Abstract

One of the considerable threats that faces both estuary rivers and aquifers is seawater intrusion. The published articles emphasized on modelling the intrusion both mathematically or numerically by software, with a noticeable deficit on introducing a hydrodynamic solution which mitigate the intrusion within fresh water. This paper presents a proposal sustainable solution for the seawater intrusion. The solution is based on using contractions. To introduce the solution, COMSOL software is used to simulate the intrusion within a hypothetical canal of 10 km length, 1 km width, and 80% contraction ratio. Three different scenarios of conditions under four different geometries of contractions, in addition to default canal, were used in simulation. The results show that the best geometries are the double semicircle and the wide contraction. For 10 km canal length, the range of (10% - 20%) of effecting concentration will only intrude for just 0.75 km beyond the contraction.