Estimating hydraulic properties of coastal aquifers using wave setup

Rotzoll, Kolja; El‐Kadi, Aly I.

doi:10.1016/j.jhydrol.2008.02.005

Cited by 42 publications

(25 citation statements)

References 25 publications

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“…This analytical solution however has not been applied to field observations in a more heterogeneous coastal aquifer system. To the authors' knowledge, Rotzoll and El‐Kadi () is the only study that has attempted to estimate coastal aquifer properties based on analysis of the propagation of wave setup through an aquifer. However, in their analysis they assumed wave setup variations can be represented as a continuous sinusoidal signal rather than discrete pulse signals which better represent offshore storm events.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Previous studies have applied the above simple 1D expressions (Equations 3 and ) to estimate D for coastal aquifers (Schultz and Ruppel ; Zhou ), riverbank aquifers (Trefry and Johnston ), island aquifers (Trefry and Bekele ; Rotzoll and El‐Kadi ), and atoll aquifers (Chattopadhyay et al ). To further constrain T and S (or K and S s ), independent measurements including slug tests and pumping tests are often conducted in conjunction with tidal methods (Erskine ; Millham and Howes ; Trefry and Johnston ).…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Degree of Aquifer Confinement and Anisotropy on Tidal Pulse Propagation

Shuai¹,

Knappett

Hossain

et al. 2017

Groundwater

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Oceanic tidal fluctuations which propagate long distances up coastal rivers can be exploited to constrain hydraulic properties of riverbank aquifers. These estimates, however, may be sensitive to degree of aquifer confinement and aquifer anisotropy. We analyzed the hydraulic properties of a tidally influenced aquifer along the Meghna River in Bangladesh using: (1) slug tests combined with drilling logs and surface resistivity to estimate Transmissivity (T); (2) a pumping test to estimate T and Storativity (S) and thus Aquifer Diffusivity (D ); and (3) the observed reduction in the amplitude and velocity of a tidal pulse to calculate D using the Jacob-Ferris analytical solution. Average Hydraulic Conductivity (K) and T estimated with slug tests and borehole lithology were 27.3 m/d and 564 m /d, respectively. Values of T and S determined from the pumping test ranged from 400 to 500 m /d and 1 to 5 × 10 , respectively with D ranging from 9 to 40 × 10 m /d. In contrast, D estimated from the Jacob-Ferris model ranged from 0.5 to 9 × 10 m /d. We hypothesized this error resulted from deviations of the real aquifer conditions from those assumed by the Jacob-Ferris model. Using a 2D numerical model tidal pulses were simulated across a range of conditions and D was calculated with the Jacob-Ferris model. Moderately confined (K /K < 0.01) or anisotropic aquifers (K /K > 10) yield D within a factor of 2 of the actual value. The order of magnitude difference in D between pumping test and Jacob-Ferris model at our site argues for little confinement or anisotropy.

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“…Hawaii, USA 10 À2 Wave setup method and numerical modeling Rotzoll and El-Kadi (2008b) Regional value for dike-free basalts Kilauea rift zone b Hawaii, USA P10 À3 Numerical modeling/singlewell mud-loss rates Ingebritsen and Scholl (1993) Unaltered surficial basalts Kilauea rift zone b Hawaii, USA 610 À8 Regional numerical modeling Ingebritsen and Scholl (1993) Deeply buried (>1 km) hydrothermally altered basalts a Based on transmissivity data and assuming an aquifer thickness of 100 m. b Converted from intrinsic permeability.…”

mentioning

confidence: 99%

Noble gases and coupled heat/fluid flow modeling for evaluating hydrogeologic conditions of volcanic island aquifers

Heilweil

Healy

Harris

2012

Journal of Hydrology

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Estimating hydraulic properties of coastal aquifers using wave setup

Cited by 42 publications

References 25 publications

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

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

The Impact of the Degree of Aquifer Confinement and Anisotropy on Tidal Pulse Propagation

Noble gases and coupled heat/fluid flow modeling for evaluating hydrogeologic conditions of volcanic island aquifers

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