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22nd EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
- Conference date: 29 Mar 2009 - 02 Apr 2009
- Location: Forth Worth, Texas, USA
- Published: 29 March 2009
21 - 40 of 124 results
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Time-lapse Seismic Measurements on a Small Earthen Embankment during an Internal Erosion Experiment
Authors C.J. Hickey, A. Ekimov, G.J. Hanson and J.M. SabatierThe failure of earthen embankments is associated with erosion, overtopping, seepage, piping,
slope failures, and slides. Precursory evidence for certain failures can be identified by visual inspection;
however, others are not so easily detected. Seismic imaging and monitoring may provide unique and
valuable precursory information about the onset of piping, seepage, and anomalous pore pressures to
assist in the evaluation of the integrity of an earthen embankment.
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Sub-bottom Acoustic Survey and Bank Stability Analysis of Lake Carolyn, Irving, Texas
More LessLake Carolyn, in Irving Texas is a 111 acre artificial lake that serves as a water feature for the mixed residual and commercial community of Las Colinas. The lake fills a 2,500 acre-ft borrow pit, excavated in 1977 in the Cretaceous Eagle Ford Formation and alluvium of the nearby Elm Fork River.
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Practical Aspects Of Masw Inversion Using Varying Density
Authors J. Ivanov, G. Tsoflias, R. Miller and J. XiaWe use multi-channel analysis of surface waves (MASW) on seismic data to assess the practical impact of the assumed compressional-velocity and density parameters on the inverted shear-wave velocity results. The practical secondary-parameter impact evaluation was performed on data acquired in the arctic. The ice-sheet compressional-, shear-wave velocity and density variations with depth were available from laboratory and field measurement and served as reference for analyzing the MASW inversion.
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Combined Use of Frequency-Domain Electromagnetic and Electrical Resistivity Surveys to Delineate the Freshwater/Saltwater Interface near Saline Lakes in the Nebraska Sand Hills
Authors J. Ong, E. White, J. Lane Jr. and V. ZlontikWe investigate the use of frequency-domain electromagnetic (FDEM) and electrical resistivity
(ER) surveys for rapid and detailed characterization of the direction of lake-aquifer fluxes and the
configuration of salt plumes generated from saline lakes. This methodology was developed and applied
at several lakes in the Nebraska Sand Hills, Nebraska, in an area with both freshwater and saline lakes
hydraulically connected to the freshwater surficial aquifer.
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Roughness of layered geological media and the implications for interpretation of transient electromagnetic response of a loop source
Authors K. Decker and M. EverettA new theoretical model has been developed for transient controlled-source electromagnetic (CSEM) exploration of multi-layer aquifers. The method is applicable to fractured rock and other types of lithology which exhibit length-scale dependent heterogenity. A roughness parameter β is used, in the present paper, as a proxy for fracture density.
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Looking Inside Pores: Polarization by Constrictivity of Pores
More LessThe model of membrane induced polarization (diffusion coupling) was proposed by Marshal and
Madden (1959). This type of polarization occurs in sediments containing pores with different surface
areas, mobilities of ions and transfer numbers. It is also named polarization by constrictivity of pores
(Schön, 1996).
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Finite Difference Modeling of Near-Surface Electroseismic Coupling
Authors E. Hinz, J. Bradford and P. DonaldsonThe electroseismic phenomenon is a conversion from electromagnetic energy to elastic wave
energy that occurs at electric double layers, such as clay-water interfaces, where charge has
accumulated. The electroseismic coupling and measured response are functions of a number of physical
properties that control ionic strength and current flow; coupling increases with increased pore water
conductivity, temperature, and permeability and with decreased pore tortuosity, viscosity, and volumeto-
surface ratios in the pores.
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A Decade of Lessons Learned at a Geophysical Test Site
By W. SauckThe WMU geophysical test site contains steel drums, plastic drums, pipes, and objects of
archaeological interest, in a 50x200m area. Repeat measurements at a magnetic base station clearly
show the large secular change decrease. New galvanized steel pipe has very strong remanence that
decays with time.
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Geoenvironmental Shallow Geophysical Investigations on the Central Part of Dakahlyia Governorate, Eastern Nile Delta, Egypt
Authors A. El Mahmoudi, A. Bassal, M. El Gamili and G. MansourThis study is concerned with investigating the subsurface geology of the Holocene- Late
Pleistocene lithostratigraphic sequence in the central part of Dakahlyia Governorate, east Nile Delta
using the shallow penetration geophysical techniques.
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Time Domain Electromagnetic Soundings to Delineate Hydrocarbon Contamination of Ground Water
Authors V. Hallbauer-Zadorozhnaya and E. StettlerThere are two principal indicators for the presence of hydrocarbons in groundwater: an increase
in the electrical resistivity of the groundwater saturated layer and an induced polarization effect
(IP). The electro-osmosis type IP superimposes on the time domain electromagnetic (TDEM)
soundings an effect that distorts the signals.
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Salt water intrussion assessment using vertical electrical soundings, global optimisation methods and support vector machines
Geophysical inverse problems are ill-posed: the objective function has its minimum in a flat
elongated valley or surrounded by many local minima. Local optimization methods give unpredictable
results if no prior information is available. Traditionally this has generated mistrust on the use of
geophysical inverse methods (equivalence problem in VES).
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Integrated Geophysical Investigation of a Complex Groundwater Basin
Authors L. Wood Dudash, T. Morgan and J. KennedyThe Pauma groundwater basin in southern California provides a substantial portion of the irrigation water for agricultural operations in the Pauma Valley. As imported water becomes more scarce and more costly, increasing demands are placed upon this local resource. To better understand the basin and maximize the sustainable use of local groundwater, Yuima Municipal Water District (YMWD) commissioned an integrated geophysical investigation of the valley.
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Using Geophysical Methods to Determine Geologic Controls on Remote Springs in Death Valley, California
Authors J. Jansen, M. King, T. Powell and J. LoughrySprings can be supported by large regional flow systems or relatively small more local systems.
The spring will respond differently to local stresses or climatic changes depending on its flow system. It
is often difficult to determine the source of a spring due to the remote nature of many springs, and sparse
subsurface information.
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Seismic Evidence of Faulting at Three Different Geologic Scales in the Arbuckle-Simpson Aquifer, Oklahoma
Authors B. Kennedy, R.A. Young and C. RussianSeismic reflections from boundaries within the Ordovician Arbuckle-Simpson aquifer correlate with boundaries seen in well logs and cores. Seismic surveys at different geologic scales within this karst aquifer display the same fault character regardless of the survey’s target depth. Faults observed at intermediate depths in the Arbuckle-Simpson aquifer extend upward to the location of mapped fault traces, and such faults are seen clearly on ground penetrating radar and electrical resistivity imaging surveys.
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Resistivity Imaging Study for Seawater Intrusion Near Limestone Mine in Western Coast of India
Authors P. Pujari, A. Soni, C. Padmakar and P.S. KelkarThe Kovaya Limestone Mine is situated on the Saurashtra coast of India. Though the Mine is dependent on the Desalination plant installed in the Plant for its domestic and industrial water requirements, there is significant withdrawal of groundwater by the large number of bore wells and open wells, which are present in the agricultural fields lying in the leased area of the mine. The heavy withdrawal of groundwater has led to intrusion of seawater.
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The "Nuclear Renaissance" and its Implications for Geophysics - Keynote Session
Authors T. Dobecki and M. KickConstruction of nuclear power plants in the United States has experienced a long,
roughly 30 year hiatus – effectively skipping a generation of geophysicists. Current
political ads and pledges, changes in environmental attitudes, as well as streamlining of
licensing procedures all point to a coming boom (“Nuclear Renaissance”) in nuclear plant
expansion and new construction.
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Electrical Geophysical Performance Monitoring of Amendment Enhanced Bioremediation
Authors R. Versteeg, T. Johnson and W. MajorEnhanced bioremediation is increasingly used to accelerate cleanup of recalcitrant compounds and has been identified as the preferred remedial treatment at a substantial number of contaminated DoD (Department of Defense) sites.
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Estimating Concrete Quality with Ultra Sonic Surface Waves
Authors G. Young and S. DiBenedettoThis is a case history of a seismic NDE investigation conducted on a high-density, reinforced concrete radiation-shielding wall around the X-Ray room of a newly constructed hospital addition. The study presents the findings of the seismic investigation and contains an assessment on the presence of voids or other areas of potential concern within the wall as well as an estimate of density of the concrete. The methodology was the ultra-sonic surface wave technique using measurements from the Portable Seismic Property Analyzer (PSPA) manufactured by Geomedia Research & Development. Estimates of concrete density were done by drawing from techniques used in well log analysis.
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Characterization of solid waste in a bioreactor landfill using seismic borehole methods
Authors T. Glancy, C. Samson and P. Van GeelThe biodegradation of solid waste in bioreactor landfills is dependant on a number of factors
including moisture content. Identification of relatively wet and dry areas throughout the landfill would
help operators determine where moisture should be added or not. This study attempts to utilize seismic
borehole techniques to identify changes in seismic wave velocity through the waste due to the addition
of moisture.
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Geoelectrical Methods for Detection of Oil Contaminations in Soils and Bioremediation Process Monitoring
Authors B. Zogala, R. Dubiel, W. Zuberek, M. Robak, M. Steininger and K. WzientekThe goal of the experiment was to verify the geoelectrical methods as a tool for detection of oil
contaminations in soils and to monitor their bioremediation process. The survey area of approximately
2000 m2 is situated in the former military camp Borne Sulinowo in NW Poland. The area is covered by
fluvioglacial sediments composed of sands and gravels with the first water level at the 11 ¸ 12 m depth.
Numerous shallow bore-holes were drilled to recognize the detailed geological structure. The
measurements with conductivity meter (Geonics EM-31Mk2) and resistivity Lund Imaging System were
carried out and soils samples were taken for laboratory tests in fall 2007.
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