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Ecohydraulics of pool-type fishways for the Iberian Barbal (Luciobarbus Bocagei Steindachner, 1864)
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Orientador(es)
Resumo(s)
This study analyses the impact of different hydraulic conditions on the Iberian barbel’s
upstream movements in a pool-type fishway. Developed in an experiment pool-type fishway
prototype and including fish of different sizes, this study investigates: i) the efficiency of
passage through submerged orifices or notches; ii) the effect of velocity, turbulence and
Reynolds shear stress on this species’ behaviour; iii) the suitability of straight and offset
orifices to fish’s passage and, finally, iv) the efficiency of offset and straight orifices with a
deflector bar for this specimens’ movements. The fishways was found to be efficient to the
upstream passage of this species. Submerged orifices were preferentially used by specimens,
mainly by small fish which, although their higher rheotatic capacity, showed strong
difficulties to pass through the fishway. The behaviour of the latter was also the most affected
by turbulence and Reynolds shear stress, which seemed to be the variables affecting fish’
movements the most. Straight orifices were found not be adequate to fish passage, even when
added of a deflector bar. The results are discussed in terms of future research delineation.
Descrição
Doutoramento em Engenharia Florestal - Instituto Superior de Agronomia
Palavras-chave
Iberian barbel pool-type fishways migration Reynolds shear stress barbo Ibérico passagem para peixes tensões de Reynolds migração