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Información tecnológica

versão On-line ISSN 0718-0764

Resumo

MORALES, Alejandro I.  e  SOBENES, Catterina P.. Quality Evaluation of a Disturbed Urban River and Fish Pass Selection, Biobío Region, Chile. Inf. tecnol. [online]. 2018, vol.29, n.2, pp.155-164. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642018000200155.

In this study the quality of a section of the fluvial system known as Estero Nonguén located in the Biobío region in Chile was evaluated. This river was canalized for avoiding future floods and affecting surroundings towns. However, there have been no conducted evaluations on interventions to the river system to check and avoid damage to the natural movements of fish in the river. The presence of barriers in a section of the river was analyzed with quality and connectivity index. To propose a fish pass for a section of the river with an obstruction, the lineal ponderation method was used. The quality of the river was moderate with a deficient connectivity, blocking the movement of a group of fish over the obstruction. To reconnect the river, it is proposed the construction of a stone ramp, because of its low cost and simple flow, in compliance with the river environment.

Palavras-chave : urban river fragmentation; fish pass; conservation; migration; urban rivers.

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