Analytical solution for tidal propagation in a coupled semi-confined/phreatic coastal aquifer

Jeng, Dong‐Sheng; Li, Ling; Barry, David Andrew

doi:10.1016/s0309-1708(02)00016-7

Cited by 94 publications

(95 citation statements)

References 13 publications

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“…Numerous researchers have carried out theoretical calculations and field and laboratory experiments to study the interaction of ocean, coastal groundwater, sediment and salt transport (Li et al, 2002;Lee et al, 2007;Bakhtyar et al, 2011). Three different approaches have been used to compute these processes driven by oceanic forcing Sediment deposition is usually enhanced when the level of the beach watertable is lower than the SWL, while a higher groundwater level increases beach erosion, as has been shown in laboratory experiments (Li et al, 2002a;Bakhtyar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Numerous researchers have carried out theoretical calculations and field and laboratory experiments to study the interaction of ocean, coastal groundwater, sediment and salt transport (Li et al, 2002;Lee et al, 2007;Bakhtyar et al, 2011). Three different approaches have been used to compute these processes driven by oceanic forcing (Robinson et al, 2009): (i) field experiments; (ii) laboratory measurements; and (iii) numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

“…The two-dimensional numerical simulations of Li and Barry (2000) showed that this circulation was affected by the beach groundwater table elevation relative to the Still Water Level (SWL). However, these studies, like numerous other studies on coastal aquifer behavior (e.g., Parlange et al, 1984;Barry et al, 1996;Li et al, 1999Li et al, , 2000a Li et al, ,b, 2001Li et al, , 2002bJeng et al, 2002Jeng et al, , 2005a, ignored density variations of pore water and associated densitydependent flows in the beach aquifer. The extent of seawater intrusion into fresh groundwater depends on the sea level, the tidal range of coastal waters, wave cycle, the groundwater recharge rate, and the porosity and sediment composition of the intertidal area.…”

mentioning

confidence: 99%

“…Most previous numerical investigations focused on wave motion on impermeable beds and 6 neglected the effect of in/exfiltration. However, a mechanistic understanding of the nearshore environment needs to account for interactions of seawater and beach groundwater (Horn, 2006), in particular the role of oceanic motion on sediment transport, foreshore profile changes and salinity distribution.Numerous researchers have carried out theoretical calculations and field and laboratory experiments to study the interaction of ocean, coastal groundwater, sediment and salt transport (Li et al, 2002;Lee et al, 2007;Bakhtyar et al, 2011). Three different approaches have been used to compute these processes driven by oceanic forcing Sediment deposition is usually enhanced when the level of the beach watertable is lower than the SWL, while a higher groundwater level increases beach erosion, as has been shown in laboratory experiments (Li et al, 2002a;Bakhtyar et al, 2011).…”

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confidence: 99%

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Numerical experiments on interactions between wave motion and variable-density coastal aquifers

Bakhtyar

Barry

Brovelli

2012

Coastal Engineering

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A comprehensive two-dimensional (cross-shore) process-based numerical model of nearshore hydrodynamics (based on the Navier-Stokes equations, k-ε turbulence closure and the Volume-Of-Fluid method), beach morphology, and variable-density groundwater flow (SEAWAT-2000) was developed. This model, which was applied at the field scale, relaxes simplifications in existing models that do not include such detailed mechanistic descriptions. Numerical experiments were conducted to investigate the effects of varying aquifer, beach and wave characteristics (e.g., inland groundwater head, sand grain size, different wave heights and periods) on the coupled system. Spilling and plunging breakers on dissipative and intermediate beaches were simulated. For a given set of boundary conditions, the model was run for 1 y without the hydrodynamic sub-model to achieve a realistic salt-/freshwater interface. Then, the hydrodynamic component was run for 15 min and the model results analyzed. The main features considered were groundwater circulation, saltwater wedge position, in/exfiltration across the beach face, and beach morphology. The predictions of the numerical model agree well with existing understanding and experimental measurements. For an inland watertable that is lower than the still water level (SWL), such that the groundwater flow is mainly landward, on both coarse and fine sand beaches the addition of wave motion moves the saltwater wedge further landward. For an inland watertable that is higher than the SWL, the opposite behavior occurred. The numerical experiments showed that more sediment transport takes place on intermediate beaches than on dissipative beaches. In addition, beach profile variations are greater under plunging breakers, while coarse sand beaches are steeper than fine sand beaches for the same wave conditions. There is a strong correlation between in/exfiltration and beach face deposition/erosion for the coarse beaches, while in/exfiltration has a slight effect on sediment transport for fine beaches. The model is capable of simulating the short-term evolution of foreshore profile changes, and beach 3 watertable and saltwater wedge movement due to interactions between wave motion and coastal groundwater. IntroductionMost previous investigations concerned with modeling of interactions between ocean water and coastal groundwater focused on tide-induced watertable fluctuations, neglecting high-frequency wave-induced oscillations and variable-density groundwater flow (e.g., Teo et al., 2003;Brovelli et al., 2007;Robinson et al., 2007bRobinson et al., , 2009Slooten et al., 2010;Li et al., , 2007Xin et al., 2010). However, given the interplay of mechanisms inherent in coastal processes -mixing of fresh-and seawater driven by waves, sediment transport and beach profile changes -it is not possible to extrapolate readily existing results to realistic coastal zone behavior.Waves in the nearshore zone are an important forcing on sediments and groundwater behavior. While waves induce instantaneous pore wat...

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Section: Introductionmentioning

confidence: 99%

“…Numerous researchers have carried out theoretical calculations and field and laboratory experiments to study the interaction of ocean, coastal groundwater, sediment and salt transport (Li et al, 2002;Lee et al, 2007;Bakhtyar et al, 2011). Three different approaches have been used to compute these processes driven by oceanic forcing (Robinson et al, 2009): (i) field experiments; (ii) laboratory measurements; and (iii) numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical experiments on interactions between wave motion and variable-density coastal aquifers

Bakhtyar

Barry

Brovelli

2012

Coastal Engineering

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“…Assumption (a) was proposed by Jiao and Tang (1999) and used by Li and Jiao (2001a,b). The discussions about assumption (a) by Volker and Zhang (2001), Jiao and Tang (2000), Li et al (2001), Jiao (2002a,c), andJeng et al (2002) show that the assumption is valid for realistic aquifer systems because the leakance of a realistic leaky layer is small and the specific yield of the unconfined aquifer is several orders of magnitude greater than the storativity of the confined aquifer. Assumption (b) was proposed by Hantush (1960) in the case of radial groundwater flow to a well.…”

Section: Introductionmentioning

confidence: 99%

Tidal groundwater level fluctuations in L-shaped leaky coastal aquifer system

Jiao

2002

Journal of Hydrology

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This paper presents an analytical solution to describe tidal groundwater level fluctuations in a coastal leaky aquifer system bounded by water -land boundaries that form a right angle (referred to as L-shaped coastlines). The system consists of an unconfined aquifer, a confined aquifer and a leaky layer between them. Previously published analytical solutions that discuss only single aquifer constitute a special case of the new solution when the permeability of leaky layer approaches zero. A simple approximate solution without integral is presented. Error analysis and hypothetical example show that the approximate solution has adequate accuracy for both groundwater level prediction and parameter estimation for an L-shaped leaky aquifer system. q

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Analysis of Tide and Offshore Storm‐Induced Water Table Fluctuations for Structural Characterization of a Coastal Island Aquifer

Trglavcnik

Morrow

Weber

et al. 2018

Water Resources Research

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Analysis of water table fluctuations can provide important insight into the hydraulic properties and structure of a coastal aquifer system including the connectivity between the aquifer and ocean. This study presents an improved approach for characterizing a permeable heterogeneous coastal aquifer system through analysis of the propagation of the tidal signal, as well as offshore storm pulse signals through a coastal aquifer. Offshore storms produce high wave activity, but are not necessarily linked to significant onshore precipitation. In this study, we focused on offshore storm events during which no onshore precipitation occurred. Extensive groundwater level data collected on a sand barrier island (Sable Island, NS, Canada) show nonuniform discontinuous propagation of the tide and offshore storm pulse signals through the aquifer with isolated inland areas showing enhanced response to both oceanic forcing signals. Propagation analysis suggests that isolated inland water table fluctuations may be caused by localized leakage from a confined aquifer that is connected to the ocean offshore but within the wave setup zone. Two‐dimensional groundwater flow simulations were conducted to test the leaky confined‐unconfined aquifer conceptualization and to identify the effect of key parameters on tidal signal propagation in leaky confined‐unconfined coastal aquifers. This study illustrates that analysis of offshore storm signal propagation, in addition to tidal signal propagation, provides a valuable and low resource approach for large‐scale characterization of permeable heterogeneous coastal aquifers. Such an approach is needed for the effective management of coastal environments where water resources are threatened by human activities and the changing climate.

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Analytical solution for tidal propagation in a coupled semi-confined/phreatic coastal aquifer

Cited by 94 publications

References 13 publications

Numerical experiments on interactions between wave motion and variable-density coastal aquifers

Numerical experiments on interactions between wave motion and variable-density coastal aquifers

Tidal groundwater level fluctuations in L-shaped leaky coastal aquifer system

Analysis of Tide and Offshore Storm‐Induced Water Table Fluctuations for Structural Characterization of a Coastal Island Aquifer

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