Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"ground deformation"”.
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Ground deformation observed in the western Corinth rift (Greece) by means of SAR interferometry
… EO Supersites initiative. Seismic and geodetic ground measurements from permanent networks (since 2000) and measuring campaigns (since 1990) have been (and are) performed. Moreover dense SAR data are available since 1992 and the ERS1 mission. Motivated by the lack of precise and extended mapping …
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Study of reactive flow, ground deformation and real-time tomography with applications on CO₂ sequestration
… experiments. In Chapter 3, the surface deformation from the injection of high pressure CO₂ in Nisku carbonate formation in Alberta, Canada is simulated with a coupled model of two-phase flow and geomechanics. The fact that the injected CO₂ is dry and the analyses of the flow field …
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Current Ground Deformation Derived from GPS Observations near PBO Station AC 55 along the Yentna River, South of Denali National Park Reserve, Alaska
… 100 km proximity of AC55 to separate regional ground motion associated with seasonal variability and postseismic deformation from the 2002, M 7.9 Denali earthquake. Time series of motion in the horizontal and a vertical component was plotted for the entire network spanning the observation …
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Aquifer Compaction at Different Depths: Observations from a Vertical GPS Array at the University of Houston Coastal Center, Texas
… study area. GPS data, precipitation data, and groundwater head measurements were collected at the UHCC for two years (02/2014-02/2016). Ground deformation at 10, 20, 30, and 0 feet below the land surface (bls) were measured from four GPS stations and compared to rainfall and groundwater depth. …
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Investigation of sensitivity of surface deformation to subsurface properties and reservoir operations
… is performed to understand the sensitivity of ground deformation to subsurface properties and operations of oil and gas fields. Ground deformation, or more severely subsidence, may pose concerns for human settlements situated above the reservoir. This Masters thesis will study a realistic …
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Earth pressure balance (EPB) shield tunneling in Bangkok : ground response and prediction of surface settlements using artificial neural networks
… exists about the actual mechanisms of shield-ground interaction. The ground response mechanism induced by EPB tunneling is difficult to understand, because this requires not only reliable ground deformation measurements in the field but also operational records of the shield. Numerous …
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Land Rebound and Preconsolidation Head in the Houston Ship Channel Area
… land subsidence resulting from excessive groundwater pumping has occurred in and around Houston, Texas for nearly a century. Hydraulic heads in much of the region have been recovering steadily since the mid-1970s following the efforts of local organizations to regulate groundwater …
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Ground movements during tunnelling in sand
During soft ground tunnel construction, if the face pressure of a tunnel boring machine is not strictly controlled, excessive ground movements will propagate vertically upwards causing significant damage to adjacent buried infrastructure and surface structures. In order to investigate the face …
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The GPS Geodetic Infrastructure in the Puerto Rico and Virgin Islands Region and Its Applications for Faulting, Landslide, and Sea-Level Change Study
… which is essential to precisely delineate local ground deformation in the space and time domains. The current geodetic infrastructure in the PRVI region can distinguish ground deformation as slow as 0.4 mm/year and 0.5 mm/year in the horizontal and vertical directions, respectively. Our study …
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Weibull mixture model for grouped data and pattern identification in spatial and spatial-temporal data.
… spatial-temporal dataset that contains daily ground deformation values in a New York City tunnel excavation project. Systematic outliers and random outliers are defined and identified using robust spatial kriging models and robust time series models. The residuals from these models are pooled …
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Enhancing Mine Subsidence Prediction and Control Methodologies for Long-Term Landscape Stability
Prediction and control methodologies for ground deformation due to underground mining (commonly referred to as mine subsidence) provide engineers with the means to minimize negative effects on the surface. Due to the complexity of subsidence-related movements, numerous techniques exist for …
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Integrated geophysical studies at Masaya volcano, Nicaragua
… by the integration of dynamic micro-gravity, deformation and gas flux measurements. The acquisition of extended temporal and spatial geophysical data will also allow for the development of robust models for the dynamics of magmatic systems. Masaya volcano, Nicaragua, is one of the most active …
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Atmospheric water vapour tomography for DInSAR application and effect of volcanic plume on the microwaves
… to improve the precision of the current ground deformation monitoring techniques,is investigated. The study of atmospheric anomalies in the GPS EM waves propagation is useful to extrapolate information about the wet refractivity ?eld. Because of its height and the quite variable weather …
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Dynamic Pile-Soil Interaction in Laterally Spreading Slopes
… Using these images, transient profiles of slope deformation were quantitatively measured using Particle Image Velocimetry (PIV). These tests illustrate the potential for earthquake shaking to excite the natural frequency of the liquefied soil column, which can lead to increased transient lateral …
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Surface deformation analysis over a hydrocarbon reservoir using InSAR with ALOS-PALSAR data
… method that has been developed for estimating ground deformation and differs from the permanent scatterer technique through the method used for pixel selection. In this project, we used the SBAS method to detect the surface deformation over a hydrocarbon reservoir in Adiyaman Providence, …
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Dynamic Poroelastic Finite Element Deformation Modelling of the Bárðarbunga Volcano, Iceland, 2015-2024
Monitoring and modelling of ground deformation at volcanoes provides key insights into how a subsurface magmatic system is evolving due to magma movements at depth. Here, we present a dynamic poroelastic-reservoir Finite Element (FE) volcano deformation model. This thesis aims to reproduce the …
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Application and Evaluation of Non-Destructive Testing Methods for Buried Pipes
… to help establish the relationship between ground movement and cast iron water pipe breaks was then undertaken. A total of fifteen segments of 150 mm cast iron water pipes were monitored using an acoustic-based pipe condition assessment technique to estimate the remaining wall thickness and …
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Estimated Distributed Near-Field Surface Displacements Using Nascent Mobile Laser Scanning
… fault displacements due to non-linear deformation. Observation of near-field displacements challenges the level of detection limits of modern geosensing measurements because the rate of the displacements can be as small as several mm per year with variations only within several hundreds …
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The Mechanics of Active Faulting and Mountain Building
… The first chapter studies the postseismic deformation following the 2003 Bam earthquake in south-eastern Iran, with the intention of probing the material properties of the fault zone. Measurements of ground deformation following the earthquake made using InSAR suggest there was an unusually …
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EPOLLS: An Empirical Method for Prediciting Surface Displacements Due to Liquefaction-Induced Lateral Spreading in Earthquakes
… spreading has been a very damaging type of ground failure. When a subsurface soil deposit liquefies, intact blocks of surficial soil can move downslope, or toward a vertical free face, even when the ground surface is nearly level. A lateral spread is defined as the mostly horizontal movement …
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