wageningen imares is een samenwerkingsverband tussen wageningen ur en tno application of dispersants...
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Wageningen IMARES is een samenwerkingsverband tussen Wageningen UR en TNO
Application of dispersants on
oil spills in the North SeaWorkshop: The Hague, October 2, 2007
Workshop program
10.0010.00 Word of welcome by ir. L. Bijlsma (director Waterdienst)
10.1510.15 Opening and introduction
10.3010.30 Lectures
14.0014.00 Subgroup discussions
15.4515.45 Plenary presentation
16.3016.30 Evaluation and closure
Announcements
Word of welcome
ir. L. Bijlsma (director Waterdienst)
Wageningen IMARES is een samenwerkingsverband tussen Wageningen UR en TNO
Application of dispersants on oil spills in the North Sea
Introduction
Workshop objective
Learn… from other countries Discuss… about application in NL Recommend… on a Dutch decision
tree
…to arrive at a Decision Tree for the use of dispersants on the Dutch Continental Shelf
Capaciteitsnota 2006-2010
Objective How prepared is RWS for combating oil spills Which and where updating is required
Background Goals defined in ‘Nota bestrijding milieugevaarlijke stoffen
Noordzee 2000-2010’ Capacity is determined by protection of vulnerable areas National and international experience (e.g. Erika,
Prestige)
New in the Capaciteitsnota: Use of chemical dispersants
Torrey Canyon 1967Torrey Canyon 1967• 14.000 tonnes oil reached shoreline• 10.000 tonnes industrial dispersants
Considerations for selection of strategy
Analysis of the threat Assessment of (meteorological) conditions Evaluation of regional vulnerability
Use of dispersants
Basic strategy is mechanical combatement Deployement of UK Maritime and Coastguard
Agency, according to Bonn Agreement Coverage of DCS within 8 hours
To Spray or not To Spray?
When is use of dispersants considered possible? acceptable? feasible?
Decision tree
Decision trees: To Spray or not To Spray?
Source: CEDRE 2005
Decision trees: To Spray or not To Spray?
Source: TNO 2004
Decision trees: To Spray or not To Spray?
Source: TNO 2004
Decision trees: To Spray or not To Spray?
Source: Lewis, 2007
WILL DISPERSANTS WORK?
1. Should dispersants be used on the type of spilled oil?
YES
NO
2. Is the spilled oil of a type that is dispersible?
YES
NO
3. Is the oil likely to be within the time “window of opportunity’ for dispersant use?
YES
NO
4. Are the sea conditions suitable for dispersion?
YES NO
DO NOT USE
DISPERSANTS
USE DISPERSANTS
Workshop objective
1. Learn…2. Discuss…3. Formulate recommendations…
…to arrive at a Decision Tree for the use of dispersants on the DCS
1.1. Learn
What are dispersants (Lewis)
Which response options are in use (Huisman)
Strategic/operational aspects of aircraft application (Frances)
Vulnerability of the North Sea (v Dalfsen)
2.2. Discuss
Approval of dispersants
Bird vs fish debate
Dealing with operational restrictions
Monitoring of (short- and longterm) effects
3.3. Formulate recommendations
formulate suggestions and recommendationsto be used when developing a Decision Tree for use on the Dutch Continental Shelf
Workshop program - Lectures
10.3010.30 Different aspects of oil spill dispersantsAlun Lewis, Oil Spill Consultant
11.1511.15 Current practice in response methods in the BonnAgreement Sjon Huisman, Rijkswaterstaat
11.4511.45 Strategic & operational aspects of the application byaircraftChris Frances, Maritime Coastguard Agency UK
12.30 – 13.30 Lunch12.30 – 13.30 Lunch
13.3013.30 Ecological sensitivity in the Dutch part of the North Sea
Jan van Dalfsen, IMARES
Workshop program – Subgroup sessions14.0014.00 Subgroup workSubgroup work
Each divides 5 points (stickers) over subgroup questions Discussion start with highest rated question Each provides 1 recommendation on Post-It note Each is invited to answer other questions after the workshop!
SessionsSessions1. Which criteria are important for the approval of specific dispersant
products2. How can different types of ecological impact of (un/)dispersed oil be
compared3. How can we deal with the operational restrictions in using dispersants4. How should short and long term effects of dispersed oil be monitored
15.15 15.15 Break and demo’sBreak and demo’s
15.4515.45 Presentation of subgroup results16.3016.30 Evaluation and closing words