2021 : Accurate Prediction for Soil-Water Permeability Coefficient using Tidal Response

Dr.Eng. Kriyo Sambodho ST., M.Eng



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The time-series analyses of the observed performances of tides and tidally induced groundwater-level fluctuations have made it possible to resolve them into the trend components in response to seasonal variations of tidal range and those in response to the astronomical tides. It is found that the backshore groundwater level is persistently higher than the tidal level, thereby permitting the fresh groundwater discharge into the sea. The Fourier spectrum analyses then permit the determination of the groundwater-level fluctuations that in fact respond systematically to the four major tidal components: K1, O1, M2 and S2. It is found that for either of the semi-diurnal and diurnal tidal forcings, the amplitude of the groundwater-level fluctuations decays exponentially with increasing distance landward from the shoreline, along with substantial phase lags. The extents of the amplitude decay and of the phase lag are accentuated by the semi-diurnal tides compared with the diurnal tides, in a manner compatible with the theoretical predictions. The tidal-response procedure thus proves to be a reliable one, facilitating the identification of the aquifer transfer coefficient (C) under field conditions.