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TitreThe restoration of beaches contaminated by oil in Chedabucto Bay, Nova Scotia
AuteurOwens, E H
SourceEnergy, Mines and Resources Canada, Marine Sciences Branch, Manuscript Report Series 19, 1971, 83 pages (Accès ouvert)
LiensOnline - En ligne
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
SNRC11F/06; 11F/07; 11F/10; 11F/11
Lat/Long OENS-61.5000 -60.5000 45.7500 45.2500
Sujetsmilieu côtièr; études côtières; gestion côtière; littoraux; pollution par le pétrole; substances polluantes; contrôle de la pollution; paléoécologie; distribution des sédiments; milieux sédimentaires; sedimentation; restauration; géologie marine; géologie de l'environnement
Illustrationslocation maps; profiles; photographs; tables
Diffusé1971 01 01
Résumé(disponible en anglais seulement)
Following the wreck of the "Arrow" in Chedabucto Bay, Nova Scotia, more than 150 miles of shoreline were polluted with Bunker C oil and a beach restoration programme was established which involved 30 miles of coastline. The beaches of this region vary from low-energy marsh environments to complex shingle spit systems, as well as many areas of eroding rock and till deposits. Only a few miles of beach are made up of sand-size material.
The contaminated sand beaches were cleaned relatively easily but although various manual and mechanical methods were implemented, no effective or efficient method of removing oil from shingle beaches was found. Oil on active shingle beaches was often buried up to a depth of 5 feet with clean and contaminated sediments having been thoroughly mixed by wave action. The amount of oil in these sediments was as low as 10 ppm and restoration of this type of shore involved the removal of large volumes of beach material. Where oil remained as a surface layer on the beach, a front-end loader proved to be effective in removing the contaminated layer.
In active beach environments normal wave processes will clean the beaches naturally unless there is so much oil or wave energy is so low, that the movement of sediments is prevented. On these paralysed beaches some attempt should be made to break up the surface so that wave action is able to rework and clean the beach sediments.