Engineers Australia

A time-series analysis of tidal effects on groundwater salinity

G. A. Tularam and P. Keeler


A time series approach may also be applied to model tidal intrusion into coastal aquifers. The authors examine the effect of tidal behaviour on groundwater level and salinity intrusion for the coastal Brisbane region using autocorrelation and spectral analyses. The results show a close relationship between tidal behaviour, groundwater depth and salinity levels for the Brisbane coast. The known effect can be quantified and incorporated in new models in order to more accurately map salinity intrusion into coastal groundwater.