ABSTRACT

Kong, J., Shen, C.J., Ye, R.H., 2013. Analytical research on the tidally-induced groundwater wave propagation mechanism in coastal aquifers.

With increasingly more attention paid to coastal environment, research on the interaction between subsurface and surface water has become a hot subject. Being different from surface water, tidally-induced groundwater moves slower with special over-height far away from the coastal line, which is higher than the mean sea level. Such a special hydrodynamic characteristic hints the special propagation mechanism is different from traditional surface wave. In order to reveal the tidally-induced groundwater wave propagation mechanism and analyze the influence of latent coastal beach profile variation because of mean sea level rise, theoretical research is focused on a newly derived high-order analytical solution corresponding to non-linear Boussinesq equation applied on sloping beach. Research indicates that: Firstly, the tidal induced groundwater wave energy mainly concentrates on the former three order constituent waves. The variation of beach profile because of sea level rise will not change the proportion relationship among the constituent waves; Secondly, the over-height's increase is influenced by the conductivity decrease, porosity enlargement or tidal amplitude widening; Thirdly, mild beach slope and large conductivity are favorable for wave propagating with longer wavelength. In the end, the rise of mean sea level increases the aquifer thickness and then leads to the faster propagation speed of groundwater wave, lower over-height and makes the interaction between surface and subsurface water more intensively reflected in farther tidal wave signal landwards.

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