Radargrama
A detecção de fontes emissoras de poluentes para linhas de água, é uma tarefa particularmente exigente em ambiente urbano. A profusão de trajectos potenciais desde o foco de poluição até ao ponto de entrada na linha de água é um sério viés que dificulta imenso essa tarefa.
A primeira questão que se coloca é bastante fácil de intuir e reside na falta de cadastro de redes de águas pluviais. Essa falta de cadastro torna quase impossível a detecção de ligações indevidas de saneamento à rede de águas pluviais, por métodos clássicos. Relembre-se que as águas pluviais desaguam, frequentemente, em linhas de água. As consequências ambientais do que se acabou de descreveu são óbvias e graves.
A utilização de ferramentas como o Georadar são um precioso auxílio na detecção de redes subterrâneas (tais como as redes de água pluvial), contribuindo para o mapeamento e detecção de focos de poluição.
Localização do projecto
Os resultados de um teste-piloto realizado numa pequena área da bacia do Este, em Braga, permitiram verificar a aplicabilidade desta ferramenta no mapeamento de focos de poluição, suportada por posterior tratamento em ambiente SIG. Existem também projectos de maior envergadura, como o projecto Mapping the Underworld, em que se pode ver a aplicabilidade deste tipo de ferramentas, com ainda maior amplitude.
Rio Este, Braga
Saudações geofísicas
Bruno Sameiro Pereira | Geólogo e co-fundador da Sinergeo
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