Abstract


AGENT BASED MODELLING AS A TOOL TO MANAGE DREDGING IMAPCT ON CORAL SPAWNING

Turbidity and sedimentation generated by dredging and dredge material disposal can seriously affect coral reproduction during spawning periods. Numerical modelling can be used as a powerful tool to predict and manage the risk of impacts. Dredge plume modelling predicts the plume dispersion and associated turbidity and sedimentation rates, and simultaneous agent based modelling is used to predict the pathways of released gametes and connectivity between reefs on a regional scale. Combined with set tolerance limits, the modelling can be used to predict the level of impacts from a given programme, and scenario type modelling can be used to optimise the dredging plan to minimise impacts. Taking this a step further, a reliable forecast model provides the opportunity to make informed proactive and adaptive management decisions of the dredging during a spawning period to minimise the impact on the coral gametes. The presentation will show examples of dredge plume and coral spawn modelling in Western Australia and discuss how this can be used to proactively manage the risks of impacts. The study was carried out using DHI MIKE Agent Based Modelling (ABM) tool. This integrates hydrodynamic, wave, sediment transport and the ABM models to define the dredge plume dispersion and concurrent behaviour of coral larvae in response to the environment. Examples of management measures will be provided and discussed.

Authors

Lai, C. S., DHI Water and Environment, Australia, lai@dhigroup.com

Pedersen, C., DHI Water and Environment, Malaysia, clp@dhigroup.com

Details

Oral presentation

Session #:50
Date: 06/23/2016
Time: 15:30
Location: 312

Presentation is given by student: No