Todd Halihan

Oklahoma State University

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Garey A. Fox

North Carolina State University

Derek M. Heeren

University of Nebraska–Lincoln

Ronald B. Miller

Oklahoma State University

Paulo Galvão

Universidade Federal de Minas Gerais

Vitaly A. Zlotnik

University of Nebraska–Lincoln

Daniel E. Storm

Oklahoma State University

Ricardo Hirata

Universidade de São Paulo

John M. Sharp

The University of Texas at Austin

Caitlin Barnes

Oklahoma State University

Aaron R. Mittelstet

University of Nebraska–Lincoln

Cooperative Institutions

Oklahoma State University

United States Geological Survey

University of Nebraska–Lincoln

Oklahoma State University Oklahoma City

Environmental Protection Agency

Flinders University

National Centre for Groundwater Research and Training

University of California, Santa Barbara

University of Wisconsin–Madison

Denver Federal Center

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ESTUDO DE ISÓTOPOS ESTÁVEIS PARA CONFIRMAR INTERCONEXÕES ENTRE LAGOAS E ÁGUAS SUBTERRÂNEAS, SETE LAGOAS/MG

DOAJ (DOAJ: Directory of Open Access Journals) (2019)

Paulo Galvão Ricardo Hirata Todd Halihan Rafael Terada

O suprimento de agua da cidade de Sete Lagoas/MG e quase totalmente subterrânea do Aquifero Carstico Sete Lagoas (ACSL), com uma pequena contribuicao de um aquifero fraturado. Na parte central urbana da cidade e comum a ocorrencia de lagoas e feicoes carsticas (e.g. cavernas, dolinas e sumidouros), levantando duvidas se essas feicoes podem ser conexoes hidraulicas de aguas superficiais com o ACSL e, portanto, zonas sensiveis a possiveis contaminacoes antropicas. Sendo assim, o objetivo deste trabalho e identificar possiveis interacoes entre aguas superficiais e subterrâneas a partir do uso dos isotopos estaveis 18O e 2H. As amostras de aguas subterrâneas foram coletadas no aquifero carstico localizado na area urbana central e no aquifero fraturado na porcao sul da cidade. Amostras de aguas superficiais foram coletadas nas sete principais lagoas e a agua da chuva foi amostrada por um periodo de um ano. Os resultados dos isotopos estaveis indicaram que a origem da agua subterrânea e diretamente da precipitacao local, tendo um periodo de recarga limitado. A area urbana central, onde os sedimentos cenozoicos inconsolidados sobrepoem aos calcarios da Formacao Sete Lagoas, e em areas com sumidouros e entradas de cavernas, bem como as proprias lagoas amostradas, foram confirmadas como sendo as areas mais sensiveis a contaminacao do ACSL.

River valley

10.14295/ras.v0i0.29412

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Identifying connections in a fractured rock aquifer using ADFTs

Ground Water (2005)

Todd Halihan Andrew Love John M. Sharp

Abstract Fractured rock aquifers are difficult to characterize because of their extremely heterogeneous nature. Developing an understanding of fracture network hydraulic properties in these aquifers is difficult and time consuming, and field testing techniques for determining the location and connectivity of fractures in these aquifers are limited. In the Clare Valley, South Australia, well interference is an important issue for a major viticultural area that uses a fractured aquifer. Five fracture sets exist in the aquifer, all dipping >25°. In this setting, we evaluate the ability of steady‐state asymmetric dipole‐flow tests (ADFTs) to determine the connections between a test well and a set of piezometers. The procedure involves dividing a test well into two chambers using a single packer and pumping fluid from the upper chamber to the lower chamber. By conducting a series of tests at different packer elevations, an “input” signal is generated in fracture zones connected to the test well. By monitoring the “output” response of the hydraulic dipole field at piezometers, the connectivity of the fractures between the test well and piezometers can be determined. Results indicate the test well used in this study is connected in a complex three‐dimensional geometry, with drawdown occurring above and below areas of potentiometric buildup. The ADFT method demonstrates that the aquifer evaluated in this study cannot be modeled effectively on the well scale using continuum flow models.

Piezometer

Aquifer test

Aquifer properties

MODFLOW

10.1111/j.1745-6584.2005.0029.x

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Environmental monitoring using Electrical Resistance Tomography

ASEG Extended Abstracts (2003)

Tania Dhu Stewart Greenhalgh Graham Heinson Todd Halihan Craig T. Simmons

Landfill sites and saline disposal basins are just two of the numerous situations in which escape of fluids from the system can contaminate soils and groundwater. Techniques to map fluid flow, delineate the extent of contamination and monitor changes during remediation are needed for environmental monitoring applications. Theoretical and laboratory-based testing of Electrical Resistance Tomography (ERT) was undertaken to examine the capabilities and limitations of this method.The performance of a series of two-dimensional numerical models led to the conclusions that a contaminant plume can be imaged, that downhole current transmission sites with both downhole and surface potential measurement sites is preferable and that smaller scale fingering effects associated with free convection are not readily resolved. It also highlighted the importance of electrode configuration for successful ERT surveying. An ERT survey conducted in a glass tank to monitor the development of a dense, saline plume was also conducted. Visual comparison of photographs with ERT images agreed with theoretical results.

Electrical Resistivity Tomography

10.1071/aseg2003ab036

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An Instrument for the Determination of a Hydropneumograph in a Bubbling Spring

Ground Water (2019)

Robert J. Agnew Todd Halihan Lantz Holtzhower Brian Norton

Abstract In order to enable greater accuracy in the determination of the mass discharge of gas and water‐gas ratios (WGR) in groundwater from springs, we have developed a field‐deployable instrument using commercially available components to independently measure the gas and water mass flow rates in springs with bubbling mixed‐phase flow. Collecting and measuring the free gas phase will allow for further compositional analysis that may be useful in improving gas‐derived parameters such as recharge temperature and age, as well as quantification of methanogenesis and flux of crustal/mantle gasses. By installing a phase separator at the spring discharge, a thermal mass flow sensor is utilized to measure the gas flow rate (ebullition + flux) generated from a spring. The water flow rate is determined by a standard weir. Field performance of the device was tested on a spring discharging from the Arbuckle‐Simpson aquifer near the town of Connerville in south‐central Oklahoma, USA.

Separator (oil production)

Hot spring

Weir

Mass flux

Countercurrent exchange

Mass flow

10.1111/gwat.12901

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HYDROGEOLOGIC CONCEPTUAL MODEL OF PSEUDO-KARST IN THE GARBER-WELLINGTON FORMATION, OKLAHOMA

Abstracts with programs - Geological Society of America (2019)

Jordon P. Massey Todd Halihan John P. Hager Jessica Juenger

Conceptual model

10.1130/abs/2019am-340624

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Analysis of subsurface mound spring connectivity in shale of the western margin of the Great Artesian Basin, South Australia

Hydrogeology Journal (2013)

Todd Halihan Andrew Love Mark Keppel Volmer Berens

10.1007/s10040-013-1034-8

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Heterogeneity influences on stream water–groundwater interactions in a gravel-dominated floodplain

Hydrological Sciences Journal (2014)

Ron Miller Derek M. Heeren Garey A. Fox Todd Halihan D. E. Storm

Floodplains are composed of complex depositional patterns of ancient and recent stream sediments, and research is needed to address the manner in which coarse floodplain materials affect stream–groundwater exchange patterns. Efforts to understand the heterogeneity of aquifers have utilized numerous techniques typically focused on point-scale measurements; however, in highly heterogeneous settings, the ability to model heterogeneity is dependent on the data density and spatial distribution. The objective of this research was to investigate the correlation between broad-scale methodologies for detecting heterogeneity and the observed spatial variability in stream/groundwater interactions of gravel-dominated alluvial floodplains. More specifically, this study examined the correlation between electrical resistivity (ER) and alluvial groundwater patterns during a flood event at a site on Barren Fork Creek, in the Ozark ecoregion of Oklahoma, USA, where chert gravels were common both as streambed and as floodplain material. Water table elevations from groundwater monitoring wells for a flood event on 1–5 May 2009 were compared to ER maps at various elevations. Areas with high ER matched areas with lower water table slope at the same elevation. This research demonstrated that ER approaches were capable of indicating heterogeneity in surface water–groundwater interactions, and that these heterogeneities were present even in an aquifer matrix characterized as highly conductive. Portions of gravel-dominated floodplain vadose zones characterized by high hydraulic conductivity features can result in heterogeneous flow patterns when the vadose zone of alluvial floodplains activates during storm events. EDITOR D. Koutsoyiannis; ASSOCIATE EDITOR X. Chen

10.1080/02626667.2014.992790

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Citations (14)

Induced Seismicity

Springer eBooks (2018)

Caitlin Barnes Todd Halihan

10.1007/978-1-4939-2493-6_976-1

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美国地质调查局确定的经历地表以下注水引起的可能地震活动的区域水文地质数据的可用性

Hydrogeology Journal (2017)

Caitlin Barnes Todd Halihan

Seismic risk

Geological survey

10.1007/s10040-017-1699-5

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Geophysical Surveys To Characterize The Hydrogeology Of The Arbuckle Uplift, South-Central Oklahoma

21st EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems (2008)

Bruce D. Smith Charles D. Blome David V. Smith Daniel D. Scheirer Maria Deszcz‐Pan

Airborne and ground electrical resistivity and magnetic surveys as well as ground gravity measurements have been conducted to map the subsurface geologic and hydrologic features of the<br>Arbuckle Uplift. The main target of these investigations is the Paleozoic Arbuckle-Simpson aquifer and the surrounding stratigraphic units of the Arbuckle Uplift in south-central Oklahoma. In March, 2007, helicopter-borne electromagnetic (resistivity) and magnetic survey was flown of four areas with distinctly different geology were flown using measurement systems. The airborne resistivity measurements were made at six different frequencies ranging from 400 Hz to 115,000 Hz which provided a depth of penetration from a few meters to about 80 m. Ground resistivity profiling has been conducted in several areas of the uplift for subsurface resistivity imaging. Two of the resistivity profiles are in the area encompassed by the airborne survey. Total field magnetic and high precision location (GPS and laser altimeter) measurements were also made as part of the airborne survey. Ground gravity and magnetic profiling was also conducted to refine location of structures in specific areas. The geology of the study area consists of dolomitic limestone (Arbuckle and Simpson Groups) that generally lies in fault contact with younger Paleozoic clastic and carbonate rocks. The formational units are gently dipping except on the flanks of the uplift. The geophysical maps, resistivity depth sections, and interpreted cross sections from the magnetic and gravity data are being used to improve the geologic mapping and better define hydrologic features of the area.

Electrical Resistivity Tomography

10.3997/2214-4609-pdb.177.101

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Citations (3)