Abstract

A considerable threat facing both estuary rivers and aquifers is seawater intrusion. Published articles emphasise modelling the intrusion, either mathematically or numerically, using software that lacks the capacity to introduce a hydrodynamic solution to mitigate the intrusion into fresh water. This paper presents a proposed solution for seawater intrusion using contractions. COMSOL software was used to simulate the intrusion into a hypothetical 10 km-long, 1 km-wide canal with an 80% contraction ratio. The simulation used three different conditions across four different contraction geometries, in addition to a default canal. The results show that the best geometries are the double semicircles and the wide contraction. For a 10 km canal length, the range of 10%-20% of the effective concentration will only intrude for just 0.75 km beyond the contraction.