IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Hydraulic analysis of resting pool preferences for arctic grayling (thymallus arcticus) in a nature-...
Hydraulic analysis of resting pool preferences for arctic grayling (thymallus arcticus) in a nature-like fishway: a case study in the northern canadian barrenlands
This study evaluated a habitat compensation project on a lake-outlet stream in the Canadian Barrenlands. West Island
Stream (WIS) was modified through the construction of nature-like fishway structures to increase habitat connectivity
and allow fish access to productive habitat. The ecohydraulics of five pools were evaluated for resting habitat suitability
for arctic grayling (Thymallus arcticus). An acoustic doppler velocimeter was used to measure point velocities within
each pool on a 0.1 m x 0.1 m grid under flow conditions of 1.0, 9.9 and 21.9 l/s. Arctic grayling were placed in WIS
under each flow condition and their resting behaviour was observed. Results showed that fish preferred deep pools with
large surface areas. Based on the findings of this studies, it is recommended that resting pools be designed to provide a
minimum depth of 0.6 m, a minimum surface area of 1.4 m2 (1.4 m length x 1.0 m width) and horizontal velocities less
than 0.2 m/s under all flow conditions expected during spawning periods.
File Size : 591,301 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 13/08/2015
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