Geological controls and tidal forcing of submarine groundwater discharge from a confined aquifer in a coastal sand dune system

Holliday, D. V.; Ridd, Peter V.; Read, Wayne

doi:10.1029/2006jc003580

Cited by 16 publications

(12 citation statements)

References 20 publications

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“…They found that the discharge was inversely related to the tide: low tide produced the strongest discharge, and at high tide, the discharge weakened and could even reverse. Similar results were reported for a submarine spring in Australia [24]. Parra et al [26,27] also report similar results for springs in the Mexican Caribbean coast.…”

Section: Introductionsupporting

confidence: 79%

“…Holliday et al [24] analyze the geologic controls on submarine groundwater discharge from a confined aquifer and Fleury et al [25] present a review of submarine springs located in karstic aquifers. They found that the main mechanisms involved in the hydrodynamics of the submarine springs are the aquifer discharge and the saline intrusion through conduits.…”

Section: Introductionmentioning

confidence: 99%

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On the Understanding of the Hydrodynamics and the Causes of Saltwater Intrusion on Lagoon Tidal Springs

Pacheco-Castro

Salles

Canul-Macario

et al. 2021

Water

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Springs are common features on the Yucatán coast. They can discharge either under the sea (submarine) or inland in coastal lagoons and wetlands. Previous observations of a coastal lagoon located on the northern Yucatán Peninsula (La Carbonera) reported sea water intrusion on a spring that discharge on a coastal lagoon (lagoon tidal spring). The saltwater intrusion occurs when the tide is at its lower level, which is the opposite to what has been reported for submarine springs in the Yucatán Peninsula. In this study, the hydrodynamics of the spring is analyzed and the driving forces controlling the seawater intrusion are identified and discussed. Time series of water levels, salinity, and velocity measurements in the lagoon, the aquifer, and the spring are analyzed by means of tide component decomposition and cross-correlations analysis of the tide signals. Results show that the main driving forces causing the intrusion are the density differences and pressure head gradients, and the mechanisms influencing the driving forces driving those differences are the tides, the friction in the lagoon, and the confinement of the aquifer; other mechanisms are discussed to present a complete idea of the complexity of the interactions between the coastal aquifer, the coastal lagoons, and the sea.

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Section: Introductionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

On the Understanding of the Hydrodynamics and the Causes of Saltwater Intrusion on Lagoon Tidal Springs

Pacheco-Castro

Salles

Canul-Macario

et al. 2021

Water

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“…7) were used to estimate the water volume change over time ( . This seasonal variability in karstic groundwater inputs is likely linked to variations on the terrestrial hydraulic gradient, as commonly observed in groundwater studies in coastal systems (Garcia-Solsona et al, 2010;Holliday et al, 2007;Rodellas et al, 2012;Smith et al, 2008).…”

Section: Water Mass Balancementioning

confidence: 72%

Groundwater-driven nutrient inputs to coastal lagoons: The relevance of lagoon water recirculation as a conveyor of dissolved nutrients

Rodellas

Stieglitz

Andrisoa

et al. 2018

Science of The Total Environment

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Evaluating the sources of nutrient inputs to coastal lagoons is required to understand the functioning of these ecosystems and their vulnerability to eutrophication. Whereas terrestrial groundwater processes are increasingly recognized as relevant sources of nutrients to coastal lagoons, there are still limited studies evaluating separately nutrient fluxes driven by terrestrial groundwater discharge and lagoon water recirculation through sediments. In this study, we assess the relative significance of these sources in conveying dissolved inorganic nutrients (NO, NH and PO) to a coastal lagoon (La Palme lagoon; France, Mediterranean Sea) using concurrent water and radon mass balances. The recirculation of lagoon water through sediments represents a source of NH (1900-5500 mol d) and PO (22-71 mol d), but acts as a sink of NO. Estimated karstic groundwater-driven inputs of NO, NH and PO to the lagoon are on the order of 200-1200, 1-12 and 1.5-8.7 mol d, respectively. A comparison between the main nutrient sources to the lagoon (karstic groundwater, recirculation, diffusion from sediments, inputs from a sewage treatment plant and atmospheric deposition) reveals that the recirculation of lagoon water through sediments is the main source of both dissolved inorganic nitrogen (DIN) and phosphorous (DIP) to La Palme lagoon. These results are in contrast with several studies conducted in systems influenced by terrestrial groundwater inputs, where groundwater is often assumed to be the main pathway for dissolved inorganic nutrient loads. This work highlights the important role of lagoon water recirculation through permeable sediments as a major conveyor of dissolved nutrients to coastal lagoons and, thus, the need for a sound understanding of the recirculation-driven nutrient fluxes and their ecological implications to sustainably manage lagoonal ecosystems.

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“…Naturally, the coastal aquifers are in equilibrium with respect to the freshwater-saline water interface 2186 Hydrological Sciences Journal -Journal des Sciences Hydrologiques, 59 (12) 2014 http://dx.doi.org/10. 1080/02626667.2013.871013 and flow to the sea with minor oscillations affected by tidal heights (Holliday et al 2007). Generally, coastal freshwater zones have limited potential (volume wise) and such strategic resources are always precarious when they are over-exploited.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeologically controlled freshwater dynamics in the coastal sand dune aquifer of Ongole coast (AP), India

Reddy

Nagabhushanam

Madhav

et al. 2014

Hydrological Sciences Journal

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A sand dune area,~50 km 2 in size, the only source of freshwater in the coastal zone of Prakasham district, Andhra Pradesh, India, is bounded by marine sediments in the northwest, and the Bay of Bengal in the southeast. Measurements of groundwater level, hydrochemistry and stable isotopes for three years facilitated the identification of the aquifer response to drought and intense cyclonic storms. There was no major change in hydrochemistry and isotope values between drought and highly saturated conditions, except in a few wells in the northwest. During drought, the groundwater remained fresh, although the levels dipped to 2-5 m b.m.s.l., signifying no saline water ingression (no measurable bromide). Based on the field observations, resistivity soundings, electrical conductivity and groundwater level change due to pumping, the existence of impermeable boundaries in the northwest and southeast are hypothesized. Thus, the existing hydrogeological settings appear to be inhibiting the movement of the freshwater-saline water interface into the freshwater zone.

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Geological controls and tidal forcing of submarine groundwater discharge from a confined aquifer in a coastal sand dune system

Cited by 16 publications

References 20 publications

On the Understanding of the Hydrodynamics and the Causes of Saltwater Intrusion on Lagoon Tidal Springs

On the Understanding of the Hydrodynamics and the Causes of Saltwater Intrusion on Lagoon Tidal Springs

Groundwater-driven nutrient inputs to coastal lagoons: The relevance of lagoon water recirculation as a conveyor of dissolved nutrients

Hydrogeologically controlled freshwater dynamics in the coastal sand dune aquifer of Ongole coast (AP), India

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