Application Of The MSB Model To Ballast Water
Exchange In Tidal Embayments
Author(s)
S. Mecca, S. Morris & R. Barber
Abstract
For safety reasons, at a captain’s discretion, older vessels are often forced to
exchange ballast water while in port. This paper examines questions of the
optimal strategy for such ballast water exchange. The MSB (Mecca-Severino-
Barber) model for well-mixed tidal basins is applied to this marine operation,
parameterising the start of the ballast water release at different times in the tidal
cycle. This enables the identification of the optimal release time for a typical
single pump, single chamber vessel exchanging water in a hypothetical tidal
embayment. In practical applications, the optimisation procedure is somewhat
more complicated due to the fact that the problem can have multiple objectives:
minimising the maximum pollutant concentration as a result of the ballast water
exchange and/or minimising the relaxation time i.e. the time taken for the
pollutant concentration to reduce to an acceptable level. This necessitates the
application of multi-objective optimisation.
Keywords: tidal prism, pollution flushing, tidal embayment, ballast water
exchange, multi-objective optimisation.
1 Introduction
The MSB (Mecca-Severino-Barber) single embayment model [1] enables a
graphical and numerical representation of the process of pollution flushing from
a well-mixed tidal embayment temporally loaded with a known quantity of
pollutant. The model, which is written in Stella (Stella is a product of ISEE
Keywords
tidal prism, pollution flushing, tidal embayment, ballast water
exchange, multi-objective optimisation
Related Book
Other papers in this volume
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