A5034491656- Groundwater flow and contamination studies
- Reservoir Engineering and Simulation Methods
- CO2 Sequestration and Geologic Interactions
- Monetary Policy and Economic Impact
- Hydraulic Fracturing and Reservoir Analysis
- Groundwater and Isotope Geochemistry
- Soil and Unsaturated Flow
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Geophysical and Geoelectrical Methods
- Geological Modeling and Analysis
- Landslides and related hazards
- Economic Growth and Productivity
- Hydrology and Watershed Management Studies
- Economic theories and models
- Market Dynamics and Volatility
- Geophysical Methods and Applications
- Geochemistry and Geologic Mapping
- Seismic Imaging and Inversion Techniques
- Rock Mechanics and Modeling
- Fiscal Policy and Economic Growth
- Complex Systems and Time Series Analysis
- Labor market dynamics and wage inequality
- Water Systems and Optimization
- Cryospheric studies and observations
- Economic Policies and Impacts
British Geological Survey
2015-2024
Tre Altamira (Spain)
2018
Lawrence Berkeley National Laboratory
2012-2016
Tele-Rilevamento Europa (Italy)
2005-2016
Transnet (South Africa)
2014
University of Alabama
2008-2011
Geological Survey of Alabama
2008-2011
Weatherford College
2008
Citigroup
1995-2000
Bank of England
1994-2000
Permanent scatterer InSAR (PSInSAR™) provides a new high‐resolution methodology for detecting and precisely measuring long‐term seasonal aquifer‐system response to pumping recharge. In contrast conventional InSAR, the permanent utilizes coherent radar phase data from thousands of individual reflectors on ground develop displacement time series produce velocity field maps that depict with high degree spatial detail. this study, we present first results prototype study in Las Vegas Valley,...
In this paper, we test the convergence hypothesis in a cross-section of 119 countries by means bootstrap multimodality tests and nonparametric density estimation techniques. By looking at distribution GDP across 1970, 1980 1989, find low mobility patterns intra-distribution dynamics increasing evidence for bimodality. The findings stand sharp contrast with prediction. © 1997 John Wiley & Sons, Ltd.
Capturing carbon dioxide (CO(2)) emissions from industrial sources and injecting the deep underground in geologic formations is one method being considered to control CO(2) concentrations atmosphere. Sequestering has its own set of environmental risks, including potential migration out storage reservoir resulting acidification release trace constituents shallow groundwater. A field study involving controlled groundwater containing dissolved was initiated investigate impacts. Dissolution...
This paper focuses on the Landslide Thematic services of EU-funded FP7-SPACE project SAFER (Services and Applications For Emergency Response) for inventory mapping, monitoring rapid mapping by using Earth Observation (EO). We exploited satellite Interferometric Synthetic Aperture Radar (InSAR) Object-Based Image Analysis (OBIA), discuss example applications in South Tyrol Abruzzo (Italy), Lower Austria (Austria), Lubietova (Slovakia) Kaohsiung County (Taiwan). These case studies showcase...
Results of a PSInSAR™ project carried out by the Regional Agency for Environmental Protection (ARPA) in Piemonte Region (Northern Italy) are presented and discussed. A methodology is proposed interpretation PSInSARTM data at regional scale, easy to use public administrations civil protection authorities. Potential limitations technique ground movement detection on scale monitoring then estimated relationship with different geological processes various environments.
This study investigates connectivity in a small portion of the extremely heterogeneous aquifer at Macrodispersion Experiment (MADE) site Columbus, Mississippi. A total 19 fully penetrating soil cores were collected from rectangular grid 4 m by m. Detailed grain size analysis was performed on 5 cm segments each core, yielding 1740 hydraulic conductivity ( K ) estimates. Three different geostatistical simulation methods used to generate 3‐D conditional realizations field for sampled block....
The Permanent Scatterers Synthetic Aperture Radar Interferometry (PSInSAR™) is a technique, which aims at ground deformation mapping with millimetric precision. In the framework of Globvolcano ESA project, we evaluated PSInSAR derived approach to monitor in highly active volcanic areas, based on example Piton de La Fournaise. Scatterer (PS) velocities show two main areas deformation: (1) eastern flank displaying old lava flow subsidence (0.05–0.13 m.y −1 ); and (2) summit cone disturbed by...
Abstract We propose a novel approach to link solute transport behavior the physical heterogeneity of aquifer, which we fully characterize with two measurable parameters: variance log K values ( ), and new indicator H R ) that integrates multiple properties field into global measure spatial disorder or geological entropy . From results detailed numerical experiment considering in fields representing realistic distributions hydrofacies alluvial aquifers, identify empirical relationship between...
Abstract Stochastic realizations of lithofacies assemblage based on lithological data from a relatively small number boreholes were used to simulate solute transport at the well‐known Macrodispersion Experiment (MADE) site in Mississippi (USA). With sharp vertical contrasts and lateral connectivity explicitly accounted for corresponding hydraulic conductivity fields, experimental results large‐scale tracer experiment adequately reproduced with simple model advection local dispersion. The...
One of the stylized facts unemployment is that shifts in its mean rate between decades and half-decades account for most variance. In this paper, we use a statistical analysis based on Markov switching regression models to identify dates infrequent changes series fifteen countries. We find countries, persistence much reduced once (infrequently) changing rate, induced by large shocks unemployment, has been removed. conclude observed appears be consistent with multiple equilibria an...
Extended Reality (XR) is evolving rapidly, offering new paradigms for humancomputer interaction. This position paper argues that integrating Large Language Models (LLMs) with XR systems represents a fundamental shift toward more intelligent, context-aware, and adaptive mixed-reality experiences. We propose structured framework built on three key pillars: (1) Perception Situational Awareness, (2) Knowledge Modeling Reasoning, (3) Visualization Interaction. believe leveraging LLMs within...
Abstract The recently introduced geological entropy concept evaluates spatial order/disorder in the structure of hydraulic conductivity ( K ) field to explain and predict certain characteristics transport behavior. This is expanded this work by introducing a novel tool for analysis called entrogram from which metric entropic scale H S can be calculated measure overall persistency patterns association distributed allow robust comparisons between different structures. concepts are applied here...
The national-scale British Groundwater Model (BGWM) is implemented to simulate groundwater dynamics and budgets in Great Britain. Notwithstanding the challenges of integrating a very large amount data, finding trade-off between computational efficiency realism, performing automatic calibration, addressing multiple sources structural parameter uncertainty, quantitative–qualitive evaluation approach showed that BGWM provides reasonably accurate digital representation systems processes at...
The permanent scatterers (PS) technique is a multi-interferogram algorithm for DInSAR analyses developed in the late nineties to overcome difficulties related conventional approach, namely, phase decorrelation and atmospheric effects. successful application of this technology many geophysical studies now pushing toward further improvements optimizations. A possible strategy increase number radar targets that can be exploited surface deformation monitoring adoption parametric super-resolution...
A new tracer experiment (referred to as MADE-5) was conducted at the well-known Macrodispersion Experiment (MADE) site investigate influence of small-scale mass-transfer and dispersion processes on well-to-well transport. The test performed under dipole forced-gradient flow conditions concentrations were monitored in an extraction well two multilevel sampler (MLS) wells located 6, 1.5, 3.75 m from source, respectively. shape breakthrough curve (BTC) measured is strongly asymmetric showing a...
Abstract The dissolution of CO 2 in water leads to a pH decrease and carbonate content increase affected groundwater, which turn can drive the mobilization metals from sediments. mechanisms metal release postulated various field laboratory studies often differ. Drawing primarily on previously published results, we examine contrasting behaviors at two tests one study, investigate whether same could explain releases these different experiments. Numerical modeling reveals that fast Ca‐driven...
Landslide detection and mapping are essential issues for reducing impact of such natural disasters, improving the future built-up expansion planning strategies, especially in developing countries where a reasonable land-use design is an important concern sustainable growth environmental management. Armenia landlocked country its urban development strongly tied to improvement infrastructures, which must takes into account setting slope instability area, order identify risks possible damages...
Abstract Groundwater stored in weathered basement aquifers (WBAs) is a strategic water resource. In this study, we investigate the productivity of WBAs and sustainability groundwater abstractions using novel process‐based stochastic modeling approach, which applied to simulate Precambrian aquifer Ghana. The statistical distribution generated synthetic yield data was found very good agreement with observed from same Ghanaian aquifer. Further analysis provided robust insights regarding how...
Abstract A data-driven modelling approach was applied to quantify the potential groundwater yield from weathered crystalline basement aquifers in West Africa, which are a strategic resource for achieving water and food security. To account possible geological control on aquifer productivity, seven major domains were identified based lithological, stratigraphic, structural characteristics of basement. Extensive data mining conducted hydrogeological parameterisation that led identification...
Abstract This paper analyses a number of methods for trend estimation focusing on their ability to pick up turning points quickly at the end series. An application Bank England flows M4 series is provided which shows that some proposed may be more reliable than others this task.