Appendix 5 - MAMPEC-BW 3.1 Information
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Statutory Documents - IMO Publications and Documents - Circulars - Ballast Water Management - BWM.2/Circular.13/Rev.4 – International Convention for the Control and Management of Ships' Ballast Water and Sediments, 2004 – (20 July 2017) - Annex – Revised Methodology for Information Gathering and Conduct of Work of the GESAMP-BWWG. Approved by MEPC 71 on 7 July 2017 - Appendix 5 - MAMPEC-BW 3.1 Information

Appendix 5 - MAMPEC-BW 3.1 Information

 1 GENERAL

1.1 The model Marine Antifoulant Model for PEC calculation for Ballast Water (MAMPEC-BW 3.1) or latest available version may be downloaded from the website of Deltares in the Netherlands. The website is:

https://download.deltares.nl/en/download/mampec/

1.2 Click on the link using also the <Crtl>-button. You will be directed to the download page of Deltares in the Netherlands. Deltares is an independent institution for applied research in the area of water and subsoil. For the ballast water application only portable versions are available. This means that the user is able to run the model without having "Administrator" rights on his computer.

1.3 At the Deltares website click on "Portable version MAMPEC 3.1.0.3 BW". Go to the right hand side of the screen and enter your name and e-mail address. You will receive a link to download a zip-file with the model.

1.4 Look in the directory where you downloaded the zip-file, click on the zip-file and unpack the programme. If you follow the default settings of the programme you will find the model with its executables in the directory specified in the set-up conversation. You may change the standard settings to your own choices.

1.5 Go to the specified directory and click on the executable "mampec.exe" and the main entrance screen will be shown.

2 CALCULATION OF THE PREDICTED ENVIRONMENTAL CONCENTRATION (PEC)

2.1 This calculation procedure is important for carrying out a risk assessment to the environment.

2.2 In order to provide a standard approach, it is recommended that the MAMPEC-BW 3.1.0.3 or latest available version is used to determine the PEC for each chemical identified.

2.3 When this model is used for calculation of the predicted concentration (PEC) in the harbour, several data have to be selected from the main menu of the programme. The entrance screen of MAMPEC-BW 3.1.0.3 looks as follows:

NOTE: in the upper right corner of the screen a user manual is always available.

2.4 To run the MAMPEC model three inputs are needed:

  • .1 the Environment (first item under "model" at the left hand side of the screen);

  • .2 the Compound (second item); and

  • .3 the Emission (third item).

2.5 Click on "Environment" and the following screen appears:

2.6 To load the GESAMP-BWWG Standard Harbour click on "Load" and the next screen appears:

2.7 In the "Description" box you may enter a name of the project, then click "GESAMP-BWWG Model Harbour" and successively on "Load". You will be taken back to the "Environment" screen but now the screen is loaded with the GESAMP-BWWG Model Harbour's specific data. It is recommended not to change the default values if the results will have to be used for a submission to IMO with respect to an approval in accordance with Procedure (G9).

2.8 To load the data for a compound click on "Compound", on which the "Compound" screen appears, as follows:

2.9 Click on "Load" and a list of all the GESAMP-BWWG compounds commonly associated with ballast water (41 compounds) will appear as follows:

2.10 For example, by clicking "Bromoform" and "Load" the data for bromoform can be shown in the "Compound" screen, like:

2.11 In the middle of the "Compound" screen biodegradation data may be shown for several of the 41 substances. It is advisable to start the calculation with all rate constants set to 0 (zero) as this is considered the worst-case situation. If the worst-case situation does not lead to the conclusion of potentially unacceptable effects, entering available degradation data with the accompanying calculation may solve the problem of exceeding a PEC/PNEC ratio of 1. This may be done by entering a rate constant or a half-life in the appropriate boxes.

2.12 In addition to the GESAMP-BWWG Harbour Environment shown above and the compound, the standard GESAMP-BWWG emission data need to be included as part of the GESAMP-BWWG Standard model in the same way as described already by clicking on "Emission" and successively on "Load". The following screens appear after each other:

and

2.13 By clicking on "Default Emission GESAMP Model Harbour" and on "Load" take you back to the emission screen, where you can complete your input by entering the concentration of the substance under consideration found in ballast water at the appropriate box. Successively clicking on "Calculate" gives the final emission in g/d. NOTE, that the concentration of the substance should be entered in mg/L (not μg/L).

2.14 All necessary input for MAMPEC has now been defined and the model can now be run by clicking on "Run model and view results". The following screen will appear:

2.15 In this screen some additional identifiers can be added, like a project name. A date will automatically be added (This box is grey and cannot be changed). It is not recommended to add information on background concentrations. Successively press "Run model" at the right hand side of the screen. The following screen appears:

2.16 The predicted concentrations at steady state in the harbour and the surroundings can now easily be identified.

2.17 At the left hand side some input/output facilities are given, like the generation of a report for publication.

2.18 The results of carrying out this procedure for each of the chemicals associated with the BWMS will be a series of PEC values, which should be included in a table with the Predicted No Effect Concentration (PNEC) and the appropriate assessment factor (AF). As a first assessment, the maximum value from the MAMPEC-BW 3.1.0.3 or latest available version calculations should be used. If this comparison results in PEC/PNEC ratios above 1, the 95%-ile may be used. If the PEC/PNEC ratio is still above 1, additional mitigation measures or a scientific reasoning may be proposed for discussion in the GESAMP-BWWG.

2.19 In addition to the mitigation measure mentioned in paragraph 2.11 above (taking into account the degradation of the substance), it can be useful to use the concentrations in the surroundings as a higher Tier evaluation.

2.20 The resulting table should be reported in the main document of the submission.

3 CALCULATION OF THE PEC IN THE VICINITY OF THE SHIP (PECNEAR SHIP)

3.1 The MAMPEC-BW, latest available version, will calculate the stationary concentration in the harbour after discharge of ballast water. To account for local effects, near the ship at discharge, the local concentration at near ship is estimated using the formulae suggested in Zipperle et al., 2011 (Zipperle, A., Gils J. van, Heise S., Hattum B. van, Guidance for a harmonized Emission Scenario Document (ESD) on Ballast Water discharge, 2011):

where

  • Cmax = the maximum concentration due to near ship exposure (μg/L) = PECnear ship
  • CBW = the concentration found in the discharged ballast water (μg/L)
  • S = dilution factor based on sensitivity analysis with a higher Tier model, default value = 5
  • Cmean = the mean concentration as output from MAMPEC-BW = called average in the MAMPEC results calculated.

3.2 The concentration calculated with this formula will be compared to acute toxicity data for the Active Substances and Relevant Chemicals to evaluate the short-term effects on aquatic organisms according to the ratio:

  • PECnear ship/ PNECnear ship.

Parent topic: Annex – Revised Methodology for Information Gathering and Conduct of Work of the GESAMP-BWWG. Approved by MEPC 71 on 7 July 2017
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