Authors: Shugar, Daniel; Kostaschuk, Ray; Ashmore, Peter; Desloges, Joe; Burge, Leif

Source: Canadian Journal of Civil Engineering, Volume 34, Number 9, September 2007 , pp. 1192-1195(4)

Publisher: NRC Research Press

Abstract:

Fletcher's Creek is located in an urbanizing basin near Toronto and has a bed and banks composed primarily of cohesive Halton Till. Critical shear stress and an erodibility coefficient for the till were determined using an in situ jet-tester that directs a submerged jet of water perpendicular to the sediment surface. The results from 10 jet-tests indicate that the till has a relatively low critical shear stress and relatively high erodibility coefficient and could be susceptible to bed scour during flood events. Many other streams in southern Ontario have urbanizing watersheds with cohesive till beds that may also be susceptible to erosion.Key words: critical stress, submerged jet, erodibility, cohesive soils.

Le ruisseau Fletcher est situé dans un bassin en voie d'urbanisation près de Toronto; son lit et ses berges sont principalement composés de till cohérent Halton. Les contraintes critiques de cisaillement et un coefficient d'érodabilité du till ont été déterminés en utilisant une lance in situ qui dirige un jet d'eau submergé perpendiculairement à la surface des sédiments. Les résultats provenant de dix essais avec la lance indiquent que le till possède une résistance au cisaillement critique relativement faible et un coefficient d'érodabilité relativement élevée et qu'il pourrait subir de l'affouillement du lit durant les crues. Plusieurs autres ruisseaux du sud de l'Ontario présentent des bassins en voie d'urbanisation comportant des lits de till cohérent qui pourraient aussi être susceptibles à l'érosion.Mots-clés : contrainte critique, lance submergée, érodabilité, sols cohérents.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2007-09-01

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• Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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