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Near Surface 2004 - 10th EAGE European Meeting of Environmental and Engineering Geophysics
- Conference date: 06 Sep 2004 - 09 Sep 2004
- Location: Utrecht, Netherlands
- Published: 06 September 2004
121 - 132 of 132 results
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Geoelectrics Estimating Changes in Water Saturation of the Vadose Zone
More LessP049 GEOELECTRICS ESTIMATING CHANGES IN WATER SATURATION OF THE VADOSE ZONE 1 S. MARES L. ZIMA J. DOHNAL Z. JANE AND J.KNEZ Charles University Department of Applied Geophysics Albertov 6 CZ-12843 Prague 2 Czech Republic Summary : Time-lapse multielectrode resistivity survey has been proved as appropriate tool for estimating the seasonal water saturation changes of the vadose zone in relatively homogeneous sandy sediments. Case history is taken from Creataceous of Bohemia. Introduction Vadose zone is a part of the soil or rock medium with pore space saturated only partially by water while the rest of the pore space is occupied
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Assessment of Water Retention of Agricultural Soils – Flood Prevention with Geophysics
Authors G. Kurz, M. Müller and U. YaramanciP050 ASSESSMENT OF WATER RETENTION OF AGRICULTURAL SOILS - FLOOD PREVENTION WITH GEOPHYSICS INTRODUCTION 1 G. KURZ M. MÜLLER and U. YARAMANCI Technical University Berlin Department of Applied Geophysics ACK 2 Ackerstr. 71-76 13355 Berlin Germany The knowledge of the soil water retention is the basis for developing flood protection concepts. The research goals are: Investigation of the water retention (storage) potential of agricultural soils examining the hydraulic conductivity and the non-invasive determination of the near-surface water content (down to 2 m). For flood preventation a decrease of the surface drain rate and therefore a decrease of the erosion should
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3-D Interpretation and Cement Fill Monitoring Using GPR over an Abandoned Gypsum Mine
Authors P. de Beukelaar, M. Meinster, G. Meyer, A. Saintenoy and E. SudriezP051 3-D INTERPRETATION AND CEMENT FILL MONITORING USING GPR OVER AN ABANDONED GYPSUM MINE Summary A Ground Penetrating Radar survey was carried out for cavity mapping and monitoring of the shallow subsurface conditions. The survey is located on a building site at the flank of the Mont- Valérien (larger western Paris suburb France) where an indoor tennis hall is under construction. Ancient gypsum mine galleries at 10-30 metres depth are a safety hazard in the shallow subsurface. Ground stabilisation is achieved by injecting cement in the cavities. Problem is to predict the outline of the cavities as grid drilling is
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Dual Interpretation for 2D Refraction Data
Authors H. Hashemi and M. Nabi-BidhendiP052 DUAL INTERPRETATION FOR 2D REFRACTION DATA Abstract 1 Interpretation of seismic refraction profiles is highly sensitive to velocity variations especially in the case of complex near surface areas. Most of the common methods are very lax toward these sharp shallow changes. A good consideration to formulas that are established by Palmer (1980) will result in more precise location and depth of near surface anomalies. In the new method which can be called “Dual Interpretation”; location and depths of a near surface anisotropy (Which is a water canal in this case) can be calculated from time-depth and depth contours respectively.
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The Bornheim (Germany) Test Site – Validation of 3 Different Techniques (ESAC, NASW, MASW) to Derive S-Wave Velocity Profiles
Authors M. Picozzi, S. Parolai, C. Milkereit, S.M. Richwalski, F. Baliva, D. Albarello, K. Roy-Chowdhury, H. Van der Meer and J. ZschauP053 THE BORNHEIM (GERMANY) TEST SITE – VALIDATION OF 3 DIFFERENT TECHNIQUES (ESAC NASW MASW) TO DERIVE S-WAVE VELOCITY PROFILES It is well known that the distribution of shear wave velocities in the sediments is a very important parameter for microzonation studies devoted to estimating possible amplification potential of the sedimentary cover (site effects). During recent years the estimation of shear wave velocities based on the analysis of surface waves have been widely improved in particular those using Rayleigh waves. Both active survey methods (MASW Park et al. 1999) based on the use of artificial seismic sources and passive ones
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Advanced Analysis of Self-Potential Data in Ore Deposits and Archaeological Sites
Authors L. Eppelbaum, B. Khesin, S. Itkis and Z. Ben-AvrahamP054 ADVANCED ANALYSIS OF SELF-POTENTIAL DATA IN ORE DEPOSITS AND ARCHAEOLOGICAL SITES Summary 1 Non-expensive and prompt self-potential (SP) measurements contain useful information about features of the geological structures in the areas under investigation. For eliminating the terrain relief effect (significantly distorting the observed SP field) was suggested to use a correlation technique developed earlier in magnetic prospecting. Essential similarities between magnetic and SP fields make it possible to apply to SP modifications of the rapid methods of characteristic points and tangents developed for magnetic prospecting. These methods are applicable to conditions of inclined relief arbitrary magnetization (polarization) and an
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Increased Water Containing Rocks Zones Searching and Mapping by Geoelectric Methods
Authors N.A. Yakymchuk, S.P. Levashov, I.N. Korchagin, J.M. Pyschaniy and J.N. YakymchukP055 INCREASED WATER CONTAINING ROCKS ZONES SEARCHING AND MAPPING BY GEOELECTRIC METHODS 1 S.P. LEVASHOV 1 N.A. YAKYMCHUK 1 I.N. KORCHAGIN 2 JU.M. PYSCHANIY 2 JU.N. YAKYMCHUK 3 1 Institute of applied problems of Ecology Geophysics and Geochemistry Laboratory lane 1 Kyiv 01133 Ukraine 2 Institute of Geophysics of Ukraine National Academy of Science 3 MMC Kyiv Ukraine Abstract. The results of using the geoelectric methods for the searching and contouring of the zones with increased water containing rocks are given. The received data show that the geoelectric methods allow to map water-containing areas and to define theirs bedding depths.
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Variation of Clay Resistivity with Moisture Loss
Authors R. Barker and E. RussellP056 VARIATION OF CLAY RESISTIVITY WITH MOISTURE LOSS Abstract 1 Time-lapse electrical imaging is a potentially useful technique in the investigation of building subsidence due to moisture loss in clay soils. However the electrical properties of clays are poorly understood. We have carried out experiments to monitor the change in resistivity with moisture content for a selection of seven British clays and two pure clays. The results demonstrate that most clays show very little change in resistivity until moisture content drops to a very low level (<15%). Introduction The occurrence of high concentrations of subsidence claims in wide areas of
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A New Model to Describe the Spectral Induced Polarization (SIP) of Sedimentary Rocks
By N. KlitzschP057 A NEW MODEL TO DESCRIBE THE SPECTRAL INDUCED POLARIZATION (SIP) OF SEDIMENTARY ROCKS Summary 1 The capillary network model (CNM) which describes the frequency dependent electrical resistivity of water saturated sedimentary rocks is introduced. The model enables us to calculate the spectral induced polarization (SIP) response from pore radius distributions and vice versa. Thus the model offers the possibility to obtain the pore radius distribution from SIP measurements. It seems to be possible to predict the hydraulic permeability using SIP measurements. Introduction Up to now the causes of the induced polarization (IP) of sedimentary rocks were mainly described qualitatively.
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About the Application of Electrical Conductivity in Precision Agriculture
Authors E. Lück and J. RühlmannP058 ABOUT THE APPLICATION OF ELECTRICAL CONDUCTIVITY IN PRECISION AGRICULTURE SUMMARY 1 The introduction of precision agriculture requires a teamwork of various branches. Modern agriculture is accompanied by soil sciences and by geophysics to be looking for information about the soil qualities. Especially the electrical and electromagnetic methods can deliver powerful tools for mapping large areas and for getting information about soil properties. In the last few years we received electrical conductivity (EC) maps of more than 2000 ha. This gave us the opportunity to compare electrical soil properties with agronomical used values. In addition we carried out laboratory studies
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A New Approach in the Detection of Salt Affected Soils; Integrating Surface and Sub-Surface Measurements
Authors J. Farifteh, A. Bouma and M. van der MeijdeP059 A NEW APPROACH IN THE DETECTION OF SALT AFFECTED SOILS; INTEGRATING SURFACE AND SUB-SURFACE MEASUREMENTS Abstract 1 The major problem regarding the process of salinization is that it is almost hidden at its inception and that under conditions where salt minerals have not severely affected the soils the process can often go undetected. Combining two salt identification methods using surface spectroscopy and sub-surface electromagnetic measurements results in a unique and new approach for salt detection in early stages of salinization. The lateral variation of the potential salt concentration derived from spectroscopy shows a large coherence with lateral variations in
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High Resolution GPR and Seismic Investigations – Interpretation through Modelling
Authors G.W. Tuckwell and N.J. CassidyP060 HIGH RESOLUTION GPR AND SEISMIC INVESTIGATIONS – INTERPRETATION THROUGH MODELLING Summary 1 The application of geophysical techniques in which energy is transmitted through the subsurface as waves is widespread and the applications of such techniques are numerous. Here we consider two such techniques Ground Penetrating Radar (GPR) and seismic refraction. Both of these techniques rely on the modification of the transmitted energy by variations in physical properties within the subsurface and the subsequent transmission of a portion of this energy to receivers at the surface. The interpretation of such data relies on the experience of the practitioner and to
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