Author(s)

G.A. Tularam & W. Glamore

Abstract

This paper reports on a mathematical model developed to simulate salinity intrusion in coastal waterways in the south eastern coastal lowlands of the Gold Coast (Australia) to neutralize acidity caused by pyrite oxidation. The model was used to predict the effect of salinity intrusion upstream of existing floodgates. Predictions of the model compared favourably with the field results. Intrusion of saline water can increase the pH of the upland water can from 2.4 to about 6.5, while the salt levels remain low enough so that it is not of concern to the landholders. Based on the computer predictions and experimental observations, it was concluded that the Nerang river flood mitigation system ought to be redesigned to allow controlled tidal water intrusion upland of the floodgates to neutr

Keywords