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1st EEGS Meeting
- Conference date: 25 Sep 1995 - 29 Sep 1995
- Location: Torino, Italy
- ISBN: 978-94-6282-129-3
- Published: 25 September 1995
101 - 120 of 142 results
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Some Results in the Complex Studies of Engineering Geophysics in Korea Depression
Authors L. Kapllani and P. NishaniThe data of the complex geophysical studies carried out in the frame-work of the seismic microzoning of Korea city are analized.
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Electronic Leak Detection System (ELDS)
Authors G. Falcone and A. AgostiniTo solve one of the main Environmental problems, the soil and water pollution produced by the leakage deriving from landfills, it has been developed a new low cost maintenance and responsive sensitive system - known as Electronic Leak Detection System, or ELDS™ - that allows for early detection of leaks in lined containment facilities.
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Using Complex Conductivity Measurements to Monitor Multiphase Hydraulic Lab Tests
Authors F. Borner, M. Gruhne and O. KemmesiesRehabilitation of contaminated sites assumes an understanding of multiphase hydraulic processes. Laboratory experiments are useful to determine hydraulic parameters for groundwater and migration modelling. Low frequency complex conductivity measurement can be a promising method to monitor the phase distribution and the water and NADL saturation during hydraulic tests.
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Porosity and Saturation Degree of Rocks Evaluated by Joint Measurements of Resistivities and Seismic Velocities
Authors E. Carrara, R. Pece, N. Roberti and T. VanorioThe search for underground waters and the protection of this natural resource are at present time of primary importance due to the continuous urban growth.
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An Electrical Monitoring of an Elemerrtary Watershed in the Rain Forest of Cameroon
Authors H. Robain, J. J. Braun, Y. Albouy and J. NdamThis study is part of the French program PEGI (Programme d'Etude de la Géosphére Intertropicale) that aims to understand hydrological and bio-geochemical behaviour in the humid tropical ecosystems. The chosen site in Africa is the small representative watershed of Nsimi (about 75 ha) located in the rain forest of South Cameroon (fig. 1A).
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Combined Seismic Electrical Investigations of an Artesian Acquifer below a Damsite in Costa Rica
Authors I. Schrijnemaekers, E. Wielemaker, K. Roy-Chowdhurry and W. BredewoutThis study reports preliminary results from a shallow damsite survey in Angostura, Costa Rica, combining reflection seismic and electrical techniques. There, an artesian aquifer presents the risk of a blow-out and needed to be mapped in 3-D for siting relief wells. Coincident deployment of both methods was somewhat hindered by surface geology and dependency of depth of investigation upon configuration. Electrical profiling data (pole-pole) have been inverted and are being checked by modelling. Seismic data have been brute stacked and a detailed velocity analysis is under way. The results presented here show that the presence or absence of the aquifer can be determined by the electrical method, whereas the seismic permits the delineation of the marker boundaries that in turn can constrain the modelling and inversion of electrical data.
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Risk of Pollution of the V. Moravia (Serbia, Yugoslavia) Aquifer System Evaluated by Geophysical Methods
By S. KomatinaIn contrast to artesian aquifers, quantitative and qualitative evaluation for natural protection of intergranular aquifers with free water surface is significantly complicated. In this case, the estimation is possible with the help of specially developed statistical method, which requires following elements referring to the zone of aeration: (1) poorly permeable strata depth; (2) filtration features; (3) groundwater level depth; (4) lithology.
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An Integrated Geophysical Investigation of Quaternary Sediments
More LessIn environmental and engineering geophysics, it is the upper 0-50 m of the subsurface that are of the principal interest. Many problems, such as the location and site of waste disposal sites or gravel deposits, need to be resolved in this depth range.
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3-D Georadar Studies in Fluvial Deposits in Northern Switzerland
Authors P. Huggenberger, M. Beres, A. Green and H. HorstmeyerBraided river systems are discontinuous but generally extensive landforms composed primarily of flood-plain sediments, gravel bars, channel fill and scour pools. More than 60 % of Switzerland's freshwater aquifers formed in this depositional environment.
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Hydrogeophysical Mapping of Minor Islands in Denmark
Authors K. I. Sorensen and F. EffersDenmark is a nation of 200 inhabited inlands - many smaller than 10 km2. Supplying good quality drinking water for the inhabitants often presents major problems, some of which are specific for islands.
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Geotectonics of Durresi Region in the Outlook of Complex Geology-Geophysical Study
Authors A. Hyseni, L. Kapllani and J. PrenciThis study represents one of the most important regions of Albania, around the Durresi city, (Dyrrachium), with a story over 2200 years old, with an intensive seismologic activity and very active neotectonics.
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Reconnaissance Logging in Sub-Horizontal Boreholes Ahead of Tunneling Operations
Authors A. Siddans and D. BecquartThe principal aim of this project is to develop efficient methods of reconnaissance logging in subhorizontal boreholes, ahead of tunneling operations.
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Effects of Magnetic Fields on Seeds Germination
Authors E. Comino, G. Ranieri and L. V. SoccoIn geophysics is recently increasing the interest on the interaction between land's biological organisme and natural and artificial fields. In the last 30 years these items have been traditional studied by biophysicists at microscopical level (cellular and molecular) while, the present work consider a bigger scale approach. In the present work, we are reporting on the first experimental results obtained by the study, at macroscopic level, of the effects on seeds germination when magnetic field of the same order of the vertical component of the earth magnetic field is artificially produced.
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Some Engineering Applications of High Resolution Microseismic Profiling (HIREP) in very Shallow to Moderate Water Depths
By A. StefanonThe economic interest in the coastal zone - which in the year 2000 will be inhabited by over 65% of the world population - has recently increased dramatically. The exploitation of coastal resources not necessarily within the "sustainable development" policy -kas brought about different engineering enterprises all over the world.
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A Combined Geophysical Survey (Seismic Reflection Profiling and Lake-Bottom Geoelectric Soundings) on the Lake Massaciuccoli
Authors M. Marchisio, F. Kohlbeck, T. McGee and Y. TuriThe Lake of Massaciuccoli, between Pisa and Viareggio, Italy, is one of the most interenting naturalistic areas in Tuscany and the "Parco Naturale di Migliarino, San Rossore e Massaciuccoli" has been founded to preserve it together with the coastal belt of pinewoods
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Modern Geophones, Do They Meet the Demands of Shallow Seismic Measurements?
Authors P. W. Maxwell, K. Faber and H. A. K. EdelmannThis paper discusses the influence of parameters such as natural frequency, spurious resonance and ground coupling on the high frequency response of geophones.
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Joint Inversion of Related Data Sets: DC Resistivity and Transient Electromagnetie Soundings
Authors D. Maier, H. R. Maurer and A. G. GreenElectrical resistivities of rocks and soils often show strong lateral and vertical variations in the shallow subsurface. These variations can be delineated with several different geophysical methods. In this study we examine the resolving power of different inversion schemes using Schlumberger DC resistivity and time-domain electromagnetic (TEM) sounding data.
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Positioning of Geophysical and Geotechnical Investigations by GPS (Global Poskioning System) Survey
Authors C. Speranza and M. MozzonThis paper illustrates the possibilities afforded by the use of GPS (Global Positioning System) survey methodology for the positioning of investigations carried out in the ground. For example in civil engineering it is very important to determine both the depth of the bedrock and the position of the site of the investigations.
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Fast Approximate 2D Interpretation of Resistivity Profile Data
Authors I. Moller, N. B. Christensen and B. H. JacobsenResistivity profile data, resulting from combined sounding and profiling, can now be collected with considerable speed due to the development of computerised measuring equipment. Owing to a higher data density and larger quantity of these profile measurements, rapid interpretation procedures are needed. We have developed a fast approximate interpretation procedure based on a deconvolution using the 2D Frechet kernel for the homogeneous halfspace.
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Continuous Transient Electromagnetic Sounding
Authors K. I. Sorensen and F. EffersSteadily growing abstraction of ground water together with the impact of pollution from surface infiltration have increased the need for hydrogeological investigations of aquifers. The mapping of subsurface resistivity structures using electrical and electromagnetic methods has gained a central role in the set-up of hydrogeological models of catchments in Denmark.
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