Digital surfaces and thicknesses of selected hydrogeologic units of the Floridan aquifer system in Florida and parts of Georgia, Alabama, and South Carolina

Williams, Lester J.; Dixon, Joann F.

doi:10.3133/ds926

Cited by 10 publications

(9 citation statements)

References 9 publications

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“…The five regions include the sands and gravels of the glacial origin aquifer system of New England (United States Geological Survey Aquifer Code: N100GLCIAL), the North Atlantic Coastal Plain aquifer system ranging from New York to North Carolina (S100NATLCP); the Southeastern Atlantic Coastal Plain aquifer system in North and South Carolina (S100SECSLP); the Floridan aquifer system in Georgia, Florida, and Alabama (S400FLORDN); and the coastal lowlands aquifer system in the central and western Gulf of Mexico covering portions of Alabama, Mississippi, Louisiana, and Texas (S100CSLLWD), which in this study are split into eastern and western Gulf of Mexico model regions. The published hydrogeologic framework data are highly constrained and were derived from integrated borehole data, geologic mapping, and calibrated hydrologic models (Table S1 in the supporting information) (Schlische, ; Martin & Whiteman, ; Ator et al, ; Resor & DeBoer, ; Thompson et al, ; Campbell & Coes, ; Maine Geological Survey, ; Soller et al, ; Dalton et al, ; Gleeson et al, ; Nielsen & Locke, ; Williams & Dixon, ; Masterson et al, ; Williams & Kuniansky, ; Bayless et al, ). These data sets spanned each subregion and supplied the model geologic structure and hydraulic properties: the horizontal hydraulic conductivity ( K h ), vertical hydraulic conductivity ( K v ), the number of model layers, the extent of various units, and the thickness of the layers (Table S1).…”

Section: Hydrogeologic Settingsmentioning

confidence: 99%

The Magnitude and Origin of Groundwater Discharge to Eastern U.S. and Gulf of Mexico Coastal Waters

Befus

Kroeger

Smith

et al. 2017

Geophysical Research Letters

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Fresh groundwater discharge to coastal environments contributes to the physical and chemical conditions of coastal waters, but the role of coastal groundwater at regional to continental scales remains poorly defined due to diverse hydrologic conditions and the difficulty of tracking coastal groundwater flow paths through heterogeneous subsurface materials. We use three‐dimensional groundwater flow models for the first time to calculate the magnitude and source areas of groundwater discharge from unconfined aquifers to coastal waterbodies along the entire eastern U.S. We find that 27.1 km3/yr (22.8–30.5 km3/yr) of groundwater directly enters eastern U.S. and Gulf of Mexico coastal waters. The contributing recharge areas comprised ~175,000 km2 of U.S. land area, extending several kilometers inland. This result provides new information on the land area that can supply natural and anthropogenic constituents to coastal waters via groundwater discharge, thereby defining the subterranean domain potentially affecting coastal chemical budgets and ecosystem processes.

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Section: Hydrogeologic Settingsmentioning

confidence: 99%

The Magnitude and Origin of Groundwater Discharge to Eastern U.S. and Gulf of Mexico Coastal Waters

Befus

Kroeger

Smith

et al. 2017

Geophysical Research Letters

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“…Given that subterranean water removals through the aquifer grew regularly by 630 mlgd from 1950 to 3,3430 mlgd by 1990. Since the permitting process and tougher regulations instituted in the 1990s shortened the rising extractions, the taking away of water rose to 4020 mlgd because of the dangerous levels of aridity in the entire Southeast region in 1999 and 2001 [46,47]. In that light, much of the hydrological stress at that time, emerged as result of mounting demands from the region's farm sector.…”

Section: Methodsmentioning

confidence: 99%

Assessing Water Resource Issues Among States in the US South East Region

Merem¹,

Twumasi²,

Wesley³

et al. 2020

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The US Southeast region is endowed with vast deposits of water resource assets located in numerous states.Considering the growing water use to serve rapidly expanding land uses from agriculture, residential areas, thermoelectric to industrial facilities. Over the years, the demand for water to meet the needs of various sectors in the zone has precipitated increased withdrawals, declining levels in aquifers and sectorial imbalance in the distribution. Accordingly, sectorial imbalance and stress attributed to socio-economic, physical and ecological parameters is now being felt in the areas many considered fully endowed with hydrological assets and less vulnerable to depletion. Beset by the management implications of the trends, various agencies in the zone have stepped up mitigation measures. Notwithstanding the gravity of the challenges and the fact that most studies are still festooned with projected depletion patterns in the US arid West, very little work exists in the literature on the changing patterns in water resource use in the Southeast region using a mix scale model. For that, this research will fill that void by assessing the variabilities in water resource use among some states in the Southeast. With emphasis on the issues, trends, factors, and impacts, the study uses secondary info from major data agencies analyzed by mix scale techniques of descriptive statistics and Geographic Information Systems (GIS) to assess the tendencies. The results point to changes in usage among the sectors in the form of gains and declines, the emergence of hydroelectricity and irrigation as the largest users, the dominance of Florida, regional dependence on surface water sources, evidence of depletion and spatial dispersion of these trends across the states. With these changes attributed to various elements, the paper offered suggestions ranging from water conservation measures, the adoption of efficient polices to the design of a regional hydrological information system.

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“…The hydrogeologic framework for the Floridan aquifer system (FAS) has been revised (Williams and Kuniansky, 2015;Williams and Dixon, 2015) as part of a national program to assess groundwater availability by the U.S. Geological Survey Water Availability and Use Science Program. New studies and data that have become available since the original framework established by the U.S. Geological Survey in the 1980s (Miller, 1986;Bellino, 2011) were used in the revised framework, which is a product intended for regional (greater than 10,000 square miles [mi 2 ]) and subregional (1,000 to 10,000 mi 2 ) investigations, rather than site-scale (less than 1 mi 2 ) investigations.…”

Section: Introductionmentioning

confidence: 99%

“…Because there are actually three different discontinuous units that are used to separate the Upper and Lower FAS, and more zonations of permeability variations occur vertically in peninsular Florida, model layer 5 is composed of both the Lower FAS in the northern part of the study area and the Upper FAS in peninsular Florida. The variation in hydraulic properties of subregions is based on the revised framework (Williams and Kuniansky, 2015) using the spatial datasets for the framework (Williams and Dixon, 2015) and using aquifer test datasets Kuniansky and others, 2012). The current regional model of the freshwater part of the system has an equal-spaced model grid with 5,000-ft sides, and has a total of 863,971 active cells.…”

Section: Introductionmentioning

confidence: 99%

U.S. Geological Survey Karst Interest Group Proceedings, San Antonio, Texas, May 16–18, 2017

2017

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit https://www.usgs.gov/ or call 1-888-ASK-USGS (1-888-275-8747).For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Kuniansky, E.L., and Spangler, L.E., eds., 2017, U.S. Geological Survey Karst Interest Group Proceedings, San Antonio, Texas, May 16-18, 2017: U.S. Geological Survey Scientific Investigations Report 2017-5023, 245 p., https://doi.org/10.3133/sir20175023. ISSN 2328-0328 (online) iii Contents Introduction and AcknowledgmentsKarst aquifer systems are present throughout parts of the United States and some of its territories, and have developed in carbonate rocks (primarily limestone and dolomite) and evaporites (gypsum, anhydrite, and halite) that span an interval of time encompassing more than 550 million years. The depositional environments, diagenetic processes, post-depositional tectonic events, and geochemical weathering processes that form karst aquifers are varied and complex. These factors involve biological, chemical, and physical changes that when combined with the diverse climatic regimes in which karst development has taken place, result in the unique dual-or triple-porosity nature of karst aquifers. These complex hydrogeologic systems typically represent challenging and unique conditions to scientists attempting to study groundwater flow and contaminant transport in these terrains.The dissolution of carbonate rocks and the subsequent development of distinct and beautiful landscapes, caverns, and springs have resulted in the most exceptional karst areas being designated as national or state parks. Tens of thousands of similar areas in the United States have been developed into commercial caverns and known privately owned caves. Both public and private properties provide access for scientists to study the flow of groundwater in situ. Likewise, the range and complexity of landforms and groundwater flow systems associated with karst terrains are enormous, perhaps more than for any other aquifer type. Karst aquifers and landscapes that form in tropical areas, such as the cockpit karst along the north coast of Puerto Rico, differ greatly from karst landforms in more arid climates, such as the Edwards Plateau in west-central Texas or the Guadalupe Mountains near Carlsbad, New Mexico, where hypogenic processes have played a major role in speleogenesis. Many of these public and private lands also contain unique flora and fauna associated with these karst hydrogeologic systems. As a result, numerous federal, st...

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Digital surfaces and thicknesses of selected hydrogeologic units of the Floridan aquifer system in Florida and parts of Georgia, Alabama, and South Carolina

Abstract: Contours for the top of the low-resistivity interval below the OLDSPZ fig24_LowResZone_below_OLD-SPZ_ptsPoints for the top of the OLDSPZ

Cited by 10 publications

References 9 publications

The Magnitude and Origin of Groundwater Discharge to Eastern U.S. and Gulf of Mexico Coastal Waters

The Magnitude and Origin of Groundwater Discharge to Eastern U.S. and Gulf of Mexico Coastal Waters

Assessing Water Resource Issues Among States in the US South East Region

U.S. Geological Survey Karst Interest Group Proceedings, San Antonio, Texas, May 16–18, 2017

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