terça-feira, dezembro 29, 2009

Cheias em ribeiras podem ser prevenidas

As enxurradas e cheias nas ribeiras podem ser prevenidas. A posição é do especialista em hidrologia da Universidade dos Açores, José Carlos Fontes. O hidrologista avança já ter pedido por várias vezes apoios ao Governo Regional para montar estações que dão indicação da erosão do solo e escoamento superficial junto às linhas de água mais críticas, mas sem sucesso.“Estas estações, que chamo de agro- meteorológicas, porque nos dão indicações de clima e solo, não permitem prever propriamente as enxurradas mas podem ser determinantes para preveni-las. Colocadas a montante darão um sinal em tempo útil de que determinada zona se encontrará potencialmente em perigo”, afirma.José Carlos Fontes afirma ter já quatro estações desta natureza colocadas na Terceira, quatro para estudar situações que se prendem com a produção frutícola e três para o estudo da erosão do solo e escoamento superficial. “Pedi há algum tempo um subsídio para colocar outra na zona dos Regatos, em São Bartolomeu, para fazer um balanço hidrológico em zona de floresta, mas não foi atribuído até ao momento”.
Questão de limpezaMas José Carlos Fontes defende que mais importante do que prever enxurradas é evitá-las respeitando a natureza e mantendo as ribeiras limpas. De acordo com o investigador da Universidade dos Açores existem várias zonas em risco na Terceira, nomeadamente a Ribeirinha e a Ribeira do Texto, na freguesia do Porto Judeu.“As pessoas estão a tomar conta da secção da ribeira, fazendo a construção de canis, por exemplo”, avisa. Por outro lado, a limpeza é determinante, porque o facto de as ribeiras não estarem limpas cria atrito e diminui a velocidade a que a água corre. “Isso acaba por provocar um maior aumento do nível da água e as cheias”explica. São de evitar também “as pontes, improvisadas”, porque podem ficar detritos bloqueados que obstruem o leito.O especialista identifica vários factores de risco. “Podem surgir problemas quando se fazem alterações do coberto florestal, fazendo a mudança da floresta para pastagens, quando se impermeabilizam solos para fazer passar auto-estradas. Tudo isso muda o ciclo hidrológico e conduz a diferentes infiltrações”, revela.

(In Diário Insular)

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