao cabo Cassipore, com recuo medio de 27,5 metros de distancia linear e erosao de 1,37 km2 de area de manguezal por ano. Por outro lado, os maiores ındices de deposicao de sedimentos ocorreram no cabo Orange, onde a plan´ıcie costeira progradou 24,6 m ao ano, agregando 55,85 km2 de manguezal a linha de costa nos ultimos vinte e tres anos. Os mecanismos de progradacao determinaram um acrescimo na vegetacao de manguezal de 50,8% ao longo das tres ultimas decadas. Um balanco sedimentar realizado na area pesquisada demonstrou que predominam os processos construtivos (61,3%) sob os processos erosivos (38,7%) |
| Disciplines: | Geociencias, Biología |
| Keyword: | Geofísica, Ecología, Costas, Manglares, Vegetación, Erosión, Cabo Cassiporé, Amapá, Amazonas, Brasil |
| Keyword: | Earth sciences, Biology, Geophysics, Ecology, Coasts, Mangrove, Vegetation, Erosion, Cassipore Cape, Amapa, Amazon, Brazil |
| Full text: | Texto completo (Ver PDF) |
