Volume 10, Issue 1 - March 2010
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Revista de Gestão Costeira Integrada
Volume 10, Número 1, Março 2010, Páginas 23-48
DOI: 10.5894/rgci153
*
Submissão – 24 Novembro 2008; Avaliação – 19 Abril 2009; Recepção da
versão revista – 22 Julho 2009; Disponibilização on-line - 11 Janeiro
2010
Concepção, Construção, Implantação e Monitorização de Recifes Artificiais de Betão com Incorporação de Lamas Orgânicas *
Development, Construction, Implantation and Monitorization of Concrete Artificial Reefs with Addiction of Organic Sludge
Jaime P. Dias Santos @, 1, 2, Mike Weber 2, 3, F. Veloso Gomes 1
@ - autor correspondente: jaimeprata@gmail.com
1 Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, vgomes@fe.up.pt;
2 Estação Litoral da Aguda - ELA, Rua Alfredo Dias, Praia da Aguda, 4410-475 Arcozelo-VNG ela.aguda@mail.telepac.pt
3 Instituto de Ciências Biomédicas Abel Salazar - ICBAS, Univ. do Porto, Largo Prof. Abel Salazar 2, 4099-003 Porto, mweber@icbas.up.pt
RESUMO
A utilização das tecnologias de habitates artificiais marinhos tem
ganho um crescente interesse mundial. Nos países desenvolvidos e em
vias de desenvolvimento existem razões para a sua aplicação na
resolução de problemas ambientais e económicos. Nas águas costeiras, de
praticamente todo o globo, foram implantados milhares de recifes
artificiais. Alguns destes recifes são navios e outras estruturas, de
grandes dimensões, fora de uso, que servem agora de habitat para os
organismos marinhos. Outros são estruturas concebidas propositadamente
como Recifes Artificiais com objectivos específicos. Num contexto de
desenvolvimento global das tecnologias ligadas aos habitates aquáticos,
o presente trabalho centrou-se no estudo do desempenho de módulos
recifais construídos em betão enriquecido com lamas orgânicas
provenientes de uma Estação de Tratamento de Águas Residuais (ETAR).
Foi estudada a taxa de colonização biológica e a diversidade de dois
recifes formados por módulos com uma composição diferente.
Foi efectuada uma revisão da literatura sobre a tecnologia dos Recifes
Artificiais e, com base nesse conhecimento, foram desenvolvidos módulos
recifais em betão, com forma cúbica, com os quais se construíram dois
pequenos recifes que foram implantados na zona sublitoral da praia da
Aguda, no norte de Portugal.
O uso de lamas orgânicas na composição do betão é um contributo
inovador deste trabalho. O objectivo foi comparar o desempenho do
recife construído com módulos de betão simples com o recife construído
com betão enriquecido com lamas no que respeita à colonização, pelas
macroalgas e pelos organismos macrobênticos. A colonização, por parte
da fauna e flora, e a sucessão biológica foram monitorizadas ao longo
de quatro meses.
Os dados recolhidos permitiram compreender a forma como as comunidades
faunística e florística reagiram perante a presença destes Recifes
Artificiais, de que forma ocuparam este substrato virgem e as
diferenças, na abundância e na diversidade, existentes entre os dois
tipos de recife.
Foram calculados as percentagens de cobertura biológica e quatro
índices ecológicos: Número de espécies (S), Equitabilidade de Pielou
(J’), Diversidade de Shannon (H’) e Diversidade de Simpson. A análise
dos dados foi efectuada através de técnicas multivariadas
não-paramétricas usando o programa PRIMER. Foi utilizada a ordenação
multidimensional não-métrica (nMDS) para produzir diagramas de
ordenação bi-dimensionais. A análise de similaridade “One-way ANOSIM”
foi usada para testar a hipótese nula da não existência de diferenças
significativas entre os dois recifes para a cobertura biológica e para
a diversidade.
Os resultados obtidos indicam que quer a taxa de cobertura biológica
quer a biodiversidade foram significativamente maiores no recife
construído com os módulos de betão no qual se incorporaram lamas de
depuração de esgoto doméstico do que no recife construído com módulos
de betão simples. Os módulos de betão com lamas desenvolveram um
biofilme mais espesso, num espaço de tempo mais curto, e também
apresentaram um crescimento maior das macroalgas e uma maior
diversidade e abundância por parte das espécies animais colonizadoras.
A adição, ao betão, de substâncias capazes de libertar nutrientes
localmente, parece ser uma boa opção no sentido de se obter uma
colonização biológica eficiente e uma rápida naturalização dos Recifes
Artificiais em betão.
Palavras-chave: Recifes artificiais, betão com lamas, monitorização.
ABSTRACT
The use of artificial habitat technologies is gaining increasing global
interest. Opportunities exist in both developed and developing
countries to apply these technologies to environmental and economic
problems. Beneath the coastal waters of the world lie thousands of
artificial reefs. Retired ships and other disposal materials now serve
as habitats for marine life, and newer reefs that have been designed
and built for specific applications.
With the field of aquatic habitat technology continually growing, the
present study focuses on the composition of reef units using cement in
conjunction with organic sludge from urban waste water treatment
plants. This research includes the monitoring of the biological
colonization rate and diversity of two different types of reef units.
Worldwide use of artificial reef technology was reviewed and, on this
base, cubic concrete modules were developed and constructed to build
two experimental artificial reefs that were placed in the sublitoral
zone of the beach of Aguda in North Portugal. The use of organic sludge
in concrete composition is a new contribution of this research. The aim
was to compare different concrete compositions and the performance of
colonization by macroalgae and macrobenthic organisms between the
modules built with and without sludge. The colonization by fauna and
flora and the biological succession of the two artificial reefs were
monitored over four months. The data allowed understanding how the
floristic and faunal communities reacted in the presence of these
artificial reefs, how they occupied this virgin substrate and how
abundance and biodiversity differed between the two different types of
reefs. The percentage of biological coverage and four biological
indices were calculated: Number of Species (S), Pielou’s Evenness (J’),
Shannon’s Diversity (H’) and Simpson’s Diversity. Data analysis was
performed with non-parametric multivariate techniques using the PRIMER
software. Non-metric multidimensional scaling (nMDS) was used to
produce two-dimensional ordination plots. One-way ANOSIM was used to
test the null hypothesis of no significant differences, between the
reefs, for biological coverage and diversity.
The results suggested that either the biodiversity or the percentage
biological coverage were significantly greater at the reef constructed
with concrete and domestic sludge than at the reef constructed without
the sludge. The concrete modules containing sludge developed a thicker
biofilm layer on its surface in a shorter time. They also revealed a
more intensive and faster growth of macroalgae and a greater diversity
and abundance of colonizing organisms.
The addiction to the concrete of substances that can release nutrients
locally seems to be a good option in order to obtain an efficient
colonization and a rapid naturalization of concrete Artificial Reefs.
Keywords: Artificial reefs, concrete modules with sludge, monitoring.
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Sítios da Internet:
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