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Turbidity Caused by Spillage from a Dredging/ Mining Transverse Axis Cutter

Citation

Sarkar, MK and Bose, N and Chai, S and Sarkar, S and Dowling, K, Turbidity Caused by Spillage from a Dredging/ Mining Transverse Axis Cutter, Proceedings of WODCON XX: The Art of Dredging, 3-7 June, Brussels, Belgium, pp. 1-10. (2013) [Refereed Conference Paper]


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Copyright Statement

Copyright 2013 Central Dredging Association (CEDA)

Official URL: http://toc.proceedings.com/21902webtoc.pdf

Abstract

Seabed mining introduces the potential for new mineral resources, but raises serious concerns about the environmental protection of our oceans. With potential developments located in more than 1500m of water, environmental consequences may be concealed, remote and problematic to monitor. All underwater dredging and seabed mining operations have consequent spillage from the cutter and suction configurations. The environmental impacts of this spillage can be severe, causing change and often degradation in habitat at a local and potentially regional scale. While spillage causes an increase in turbidity levels it can also release metals and other contaminants into the water column. Contaminants include ore, and gangue minerals as well as legacy deposits lying at the bottom of harbours that are mobilized during dredging. This paper reports on a spillage test, using turbidity as an indicator of contamination, in a specially designed tank with a transverse axis dredging/mining cutter, suction cowl and pump system. The paper reports the levels of increased turbidity relative to the cutter system and indicates the influence of the cowling design in reducing spillage levels. It discusses appropriate monitoring locations for optimal turbidity measurements. Experiments on spillage from new designs of seabed mining tools will enable modeling of mining best practice to minimize impact.

Item Details

Item Type:Refereed Conference Paper
Keywords:turbidity, dredging/mining spillage, transverse axis cutter, auger
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Environmentally Sustainable Mineral Resource Activities
Objective Field:Management of Solid Waste from Mineral Resource Activities
Author:Sarkar, MK (Dr Mridul Sarkar)
Author:Bose, N (Professor Neil Bose)
Author:Chai, S (Associate Professor Shuhong Chai)
ID Code:85357
Year Published:2013
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2013-07-02
Last Modified:2017-07-05
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