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Greener Dredging
IAPH mid-term conferenceJerusalem May 23 2012
René KolmanSecretary General IADC
Overview
• IADC, who are we.• Where we are coming from• The status of dredging
todaytoday• Where we are going: a
greener future
IADC, who we are
Dredging and perception • Zalul to Israel's Port Authority: "Dredging the
Haifa harbor and the Kishon River pollutes the sea with poisonous sludge and endangers public health!“ source:http://www.zalul.org.il/en/artical315.asp
• Volcani Center: “According to our knowledge, • Volcani Center: “According to our knowledge, the riverbed is not contaminated to the point of justifying the treatment planned by the Environmental Protection Ministry” Source:http://www.dredgingtoday.com/2012/03/28/israel-scientists-oppose-kishon-river-dredging/
Environmental Aspects of Dredging
Environmental Overflow Valve
‘Green valve’:
• Imperfect overflow
• Reduces air entrainment
• Reduces turbidity around vessel• Reduces turbidity around vessel
Dedicated equipment
Melbourne channel deepening project
Quarry tests
Specialisedripper draghead
Lab tests
minimise impacts
• Early contractor involvement• Predictive models• Building with Nature
Early contractor involvement
• Traditional
• Partnering
• Alliance
Tang et al., derived from Terra et Aqua 113, 2008
• Client: once in a life timeContractor daily business
• Involve contractor from a very early stage• Make use of the knowledge of the contractor
ECI advantages
• Share benefits• Reduce risk
Predictive models
enhanced Afsluitdijk?enhanced Afsluitdijk? Mississippi DeltaMississippi Delta
Building with Nature
Must we carry on like this?
Mississippi DeltaMississippi Delta
Happisburgh, UKHappisburgh, UKDeep Water Navigation ChannelYangtze Estuary, ChinaDeep Water Navigation ChannelYangtze Estuary, China
Building with Nature
PIANCWorking with naturevlaamsebaaien.com
Large-scale experiments (2010)3 reefs, 400 m3 oyster shells each
Example 1, oyster reefs
Example 2, sand engine Delfland
Dune formation Rare species
Aug 2011
Morphological changes
Recreation
Jan 2012
Zand-motor
Delfland
Convergence of perceptions
Dredging companies that care!
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