Bibliographies thématiques / Waterborne geophysic

Littérature scientifique sur le sujet « Waterborne geophysic »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Waterborne geophysic"

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Sambuelli, Luigi, Adriano Fiorucci, Paolo Dabove, Ivan Pascal, Chiara Colombero et Cesare Comina. « Case history : A 5 km long waterborne geophysical survey along the Po river within the city of Turin (northwest Italy) ». GEOPHYSICS 82, no 6 (1 novembre 2017) : B189—B199. http://dx.doi.org/10.1190/geo2017-0071.1.

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The geologic investigation of water-covered areas is often difficult and inefficient with only the use of traditional surveying techniques (i.e., local drilling and sampling). Waterborne geophysical surveys can offer a valuable alternative to achieve adequate data coverage in a cost-effective way. Two geophysical waterborne methods were combined in this study for the delineation of the submerged subsurface geology along a 5 km stretch of the Po river, within the urban area of Turin. The adopted methods were: continuous vertical electrical sounding (CVES) and ground-penetrating radar (GPR). Special attention was devoted to the accurate geo-referencing of both surveys for combined interpretation. GPR results provide a high-quality representation of the river bed forms, with identification of clear sand dunes in the finer alluvial sediments. CVES resistivity sections enable a deeper characterization, identifying the interface between the shallow alluvial deposits and the deeper low-resistivity marls of the Turin-Hill succession. Our work strengthens the effectiveness of waterborne surveys for geologic prospecting of water-covered and difficult-to-access areas.
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Sambuelli, Luigi, Cesare Comina, Silvia Bava et Claudio Piatti. « Magnetic, electrical, and GPR waterborne surveys of moraine deposits beneath a lake : A case history from Turin, Italy ». GEOPHYSICS 76, no 6 (novembre 2011) : B213—B224. http://dx.doi.org/10.1190/geo2011-0053.1.

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Bathymetry and bottom sediment types of inland water basins provide meaningful information to estimate water reserves and possible connections between surface and groundwater. Waterborne geophysical surveys can be used to obtain several independent physical parameters to study the sediments. We explored the possibilities of retrieving information on both shallow and deep geological structures beneath a morainic lake by means of waterborne nonseismic methods. In this respect, we discuss simultaneous magnetic, electrical, and ground-penetrating radar (GPR) waterborne surveys on the Candia morainic lake in northerly Turin (Italy). We used waterborne GPR to obtain information on the bottom sediment and the bathymetry needed to constrain the magnetic and electrical inversions. We obtained a map of the total magnetic field (TMF) over the lake from which we computed a 2D constrained compact magnetic inversion for selected profiles, along with a laterally constrained inversion for one electrical profile. The magnetic survey detected some deep anomalous bodies within the subbottom moraine. The electrical profiles gave information on the more superficial layer of bottom sediments. We identify where the coarse morainic material outcrops from the bottom finer sediments from a correspondence between high GPR reflectivity, resistivity, and magnetic anomalies.
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Hu, Zhouhan, Mei Liu, Yaxun Wang, Maosheng Ye et Shengxuan Li. « Geophysical Assessment of Freshwater Intrusion into Saline Aquifers Beneath Plain Reservoirs ». Journal of Environmental and Engineering Geophysics 27, no 1 (mars 2022) : 13–22. http://dx.doi.org/10.32389/jeeg21-012.

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Reservoir leakage can cause a waste of precious water resources and even severe environmental consequences. In this study, we use continuous resistivity profiling to evaluate the leakage problem of the Shuangwangcheng reservoir along the east route of the South-to-North Water Diversion Project. A numerical example was first built to validate the method's effectiveness in a saline aquifer environment. Thirty-five waterborne survey lines were then conducted with a total length of 74 km, and two ground survey lines had a length of 1.27 km each. We evaluated the quality of the overall data with the apparent resistivity of intersection points. Based on ground survey results, the resistivity value larger than 2 Ω.m at the bottom of the reservoir is regarded as leakage areas. Therefore, we divide resistivity survey results into three zones: freshwater reservoir, leakage zone, and saline aquifer. The distribution of freshwater intrusion is evaluated by fence diagram and interpolated horizontal resistivity contour maps. The delineated leakage zone is consistent with the lack of a low permeable loam layer on the north and east parts of the reservoir. The results prove that the waterborne resistivity survey method can efficiently and effectively assess leakage distribution inside a reservoir.
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Huntley, David, Peter Bobrowsky, Michael Hendry, Renato Macciotta et Melvyn Best. « Multi-technique Geophysical Investigation of a Very Slow-moving Landslide near Ashcroft, British Columbia, Canada ». Journal of Environmental and Engineering Geophysics 24, no 1 (mars 2019) : 87–110. http://dx.doi.org/10.2113/jeeg24.1.87.

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Landslides in the Thompson River valley, British Columbia have the potential to adversely impact vital national railway infrastructure and operations, the natural environment, cultural heritage features, communities, public safety and the economy. To better manage geohazard risks in the primary national transportation corridor, government agencies, universities and railway industry partners are focusing research efforts on the Ripley Landslide, 7 km south of Ashcroft. The internal composition and structure of this very slow-moving landslide as revealed by geophysical surveys and terrain mapping provides contextual baseline data for interpreting slope stability monitoring results and guiding geohazard mitigation efforts. Terrestrial and waterborne geophysical surveys were undertaken using subsets of the following methods: electrical resistivity tomography, frequency electromagnetic conductivity, ground penetrating radar, primary-wave refraction and multispectral analysis of shear-waves, natural gamma radiation, induction conductivity and magnetic susceptibility. Small and irregular anomalies, areas of complex subsurface geometry and groundwater-rich zones are resolved along all terrestrial geophysical survey lines. Terrain mapping and geophysical surveys indicate a high relief bedrock sub-surface overlain by a 10 m to >30 m thick package of complex fine-grained sediments containing groundwater. Planar sub-surface features revealed in surface exposures, borehole logs and geophysical profiles include tabular bedding and terrain unit contacts. Profiles also show discrete curvilinear features interpreted as rotational-translational failure planes in clay-rich beds in the main body of the slide beneath the rail ballast and retaining wall. Integrating data from surficial geology mapping and an array of geophysical methods provided significantly more information than any one technique on its own.
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Sambuelli, Luigi, Corrado Calzoni et Manuele Pesenti. « Waterborne GPR survey for estimating bottom-sediment variability : A survey on the Po River, Turin, Italy ». GEOPHYSICS 74, no 4 (juillet 2009) : B95—B102. http://dx.doi.org/10.1190/1.3119262.

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We conducted an integrated geophysical survey on a stretch of the river Po in order to check the GPR ability to discriminate the variability of riverbed sediments through an analysis of the bottom reflection amplitudes. We conducted continuous profiles with a [Formula: see text] GPR system and a handheld broadband EM sensor. A conductivity meter and a TDR provided punctual measurements of water conductivity, permittivity, and temperature. The processing and interpretation of the GEM-2 and GPR data were enhanced by reciprocal results and by integration with the punctual measurements of the EM properties of the water. We used a processing flow that improved the radargram images and preserved the amplitude ratios among the different profiles and the frequency content at the bottom reflection signal. We derived the water attenuation coefficient both from the punctual measurements using the Maxwell formulas and from the interpretation of the GPR data, finding an optimal matching between the two values. The GPR measurements provided maps of the bathymetry and of the bottom reflection amplitude. The high reflectivity of the riverbed, derived from the GPR interpretation, agreed with the results of the direct sampling campaign that followed the geophysical survey. The variability of the bottom-reflection-amplitudes map, which was not confirmed by the direct sampling, could also have been caused by scattering phenomena due to the riverbed clasts which are dimensionally comparable to the wavelength of the radar pulse.
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Butler, Karl E. « Trends in waterborne electrical and EM induction methods for high resolution sub-bottom imaging ». Near Surface Geophysics 7, no 4 (1 janvier 2009) : 241–46. http://dx.doi.org/10.3997/1873-0604.2009002.

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Ikard, Scott J., Martin A. Briggs et John W. Lane. « Investigation of Scale-Dependent Groundwater/Surface-water Exchange in Rivers by Gradient Self-Potential Logging : Numerical Modeling and Field Experiments ». Journal of Environmental and Engineering Geophysics 26, no 2 (juin 2021) : 83–98. http://dx.doi.org/10.32389/jeeg20-066.

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Exchanges of groundwater and surface-water are fundamental to a wide range of water-supply and water-quality management issues but challenging to map beyond the reach scale. Waterborne gradient self-potential (SP) measurements are directly sensitive to water flow through riverbed sediments and can be used to infer exchange locations, direction (gain versus loss), scale, and relative changes, but to date applications to river corridor hydrology are limited. Numerical modeling and field experiments were therefore performed herein, each emphasizing waterborne gradient SP logging for identifying and locating focused vertical groundwater discharge (surface-water gain) and recharge (surface-water loss) in a river. Two and three-dimensional numerical models were constructed to simulate the polarities, appearances, and peak amplitudes of streaming-potential and electric-field anomalies on a riverbed and in the surface-water that were attributable to steady-state vertical fluxes of groundwater through high-permeability conduits in the riverbed. Effects of varied hydraulic length-scale of exchange and surface-water depth were tested through numerical modeling. Modeling results aided in data acquisition and interpretation for three repeated field experiments performed along a 1.5–2.0 km reach of the Quashnet River in Cape Cod, Massachusetts, where focused, meter-scale groundwater discharges occur at discrete locations within otherwise ubiquitous and more diffuse groundwater upwelling conditions. Strong gradient SP anomalies were repeatedly measured in the Quashnet River at previously confirmed locations of focused groundwater discharge, showing the efficacy of waterborne gradient SP logging in identifying and characterizing groundwater/surface water exchange dynamics at multiple river network scales.
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Crook, Nigel, et Dale F. Rucker. « Waterborne Electrical Resistivity of the Hypersaline Mono Lake ». Journal of Environmental & ; Engineering Geophysics 22, no 2 (juin 2017) : 191–96. http://dx.doi.org/10.2113/jeeg22.2.191.

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Colombero, Chiara, Cesare Comina, Franco Gianotti et Luigi Sambuelli. « Waterborne and on-land electrical surveys to suggest the geological evolution of a glacial lake in NW Italy ». Journal of Applied Geophysics 105 (juin 2014) : 191–202. http://dx.doi.org/10.1016/j.jappgeo.2014.03.020.

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Ganguli, Sumon, Md Akter Hosen Rifat, Dipta Das, Shahidul Islam et Md Nazrul Islam. « Groundwater Pollution in Bangladesh : A Review ». Grassroots Journal of Natural Resources 04, no 04 (31 décembre 2021) : 115–45. http://dx.doi.org/10.33002/nr2581.6853.040409.

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Bangladesh relies mainly on groundwater for irrigation and drinking purposes. Groundwater, however, continuously polluted, is a major obstacle. Nowadays, Bangladesh is moving towards industrial revolution in a considerable speed. As part of this paper's attempt to analyze the groundwater pollution scenario in Bangladesh, specifically in the past two decades, about 100 articles, conference papers, and reports published in national and international journals and books were reviewed, as well as issues concerning pollution sources, health impact assessment, and future perspectives were discussed. The groundwater is contaminated by different contaminants, such as physico-chemicals, trace metals, and microbes. Human health is at great risk from arsenic (As) contamination; it is one of the biggest threats. The cancer risk and non-cancer risk of ingesting water are increased. On the other hand, a large number of peoples were affected due to waterborne diseases governed by microbial contamination. Geophysical and anthropogenic sources, the depth of wells, and geographical factors may influence groundwater pollution. It is recommended that policy makers should address the issue immediately and precautions should be taken wherever necessary.
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Chapitres de livres sur le sujet "Waterborne geophysic"

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Huntley, David, Peter Bobrowsky et Melvyn Best. « Combining Terrestrial and Waterborne Geophysical Surveys to Investigate the Internal Composition and Structure of a Very Slow-Moving Landslide Near Ashcroft, British Columbia, Canada ». Dans Advancing Culture of Living with Landslides, 179–90. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53498-5_21.

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Actes de conférences sur le sujet "Waterborne geophysic"

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Bauman, Paul, Alastair McClymont, Landon Woods et Erin Ernst. « Current Land and Waterborne Geophysical Methods for Guiding Horizontal Directional Drilling and Trenching Along Pipeline Right-of-Ways ». Dans 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64090.

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In Western Canada, oil and natural gas pipeline projects are being considered that will move hydrocarbons from the Prairie Provinces and British Columbia, to the Pacific Ocean, the Atlantic, and even potentially the Arctic. Along the proposed right-of-ways, the pipeline engineers will encounter challenging and varied terrain, including discontinuous permafrost, creek and river crossings, glaciomarine clays, thick muskeg, and other subsurface conditions that require specialized engineering planning in advance of construction. Geophysical surveys, in support of geotechnical investigations, provide continuous subsurface information to help inform design challenges associated with the many terrain challenges. Some geophysical surveys to be considered include electrical resistivity tomography (ERT), induced polarization (IP), seismic refraction, seismic reflection, multi-channel analysis of surface waves (MASW), ground penetrating radar (GPR), and borehole geophysics. Typically, a combination of several geophysical surveys along with drilling information, are optimal for the cost-effective site characterization of problematic segments of proposed pipeline right-of-ways.
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Shields, Gordon, Scott Grossman et Alan Humphrey. « Waterborne Geophysical Surveys on Shallow River Impoundments ». Dans Symposium on the Application of Geophysics to Engineering and Environmental Problems 2004. Environment and Engineering Geophysical Society, 2004. http://dx.doi.org/10.4133/1.2923266.

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Shields, Gordon, Scott Grossman et Alan Humphrey. « Waterborne Geophysical Surveys On Shallow River Impoundments ». Dans 17th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 2004. http://dx.doi.org/10.3997/2214-4609-pdb.186.pos08.

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J. Sjostrom, Keith, Robert F. Ballard Jr. et Richard G. McGee. « A Waterborne Geophysical Technique For Assisting Proposed Dredging Projects ». Dans 5th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 1992. http://dx.doi.org/10.3997/2214-4609-pdb.210.1992_011.

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Sjostrom, Keith J., Robert F. Ballard et Richard G. McGee. « A Waterborne Geophysical Technique for Assisting Proposed Dredging Projects ». Dans Symposium on the Application of Geophysics to Engineering and Environmental Problems 1992. Environment and Engineering Geophysical Society, 1992. http://dx.doi.org/10.4133/1.2921935.

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McClymont, Alastair, Paul Bauman, Erin Ernst et Dan Parker. « What Lies Beneath : Geophysical Approaches for Assessing Trenchless Water Crossings ». Dans 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78782.

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When tied to drilling results, geophysical surveys of trenchless water crossings provide important information on subsurface geotechnical conditions, including bedrock elevation and the locations of zones of granular material within overburden. Because the terrain can change quite dramatically at water crossings, it is difficult to acquire geophysical data that is continuous between the geotechnical boreholes. The resulting data gaps can decrease confidence in understanding the site geotechnical conditions, which increases uncertainties in the detailed engineering design of the trenchless water crossing (e.g., HDD, or MTBM method). We demonstrate here how some of the technical challenges associated with acquiring continuous geophysical data at water crossings can be overcome. These include the use of suspended ERT cables, and complementary waterborne ERT and seismic refraction surveys. To illustrate the efficacy of these techniques, we present case-studies from proposed HDD crossings of three different types of water bodies at sites in British Columbia and Alberta.
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Ernst, Erin. « COMBINING LAND AND WATERBORNE ELECTRICAL RESISTIVITY TOMOGRAPHY FOR IMPROVED INFRASTRUCTURE PLANNING ON WATERWAYS ». Dans Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014. Society of Exploration Geophysicists and Environment and Engineering Geophysical Society, 2014. http://dx.doi.org/10.4133/sageep.27-042.

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Ernst, Erin. « COMBINING LAND AND WATERBORNE ELECTRICAL RESISTIVITY TOMOGRAPHY FOR IMPROVED INFRASTRUCTURE PLANNING ON WATERWAYS ». Dans Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014. Society of Exploration Geophysicists and Environment and Engineering Geophysical Society, 2014. http://dx.doi.org/10.1190/sageep.27-042.

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Bazin, S., A. Lysdahl, H. Anschütz, V. Jørdre Øybekk, R. Frauenfelder, S. Glimsdal et U. Eidsvig. « Waterborne Electrical Resistivity and Land-Based GPR Surveys for Characterization of Potential River Erosion in Larvik, Norway ». Dans 25th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902485.

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Hansen, Brad, et Adam Pidlisecky. « Numerical Modeling to Assess the Impact of Positional Errors during the Acquisition of Waterborne Continuous Resistivity Measurements ». Dans Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012. Environment and Engineering Geophysical Society, 2012. http://dx.doi.org/10.4133/1.4721774.

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Rapports d'organisations sur le sujet "Waterborne geophysic"

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Breland, Benjamin, Janet Simms, William Doll, Jason Greenwood et Ronald Kaufman. Waterborne geophysical investigation to assess condition of grouted foundation : Old River Control Complex – Low Sill Structure, Concordia Parish, Louisiana. Engineer Research and Development Center (U.S.), mai 2022. http://dx.doi.org/10.21079/11681/44183.

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The Old River Low Sill Structure (ORLSS) at the Old River Control Complex (ORCC) in Concordia Parish, LA, is a steel pile-founded, gated reinforced-concrete structure that regulates the flow of water into the Atchafalaya River to prevent an avulsion between the Mississippi River and the Atchafalaya River. A scour hole that formed on the southeast wall of ORLSS during the Mississippi River flood of 1973 was remediated with riprap placement and varied mixtures of self-leveling, highly pumpable grout. Non-invasive waterborne geophysical surveys were used to evaluate the distribution and condition of the grout within the remediated scour area. Highly conductive areas were identified from the surveys that were interpreted to consist mostly of grout. Resistive responses, likely representing mostly riprap and/or sediment, were encountered near the remediated scour area periphery. A complex mixture of materials in the remediated scour area is interpreted by the more gradual transitions in the geophysical response. Survey measurements immediately beneath ORLSS were impeded by the abundance of steel along with the structure itself. The survey results and interpretation provide a better understanding of the subsurface properties of ORLSS.
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