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!