Geoelectrical signals of geologic and hydrologic processes in a fringing reef lagoon setting

Befus, K. M.; Cardenas, M. Bayani; Tait, Douglas R.; Erler, Dirk V.

doi:10.1016/j.jhydrol.2014.05.070

Cited by 27 publications

(31 citation statements)

References 67 publications

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“…This is further supported by area of lower salinity and 222 Rn concentrations towards the centre of the lagoon that have been shown to be similar to, or in some cases above concentrations closer to shore (Tait et al, 2013b). Resistivity surveys across the lagoon also implied the occurrence of fresh groundwater in the middle of the lagoon (Befus et al, 2014). Although a small portion of nutrient laden modern groundwater entered the lagoon via streams and springs (b2%), the majority is likely stored and delivered at a later date.…”

Section: Limitations and Uncertaintiesmentioning

confidence: 69%

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

et al. 2014

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Section: Limitations and Uncertaintiesmentioning

confidence: 69%

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

et al. 2014

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“…(b) Barium (nmol/kg), NO 3 − (μmol/L), and δ 15 N‐NO 3 − (‰) across the Muri Lagoon, Rarotonga (Cook Islands). Assumed groundwater flow paths into and beneath the lagoon are based on the work of (Befus et al, ). The groundwater discharge at the interface between the lagoon and the island consists of seeps that formed a small creek draining into the lagoon (salinity 2–23).…”

Section: Introductionmentioning

confidence: 99%

Coral Skeletons Record Increasing Agriculture‐Related Groundwater Nitrogen Inputs to a South Pacific Reef Over the Past Century

Erler

Shepherd

Linsley

et al. 2018

Geophysical Research Letters

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Anthropogenic activity on tropical islands has been linked with nitrogen (N) contamination of groundwater and subsequent coral reef health decline. However, identifying the temporal patterns of groundwater N contamination has proven difficult because of an absence of long‐term records. Here we use δ15N in coral skeleton organic material (CS‐δ15N) to reconstruct historical patterns of groundwater N discharge to a coral reef system at Rarotonga in the Cook Islands in the South Pacific. Analysis of coral skeletal material dating back to 1880 CE clearly shows that the δ15N of N available in the reef environment around Rarotonga increased between 1980 and 2000. We propose that rapid agricultural development in the Cook Islands between 1960 and 1985 increased aquifer N concentrations leading to the elevated δ15N of groundwater NO3−. The discharge of this groundwater N appears to have continued for at least 15 years after the cessation of the agricultural boom. This has important implications for the management of groundwater contamination on low‐lying tropical islands.

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“…), salinity of the water column and saturated sediment (Befus et al . ), array configuration (Manheim et al . ; Day‐Lewis et al .…”

Section: Methodsmentioning

confidence: 99%

Terrestrial and marine electrical resistivity to identify groundwater pathways in coastal karst aquifers

O’Connell

Daly

Henry

et al. 2017

Near Surface Geophysics

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Groundwater movement in karst aquifers is characterised by high‐velocity fissure and conduit flow paths, and in coastal karst aquifers, these act as pathways for saline intrusion and freshwater discharge to the sea. This paper examines groundwater movement in two neighbouring catchments in the west of Ireland that represent canonical coastal karst aquifers dominated by discharges in the intertidal zone and at offshore submarine springs. Terrestrial and surface‐towed marine electrical resistivity tomography, coupled with ancillary hydrogeological data, identifies the influence of faulting and conduits on groundwater egress/saltwater ingress. The on‐shore and off‐shore subsurface geometry of major fault zones is identified, and the tidal influence of seawater and ground‐water flow is demonstrated in these zones and karst springs. Imaging of these sub‐surface structures is a pre‐requisite for numerical modelling of current and future climate‐driven freshwater–seawater interactions in karst coastal aquifers.

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Geoelectrical signals of geologic and hydrologic processes in a fringing reef lagoon setting

Cited by 27 publications

References 67 publications

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

Coral Skeletons Record Increasing Agriculture‐Related Groundwater Nitrogen Inputs to a South Pacific Reef Over the Past Century

Terrestrial and marine electrical resistivity to identify groundwater pathways in coastal karst aquifers

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