The extent of saltwater intrusion in southern Baldwin County, Alabama

Murgulet, Dorina; Tick, Geoffrey R.

doi:10.1007/s00254-007-1068-0

Cited by 36 publications

(34 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, we would expect SGD to deliver nitrate with less dilution of salinity than occurs with river discharge. The observation that the highest groundwater elevation in coastal Baldwin County is adjacent to Little Lagoon (Murgulet and Tick, 2007) is consistent with nutrient supply by SGD playing a role in the elevated densities of Pseudo-nitzschia spp. at LLP.…”

Section: Little Lagoon Pass As a Pseudo-nitzschia Spp ''Hot Spot''mentioning

confidence: 52%

“…at LLP. Murgulet and Tick (2007) also showed the occurrence of salt-water intrusion to the near-surface aquifer underlying Little Lagoon, which implies direct hydrologic connectivity between this aquifer and the Gulf of Mexico waters near LLP. Thus LLP may receive greater nutrient inputs than the other sites following recharge of aquifers in Baldwin County.…”

Section: Little Lagoon Pass As a Pseudo-nitzschia Spp ''Hot Spot''mentioning

confidence: 95%

See 1 more Smart Citation

Temporal and spatial variability in Pseudo-nitzschia spp. in Alabama coastal waters: A “hot spot” linked to submarine groundwater discharge?

et al. 2009

View full text Add to dashboard Cite

Section: Little Lagoon Pass As a Pseudo-nitzschia Spp ''Hot Spot''mentioning

confidence: 52%

Section: Little Lagoon Pass As a Pseudo-nitzschia Spp ''Hot Spot''mentioning

confidence: 95%

Temporal and spatial variability in Pseudo-nitzschia spp. in Alabama coastal waters: A “hot spot” linked to submarine groundwater discharge?

et al. 2009

View full text Add to dashboard Cite

“…Nitrate concentrations in Aquifer A2 exceeded the regulatory drinking water standards (45 milligram per liter [mg/L] nitrate) (Murgulet and Tick ). Moreover, seawater contamination from both surface infiltration and lateral encroachment has been observed in Aquifers A1 and A2 (Walter and Kidd ; Chandler et al ; Murgulet and Tick ).…”

Section: Study Area and Descriptionmentioning

confidence: 99%

Characterization of Flow Dynamics and Vulnerability in a Coastal Aquifer System

Murgulet

Tick

2013

Groundwater

Self Cite

View full text Add to dashboard Cite

Traditional aquifer vulnerability techniques primarily rely on spatial property data for a region and are limited by their ability to directly or indirectly assess flow and transport processes occurring from the surface to depth within an aquifer system. The main objective of this study was to investigate groundwater vulnerability in terms of aquifer interconnectivity and flow dynamics. A combination of stable isotopes, groundwater age-dating (radiocarbon), and geomorphic/geogenic spatial analyses was applied to a regional, highly developed coastal aquifer to explain the presence of nitrate at depth. The average δ(13) C value (-17.3 ± 2‰ VPDB, n = 27) is characteristic of groundwater originating from locally infiltrated precipitation through extensively cultivated soils. The average δ(18) O and δD values (-4.0 ± 0.1‰ VSMOW, n = 27; δD: -19.3 ± 1‰ VSMOW, n = 27, respectively) are similar to precipitation water derived from maritime sources feeding the region's surface water and groundwater. Stable and radioactive isotopes reveal significant mixing between shallow and deep aquifers due to high velocities, hydraulic connection, and input of local recharge water to depths. Groundwater overdevelopment enhances deeper and faster modern water downward flux, amplifying aquifer vulnerability. Therefore, aquifer vulnerability is a variable, dependent on the type and degree of stress conditions experienced by a groundwater system as well as the geospatial properties at the near surface.

show abstract

“…According to the investigations proposed by Murgulet and Tick (2008), the coastal area in Baldwin County has long been experiencing a large extent of SI. The cross section illustrated in Fig.…”

Section: Numerical Examples and Simulation Parametersmentioning

confidence: 99%

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

Tsai

et al. 2016

Environ Monit Assess

View full text Add to dashboard Cite

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.

show abstract

The extent of saltwater intrusion in southern Baldwin County, Alabama

Cited by 36 publications

References 1 publication

Temporal and spatial variability in Pseudo-nitzschia spp. in Alabama coastal waters: A “hot spot” linked to submarine groundwater discharge?

Temporal and spatial variability in Pseudo-nitzschia spp. in Alabama coastal waters: A “hot spot” linked to submarine groundwater discharge?

Characterization of Flow Dynamics and Vulnerability in a Coastal Aquifer System

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

Contact Info

Product

Resources

About