Effects of stream channel morphology, transport processes and effective discharge on salmonid spawning habitats

Auteur(s) et Affiliation(s)

HAUER, C.

Christian Doppler Lab. for Advanced Methods in River Monitoring, Modeling and Engineering - Inst. for Water Management, Hydrology and Hydraulic Engineering, Dep. for Water-Atmosphere-Environment, BOKU - Univ. of Natural Resources and Life Sciences, Vienna, Autriche

UNFER, G.

Inst. of Hydrobiology and Aquatic Ecosystem Management, Dep. for Water-Atmosphere-Environment, BOKU - Univ. of Natural Resources and Life Sciences, Vienna, Autriche

TRITTHART, H.

HABERSACK, H.

Description :
The effects of stream channel morphology, transport processes and effective discharge on the salmonid spawning habitats of Thymallus thymallus and Salmo trutta ff. were investigated within the catchment of the Gr. Mühl River, Austria. Based on field survey, one-dimensional and two-dimensional hydraulic and sediment transport modelling, the abiotic characteristics of the spawning sites have been investigated. Application of the Meyer-Peter, Müller and Shields equations for determining critical discharge and critical shear stress revealed differences in the threshold of sediment motion due to the specific grain size sorting of the surface layer, which was dominated by cobbles and sand. The results show that the effective discharge for spawning habitats is a useful tool for spawning habitat restoration, representing the frequency of turnover and renewal of spawning habitats over the long term.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 5, p. 672-685, nombre de pages : 14, Références bibliographiques : 1,5 p.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais