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Near Surface 2005 - 11th European Meeting of Environmental and Engineering Geophysics
- Conference date: 04 Sep 2005 - 07 Sep 2005
- Location: Palermo, Italy
- Published: 04 September 2005
101 - 150 of 180 results
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Cavity Detection Using Seismic Refraction Tomography – Can it Be Done?
Authors J. Sheehan, W. Doll, W. Mandell and D. WatsonC004 CAVITY DETECTION USING SEISMIC REFRACTION TOMOGRAPHY: CAN IT BE DONE? J. SHEEHAN 1 W. DOLL 1 W. MANDELL 2 D. WATSON 3 Abstract 1 1 Battelle 105 Mitchell Rd Suite 103 Oak Ridge TN 37830 USA 2 US Army Environmental Center 3 Oak Ridge National Laboratory We are using synthetic models and field data to evaluate the performance of seismic refraction tomography codes for cavity detection. Two-dimensional models have been created and used to generate synthetic travel-time data for tomography analysis. The results of this analysis suggest that the presence of a cavity can sometimes be determined but the
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Characterization of Oil Pollution by Spectral Induced Polarization (SIP)
Authors R.P. Bhandari, E. Niesner and N. SchleiferP001 Characterization of oil pollution by spectral induced polarization (SIP) Summary: 1 Oil pollution due to leakage from an underground supply network has been characterized using spectral induced polarization (SIP) imaging. Profiles at two different locations (contaminated and uncontaminated) have been imaged with different frequencies. The profile at the contaminated site clearly showed the phase and the resistivity highs at the contaminated horizon. The image of the phase highs was found best at a frequency of 3 Hz. Similarly the model obtained in the uncontaminated area (?) found a possible spot of contamination by the phase angle inversion whereas it
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Detection of Hydrocarbon Contamination in the Ground Using GPR Method
Authors H. Marcak, T. Golebiowski and S. Tomecka-SuchonP002 Z-02 Detection of hydrocarbon contamination in the ground using GPR method The WARR profiling gave the mean velocity of the ground as 0 095 m/ns. Near Near Surface Surface 2005 2005 — — Palermo Italy Italy 5 4 - 8 - 7 September 2005 2005 1 Introduction With today’s common and intensive use of hydrocarbon products the risk of contamination of the ground with such liquids is major environmental problem. Hydrocarbon contamination (hc) can be divided into Light Non-Aqueous Phase Liquid (LNAPL) and Dense Non-Aqueous Phase Liquid (DNAPL). The first of them has been analysed in this paper. There
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A Geophysical Survey to Characterize an Industrial Waste Gypsum Deposit
Authors M. Senos Matias and E. RamalhoP003 A geophysical survey to characterize an industrial waste gypsum deposit Summary 1 Phosphoric acid production lead to the deposition of a large quantity of phosphogypsum forming a hill about 25 metres high and with an overall area over 7ha. In the past a large quantity of acid mud was buried in this hill in an insulated coffin. Now it is intended to use the phosphogypsum in the cement industry. Therefore a geophysical survey was planned to locate the acid mud to check for the hill geometry homogeneity and for its radiometric levels. Following this survey several boreholes were drilled
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GPR Application for Estimation of Ground Contamination Degree Caused by Oil Leakage
Authors A.An. Dolgiy, A.Al. Dolgiy, V. Markulis and V. ZolotarevP004 GPR APPLICATION FOR ESTIMATION OF GROUND CONTAMINATION DEGREE CAUSED BY OIL LEAKAGE Summary 1 In this paper practical results of the long-term (1999-2004) application of Ground Penetrating Radar (GPR) technique for estimation of the electrical parameters of contaminated ground are presented. Contamination was caused by leakage from oil product pipeline. GPR technique includes a procedure of GPR profiling and application of Common-Midpoint (CMP) method. As a result of GPR profiles processing there were acquires values of thickness of ground layers and their relative dielectric permittivity. These values were connected with the degree of ground contamination which was attested by
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Geoelectrical Monitoring of the Bioremediation of Hydrocarbons Contaminated Soils
Authors R. Dubiel, B. Zogala, W.M. Zuberek, K. Wzientek and M. Rusin-ZogalaP005 GEOELECTRICAL MONITORING OF THE BIOREMEDIATION OF HYDROCARBONS CONTAMINATED SOILS Abstract Bogdan Zogala Ryszard Dubiel Waclaw M. Zuberek Krystian Wzientek Monika Rusin-Zogala University of Silesia Faculty of Earth Sciences 60 Bedzinska Str. 41-200 Sosnowiec Poland The paper presents the results of geoelectrical monitoring of the bioremediation of hydrocarbons contaminated soils. Yeast strain Yarrowia lipolytica A-101 suspension was introduced into one of hydrocarbons contaminated zones situated in fuel base of the former military firing ground Borne Sulinowo. The process of bioremediation was controlled using cyclical electromagnetic and resistivity imaging measurements. The increase in soil electrical conductivity and decrease in electrical resistivity
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Using Induced Polarisation to Identify Elevated Concentrations of Metals in Soils from Point Sources
Authors R. Brosky-Dorsey, A. Viezzoli and J. CullSummary Metal concentrations’ data for surface soils contaminated with zinc were compared with conductivity and chargeability data. All but one site had soil zinc concentrations 15 to 40 times higher within one metre of the contaminant source than at 50 metres (Table 1). Induced Polarisation (IP) data collected at these sites confirmed the inversely proportional relationship of soil zinc concentration with distance from the source. Introduction Electrical transmission towers constructed from steel and galvanized with a zinc protective layer release substantial zinc into the surface soil around the tower as environmental forces cause leaching of the zinc coating (Jones and
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Airborne Geophysical Study around Hydrometallurgical Plant Area in Kara-Balta, Kyrgyzstan
Authors T. Valjus, I. Suppala and H. VanhalaP007 AIRBORNE GEOPHYSICAL STUDY AROUND HYDROMETALLURGICAL PLANT AREA IN KARA-BALTA KYRGYZSTAN Abstract 1 We present results of the use of high-resolution airborne geophysics for mapping geological structures and assessing environmental impacts of a hydro-metallurgical plant area in Kara-Balta Northern Kyrgyzstan. The Kara-Balta hydro-metallurgical industry processes uranium and gold ores and waste material from color-metal industry. Airborne magnetic radiometric and electromagnetic (EM) data were acquired in 2004 over a large area 821 square kilometers using 200 meters line spacing and 30 meters nominal flight altitude. General view of the airborne magnetic map originates from the basement below the sediments. Radiation level
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The Resistivity Imaging Survey of the Chemical Waste Dumping Site
Authors R. Dubiel, K. Wzientek, B. Zogala, W.M. Zuberek and M. Rusin-ZogalaP008 THE RESISTIVITY IMAGING SURVEY OF THE CHEMICAL WASTE DUMPING SITE Abstract Krystian Wzientek Bogdan Zogala Waclaw M. Zuberek Ryszard Dubiel Monika Rusin-Zogala University of Silesia Faculty of Earth Sciences 60 Bedzinska Str. 41-200 Sosnowiec Poland The results of resistivity imaging survey of the chemical waste dumping site in Tarnowskie Gory are presented. Chemical wastes were stored in the area of the chemical plant and its surroundings for many years. Toxic elements migrated with surface water into the Quaternary and Triassic aquifers. The contaminated zone was determined using resistivity imaging survey with ABEM Lund Imaging System. The obtained resistivity cross
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3D Resistivity Imaging on a Waste Site
Authors A. Seiler, L. Marescot and D. ChapellierP009 3D RESISTIVITY IMAGING ON A WASTE SITE 1. Introduction 1 Polluted sites are of great concern in Switzerland; The Swiss Agency for the Environment takes an inventory of more than 50’000 polluted sites. Non-invasive geophysical techniques are therefore of prime importance to specify the subsurface geometry and content of waste sites. Resistivity imaging techniques are increasingly used for subsurface characterisation due to low equipment cost rapidity of processing and ease of use. In engineering and environmental problems resistivity surveys can be applied to characterizing waste dumps or contaminant plumes (e.g. Chambers et al. 2002). These surveys are ever more
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Modelling the Effects of Subsurface Heterogeneity on Ground Penetrating Radar Signals
Authors A. Giannopoulos and N. DiamantiP010 MODELLING THE EFFECTS OF SUBSURFACE HETEROGENEITY ON GROUND PENETRATING RADAR SIGNALS Introduction 1 In most GPR modelling studies stratigraphical units are modelled as homogeneous layers. However heterogeneity in the Earth’s subsurface can be a major source of variability in the observed GPR signals. GPR images are expected to vary significantly with the state for example of water or more generally of liquid saturation (Kitterød and Finsterle 2002). This was suggested in modelling studies where the occurrence of reflections in a GPR image was dependent on a heterogeneous distribution of pore water (Nguyen 1999; Kowalsky et al. 2001). It can
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Modelling Techniques for Flow and Dispersion Characteristics Predictions in Urban Areas
Authors S. Di Sabatino, E. Solazzo and R. BritterP011 Modelling Techniques for Flow and Dispersion Characteristics Prediction in Urban Areas Abstract 1 In this paper we present some numerical modelling techniques devoted to the prediction of flow and dispersion characteristics in urban areas at three different spatial scales. These are: the city scale the neighbourhood scale and the street (canyon) scale. Particular attention is given to the treatment of flow and temperature distribution within the urban area. Both a simple integral model and more complex Computational Fluid Dynamics (CFD) model are used. It is shown that the first model is suitable for the prediction of urban heat fluxes
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Sensibility Analysis of Electrical Imaging Method for Mapping Aquifer Vulnerability to Pollutants
Authors A. Casas, M. Himi and J.C. TapiasP012 SENSIBILITY ANALYSIS OF ELECTRICAL IMAGING METHOD FOR MAPPING AQUIFER VULNERABILITY TO POLLUTANTS 1 ALBERT CASAS 1 MAHJOUB HIMI 1 AND JOSEFINA C. TAPIAS 2 1) Departament de Geoquímica Petrologia i Prospecció Geològica. Facultat de Geologia. Universitat de Barcelona. c/. Martí i Franquès s/n. 08028-Barcelona. ([email protected]) 2) Departament de Productes Naturals Biologia Vegetal i Edafologia. Facultat de Farmàcia. Universitat de Barcelona. Avda. Joan XXIII s/n. 08028-Barcelona. ([email protected] Abstract Groundwater is becoming more and more a strategic resource and for this reason there is an increasing demand for vulnerability maps which illustrate the exposure of aquifers against pollution. These maps are
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The Decision of a Return Linear Problem Gravitational Investigation at West Krivoy Rog
Authors P.A. Minenko and R.V. MinenkoP013 The Decision of a Return Linear Problem Gravitational Investigation at West Krivoy Rog 1 Abstract It is established that for various models at the same accuracy of the gravitational investigation shootings the correct model of a return linear problem of gravitational investigation (RLPG) allows to receive exact steady and geological substantial decision and the incorrect model gives unstable and vapid the decision. The class of models RLPG providing practical suitability known including developed author is found methods and criteria of the decision of linear-nonlinear problems and directions of the further researches are determined.The practice examples are given. Introduction.The return
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3-D Gravity Inversion with Euler Deconvolution as a Priori Information
Authors H. Rim, Y.-S. Park, M. Lim, S.B. Koo and B.D. KwonP014 Z-99 3-D GRAVITY INVERSION WITH EULER DECONVOLUTION AS A PRIORI INFORMATION Summary 1 HYOUNGREA RIM 1 YEONG-SUE PARK 1 MUTAEK LIM 1 SUNG BON KOO 1 AND BYUNG DOO KWON 2 1 Korea Institute of Geoscience and Mineral Resources 30 Gajeong-Dong Yuseong-Gu Daejeon 305-350 KOREA 2 Department of Earth Sciences Education Seoul National University San 56-1 Sillim-dong Gwanak-gu Seoul 151-742 KOREA We propose a 3D gravity inversion scheme utilizing Euler deconvolution as a priori information. The essential point of the scheme is to reduce the nonuniqueness of the solution by restricting inversion space with help of Euler deconvolution. It
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A New Approach for Detection of the Geological Features Ahead of the Tunnel During Excavation
Authors S.S. Seren and A. Eder-HinterleitnerP015 A New Approach for Detection of the Geological Features Ahead of the Tunnel During Excavation Abstract 1 During the construction of the tunnel the knowledge about the geological and geotechnical features is very important. The civil Engineer must adapt the construction method and resources to the geological conditions. This guarantees the safety and low costs during tunnelling. Seismic is the most suitable method to detect the soil and rock mass conditions ahead of the tunnel excavation. Because seismic parameters and responses correlate directly to geological and geotechnical features. The new 3D Seismic Survey in the Tunnel (3D-SST) allows to
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Geophysical Investigations of Soil Stabilization Quality on the Metro Unit Underground Construction in Kyiv
Authors N.A. Yakymchuk, S.P. Levashov, I.N. Korchagin, N.G. Dravert and J.N. YakymchukP016 Geophysical Investigations of Soil Stabilization Quality on the Metro Unit underground Construction in Kyiv 1 S.P. LEVASHOV 1 2 N.A. YAKYMCHUK 1 2 I.N. KORCHAGIN 3 N.G. DRAVERT 2 JU.N. YAKYMCHUK 2 1 Institute of applied problems of Ecology Geophysics and Geochemistry Laboratory lane 1 Kyiv 01133 Ukraine 2 Management and Marketing Center of Institute of Geological Science e-mail: [email protected] [email protected] 3 Institute of Geophysics of Ukraine National Academy of Science e-mail: [email protected] Abstract. Results of diagnosis of the hermetic scaling zone of tunnels at the depth of 15-20 m from the surface are presented. Geophysical investigations were conducted
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Evaluation of Peat Layer Using Geoelectrical Methods at Nile Delta– Egypt
Authors M. Metwaly, G. El-Qady, A. El-Galladi and K. UshijimaP017 Evaluation of Peat layer using geoelectrical methods at Nile Delta Egypt. Gad El-Qady 1 3 Mohamed Metwaly 1 Ahmed El-Galladi 2 and Keisuke Ushijima 3 Abstract 1 A peat layer has been encountered in the subsurface Holocene sediments of eastern part of the Nile delta at depth ranging from 5 to 13 meters and the maximum thickness of 3m. This study aims to investigate the credibility of the available surface geophysical tools in detecting the vertical and lateral extensions of peat layer at two locations in Mansoura city where a considerable thickness of peat is recorded by borings. The
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Estimating the Composition of an Heterogeneous Soil Containing Stony Inclusions Using Both Seismical and Electrical Measurements
Authors D. Jongmans, E. Rey, P. Gotteland and S. GaramboisP018 Estimating the composition of an heterogeneous soil containing stony inclusions using both seismical and electrical measurements E. REY D. JONGMANS P. GOTTELAND S; GARAMBOIS Abstract Introduction 1 Grenoble Univertsity Maison des Géosciences L.I.RI.G.M. BP 53X 38041 Grenoble Cedex 9 France Common geotechnical in-situ tests are generally unable to characterise coarse heterogeneous soils (scree-slopes tills alluvial fans debris flows or slope deposits) once they contain pebbles or rocks with size larger than 100 to 150 mm. For such materials geophysical methods which are non-intrusive and able to investigate a large volume of soil allow the characterisation of coarse formations as
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MASW Measurements for Soil Classification in Dinar, Turkey
Authors P. Tildy, L. Hermann, A.I. Kanli, B. Neducza, A. Pinar and Z.S. PrónayP019 MASW measurements for soil classification in Dinar Turkey Abstract 1 Elastic properties of near-surface materials and their effects on seismic wave propagation are very important in earthquake and civil engineering. Shear-wave velocity is an important parameter for evaluating the dynamic behaviour of soil in the shallow subsurface. The average shear-wave velocity for the top 30 m of soil is referred to as VS 30 were accepted by the Uniform Building Code (UBC) and Eurocode 8 (EC8) codes to classify sites according to type of soil. Surface wave seismic measurements were carried out at 50 locations mostly in Dinar city
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DC Apparent Resistivity Evaluation on 3D Structures – A Numerical Geometric Factor Approach
Authors L. Marescot, S. Rigobert, S. Palma Lopes, R. Lagabrielle and D. ChapellierP020 DC APPARENT RESISTIVITY EVALUATION ON 3D STRUCTURES: A NUMERICAL GEOMETRIC FACTOR APPROACH Summary 1 This paper presents a numerical evaluation of the geometric factors used for the computation of apparent resistivities in the context of non-destructive or petrophysical investigations in laboratory or in the field when no inversion can be carried out. Apparent resistivities are evaluated using a numerical geometric factor calculated using a finite element algorithm. An example illustrates the simulation of a resistivity survey on a water tank. Topographic artefacts and effects of material sample shapes are successfully removed and reliable apparent resistivity images of the structures
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Research of Technical State of Pipelines by Anomalous Magnetic Field Measurements
Authors V.O. Nekuchaev, E.V. Albanova and E.I. KrapivskyP021 RESEARCH OF TECHNICAL STATE OF PIPELINES BY ANOMALOUS MAGNETIC FIELD MEASUREMENTS 1 E.V. ALBANOVA E.I. KRAPIVSKY V.O. NEKUCHAEV Ukhta State Technical university 169 300 Komi Republic Ukhta Pervomayskasya 13 Russia Summary This work is devoted to the solution of quite an actual problem – working out and application of economical remote geophysical methods of the inspection of technical state of underground main pipelines. The possibilities and methodics of magnetic methods based on measurements of three components X Y Z of constant magnetic field as well as its gradients are investigated in the report. Introduction In Russia the total length
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Locating and Imaging Mineshafts Using Surface and Cross-Borehole Geoelectrical Tomography
Authors J.E. Chambers, P.B. Wilkinson, P.I. Meldrum, R.D. Ogilvy and S. CauntP022 LOCATING AND IMAGING MINESHAFTS USING SURFACE AND CROSS-BOREHOLE GEOELECTRICAL TOMOGRAPHY Abstract 1 Many urban and rural environments in the UK are affected by the legacy of mining which encompasses activities stretching back over hundreds of years. In particular hidden and abandoned mineshafts and entries can potentially cause serious risks to health and safety and can have a detrimental influence on property values in affected areas. In this paper we present results of part of a commissioned study for the Coal Authority (CA) into the use of minimally invasive geophysical techniques for locating and imaging hidden mineshafts. We tested two
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GPR Estimation for Diameter of Buried Pipes
Authors A.An. Dolgiy, A.Al. Dolgiy and V. ZolotarevP023 GPR ESTIMATION FOR DIAMETER OF BURIED PIPES ANATOLY DOLGIY 1 ANDREY DOLGIY 2 VLADIMIR ZOLOTAREV 3 Summary 1 Ground Penetrating Radar (GPR) was used to estimate the diameter of buried metal pipes. The GPR acquisition system used for obtaining profiles of 7 pipes was a Radar Systems Zond-12c with shielded antenna of frequency 900 MHz. The buried pipes from 0.02 m up to 0.72 m in diameter were studied. GPR data processing was based on the method of direct least square fitting of ellipses. Average error of diameter estimation was 14% except the pipe of 0.02 m in diameter
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Recognition of Karst Structure Using Refraction Tomography
Authors Z. Pilecki, M. Szczepanska, J. Klosinski and E. PileckaP024 RECOGNITION OF KARST STRUCTURE USING REFRACTION TOMOGRAPHY Abstract 1 The results of location of karst wells and probable hydraulic connections between them in limestone massif using the refraction tomography are presented. Seismic modeling was based on refraction horizon recognition in the first stage and tomographic processing of P-wave and S-wave velocity changes in the second one. The studies were carried out on the terrain neighboring to the wall of abandoned quarry. The results of tomography were correlated with karst forms observed on the quarry’s wall. The studies showed the sufficient usability of refraction tomography for recognition of karst forms
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Microgravimetric Investigations for Shallow Depth Cavity Detection
More LessP025 Microgravimetric investigations for shallow depth cavity detection Abstract 1 Microgravimetric measurements have been conducted in the suburban territory of Budapest Hungary in order to map a shallow (~15 m deep) extensive subsurface cavity system. The site of study is the public park Ohegy an earlier recultivated limestone quarry terrain where collapse of cavities occurred. A high-precision survey was carried out by the Eotvos Lorand Geophysical Institute consisted of 1700 gravity stations with small station distance (2 and 3 m). As the spatial wavelengths of the small size targets are much shorter than that of the regional field and the
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Pipes Detection Using VLF Method
By N. AminiP026 Pipes Detection Using VLF Method Abstract 1 EM methods are one of most important methods in conductors prospecting. In this research the application of VLF method has been studied in order to find metallic pipes. VLF data was acquired by WADI instrument (ABEM Co.) and then raw data was interpreted using a new version of Karoos & Hjelt (1983) filter which was proposed by the author (Amini 2004). Introduction Although VLF method principles are very evident for experts but a fast review can be helpful. The VLF signal sender antenna is a long vertical wire that a large AC
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Geophysical and Geotechnical Studies to Stand behind the Damage Potential in 15th May City, Cairo, Egypt
More LessP027 Z-99 Geophysical and geotechnical studies to stand Abstract 1 behind the damage potential in 15th May city Cairo Egypt. T. ABDEL-HAFEZ NATIONAL RESEARCH INSTITUTE OF ASTRONOMY AND GEOPHYSICS 11722 HELWAN CAIRO EGYPT. 15th May City is a new urban which has been developed over 25 years in Eocene sediments south of Cairo. After a period of time some of the buildings are being found cracked. Geoelectric study shows existence of clay beds while scanning electron microscopy (SEM) and Energy dispersive system (EDS) of some selected rock samples show that the rocks have pores in their internal structure and are
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Seismic Measurements to Characterize Granite
Authors Z. Prónay, E. Törös and B. NeduczaP029 Seismic measurements to characterize granite Introduction 1 The seismic measurements were connected to the project to select a final underground repository for the Low and Intermediate level radioactive waste at Bátaapáti (Üveghuta) site in Hungary. The candidate site was selected after a nation wide screening and were proposed for the detailed investigation. This hillside area is 300 x 600 m 2 composed of Low Carboniferous age granite and the overburden is quarterniary loess. Different geophysical and hydrogeological type of investigation was carried out mapping the geological structure. The paper focuses the methodology and result of P S-reflection and seismic
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Development of Electrical Resistivity Vibration Penetration Test (ER-VPT)
Authors M. Jinguuji and S. ToprakP030 DEVELOPMENT OF ELECTRICAL RESISTIVITY VIBRATION PENETRATION TEST (ER-VPT) Abstract 1 The estimation of liquefiable soils and potential mapping of liquefaction are very important for city planners building owners and engineers to see liquefaction prone areas and hazard levels. If the proposed structure is in a liquefaction hazard zone additional measures against liquefaction can be taken. We propose a new method electrical resistivity vibration probe penetration test (ER-VPT) which utilizes a vibration probe accelerometer pore-pressure meter and electrical resistivity measurement to determine the liquefiable soils. We did experiments in laboratory and field using ER-VPT and got successful results. The ER-VPT
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Groundwater Resources Assessment Using Audiomagnetotelluric and Seismic Data – The Fluvial Deltaic Tordera Aquifer Unit (NE Spain)
Authors E. Falgàs, J. Ledo, T. Teixido, B. Benjumea, A. Marcuello, P. Queralt, F. Ribera and C. ArangoP032 T-05 Groundwater resources assessment using audiomagnetotelluric and seismic data: the fluvial deltaic Tordera aquifer unit (NE Spain) INTRODUCTION 1 E. FALGÀS 1 J. LEDO 1 T. TEIXIDÓ 2 B. BENJUMEA 1 A. MARCUELLO 1 P. QUERALT 1 F. RIBERA 3 C. ARANGO 1 Deltaic aquifer systems are complex and their geological and hydrogeological characterization is a difficult task when only scattered information is available. In order to complement this information and to obtain a more accurate image of the physical properties of these systems the use of surface geophysical methods has increased during the last years (Schwinn and Tezkan
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Application of Electrical Resistivity Tomography on Glaciers and Rock-Glaciers in the Western Alps
Authors M. Marchisio, A. Bianchi, X. Bodin, P. Ciuffi, L. D‘Onofrio, D. Fabre, M. Pappalardo, A. Ribolini, S. Sartini and P. SchoneichP033 APPLICATION OF ELECTRICAL RESISTIVITY TOMOGRAPHY ON GLACIERS AND ROCK- GLACIERS IN THE WESTERN ALPS M.Marchisio 1 A. Bianchi 3 X. Bodin 4 P. Ciuffi 3 L. D’Onofrio 1 D. Fabre 5 M. Pappalardo 2 A. Ribolini 2 S. Sartini 3 P. Schoneich 6 1 SUMMARY In order to investigate the nature of buried ice/permafrost lenses in the proglacial area on western Alps glaciers (Italy and France) high resolution geoelectrical tomographies were carried out in several sites both located in the north facing slope of the main alpine ridge. The glacial and periglacial landforms occurring in mountain environments can be
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Mobile Instrument for NMR Measurements on Samples in the Earth’s Magnetic Field
By T. RadicP034 Z-99 MOBILE INSTRUMENT FOR NMR MEASURE- Introduction 1 MENTS ON SAMPLES IN THE EARTH’S MAGNETIC FIELD TINO RADI� Radic Research Zehntwerderweg 188A 13469 Berlin Germany E-mail: [email protected] Web: www.radic-research.de The Nuclear Magnetic Resonance (NMR) method (Abragam 1983) allows beside other parameters a non-destructive measurement of the water content and the pore radii distribution of a rock sample. Therefore it is not surprising that the NMR method has developed into an important geophysical instrument. But up to now the main application area is still the laboratory. Unfortunately samples show many unwanted modifications on their way from the field to the
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Buried Valleys in the North Sea Region – New Investigations in the Project BurVal
Authors H. Wiederhold, H.-M. Rumpel and the Burval Working GroupP035 Buried valleys in the North Sea region: New investigations in the project BurVal Introduction 1 Buried valleys are deep glacial erosion structures with depth down to more than 500 m and length of up to 100 km. They occur in southern Scandinavia Poland and the Baltic States Northern Germany the Netherlands and the eastern part of the UK. The increasing importance of the buried valleys for the water supply makes systematical hydrogeological and geophysical investigations necessary to enable a water management in a sustainable and balanced way. Basically buried valleys influence – depending on their sedimentary filling – the
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Constraints in Hydrgeophysical 2D Resistivity Imaging. Case History – Kappelen Test Site
Authors L. Marescot, Y. Hacini and D. ChapellierP036 Constraints in hydrgeophysical 2D resistivity imaging. Case history: Kappelen test site 1 Introduction 2D electric tomography is largely used in hydrogeophysical studies. This method gives a 2D model of the true or calculated resisitivity distribution. The Res2Dinv software (Loke & Barker 1996) is frequently used for resistivity data inversion. However the inversion result is not unique for various reasons. The result with the lowest error does frequently not correspond to a geological reality. A priori information coming from borehole data other geophysics measurements or geological observations can be introduced into the inversion process so that the results reflects reality.
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On the Use of SP and ERT Data to Build a Simple Model of Near-Surface Flow
Authors M. Béhaegel, P. Sailhac, G. Marquis, E. Falgas and J. LedoP037 ON THE USE OF SP AND ERT DATA TO BUILD A SIMPLE MODEL OF NEAR-SURFACE FLOW M. BEHAEGEL 1 P. SAILHAC 1 G. MARQUIS 1 E. FALGAS 2 and J. LEDO 2 1 1 EOST – CNRS UMR 7516 5 rue René Descartes 67084 Strasbourg Cedex France [email protected] 2 Universitat de Barcelona. Dept. Geodinamica I Geofísica. C/Martí i Franques s/n 08028 Barcelona. [email protected] INTRODUCTION The Self-Potential (SP) method is one of the hydrogeophysical methods that provides information concerning underground water flow. Indeed hydraulic currents generate underground electrical currents (tens of mV) through electrokinetic coupling. Following SP time variations allows
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Aquifer Imaging Using CSAMT and ERT
Authors E. Falgàs, G. Marquis, P. Sailhac, J. Ledo, P. Queralt and M. BéhaegelP038 T-05 Aquifer imaging using CSAMT and ERT Introduction 1 Three-dimensional characterization of near-surface aquifer systems is an important challenge for our community not only for their use as water resources but also for their use for waste disposal. This task requires methods with high precision and resolution at different scales (from 10 0 to 10 4 m). A new discipline known as hydrogeophysics is being developed by several research groups all over the world (Hubbard and Rubin 2002). New advances on the characterization of near-surface areas have taken advantage of the diversity of information that can be obtained using
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An Investigation of Saline Water Distribution in a Coastal Plain by Various Electromagetic Methods
Authors Y. Mitsuhata, T. Uchida, K. Matsuo, A. Marui and K. KusonoseP039 AN INVESTIGATION OF SALINE WATER DISTRIBUTION IN A COASTAL PLAIN BY VARIOUS ELECTROMAGNETIC MEHODS Summary 1 Three different-scale electromagnetic measurements have been performed in the Kujyukuri coastal plain southeast Japan to understand the distribution of saline groundwater. The resultant resistivity sections estimated from three data sets independently were very consistent with each other. Two extremely conductive zones were revealed. One is deep and the other is shallow. The deep conductive zone is caused by the presence of brine water trapped into the Kazusa group composed of thick marine sediments. The shore-side portion of shallow conductive zone seems to be
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Test Site for Aquifer Cross-Hole Investigation for Hydrogeological Purposes
Authors A. Canto, E. Bena, G. Cassiani, G. De Bacco, A. Godio and C. StrobbiaP040 Test site for aquifer cross-hole investigation for hydrogeological purposes Summary 1 A test site for hydrogeophysical purposes has been designed; integrated geophysical investigation from boreholes and surface permitted to estimate with good accuracy the main geological features up to 25 meter in depth. Four boreholes were drilled in the area and prepared for cross-hole geophysical tomography. We discuss the monitoring by means of time lapse 2D electrical resistivity tomography of a salt water injection. Introduction We describe the preliminary results of a long-term project which aim is to evaluate the feasibility and efficacy of geophysical techniques for the geological
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Example of Integrated Geophysical Surveys to Characterize the Shallow Subsurface
Authors A. Bratus, F. Accaino, L. Baradello, D. Nieto Yabar and U. TinivellaP041 Example of integrated geophysical surveys to characterize the shallow subsurface Abstract 1 Several integrated geophysical surveys are performed by OGS in different sites located in the Friuli Venezia-Giulia region (North-East of Italy) to characterise the near surface subsoil for seismological applications. For this purpose we used seismic geoelectric and ground penetrating radar (GPR) methods. The first meters are described in details by GPR measurements the fifty meters by electric data and the layers until the basement are illuminated by seismic surveys. The results obtained at different resolution are in very good agreement and the direct measurements (downhole and cross-hole
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Determination of Spatial Electrical Resistivity Distribution from CPT Survey Data
Authors C. Hegymegi, Z. Nyári, J. Stickel, I. Fejes and A. TillmannP042 Z-99 Determination of spatial electrical resistivity distribution from CPT survey data Abstract 1 C. HEGYMEGI 1 Z. NYÁRI 1 J. STICKEL 2 I. FEJES 1 A. TILLMANN 3 1 Eötvös Lorand Geophysical Institute 17-23 Columbus Budapest H-1145 Hungary 2 ELGOSCAR 2000 Ltd.17-23 Columbus Budapest H-1145 Hungary 3 Institute for Chemistry and Dynamics of the Geosphere (ICG-IV) Forschungszentrum Jülich Jülich Germany The vulnerability of the groundwater against contamination is determined mainly by the geological structure of the aquifer and the flow conditions (pressure temperature etc.). The spatial distribution of the electrical resistivity provides useful information for investigating and modeling fluid
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Dip-Dependent GPR Image Decomposition by Local Radon Transforms
Authors U. Theune and M.D. SacchiP043 Dip-dependent GPR image decomposition by Local Radon Transforms Summary 1 GPR is a powerful tool for geophysical near-surface investigations. It is capable of delivering a highresolution image of the subsurface structure. However if the underground consists of many reflecting events the analysis and interpretation of the data can be very complicated. In this paper we report on a new image decomposition technique that is based on local Radon transforms. This technique is a parametric method that allows us to decompose and reconstruct a GPR data set depending on selected dips in the data. After partially reconstruction the data with
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Analysis of TDR and GPR Velocities and Amplitudes at Various Electrical Conductivities
Authors J. Schmalholz, J. Igel and U. YaramanciP044 Z-99 Analysis of TDR and GPR velocities and amplitudes at various electrical conductivities Introduction 1 Near Surface 2005 — Palermo Italy 4 - 7 September 2005 J. SCHMALHOLZ 1 J. IGEL 2 & U. YARAMANCI 1 1 Technical University of Berlin Dept. of Applied Geophysics ACK2 Ackerstr. 76 13355 Berlin Germany 2 Leibniz Institute for Applied Geosciences Stilleweg 2 30655 Hannover Germany Email: [email protected] Geophysical methods such as ground probing radar (GPR) receive more and more interest from different research fields since they offer good parametrical and local resolution combined with a non-invasive character. Therefore the geophysical devices are
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High-Resolution Geophysical Surveying at the Springfield Fault, New Zealand
Authors H. Horstmeyer, P. Corboz, J. Tronicke, D. Norbes, J. Campbell and A.G. GreenP045 High-resolution geophysical surveying at the Springfield Fault New Zealand Abstract 1 To trace the active Springfield Fault (South Island New Zealand) and map its character at shallow depths on a terrace where it exhibits no surface expression we recorded 3-D georadar data across an approximately rectangular 110 x 40 m survey area. In addition we carried out multi-electrode geoelectric measurements along a 198 m long profile that crossed the georadar survey area. Although the georadar depth penetration was limited to only ~5 m the processed images revealed the presence of a prominent reflecting horizon disrupted by three main discontinuities.
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Express-Technology of Geoelectric and Seismic-Accoustic Investigations in Ecology – Geophysics and Civil Engineering
Authors N.A. Yakymchuk, S.P. Levashov, I.N. Korchagin and J.M. PyschaniyP046 EXPRESS-TECHNOLOGY OF GEOELECTRIC AND SEISMIC-ACOUSTIC INVESTIGATIONS IN ECOLOGY GEOPHYSICS AND CIVIL ENGINEERING 1 Abstract. The components of express-technology for ecological geological-geophysical and civil engineering investigations are described. The technology includes the geoelectric and seismic-acoustic methods of geophysical investigations and also the apparatus and technical facility for telemetric investigations of the boreholes and emptiness. The developed equipments for the geophysical measurements are described. The results of this technology application show that it allows solving efficiently many practical problems. Introduction. The effective express-technology of ecological engineering-geological and geophysical investigations includes small-sized hardware of geophysical surveying algorithms and computer programs for the
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Geoelectric Investigation of a Multidirectional Fissure System in a Karstic Area
By S. SzalaiP047 GEOELECTRIC INVESTIGATION OF A MULTIDIRECTIONAL FISSURE SYSTEM IN A KARSTIC AREA SZALAI S. Abstract 1 Numerous publications are known about a direct geophysical investigation of unidirectional fissure systems but there have been no reports about the problem of multidirectional fissure systems. The few surface geophysical methods which could be potentially used for this purpose have numerous probably unresolvable difficulties. In this paper we present an attempt to map the multidirectional fissure system in a buried limestone surface by combining geoelectrical profiling and geoelectrical azimuthal measurements. Results received by using both the so-called null- and traditional arrays were interpreted together.
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The Potential of Time-Domain EM Sounding to Resolve the Presence of Faults or Fault Zones
Authors R.J. Sporry, K. Damtew Tessema and M. van der MeijdeP048 Abstract Near Near Near Surface Surface 2005 2005 2005 — — Palermo — Palermo Italy Italy 4 - 4 57 - September 7 8September September 2005 2005 1 To study the potential of Time-Domain EM Sounding in detecting faults and fault zones a reprocessing of data available from three different geological environments was carried out. Data was available from Lake Naivasha (Kenya) Moura (Portugal) and the Carboneras Fault Zone (Spain). All data was collected with a single coil TDEM instrument. To correlate the findings with other methods and techniques whenever possible use was made of aerial photographs Landsat TM
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First Data of a New Radiomagnetotelluric (RMT) Device and a New Inversion Approach
Authors G. von Gronefeld, B. Tezkan, E. Auken, A.V. Christiansen and Project TeamP049 FIRST DATA OF A NEW RADIOMAGNETOTELLURIC (RMT) DEVICE AND A NEW INVERSION APPROACH Summary 1 We present results of the European project “Development of the equipment and technologies of radiomagnetotellurics (RMT) for rapid pollution mapping and monitoring using foot car- and boat-borne survey”. A newly developed digital RMT instrument can record all four components of the impedance tensor in the frequency range from 10 kHz to 1 MHz. Measurements show that the device works stable and reliable and that the measurements are repeatable. As part of the software development in the project a 1D laterally constrained inversion (1D LCI)
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ERT Measurements on Tailings Dams Using Multi-Channel Spectral Induced Polarization (SIP)
Authors S. Kruschwitz and E. NiederleithingerP050 ERT Measurements on Tailings Dams using Multi-channel Spectral Induced Polarization (SIP) Abstract 1 Tailings dams pose major risks to human life and the environment. The often poor construction and low maintenance level has caused serious accidents in both developed and developing countries. The EC funded project TAILSAFE is aimed at the non-destructive assessment of tailings facilities for stabilization analyses and the development of better management methods. Geophysical methods namely electrical and acoustical methods are best qualified to investigate tailing dams non-destructively on a large scale. The focus in these field studies was on the discrimination of different layering and
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Three-Coil EMI Multi-Frequency Sounding Devices in Near-Surface Applications
Authors E.V. Balkov, M.I. Epov, A.K. Manstein and Y.A. MansteinP051 THREE-COIL EMI MULTI-FREQUENCY SOUNDING DEVICES IN NEAR-SURFACE APPLICATIONS Abstract 1 The paper is devoted to the brief application feasibility study of three-coils multifrequency sounding device its advantages in comparison to devices that have two-coils. Influence of initial phase determination error into secondary field measurement accuracy was assessed. The estimation results of penetration depth are presented under the following models: conductive layer with non-conductive bottom half-space and conductive layer in resistive half-space. The estimated depths were compared with depth conventionally calculated using skin-effect approach. Several cases studies are included to prove the usefulness of multi frequency approach. Introduction E.V. BALKOV
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