Author(s): Jing Fen Chua, Chi Wei Cheng, Aaroun Leiking, Edgar Peter Dabbi, Jacob Hjelmager Jensen, Juan Carlos Savioli
Linked Author(s): Chua Jing Fen
Keywords: Effluents, near-field and far-field, CORMIX, MIKE 3 FM, dynamic coupling.
Abstract: Predicting the dispersion of discharged contaminants is critical to support engineering design and the assessment of impacts on the ambient waters. Dispersion is crucial for the engineering design of marine outfalls as well as for the optimization of outfall configurations. The mixing of a discharged effluent with the receiving water can be described by its near-field and intermediate to far-field characteristics. CORMIX is capable of predicting the effluent dilution from the outfall in the near-field and far-field regions, however, the three-dimensional model of MIKE 3 FM is better at describing the natural-varying ambient current conditions that govern the intermediate and far-field dispersion. In order to provide a robust framework that encapsulates both regions, a dynamic coupling between the two models has been developed. This coupling ensures that the ambient conditions in the far-field modelling are imposed on the near-field simulation, and conversely, CORMIX predictions are influencing the far field. The latter by transferring the plume as discrete sources distributed in both vertical and horizontal layers of the MIKE 3 FM model. This paper presents the applications of various modelling approaches to predict the thermal effluent dispersion based on a synthetic case study in positive thermal release via two marine outfalls in the Malacca Straits, Malaysia. MIKE 21 FM and MIKE 3 FM modelling have been carried out to evaluate the two-dimensional and three-dimensional dispersal patterns and finally, coupling models between CORMIX and MIKE 3 FM have also been established for the case study
Year: 2017