Potentiometric surface of the Miocene-Pliocene aquifer system of Baldwin County, Alabama, 1995

Robinson, James L.; Moreland, Richard S.; Clark, Amy E.

doi:10.3133/ofr96590

Cited by 1 publication

(2 citation statements)

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“…In this study, the left boundary is the land boundary and right boundary represents the sea boundary with defined tidal fluctuations in the simulations. The left boundary is defined based on the field observations reported in Robinson et al (1996a). Based on the study of Robinson et al (1996a), the water level at the boundary varies in the range of 0.5 to 1 m below the ground surface.…”

Section: Conceptual Model and Hydrogeological Conditionsmentioning

confidence: 99%

“…The left boundary is defined based on the field observations reported in Robinson et al (1996a). Based on the study of Robinson et al (1996a), the water level at the boundary varies in the range of 0.5 to 1 m below the ground surface. A constant total head value of 99.25 m was considered for the base case in this study.…”

Section: Conceptual Model and Hydrogeological Conditionsmentioning

confidence: 99%

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Effects of hydrogeological properties on sea-derived benzene transport in unconfined coastal aquifers

Tsai

et al. 2016

Environ Monit Assess

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This paper presents numerical investigations on quantifying the hydrodynamic effects of coastal environment factors, including tidal fluctuations, beach slopes, hydraulic conductivity, and hydraulic gradients on sea-derived benzene transport in unconfined coastal aquifers. A hydrologic transport and mixed geochemical kinetic/equilibrium reactions in saturated-unsaturated media model was used to simulate the spatial and temporal behaviors of the density flow and benzene transport for various hydrogeological conditions. Simulation results indicated that the tidal fluctuations lead to upper saline plumes (USPs) near the groundwater and seawater interfaces. Such local circulation zones trapped the seaward benzene plumes and carried them down in aquifers to the depth depending on the tide amplitudes and beach slopes across the coastal lines. Comparisons based on different tidal fluctuations, beach slopes, hydraulic conductivity, and hydraulic gradient were systematically conducted and quantified. The results indicated that areas with USPs increased with the tidal amplitude and decreased with the increasing beach slope. However, the variation of hydraulic conductivity and hydraulic gradient has relatively small influence on the patterns of flow fields in the study. The increase of the USP depths was linearly correlated with the increase of the tidal amplitudes. The benzene reactive transport simulations revealed that the plume migrations are mainly controlled by the local flow dynamics and constrained in the USP circulation zones. The self-cleaning process of a coastal aquifer is time-consuming, typically requiring double the time of the contamination process that the benzene plume reach the bottom of a USP circulation zone. The presented systematic analysis can provide useful information for rapidly evaluating seaward contaminants along a coastal line with available hydrogeological properties.

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Section: Conceptual Model and Hydrogeological Conditionsmentioning

confidence: 99%

Section: Conceptual Model and Hydrogeological Conditionsmentioning

confidence: 99%