Determining the hydraulic properties of coastal aquifer systems using groundwater response to tidal fluctuations: applicability and limitations

Figures & data

Figure 1. Schematic diagram of a semi-infinite, leaky confined coastal aquifer system imposed by dual-frequency ocean tides on the coastline boundary (modified from Li and Jiao 2002a)

Figure 2. The response of hydraulic head within the leaky confined aquifer due to dual-frequency tidal fluctuations: (a) time-dependent variations over x = 0 to 300 m; (b) time-dependent variations at x = 100 m and 200 m, and compared with ocean tides

Figure 3. The effects of aquifer system hydraulic properties on the transport of ocean tides within the leaky confined aquifer: (a) effects of the hydraulic diffusivity of leaky confined aquifer; (b) effects of the leakage of semi-impermeable aquitard

Table 1. The distance(m) at which the hydraulic head within the confined aquifer decays to 0.1 of the maximum amplitude of ocean tides

	D (Hydraulic diffusivity)(m^2/day)
L (Leakage) (day)^−1	500	1000	10,000	2,000,000	40,000,000
0	20.9637	29.6455	93.7434	1325.81	5929.25
0.05	20.952	29.6146	92.7829	457.219	471.344
1	20.7486	29.0907	76.7228	102.978	104.496

Figure 4. Comparisons between identified hydraulic parameters and true values, and simulated curves and monitored hydraulic heads: (a) noise = N(0, 0.1²); (b) noise = N(0, 0.05²)

Li, H. L., and J. J. Jiao. 2002a. “Analytical Solutions of Tidal Groundwater Flow in Coastal Two-aquifer System.” Advances in Water Resources 25: 417–426. doi:10.1016/S0309-1708(02)00004-0.

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