Helicopter EM mapping of saltwater intrusion in Everglades National Park, Florida

Fitterman, David V.; Deszcz-Pan, Maria

doi:10.1071/eg998240

Cited by 136 publications

(71 citation statements)

References 15 publications

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“…The area underlying Taylor Slough, which is one of the primary sources of water to Florida Bay, is highly resistive (low conductivity), and the interface between freshwater and saltwater is much sharper than in the Shark River Slough area, perhaps because of a lack of tidally influenced streams in the Taylor Slough area (Fitterman and Deszcz-Pan, 1998). The area of low conductivity underlying Taylor Slough extends downward in the aquifer to at least 130 ft and may indicate that fresh surface water recharges the aquifer under the slough (Fitterman and Deszcz-Pan, 2001).…”

Section: Electromagnetic Methods To Delineate Freshwater-saltwater Inmentioning

confidence: 99%

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Ground water in freshwater-saltwater environments of the Atlantic Coast

Barlow¹

2003

Circular

250

213

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Section: Electromagnetic Methods To Delineate Freshwater-saltwater Inmentioning

confidence: 99%

“…Modified from R.A. Renken, U.S. Geological Survey, written commun., 2003. Data for landward limit of saltwater compiled from Koszalka (1995), Sonenshein (1997), Merritt (1996), Fitterman and Deszcz-Pan (1999), and Hittle (1999). …”

Section: Bmentioning

confidence: 99%

Ground water in freshwater-saltwater environments of the Atlantic Coast

Barlow¹

2003

Circular

250

213

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“…However, they don't allow detection of resistivity variations with depth and suffer in areas where the resistivity model departs significantly from that of a half-space. In order to distinguish vertical resistivity variations and obtain a formal measure of model validity one can use a multi-layer 1-D inversion (Beard, 2000;Constable et al, 1987;Fitterman and Deszcz-Pan, 1998;Paterson and Redford, 1986;Sengpiel and Siemon, 1998). These inversions are non-unique because they typically solve a heavily underdetermined problem.…”

Section: Frequency-domain Aem Inversion Methodsmentioning

confidence: 99%

Laterally Constrained Inversion of Fixed-Wing Frequency-Domain AEM Data

Tartaras¹,

Beamish²

2006

Near Surface 2006 - 12th EAGE European Meeting of Environmental and Engineering Geophysics

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SUMMARYNew highresolution airborne geophysical surveys of the UK, undertaken with the system developed under the Joint Airbornegeoscience Capability programme, established between the Geological Survey of Finland and the British Geological Survey, will provide large 4frequency airborne electromagnetic data sets. These data sets will be used to characterise the conductivity distribution of the subsurface for environmental and exploration purposes. To invert these large data sets in a fast and robust manner we have developed "LC1DINV", a laterally constrained onedimensional inversion algorithm. This algorithm inverts simultaneously for all observation points along a profile and regularises the inverse problem by requiring that differences between model parameters at adjacent points be small. We use the conjugate gradient method for minimising the data misfit subject to the lateral constraints and a priori model terms. We have inverted 4frequency data obtained over Suurpelto, a test area in southern Finland, characterised by conductive clays overlying a highly resistive granitic shield. The results show that LC1DINV can successfully locate the depth extent and variations of the clays. Comparison of these results with those obtained with two other types of inversion shows that LC1DINV produces welldefined layer boundaries and laterally smooth crosssections.

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“…The main purpose of using the relation between EM conductivity log response and chloride concentration is to allow the conversion of EM log response in wells where chloride sampling is not possible to estimate the chloride concentrations in the aquifer. A similar technique was used in California in PVC cased wells where groundwater samples for chloride concentration measurement were available with EM conductivity logs, and in Florida to map the saltwater interface using surface and borehole EM methods to produce logarithmic equations relating EM response to chloride concentration [25,33].…”

Section: Borehole-geophysical Loggingmentioning

confidence: 99%

Delineation of Salt Water Intrusion through Use of Electromagnetic-Induction Logging: A Case Study in Southern Manhattan Island, New York

Stumm

Como

2017

Water

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Abstract:Groundwater with chloride concentrations up to 15,000 mg/L has intruded the freshwater aquifer underlying southern Manhattan Island, New York. Historical (1940Historical ( -1950 chloride concentration data of glacial aquifer wells in the study area indicate the presence of four wedges of saltwater intrusion that may have been caused by industrial pumpage. The limited recharge capability of the aquifer, due to impervious surfaces and the 22.7 million liters per day (mld) of reported industrial pumpage early in the 20th Century was probably the cause for the saltwater intrusion and the persistence of the historical saltwater intrusion wedges over time. Recent drilling of wells provided new information on the hydrogeology and extent of saltwater intrusion of the glacial aquifer overlying bedrock. The new observation wells provided ground-water level, chloride concentration, hydraulic conductivity, and borehole geophysical data of the glacial aquifer. The glacial sediments range in thickness from less than 0.3 m to more than 76.2 m within the study area. A linear relation between Electromagnetic-induction (EM) conductivity log response and measured chloride concentration was determined. Using this relation, chloride concentration was estimated in parts of the glacial aquifer where sampling was not possible. EM logging is an effective tool to monitor changes in saltwater intrusion wedges.

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Helicopter EM mapping of saltwater intrusion in Everglades National Park, Florida

Cited by 136 publications

References 15 publications

Ground water in freshwater-saltwater environments of the Atlantic Coast

Ground water in freshwater-saltwater environments of the Atlantic Coast

Laterally Constrained Inversion of Fixed-Wing Frequency-Domain AEM Data

Delineation of Salt Water Intrusion through Use of Electromagnetic-Induction Logging: A Case Study in Southern Manhattan Island, New York

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