Groundwater–surface water exchange in the intertidal zone detected by hydrologic and coastal oceanographic measurements

Heiss, James W.; Michael, Holly A.; Puleo, Jack A.

doi:10.1002/hyp.13825

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…Sous et al (2016) carried out a field experiment on a microtidal beach and revealed the presence of a rather consistent groundwater circulation pattern under the swash zone. Heiss, Michael, and Puleo (2020) demonstrated that the lens of infiltrating seawater that moves downward through the unsaturated zone to the water table, contributing to the formation of the circulation cell, moves landward and seaward as the tide and swash zone move across the beach surface.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Flow and Moisture Dynamics in the Swash Zone: Effects of Heterogeneous Hydraulic Conductivity and Capillarity

Geng

Heiss

Michael

et al. 2020

Water Resources Research

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A density‐dependent, variably saturated groundwater flow and solute transport model was used to investigate the influence of swash motions on subsurface flow and moisture dynamics in beach aquifers with heterogeneous distributions of hydraulic conductivity (K) and capillarity. The numerical simulations were performed within a Monte Carlo framework using field measurements conducted in the swash zone of a sandy beach. Our results show that heterogeneous capillarity causes spatially variable capillary rise above the groundwater table. In response to swash motions, heterogeneity creates capillary barriers that result in pockets of elevated moisture content beneath the swash zone. These moisture hotspots persist within the unsaturated zone even at ebb tide when the swash motions recede seaward. Heterogeneous capillarity also results in highly tortuous preferential flow paths and alters the flow rates from the sand surface to the water table. Heterogeneous K greatly enhances the seawater infiltration into the swash zone and modulates its spatial distribution along the beach surface. Due to heterogeneous K and capillarity, complex mixing patterns emerge. Both strain‐dominated and vorticity‐dominated flow regions develop and dissipate as tides and waves move across the beach surface. Complex mixing patterns of seawater percolating from the swash zone surface to the water table, with localized areas of high and low mixing intensities, are further demonstrated by analysis of dilution index. Our findings reveal the influence of geologic heterogeneity on swash zone moisture and flow dynamics, which may have important implications for sediment transport and chemical processing in beach aquifers.

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Section: Introductionmentioning

confidence: 99%

Groundwater Flow and Moisture Dynamics in the Swash Zone: Effects of Heterogeneous Hydraulic Conductivity and Capillarity

Geng

Heiss

Michael

et al. 2020

Water Resources Research

Self Cite

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show abstract

Geochemical fluxes in sandy beach aquifers: Modulation due to major physical stressors, geologic heterogeneity, and nearshore morphology

Geng

Heiss

Michael

et al. 2021

Earth-Science Reviews

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Impact of beach face slope variation on saltwater intrusion dynamics in unconfined aquifer under tidal boundary condition

Dalai

Dhar

2023

Flow Measurement and Instrumentation

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Groundwater–surface water exchange in the intertidal zone detected by hydrologic and coastal oceanographic measurements

Abstract: Groundwater-surface water exchange in the intertidal zone detected by hydrologic and coastal oceanographic measurements

Cited by 5 publications

References 19 publications

Groundwater Flow and Moisture Dynamics in the Swash Zone: Effects of Heterogeneous Hydraulic Conductivity and Capillarity

Groundwater Flow and Moisture Dynamics in the Swash Zone: Effects of Heterogeneous Hydraulic Conductivity and Capillarity

Geochemical fluxes in sandy beach aquifers: Modulation due to major physical stressors, geologic heterogeneity, and nearshore morphology

Impact of beach face slope variation on saltwater intrusion dynamics in unconfined aquifer under tidal boundary condition

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