engleski

Wastewater concentration dynamics during joint operation of several submarine outfalls

It is a frequent case that larger coastal towns have several wastewater submarine outfalls in relatively close vicinity. Thus, it happens that acceptable wastewater concentrations at a particular outfall affect the concentrations in the vicinity of another outfall and may change them considerably. This refers in particular to the situations where the action of sea currents is present. Theoretically, linear superimposition in the spatial and temporal sense can be assumed. In this work an attempt was made to determine it by means of a physical model. On a distorted physical eco-hydraulic model the discharge of wastewater during parallel operation of three outfalls of different capacity and length designed for implementation within the framework of Split MEIP (Municipal Environmental Infrastructure) was modelled. The model was tested under the conditions with and without the presence of sea currents and under the assumption of vertical stratification absence. The spatial way of the effluent concentration propagation was researched, and the effluent concentrations during separate operation of each particular outfall and their joint operation were measured. Three types of tracers were used as effluent in order to measure the concentrations and visualise mixing, i.e. flow.

distorted physical hydraulic model; parallel and individual operation of outfalls

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