Geologic effects on groundwater salinity and discharge into an estuary

Russoniello, Christopher J.; Fernández, C.; Bratton, John F.; Banaszak, J.; Krantz, David E.; Andres, A.S.; Konikow, Leonard F.; Michael, Holly A.

doi:10.1016/j.jhydrol.2013.05.049

Cited by 79 publications

(54 citation statements)

References 68 publications

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“…First, to characterize smaller-scale variability of nitrogen concentrations in fresh groundwater discharge. Second, to confirm observations made at this (Russoniello et al, 2013;Sawyer et al, 2014) and other (Durand, 2014) …”

Section: Nutrient Samplingsupporting

confidence: 64%

“…One feature of particular hydrogeologic interest in the watershed are low-K paleovalley features, which extend offshore of many of the marshes fringing the Inland Bays (Chrzastowski, 1986;Krantz et al, 2004). These organic-rich features act as a cap on the aquifer and have been shown to affect the distribution Russoniello et al, 2013) and chemistry (Böhlke and Krantz, 2003;Sawyer et al, 2014) of groundwater discharging to the Inland Bays.…”

Section: Study Sitementioning

confidence: 99%

“…Nutrient measurements at Holts Landing State Park indicate that nitrate in fresh groundwater discharging beneath and around carbon-rich paleovalley cap features is removed prior to discharge, whereas nitrate concentrations in groundwater discharging in the nearshore areas of sandy interfluves are elevated Fernandez, 2012;Sawyer et al, 2014). Groundwater discharge rates are also low in the paleovalleys and much higher and focused in the sandy interfluves (Russoniello et al, 2013;Sawyer et al, 2014). This pattern, where nitrate concentrations are elevated in areas of focused discharge, has also been observed elsewhere (Durand, 2014).…”

Section: Nutrient Samplingmentioning

confidence: 99%

“…(Fig. 1) where a paleovalley and interfluve were previously mapped in detail (Russoniello et al, 2013). Paleovalley samples were collected from the aquifer beneath low-K paleovalley-fill sediments (n = 53), and 'interfluve' samples were collected from high-K interfluve sediments (n = 34).…”

Section: Nutrient Samplingmentioning

confidence: 99%

See 3 more Smart Citations

Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed

Russoniello

Konikow

Kroeger

et al. 2016

Journal of Hydrology

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Section: Nutrient Samplingsupporting

confidence: 64%

Section: Study Sitementioning

confidence: 99%

Section: Nutrient Samplingmentioning

confidence: 99%

Section: Nutrient Samplingmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed

Russoniello

Konikow

Kroeger

et al. 2016

Journal of Hydrology

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“…In the arid and semi-arid climatic condition, evaporation, ion exchange reactions, oxidation-reduction processes, dissolution and precipitation of minerals takes place in the aquifer, which alters groundwater chemistry [9][10][11]. In the coastal aquifer, surface contamination sources play a major role on water pollution due to shallow depth compared to natural processes.…”

Section: Introductionmentioning

confidence: 99%

Coastal Aquifer Contamination and Geochemical Processes Evaluation in Tugela Catchment, South Africa—Geochemical and Statistical Approaches

Ntanganedzeni

Elumalai

Rajmohan

2018

Water

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Abstract:Assessment of groundwater quality, contamination sources and geochemical processes in the coastal aquifer of Tugela Catchment, South Africa were carried out by the geochemical and statistical approach using major ion chemistry of 36 groundwater samples. Results suggest that the spatial distribution pattern of EC, TDS, Na, Mg, Cl and SO 4 are homogenous and elevated concentrations are observed in the wells in the coastal region and few wells near the Tugela River. Wells located far from the coast are enriched by Ca, HCO 3 and CO 3 . Durov diagrams, Gibbs plots, ionic ratios, chloro alkaline indices (CAI1 and CAI2) and correlation analysis imply that groundwater chemistry in the coastal aquifer of Tugela Catchment is regulated by the ion exchange, mineral dissolution, saline sources, and wastewater infiltration from domestic sewage; septic tank leakage and irrigation return flow. Principle component analysis also ensured the role of saline and anthropogenic sources and carbonates dissolution on water chemistry. Spatial distributions of factor score also justify the above predictions. Groundwater suitability assessment indicates that around 80% and 90% of wells exceeded the drinking water standards recommended by the WHO and South African drinking water standards (SAWQG), respectively. Based on SAR, RSC, PI, and MH classifications, most of the wells are suitable for irrigation in the study region. USSL classification suggests that groundwater is suitable for coarse-textured soils and salt-tolerant crops. The study recommends that a proper management plan is required to protect this coastal aquifer efficiently.

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Saltwater‐freshwater mixing dynamics in a sandy beach aquifer over tidal, spring‐neap, and seasonal cycles

Heiss

Michael

2014

Water Resources Research

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The biogeochemical reactivity of sandy beach aquifers is closely linked to physical flow and solute transport processes. Thus, a clearer understanding of the hydrodynamics in the intertidal zone is needed to accurately estimate chemical fluxes to the marine environment. A field and numerical modeling study was conducted over a 1 year timeframe to investigate the combined effects of tidal stage, spring-neap variability in tidal amplitude, and seasonal inland water table oscillations on intertidal salinity and flow dynamics within a tide-dominated, microtidal sandy beach aquifer. Measured and simulated salinities revealed an intertidal saline circulation cell with a structure and cross-sectional mixing zone area that varied over tidal, spring-neap, and seasonal time scales. The size of the circulation cell and area of the mixing zone were shown for the first time to be most affected by seasonal water table oscillations, followed by tidal amplitude and tidal stage. The intertidal circulation cell expanded horizontally and vertically as the inland water table declined, displacing the fresh discharge zone and lower interface seaward. Over monthly spring-neap cycles, the center of the circulation cell shifted from beneath the backshore and upper beachface to the base of the beach. Salinity variations in the intertidal zone over semidiurnal tidal cycles were minimal. The dynamics of the circulation cell were similar in simulations with and without a berm. The highly transient nature of intertidal salinity over multiple time scales may have important implications for the types and rates of chemical transformations that occur in groundwater prior to discharge to the ocean.

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Geologic effects on groundwater salinity and discharge into an estuary

Cited by 79 publications

References 68 publications

Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed

Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed

Coastal Aquifer Contamination and Geochemical Processes Evaluation in Tugela Catchment, South Africa—Geochemical and Statistical Approaches

Saltwater‐freshwater mixing dynamics in a sandy beach aquifer over tidal, spring‐neap, and seasonal cycles

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