I reviewed clustering applied to the seawater intrusion problem around the world (Article Seawater intrusion pattern recognition supported by unsuperv...
). I describe how this approach is used to support seawater intrusion identification. In the review, there was a case study in Tanzania (
Article Delineation of groundwater provenance in a coastal aquifer u...
), maybe you can check that article to look for similarities with respect to Mombasa. Also, this paper (https://www.sciencedirect.com/science/article/abs/pii/S0022169421008945?via%3Dihub) is highly recommended for you.