TRANSPORT MODEL ON BEHAVIOR OF IRON(II) AT SALINITY TRANSITION IN COASTAL AQUIFER

Abstract

In a coastal aquifer, fresh and salt groundwater behavior is often complicated due to uncertain hydro-geological structures. Recently, special attention is put on the analyses of fresh and salt groundwater behavior by hydro-geologists and marine environment researchers who concern for submarine groundwater discharge containing nutrients.
In order to solve these subjects, geochemical and hydro-geological investigations need to be simultaneously carried out. To meet such demand, fundamental study for both fresh water and salt groundwater flow and geo-chemical mass transport are indispensable. In this paper, a numerical model for predicting iron-based solute transport which contributes to redox and cation exchange reactions was developed. Validation of the model was confirmed by one-dimensional column experiment and two-dimensional cross section setup. Specifically, the precipitation of divalent iron by oxidation along the fresh and salt water mixing zone was reasonably modeled by the proposed approach.