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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : The burst-coast swimming of schizothorax prenanti and hydraulics in vertical
The burst-coast swimming of schizothorax prenanti and hydraulics in vertical
Author : AN RUIDONG(1), LIJIA(2)
ABSTRACT
This paper describes a novel experiment testing the correlation between hydraulics and biological behavior in passing
vertical slot fishways of Schizothorax Prenanti, a rare species fish in southwest China. According to the swimming ability
test and behavior analysis of Schizothorax prenanti, they usually adopt the burst-coast mode for continued swimming in
long distance fishway for saving energy. To obtain quantitative information about the correlation of velocity pattern£¬
energy dissipation efficiency and migratory path in the pool, experiments were conducted in a physical model with
equidimension to a section of fishway in Shaping ¢òpower station, Dadu River. With acoustic Doppler velocimeter and
video camera, hydraulic parameters including water head drop, velocity patterns and flow rate, the biological behavior
including burst-coast, sustained swimming and migratory path were analysed under test conditions. A novel structure of
L Shape baffle was introduced creating more energy dissipation efficient and sustained fish-friendly velocity distribution.
In accordance with conservation of energy, the head drop for the elevation difference between the upstream and
downstream of the pool is 0.08~0.11m. Fish move along the jet flow almost to the side of the pool by frequently wagging
tail from the maximum velocity area, then slide along the convergence are of the mainstream without crossing until the
long Baffle and make the turn rapidly. For the main stream of the pool, the ¡®¦¸¡¯ shape flow pattern behaves more fishfriendy,
which can effectively extend the energy dissipation distance and avoiding bursting through high velocity zone.
The above findings were used as the basis to evaluate the hydraulic performance of the fishways, which the L shape
baffle structure are expected to be effective on creating preferences flow for fish.
File Size : 1,184,344 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 18/08/2015
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