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9th EAGE/EEGS Meeting
- Conference date: 31 Aug 2003 - 04 Sep 2003
- Location: Prague, Czech Republic
- ISBN: 978-94-6282-116-3
- Published: 01 September 2003
81 - 100 of 180 results
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Joint application of high-resolution seismic and GPR measurements to monitor sludge deposition: Advances of the geowaters project
Authors T. Tóth, H. de Boom, B. James, I. Lemperger, S. Puszta, D. van der Roest, G. Sideris, G. Tsokas, K. Vrana and V. ZolotarevNew sediment layers accumulating on the floors of rivers, canals, lakes, and harbours in industrialised countries contain varying amounts of contarninants, which have been discharged from a range of activities, both legal and illegal. These contaminated sediments are known collectively as sludge and have been accumulating for decades. The identification of contamination in waterways has led to the realisation that there is a need to carry out surveys of the pollution, in many cases followed by remediation. Contaminated water floors, though probably created in the past, continue to disperse their pollutants in the water, thus creating a potential effect on the quality of drinking water and recreational water. Remediation work can only be carried out in a cost effective way if it is preceded by a site survey, which provides high resolution data. 95% of current site surveys are done by collecting hand drilled cores for examination and analysis. These point sources of data are then used to try to give an impression of the sludge layers, but the resolution is extremely poor. Contamination may be found, but the volumes cannot be exactly quantified.
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Two-dimensional geoelectrical imaging across a septic tank
More LessThe septic tank system is one of the most common, cheapest and most suitable means of sewage disposal in developing countries. The tank is constructed to store faeces and other solid materials, while the excess water is displaced into a seepage or soakaway pit. The soakaway pit is designed to permit the effluents to seep into the surrounding soil readily. In this paper, the use of numerical modellig and inversion of apparent resistivity data to simulate the environmental imapct of a septic tank (and the effluents emanating from it) on the environment is reported.
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Multi-receiver OhmMapper survey over a former fuel tank site
Authors L. Pellerin, D. Groom and J. JohnstonGeoelectric data were acquired with the OhmMapper TR4 (OM-TR4) at the Camp Parks Reserve Forces Training Area (RFTA) former tank farm to map the near subsurface resistivity and possible association with a 30 to 40 year old hydrocarbon plume and locate any additional pipelines and subsurface infrastructure
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A comparative study of different electric imaging configurations in investigation of a fresh-saline groundwater interface
By P. H. GiaoElectric imaging (EI) can be useful in solving various geotechnical-geoenvironmental problems. In this study, EI was applied to investigate a salinized soil ground in the NE Thailand for locating the interface between saline and fresh groundwater due to brine water pumping activity for salt production in the area. A manual electric imaging procedure was applied instead of using an automatic electric imaging with multi-cable and multi-electrode system. To enhance efficiency and production of the manual EI procedure, a comparative study was made on various configurations, i.e., dipole-dipole, pole-dipole, Wenner and Schlumberger. All of the arrays worked very well, but the Wemer configuration gave the best electric response with reference to a vertical interface of resistivity contrast, while the poledipole has the largest depth of investigation.
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Vertical radar profile monitoring of the vadose zone dynamics and oscillating water table
Authors G. Cassiani, L. Gallotti, V. Ventura and G. AndreottiThe identification of flow and transport characteristics in the vadose zone is a fundamental step towards understanding the dynamics of contaminated sites and the resulting risk of groundwater pollution.
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Geoelectrical investigations of a kerosene contaminated site at the Schwerin-Parchim airport
Authors M. Grinat, J. Sauer and W. SüdekumDuring the last years many publications dealt with geophysical methods aimed at locating and characterizing light non-aqueous phase liquids (LNAPL) in the subsurface showing the increasing relevante of this kind of contamination (e.g. ATEKWANA et al. 2000; ORLANDO 2002; SAUCK 2000).
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Comparison of different 3D geoelectric survey layouts for detection of saltwater convection cells in the Okavango Delta (Botswana) and determination of 3D effects in 2D surveys
Authors R. Supper, P. Bauer, W. Kinzelbach and S. ZimmermannThe Okavango Delta is a huge wetland ecosystem in northwestern Botswana, Southern Africa. Water from the moist tropical highlands of southern Angola flows down the Okavango river, spills into the Kalahari basin and forms an alluvial fan of the size of approximately 30 000 km2. Some 6000 km2 of permanent swamps form the core of the Delta and towards the fringes, the environment is gradually becoming drier. In this continuum h m wet to dry environments, a rich variety of flora and fauna has developed.
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Environmental radioactivity of natural and man-made sources in the Czech Republic
By M. MatolinNatural sources imply cosmic radiation, terrestrial radiation and natural radionuclides in water and air. Natural sources of radiation may be also concentrated in the environment by human activities. Examples of these are uranium mining, transport and deposition of U-ores and barren rock, uranium processing, coal mining, and the use of phospate and potassium fertilizers in agriculture. The use of man-made radioisotopes in industry, nuclear power plants and various man activities may result in their escape, transfer and deposition as nuclear fallout. Geophysical radiometric methods have the capacity of location, monitoring and assayss of these various bulk radiation sources in the environment and enable estimates of their radioactivity levels and their assessment.
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Integrated non-invasive characterization of waste disposal sites
Authors G. Dal Moro, M. Pipan, E. Forte, M. Sugan and I. FinettiNon-invasive characterization of waste disposal and contaminated sites provides large amounts of subsurface information at low cost and is a highly desirable approach for site management.
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Investigation of a waste landfill using electrical resistivity and induced polarisation tomography
Authors G. De Bacco, A. Godio and L. SambuelliElectrical Resistivity Tomography (ERT) and Induced Polarisation Tomography (IPT) were performed to investigate a municipal waste landfill located in the North of Italy. The object of the study is the oldest parcel of the landfill, where the waste disposal started in the early 70's and finished more than 20 years ago.
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Enlargement of cone penetration testing equipment with resistivity measurements: field measurements, case histories
Authors P. Draskovits, I. Fejes, B. Magyar and J. StickelIn former papers (Fejes, Jósa, 1990; Draskovits, Fejes, Magyar, Stickel, 1999 and 2000), measurement and geological-petrophysical interpretation of mechanical and nuclear parameters obtained with the help of the own-developped CPT equipment were introduced. In the present paper the possibility for measuring a following parameter, the resistivity will be shown.
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Well logging for checking the quality of reservoir dams and sealing walls
By M. ProcházkaThe spectrum of well logging activity expands from year to year and well logging is now used in a range of fields, where it was previously unknown. Significant improvement in quality was noted for well logging in the field of geological engineering and in the sphere of construction activity. With the use of modem techniques, new methods were developed and several of these methods are patented and only provided by our company.
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Borehole radar performance on fracture zone characterisation in crystalline bedrock
Authors E. Heikkinen, P. Saksa, T. Lehtimäki and P. HelläBorehole radar is, together with reflection seismic investigations one of scarce available methods for investigating the bedrock properties at further range than immediate borehole surroundings. In crystalline bedrock characterization project for disposal of the spent nuclear hel, the borehole radar measurements have been used mainly for investigation of orientation of the fracture zones and their extent from the borehole. Detailed and reliable information is required in this task. Radar method is relatively fast to be implemented and interpreted. Fractures and fracture zones, and their location, orientation, continuity and properties have been attempted to be assessed from the results. The bedrock properties that relate to radar reflections were assessed in detail by comparing reflections to other available borehole data. Comparison of data sets from different scales of observation has not been always a straightfonvard task. Better understanding of the radar method will allow more efficient use of the results.
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An approach to the electrical tomography aimed to the investigation of particular confined structures
Authors P. L. Cosentino, R. Martorana and V. SanfratelloIn this paper we present a practical approach to the electrical tomography when applied to materials having particular shapes (like the columns). Simple cylindrical shapes have been tested, and the general model has been selected as a set of elements having circular sections of some angle and thickness.
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Geophysical techniques for maritime archaeological surveys
Authors M. Lawrence, I. Oxley and R. BatesOver the last 10 years, the high-resolution marine geophysical survey field has witnessed significant advances in survey investigation equipment. New equipment is based on acoustic, optical, electrical and magnetic sensors however this paper will focus on the use of quantitative acoustic methods for the high resolution mapping of the seafloor for archaeological heritage management.
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3-D inversion of VES data from, Saqqara archaeological area, Egypt
Authors G. El-Qady, F. A. Monteiro Santos, A. Gh. Hassaneen and L. TrindadeSaqqara is one of the most important archaeological sites in Egypt. It is characterized by some of the oldest pyramids on the earth, ancient temples and a vast area of hidden archaeological remains.
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Diproved techniques of the micro-seismic tomography with S-waves for the non-destructuve testing on masonry structures
Authors M. Marchisio, L. D'Onofrio, A. De Falco, L. Frediani and F. GuidoniThe Geophysical Section of the Dipartimento di Ingegneria Civile of the University of Pisa has been active in researches on the application of non-pervasive geophysical surveys on the masonry structures of historical buildings for more than ten years.
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Laboratory determination of electric properties of ornamental stones in georadar high frequency band
Authors L. Sambuelli, P. Marini, R. Tascone, D. Vaccaneo and F. BrattaA new measurement system of dielectric permittivity and loss tangent of ornamental stones used for example on historical buildmgs has been developed Complex permittivity has been measured in the frequency range 1.1 - 1.7 GHz on samples chosen between marbles, sandstones and limestones. The values of dielectric parameters were measured experimentally by placing the sample in a resonant cavity obtained from a waveguide. The research has been developed to define a laboratoy testing method in order to improve GPR interpretation by creating a data base of electromagnetic properties of the analysed materials.
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