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(Article of periodic en Anglais - 2014)

Document title

Modeling the effects of pulsed versus chronic sand inputs on salmonid spawning habitat in a low-gradient gravel-bed river

Authors(s) and Affiliation(s)

MATURANA O. (1) ; TONINA D. (2) ; MCKEAN J.A. (3) ; BUFFINGTON J.M. (3) ; LUCE C.H. (3) ; CAAMAÑO D. (4) ;
(1) Dept. de Ingeniería Civil, Univ., Concepción, CHILI
(2) Center for Ecohydraulics Research, Univ. of Idaho, Boise, ETATS-UNIS
(3) US Forest Service, Rocky Mountain Research Station, Boise, ETATS-UNIS
(4) Dept. de Ingeniería Civil, Univ. Católica de la Santísima Concepción, Concepción, CHILI

Abstract

The AA. hypothesize that a continuous (i.e. chronic) supply of sand will be more detrimental to the quality of aquatic habitat than an instantaneous sand pulse equal to the integrated volume of the chronic supply. They investigate this issue by applying a two-dimensional numerical model to a 1 km long reach of prime salmonid spawning habitat in central Idaho. Results show that in both supply scenarios, sand moves through the study reach as bed load, and that both the movement and depth of sand on the streambed mirrors the hydrograph of this snowmelt-dominated river. Predictions indicate greater and more persistent mortality of salmonid embryos under chronic supplies than pulse inputs, supporting this hypothesis. However, predicted mortality varies both with salmonid species and location of spawning. The AA. found that the greatest impacts occur closer to the location of the sand input under both supply scenarios. Results also suggest that reach-scale morphology may modulate the impact of sand loads

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no7 [pp. 877-889]

Bibliographic references : 2 p.

Collation : 11 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3491

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28681957 : Permanent link - XML version
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