Thematische Bibliographien / Hydrogeological and transport modeling

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Auswahl der wissenschaftlichen Literatur zum Thema „Hydrogeological and transport modeling“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Hydrogeological and transport modeling"

Shabani, Babak, Peng Lu, Ryan Kammer und Chen Zhu. „Effects of Hydrogeological Heterogeneity on CO2 Migration and Mineral Trapping: 3D Reactive Transport Modeling of Geological CO2 Storage in the Mt. Simon Sandstone, Indiana, USA“. Energies 15, Nr. 6 (16.03.2022): 2171. http://dx.doi.org/10.3390/en15062171.

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We used three-dimensional (3D), high-resolution simulations facilitated by parallel computation to assess the effect of hydrogeological heterogeneity in the Mt. Simon Sandstone on CO2 plume evolution and storage and geochemical reactions in a portion of the Illinois Basin, Indiana. Two scenarios were selected to investigate the effects of the hydrogeological heterogeneity in 3D reactive transport simulations: a heterogeneous case with variable porosity and permeability, and a homogenous case with constant porosity and permeability. The initial pressure, temperature, and mineralogical distributions are consistently applied in both the heterogeneous case and the homogeneous case. Results indicate that including hydrogeological heterogeneity in 3D reservoir simulations for geological CO2 storage significantly impacts modeling results for plume migration patterns, CO2-water-mineral interaction, reservoir quality, and CO2 plume containment. In particular, results indicate that (1) the CO2 plume reached the top of the Mt. Simon Sandstone in the homogeneous case, but was restrained to the lower third of the formation when hydrogeologic heterogeneity was considered; (2) the dominant trapping mechanism in the heterogeneous case was mineral trapping (43%), while it was solubility trapping (47%) in the homogeneous case (at 10,000 years); (3) incorporating reservoir heterogeneity in the model leads to a higher likelihood of long-term containment.

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Stoyanov, Nikolay. „Mass-transport modeling of a fast-moving contaminant in the subsurface area of industrial sites“. Engineering Geology and Hydrogeology 32, Nr. 1 (2018): 13–22. http://dx.doi.org/10.52321/igh.32.1.13.

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The conditions for spreading of a fast-moving contaminant in the subsurface were studied at an industrial site where large amounts of contaminated water had been discharged over a relatively long period of time. The site is located in the eastern part of the town of Karlovo in Southern Bulgaria. Several hydrogeological units were distinguished in the near-surface following the application of hydrogeological methods and techniques, including investigative drilling, slug tests and laboratory tracer tests. Two-dimensional (2D) mathematical models were used to simulate the mass-transport of a fast-moving contaminant in the unsaturated and saturated zones. A deterministic modelling approach was applied in simulating the established hydrogeological units. Each unit was represented as a two-dimensional object with distinct boundaries and properties. The models were set up using VS2DTI software simulating convective mass transport, reversible elimination (sorption/ desorption), hydrodynamic dispersion, molecular diffusion and mixing. The models were used for predicting the contaminant migration from a continuous source on the surface to a depth of 15-20 m. Different model solutions were used to assess the protective effect of the man-made cover and subsurface geology at the industrial site.

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Hajrah, Ardy Arsyad und Achmad Zubair. „Modeling of Contaminant Transport and Groundwater Flow of Tamangapa Landfill in Makassar Indonesia“. Applied Mechanics and Materials 567 (Juni 2014): 92–97. http://dx.doi.org/10.4028/www.scientific.net/amm.567.92.

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This paper aims to analyze the groundwater flow direction of Tamangapa landfill and to predict the contaminant in the groundwater over the period of 20 years, accounted for the year of 2000 until 2020. To understand the natural condition of the landfill, geological and hydrogeological survey were undertaken, consisting of geological survey, geomorphology and geo-resistivity surveys. Hydrogeological survey comprises groundwater level measurement, chemical analysis of leachate and groundwater samples which were later used as input data for numerical model. Based on the result of groundwater flow models, the direction of groundwater is found to be flowing from the north to the south. The minimum concentration for manganese (Mn) is 1.519 mg/l and 2.701 mg/l for iron (Fe). Over the period of 2020, Fe concentration increases significantly, reaching the level of 56.427 mg/l, Mn concentration for 299.5594 mg/l. It can be suggested that the groundwater quality of Tamangapa landfill has already exceeded the standard for water quality, leading to potential severe impact to local people around the landfill. Keywords: Landfill, modflow, groundwater, leachate, contaminant.

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Balint, Alexandru. „Geological and hydrogeological characterization of the landfill areas located around Bucharest city in the context of environmental management“. MATEC Web of Conferences 342 (2021): 03015. http://dx.doi.org/10.1051/matecconf/202134203015.

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The process of risk assessment and investigation of potentially contaminated soil and groundwater is highly dependent on a proper understanding of the geological and hydrogeological conditions of the investigated site. The current paper aims at identifying the general geological and hydrogeological conditions of the landfill areas around Bucharest city based on interpretations of the data available in research articles, books, public reports, and geological and hydrogeological maps. Several soil samples were collected, and laboratory analyses were conducted to validate the initial expectations in terms of physical properties of the underlying strata. Results were presented as cross-sections and piezometric maps suitable for developing tridimensional models, conceptual site models and contaminant fate and transport modeling with sufficient accuracy for environmental urban planning. The research provides a quick method which may be used when assessing the general geological and hydrogeological conditions of various sites in environmental studies. The vulnerability of the Romanian legislation in data management and decision-making was also highlighted, therefore a series of recommendations to improve the data availability and quality were provided.

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Hermans, Thomas, Pascal Goderniaux, Damien Jougnot, Jan H. Fleckenstein, Philip Brunner, Frédéric Nguyen, Niklas Linde et al. „Advancing measurements and representations of subsurface heterogeneity and dynamic processes: towards 4D hydrogeology“. Hydrology and Earth System Sciences 27, Nr. 1 (12.01.2023): 255–87. http://dx.doi.org/10.5194/hess-27-255-2023.

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Abstract. Essentially all hydrogeological processes are strongly influenced by the subsurface spatial heterogeneity and the temporal variation of environmental conditions, hydraulic properties, and solute concentrations. This spatial and temporal variability generally leads to effective behaviors and emerging phenomena that cannot be predicted from conventional approaches based on homogeneous assumptions and models. However, it is not always clear when, why, how, and at what scale the 4D (3D + time) nature of the subsurface needs to be considered in hydrogeological monitoring, modeling, and applications. In this paper, we discuss the interest and potential for the monitoring and characterization of spatial and temporal variability, including 4D imaging, in a series of hydrogeological processes: (1) groundwater fluxes, (2) solute transport and reaction, (3) vadose zone dynamics, and (4) surface–subsurface water interactions. We first identify the main challenges related to the coupling of spatial and temporal fluctuations for these processes. We then highlight recent innovations that have led to significant breakthroughs in high-resolution space–time imaging and modeling the characterization, monitoring, and modeling of these spatial and temporal fluctuations. We finally propose a classification of processes and applications at different scales according to their need and potential for high-resolution space–time imaging. We thus advocate a more systematic characterization of the dynamic and 3D nature of the subsurface for a series of critical processes and emerging applications. This calls for the validation of 4D imaging techniques at highly instrumented observatories and the harmonization of open databases to share hydrogeological data sets in their 4D components.

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Iversen, Bo V., Peter van der Keur und Henrik Vosgerau. „Hydrogeological Relationships of Sandy Deposits: Modeling of Two-Dimensional Unsaturated Water and Pesticide Transport“. Journal of Environmental Quality 37, Nr. 5 (September 2008): 1909–17. http://dx.doi.org/10.2134/jeq2006.0200.

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Székely, Ferenc, József Deák, Péter Szűcs, László Kompár, Balázs Zákányi und Mihály Molnár. „Verification of Radiocarbon Transport Predicted by Numerical Modeling in the Porous Formation of NE Hungary Considering Paleo-Hydrogeology“. Radiocarbon 62, Nr. 1 (24.07.2019): 219–33. http://dx.doi.org/10.1017/rdc.2019.84.

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ABSTRACTVerification of a groundwater flow model by radiocarbon (14C) data are presented taking into consideration the paleo-hydrogeological changes. Northeastern area of the Great Hungarian Plain was a deep-lying flat area, and its central part (Nyírség) has been uplifted in the last 15,000 years. These geological events have drastically changed the hydrogeological conditions of Nyírség. The groundwater flow system is composed of the Quaternary-Pliocene-Upper Pannonian clastic sediments. Groundwater flow modeling has been performed to define the main lateral and vertical flow directions and velocities controlling the propagation of the environmental radioactive tracer 14C. Solute-transport modeling was used to calculate the 14C activity. The recent steady-state groundwater flow velocity was reduced to a reasonable value characterizing the average flow velocity over the 15 ka simulation period using “trial and error” method. The best fit between the simulated and measured 14C data was achieved by assuming 0.4 flow velocity reduction factor. Results indicate that the present steady-state flow model with this flow velocity reduction factor is capable of reproducing the observed 14C data taking into account the effect of the significant uplift of the part of the land surface in the last 15 ka in NE Hungary.

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Patel, Sharad. „Advances in Inverse Groundwater Modeling: A Comprehensive Review“. International Journal of Current Microbiology and Applied Sciences 12, Nr. 12 (10.12.2023): 83–100. http://dx.doi.org/10.20546/ijcmas.2023.1212.012.

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The management and sustainable use of groundwater resources are critical components in addressing global water challenges. In this context, inverse groundwater modeling has emerged as a powerful tool for characterizing subsurface properties, optimizing resource utilization, and mitigating the impacts of anthropogenic activities on aquifers. This review paper provides a comprehensive and up-to-date survey of the advancements in inverse groundwater modeling techniques, methodologies, and applications. The paper begins by presenting an overview of the fundamental principles underlying inverse modeling, elucidating the mathematical frameworks and numerical algorithms employed in estimating subsurface parameters. It explores various geophysical and hydrogeological data types commonly utilized in inverse modeling, such as hydraulic head measurements, and geophysical surveys. The integration of multiple data sources for enhancing model reliability and reducing uncertainty is also discussed. Furthermore, the review highlights recent developments in regularization techniques, sensitivity analysis, and uncertainty quantification within the context of inverse groundwater modeling. Case studies from diverse hydrogeological settings illustrate the practical applications of these methodologies in real-world scenarios, showcasing their efficacy in addressing complex groundwater management challenges, including contaminant transport, aquifer recharge, and sustainable resource exploitation. The review concludes by outlining current research gaps and future directions in the field of inverse groundwater modeling, emphasizing the need for interdisciplinary collaboration, data integration, and advanced computational approaches. This synthesis of contemporary knowledge serves as a valuable resource for researchers, practitioners, and policymakers engaged in groundwater management and environmental sustainability.

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Bui, Minh Tuan, Jinmei Lu und Linmei Nie. „A Review of Hydrological Models Applied in the Permafrost-Dominated Arctic Region“. Geosciences 10, Nr. 10 (06.10.2020): 401. http://dx.doi.org/10.3390/geosciences10100401.

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The Arctic region is the most sensitive region to climate change. Hydrological models are fundamental tools for climate change impact assessment. However, due to the extreme weather conditions, specific hydrological process, and data acquisition challenges in the Arctic, it is crucial to select suitable hydrological model(s) for this region. In this paper, a comprehensive review and comparison of different models is conducted based on recently available studies. The functionality, limitations, and suitability of the potential hydrological models for the Arctic hydrological process are analyzed, including: (1) The surface hydrological models Topoflow, DMHS (deterministic modeling hydrological system), HBV (Hydrologiska Byråns Vattenbalansavdelning), SWAT (soil and water assessment tool), WaSiM (water balance simulation model), ECOMAG (ecological model for applied geophysics), and CRHM (cold regions hydrological model); and (2) the cryo-hydrogeological models ATS (arctic terrestrial simulator), CryoGrid 3, GEOtop, SUTRA-ICE (ice variant of the existing saturated/unsaturated transport model), and PFLOTRAN-ICE (ice variant of the existing massively parallel subsurface flow and reactive transport model). The review finds that Topoflow, HBV, SWAT, ECOMAG, and CRHM are suitable for studying surface hydrology rather than other processes in permafrost environments, whereas DMHS, WaSiM, and the cryo-hydrogeological models have higher capacities for subsurface hydrology, since they take into account the three phase changes of water in the near-surface soil. Of the cryo-hydrogeological models reviewed here, GEOtop, SUTRA-ICE, and PFLOTRAN-ICE are found to be suitable for small-scale catchments, whereas ATS and CryoGrid 3 are potentially suitable for large-scale catchments. Especially, ATS and GEOtop are the first tools that couple surface/subsurface permafrost thermal hydrology. If the accuracy of simulating the active layer dynamics is targeted, DMHS, ATS, GEOtop, and PFLOTRAN-ICE are potential tools compared to the other models. Further, data acquisition is a challenging task for cryo-hydrogeological models due to the complex boundary conditions when compared to the surface hydrological models HBV, SWAT, and CRHM, and the cryo-hydrogeological models are more difficult for non-expert users and more expensive to run compared to other models.

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Vallner, L., und A. Porman. „Groundwater flow and transport model of the Estonian Artesian Basin and its hydrological developments“. Hydrology Research 47, Nr. 4 (08.02.2016): 814–34. http://dx.doi.org/10.2166/nh.2016.104.

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The sophisticated research and management problems of the Estonian water environment are considered by means of holistic modelling. The model elaborated is based on the computer code Visual MODFLOW Classic. The model encompasses the entire Estonian Artesian Basin (EAB) and the border districts of Russia and Latvia. It involves all main aquifers and aquitards on an area of 88,000 km2. The main hydrogeological and hydrological characteristics of the study area, including the time-dependent three-dimensional distribution of groundwater heads, the direction, velocity and rate of subsurface fluxes, itemised water budgets, volumes of hydrogeological units, and durations of groundwater exchange have been determined by modelling. The palaeohydrological situation during the last continental glaciation of the EAB was reconstructed and the principal problems of the sustainable management of water environment were elucidated. The model has been used to simulate the local and cumulative rates of the base flow.

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Dissertationen zum Thema "Hydrogeological and transport modeling"

Frost, Nageena Kiani. „CFD modelling of fluid flow and contaminant transport in hydrogeological systems“. Thesis, University of Greenwich, 2006. http://gala.gre.ac.uk/6171/.

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This study provides an understanding of various aspects of hydrogeological systems modelling and the use of computational techniques to predict and optimise hydrological parameter assessment, anisotropic scaling, macrodispersion and solute flux measurements under unsteady, uniform/non-uniform flow conditions. The incorporated models are structured around multi-physics continuum mechanics analysis to investigate fluid flow and solute transport in hydrogeological systems. The control-volume unstructured mesh configuration, based on cell-centred or vertex-based FV algorithms for CFD and CSM problems is employed. The non-linear material behaviour exhibited by porous soils and the fluid flow evaluation under system stresses is described by elasto-visco-plastic constitutive relationships and the coupling between CFD and CSM processes. The designed simulation models are used to calibrate the flow problems associated with regional groundwater levels estimation, determination of soil hydraulic properties and moisture distribution in dry soils in response to infiltration of compressible or incompressible fluids. For solute transport problems, investigations of spatial distribution of solute species in homogeneous/layered heterogeneous systems are undertaken by accounting for chemical, geochemical and biological reactions caused by particle deposition processes and liquid-solid interactions in natural subsurface systems. The simulated shape and spread of contaminant plume are effectively influenced by the governing transport mechanism for solutes. The attention in leachate is predicted to have a significant role in reducing the level of contaminant concentration and its potential impact on the attainable groundwater resources.

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Muhammad, Sarkawt Hamarahim. „Application of Numerical Modeling to Study River Dynamics: Hydro-Geomorphological Evolution Due to Extreme Events in the Sandy River, Oregon“. PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3478.

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The Sandy River (OR) is a coastal tributary of the Columbia River and has a steep hydroshed 1316 square kilometers which is located on the western side of Mount Hood (elevation range 3 m to 1800 m). The system exhibits highly variable flow: Its average discharge is ~40 m3/s, and the highest recorded discharge was 1739 m3/s in 1964. In this study I model the geomorphic sensitivity of an 1800m reach located the downstream of the former Marmot Dam, which was removed in 2007. The hydro-geomorphic response to major flood has implications for system management and aquatic life. Studying hydro-geomorphic change requires a systematic approach. Here, I define flows and flood hydrographs for specified return interval based on the observed hydrologic record, and then examine potential hydro-geomorphic changes using a numerical model. A Pearson Type III distribution is used to calculate 100, 75, 50, 25, 10, and 2 year return periods. Extreme event hydrographs are derived by fitting derived and observed flood hydrographs to the gamma distribution curve. Sediment transport and geomorphology are then modeled numerically with Nays2DH, a solver that is part of iRIC software. Because the model is computationally intensive, I model the domain with five different spatial grid resolutions, to find proper grid resolution. The grid resolutions used are 1.5 m, 2 m, 3 m, 4 m, and 5 m. We choose 4 m as optimum grid resolution, based on the convergence of model results. The model is run for extreme event hydrographs with six above return periods. For result visualization and analysis, we focus on flow properties and bed elevation at peak flow and at the end of each event. For both times for each event, important flow and sediment transport parameters are visualized for the entire domain in plane form and eight cross-sections at 200 m intervals. Finally, we divide the geomorphic response into areas of erosion and deposition. Linear regression analyses of mean values of erosion and deposition at peak flow for all extreme events yield R2 of 0.981 for erosion and 0.986 for deposition. The mean erosion and deposition depth at the end of the events is modeled by nonlinear regression with correlation coefficient of 0.965 for erosion and 0.998 for deposition. The regression models provide direct understanding of impacts of different floods on the geomorphic response of the river domain. examination of the model as a whole suggest that the amount of erosion and deposition in the bed and banks is a function of channel geometry, bank and bed geology, riparian area condition and strongly depend on the amount of flow through the channel.

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Guillemoto, Quentin. „Transfert des molécules organiques traces des eaux usées traitées dans un système de Soil Aquifer Treatment (SAT) : application à l’hydrosystème côtier d’Agon-Coutainville“. Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS510.

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Les pressions sur les eaux souterraines (sècheresses, surexploitations, pollutions…) contribuent à une diminution globale de la disponibilité de la ressource. Les solutions de recharge maitrisée des aquifères (MAR) et de traitement de l’eau par le sol et l’aquifère (SAT) présentent des avantages certains pour une future gestion durable de la qualité et de la quantité des eaux souterraines et notamment par l’utilisation des eaux usées traitées. La préservation de la qualité des eaux souterraines lors de l’introduction de ces eaux dans un système MAR doit être assurée. Une difficulté majeure réside dans la compréhension des processus induits par ces techniques conditionnant la qualité des eaux souterraines, notamment les molécules organiques traces (TrOCs) présentes dans les eaux usées traitées qui font l’objet d’une attention particulière ces dernières années. A ce jour, la compréhension du devenir des TrOCs dans un SAT est très limitée malgré une connaissance croissante des processus régissant leur réactivité (dégradation, sorption). Encore plus rares sont les études qui considèrent le SAT comme partie intégrante d’un hydrosystème naturel, dans lequel la dynamique des écoulements souterrains augmente la complexité du comportement de ces molécules. La méthodologie de la thèse combine l’analyse de données, l’expérimentation et la modélisation mises en œuvre à des échelles spatio-temporelles différentes. Elle est appliquée au site SAT côtier localisé à Agon-Coutainville (Normandie, France) actif depuis plus de 20 ans. L’interprétation des données acquises sur le terrain par des outils géochimiques et d’analyse de séries temporelles établi une première description du comportement d’une sélection de TrOCs dans le SAT. Les résultats à l’échelle du site montrent la diversité de comportement des TrOCs associée à la fois à des facteurs réactifs, opérationnels et hydrodynamiques. Une expérience d’infiltration contrôlée en conditions opérationnelles à l’échelle d’un bassin d’infiltration sur 35 jours est interprétée à l’aide d’outils de modélisation géochimique et analytique du transport réactif (Advection-Dispersion Equation, ADE). Les résultats montrent une atténuation naturelle de 5 TrOCs via le SAT après un temps de résidence moyen de 12 jours par la quantification des coefficients de dégradation du premier ordre (μ) et coefficient de retard (R). A l’échelle pluriannuelle de l’aquifère accueillant le système SAT, un modèle d’écoulement et de transport (MARTHE) est construit afin de quantifier l’influence des facteurs environnementaux (climat, marées, conditions opérationnelles) sur l’hydrosystème côtier quant au devenir des TrOCs. Les résultats du modèle montrent leurs incidences sur les vitesses d’écoulement, la dilution et la réactivité des TrOCs. Une atténuation des concentrations en TrOCs par réactivité est attendue sur les deux-tiers de la surface du SAT lors des 6 mois de l’année les plus secs, alors que sur la surface restante, la dynamique marine locale amène une baisse des concentrations majoritairement par dilution. A l’exutoire naturel de l’aquifère, les temps de résidence moyens simulées s’étalent entre 74 et 489 jours selon la dynamique saisonnière qui pourrait être précisée par des investigations complémentaires concernant les eaux de surface (mer et cours d’eau). Ces travaux apportent une méthodologie innovante pluridisciplinaire intégrant divers outils pour aborder le devenir des TrOCs dans des systèmes SAT à différentes échelles spatiales et temporelles, tout en considérant le comportement hydrodynamique et réactif de tels systèmes. De nombreuses perspectives à ces travaux de thèse s’ouvrent, particulièrement concernant la caractérisation fine de la réactivité des TrOCs dans de tels systèmes en contexte côtier, ou encore le développement d’outils de modélisation hydrodynamique intégrant des processus réactifs mécanistiques, ce qui améliorerait la compréhension du comportement des TrOCs dans ces systèmes
Pressures on groundwater (droughts, overexploitation, pollution, etc.) contribute to an overall decrease in the availability of the resource. Manages Aquifer Recharge (MAR) and Soil Aquifer Treatment (SAT) have clear advantages for future sustainable quality and quantity management of groundwater, especially through the use of treated wastewater. The preservation of groundwater quality when introducing these so-called unconventional waters into MAR must be ensured. A major difficulty lies in understanding the processes induced by these techniques that affect groundwater quality. These include the Trace Organic Compounds (TrOCs) present in treated wastewater, which have received particular attention in recent years. To date, the understanding of the fate of TrOCs at the scale of a SAT site is very limited despite a growing knowledge of the processes induced (degradation, sorption). Even fewer studies consider the SAT system as an integral part of a natural hydrosystem, in which the dynamics of groundwater flows increase the complexity of the behaviour of these molecules. The methodology of the thesis combines data analysis, experimentation and modelling implemented at different spatio-temporal scales. It was applied to the coastal SAT site located in Agon-Coutainville (Normandy, France) which has been active for more than 20 years. Interpretation of the data acquired in the field using geochemical and time series analysis tools allowed a first description of the behaviour of a selection of TrOCs within a SAT system. The results at the site scale show the diversity of behaviour of TrOCs in the SAT associated with reactive, operational and hydrodynamic factors. A controlled infiltration experiment under operational conditions at the scale of an infiltration basin over 35 days was interpreted using geochemical modelling tools and analytical modelling of reactive transport (Advection-Dispersion Equation, ADE). The results show a natural attenuation of TrOCs from the SAT after an average residence time of 12 days in the SAT by quantifying first-order degradation coefficients (μ) and retardation coefficients (R) for some molecules On the multi-year scale of the aquifer hosting the SAT system, a flow and transport model (MARTHE) was built to quantify the influence of environmental factors (climate, tides, operational conditions) on the coastal hydrosystem with regard to the fate of TrOCs. The results of the model show their impact on flow rates, dilution and reactivity of TrOCs. An attenuation of TrOC concentrations by reactivity is expected over two-thirds of the surface of the SAT during the driest six months of the year, while over the remaining surface, local marine dynamics lead to a decrease in concentrations mainly by dilution. At the natural outlet of the aquifer, the simulated average residence times range from 74 to 489 days depending on the seasonal dynamics, which could be specified by additional investigations concerning the surface water (sea and river). This work provides an innovative multidisciplinary methodology integrating various tools to address the fate of TrOCs in SAT systems at different spatial and temporal scales, while considering the hydrodynamic and reactive behaviour of such systems. Many perspectives to this thesis work are arising, particularly concerning the characterisation of the reactivity of TrOCs in such systems in a coastal context, or the development of hydrodynamic modelling tools integrating more mechanistic reactive processes, which would improve the understanding of the behaviour of TrOCs in these systems

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Ross, James. „Approximate Reasoning in Hydrogeological Modeling“. ScholarWorks @ UVM, 2008. http://scholarworks.uvm.edu/graddis/200.

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The accurate determination of hydraulic conductivity is an important element of successful groundwater flow and transport modeling. However, the exhaustive measurement of this hydrogeological parameter is quite costly and, as a result, unrealistic. Alternatively, relationships between hydraulic conductivity and other hydrogeological variables less costly to measure have been used to estimate this crucial variable whenever needed. Until this point, however, the majority of these relationships have been assumed to be crisp and precise, contrary to what intuition dictates. The research presented herein addresses the imprecision inherent in hydraulic conductivity estimation, framing this process in a fuzzy logic framework. Because traditional hydrogeological practices are not suited to handle fuzzy data, various approaches to incorporating fuzzy data at different steps in the groundwater modeling process have been previously developed. Such approaches have been both redundant and contrary at times, including multiple approaches proposed for both fuzzy kriging and groundwater modeling. This research proposes a consistent rubric for the handling of fuzzy data throughout the entire groundwater modeling process. This entails the estimation of fuzzy data from alternative hydrogeological parameters, the sampling of realizations from fuzzy hydraulic conductivity data, including, most importantly, the appropriate aggregation of expert-provided fuzzy hydraulic conductivity estimates with traditionally-derived hydraulic conductivity measurements, and utilization of this information in the numerical simulation of groundwater flow and transport.

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Orr, A. E. „Hydrogeological influences on the fate and transport of nitrate in groundwater“. Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.680365.

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Nitrate (N03) contamination is a significant global concern in many agricultural catchments. This research undertook a national scale and a catchment scale to investigate the influence of hydrogeological setting the fate and transport of N03 in agricultural catchments. In this researc statistical analyses of a national database showed that groundwater N03 concentrations are controlled by a combination of factors including the hydrogeological. setting, which incorporates transmissivitY ' and flow path length, landuse pressure, soil type, subsoil thickness and" permeability, groundwater oxidation reduction potential (ORP) conditions. A catchment scale study was undertaken of two study catchments containing contrasting hydrogeological characteristics. In the Nuenna catchment underlain by an Rkd aquifer, point sources are not a significant influence on the water quality in terms of N in the Nuenna River. In the Glen Burn catchment, underlain by a Pl aquifer, point sources have a significant influence on the Glen Burn River water quality. This contribution from sources increases as the groundwater level decreases and discharge from shallow groundwater reduces. Greater storage and persistence of N03 in the Nuenna Rkd aquifer indicate that lag time for a decrease in groundwater N03 concentrations to occur more significant factor in Rkd aquifers. In contrast, lag time is not as significant in the Glen Burn Pl aquifer where N03 concentrations in the shallow bedrock are influenced by groundwater table fluctuations, the presence of preferential pathways through the till and seasonal changes pressure loadings. Denitrification with depth in this aquifer is shown through suitable hydrochemical conditions, an isotopic enrichment ratio 1.8:1 between 015N and 0180 and the presence of bacteria containing the gene. In contrast, hydrochemical, isotopic and microbial analyses have that denitrification is not significant in the Nuenna catchment, but the dominant biogeochemical process is nitrification.

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Matynowski, Eric D. „Groundwater Modeling and Hydrogeological Parameter Estimation: Potomac Aquifer System, SWIFT Research Center“. Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99171.

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The Sustainable Water Interactive for Tomorrow (SWIFT) project in eastern Virginia is a Managed Aquifer Recharge project designed to alleviate the depletion of the Potomac Aquifer System due to unsustainable groundwater withdrawals. At the SWIFT Research Center (SWIFTRC) in Nansemond, VA, a pilot testing well (TW-1) has been implemented to help determine the feasibility of full-scale implementation. The pumping data from TW-1 and observation head data from surrounding monitoring wells (MW) at the SWIFTRC were used to calculate hydrogeological parameters (transmissivity, hydraulic conductivity, specific storage, and storage coefficient). Two sets of data were analyzed from before and after TW-1 was rehabilitated to account for the change in the flow distribution to each screen in TW-1. Comparing the results to past literature, the calculated (Theis and Cooper-Jacob methods) hydraulic conductivity/transmissivity values are within the same order of magnitude. Using borehole logs as well as apparent conductance and resistivity logs, multiple single and multi-layered models for both the upper and middle Potomac aquifers were produced with MODFLOW. Parameter estimation using MODFLOW and PEST and the two sets of observation data resulted in hydrogeological parameters similar to those calculated using Theis and Cooper-Jacob methods. The change in the hydraulic conductivity and specific storage between the pre and post rehabilitation flow distributions is proportional to that change in the flow distribution. For future modeling of the aquifer system, the hydrogeological parameters from the model using the 4/26/19 data set with the post rehabilitation flow distribution is recommended. Drawdown results from a multi-layered MODFLOW model were compared to results using the Theis method using both the Theis-calculated and MODFLOW-PEST modeled hydrogeological parameters. The results were nearly identical except for the Upper Potomac Aquifer (UPA) layer 1, as the model has a large change in aquifer thickness with distance from TW-1 that the Theis-based calculations do not consider. Travel times from the monitoring wells to TW-1 were calculated with the single and multi-layered models pumping 700 GPM from TW-1. Travel times from the SWIFT MW within the UPA sublayers ranged from 204 to 597 days depending on the sublayer, while travel times from the USGS MW within the UPA sublayers ranged from 2,395 to 7,859 days. For the single layer model of the UPA, the travel time from the SWIFT MW to TW-1 was 372 days while the travel time from the USGS MW was 4,839 days. Travel times from the SWIFT MW within the MPA sublayers were 416 and 1,195 days, while travel times from the USGS MW within the MPA sublayers were 4,339 and 11,245 days. For the single layer model of the MPA, the travel time from the SWIFT MW to TW-1 was 743 days while the travel time from the USGS MW was 7,545 days.
Master of Science
The Sustainable Water Interactive for Tomorrow (SWIFT) project in eastern Virginia is a project designed to help slow the depletion of the Potomac Aquifer System due to unsustainable groundwater withdrawals. At the SWIFT Research Center (SWIFTRC) in Nansemond, VA, a testing well (TW-1) has been implemented to help determine if the full-scale implementation of the SWIFT project is feasible. The pumping data from TW-1 and observation head data from surrounding monitoring wells (MW) at the SWIFTRC were used to calculate hydrogeological parameters (transmissivity, hydraulic conductivity, specific storage, and storage coefficients). These parameters help describe the behavior of the aquifer system. Two sets of data were analyzed from before and after TW-1 was rehabilitated to account for the change in the flow distribution within TW-1. Comparing the results to past literature, the calculated (using analytical methods, Theis and Cooper-Jacob methods) hydraulic conductivity/transmissivity values are within the same order of magnitude. Using data from the boreholes, multiple single and multi-layered models for both the upper and middle Potomac aquifers were produced with MODFLOW, a groundwater modeling software. Estimating parameters using observation data within MODFLOW resulted in hydrogeological parameters similar to those calculated using the Theis and Cooper-Jacob methods. The change in the hydraulic conductivity and specific storage between the pre and post rehabilitation flow distributions within TW-1 is proportional to that change in the flow distribution. For future modeling of the aquifer system, the hydrogeological parameters from the model using the 4/26/19 (most recent) data set with the post rehabilitation (more current) flow distribution is recommended. Drawdown (decrease in the water table) results from a multi-layered MODFLOW model were compared to results using the Theis method using both the Theis-calculated and MODFLOW modeled hydrogeological parameters. The results were nearly identical except for the Upper Potomac Aquifer (UPA) layer 1, as the model has a large change in aquifer thickness with distance from TW-1 that the Theis-based calculations do not consider. The time it took for a particle of water to travel from the monitoring wells to TW-1 were calculated with the single and multi-layered models pumping 700 GPM from TW-1. Travel times from the SWIFT MW within the UPA sublayers ranged from 204 to 597 days depending on the sublayer, while travel times from the USGS MW within the UPA sublayers ranged from 2,395 to 7,859 days. For the single layer model of the UPA, the travel time from the SWIFT MW to TW-1 was 372 days while the travel time from the USGS MW was 4,839 days. Travel times from the SWIFT MW within the MPA sublayers were 416 and 1,195 days, while travel times from the USGS MW within the MPA sublayers were 4,339 and 11,245 days. For the single layer model of the MPA, the travel time from the SWIFT MW to TW-1 was 743 days while the travel time from the USGS MW was 7,545 days.

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STEFANIA, GENNARO ALBERTO. „HYDROGEOLOGICAL MODELING TO SUPPORT THE MANAGEMENT OF GROUNDWATER RESOURCES IN ALPINE VALLEYS“. Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199125.

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Il presente progetto di dottorato riguarda lo sviluppo di metodologie e strumenti modellistici a supporto della gestione delle risorse idriche sotterranee da un punto di vista quantitativo e qualitativo. A tale scopo, il progetto ha preso in considerazione gli acquiferi delle valli alpine, i quali rappresentano un particolare contesto idrogeologico in sui le interazioni tra acque sotterranee e superficiali nonché il pompaggio dei pozzi incidono profondamente sul comportamento idraulico delle falde. Inoltre, l'impostazione idrogeologica di questi acquiferi rende le acque sotterranee altamente vulnerabili alla contaminazione da parte delle attività umane. Il lavoro, sviluppato in collaborazione con ARPA Valle d’Aosta, ha preso in considerazione tre aspetti principali che riguardano la gestione qualitativa e quantitativa dell’acquifero della Piana d'Aosta (Regione Valle d'Aosta, Italia). Il primo aspetto ha riguardato la modellizzazione tridimensionale dell’acquifero della Piana d’Aosta e delle sue interazione con le acque superficiali. A tale scopo è stato sviluppo un modello numerico per simulare il flusso idrico sotterraneo al fine di identificare e quantificare le relazioni di scambio tra acque sotterranee e acque superficiali e allo stesso tempo valutare l'effetto del pompaggio sulle risorse idriche. Il modello di flusso idrico sotterraneo è stato sviluppato utilizzando MODFLOW2005 accoppiato al più recente pacchetto Stream-Flow routine package (SFR2) per simulare la rete idrica superficiale. Il modello, settato in condizioni stazionarie e transitorie, è stato calibrato mediante una procedura di calibrazione inversa eseguita usando il codice PEST. I risultati del modello hanno permesso di quantificare il bilancio idrogeologico, le interazioni acque sotterranee/superficiali, valutare l’effetto del pompaggio sulle risorse idriche, nonché individuare le aree più idonee per la realizzazione di nuovi pozzi. Il secondo aspetto ha riguardato la gestione dei dati idrochimici delle acque sotterranee, il quale ha condotto allo sviluppo di un database idrochimica, disponibile online, chiamato TANGCHIM. Tale database idrochimico è stato accoppiato ad un pre-esistente database idrogeologico (TANGRAM) al fine di fornire una piattaforma integrata in grado di gestire, visualizzare e condividere tutti i dati idrogeologici e idrochimici relativi a pozzi e piezometri. Il terzo argomento ha riguardato l’analisi di un fenomeno d’inquinamento delle acque sotterranee dovuto all’ingresso di percolato proveniente da un sito di discarica presente nella Piana d’Aosta. Questo lavoro è stato suddiviso in due parti principali. La prima parte ha previsto la definizione di una metodologia generalizzata in grado di supportare gli enti gestori delle acque sotterranee alla definizione del modello concettuale di un sito contaminato (in questo caso una discarica) e, allo steso tempo, calcolare i livelli di guardia ai sensi della direttiva Europea sulle discariche (1999/31/EC). Tale metodologia costituisce complessivamente uno strumento utile per la pianificazione del monitoraggio di siti di discarica situati in aree storicamente impattate da pregresse attività antropiche. Il secondo obiettivo ha riguardato l’individuazione, all’interno del sito di discarica, delle aree sorgenti attraverso cui il percolato si infiltra nel sottosuolo, contaminando le acque di falda. L'indagine è stata condotta utilizzando i dati idrochimici e zuccheri artificiali campionati nel marzo 2017, applicando tecniche di statistica multivariata e modelli di trasporto. L’individuazione delle sorgenti si è resa necessaria al fine di migliorare la gestione del sito e progettare un adeguato sistema di bonifica.
The present PhD project deals with the development of methodologies and tools in order to support the management of groundwater resources from a quantitative and qualitative point of view. The work deals with a particular hydrogeological context such as the Alpine valleys aquifers, where groundwater/surface water interactions as well the wells pumping have a crucial role in the hydraulic behaviour of groundwater. Moreover, the hydrogeological setting of these aquifers makes groundwater highly vulnerable to the contamination by the human activities. The work involves three main topics concerning specified issues affecting the Alpine valley aquifer of the Aosta Plain (Aosta Valley Region, N Italy). The first topic is related to the modeling of the three-dimensional groundwater flow and its interaction with the surface water. This topic was addressed by the development of a numerical groundwater flow model of the Aosta Plain aquifer in order to identify groundwater/surface-water relationships and evaluate the overall effect of the pumping on water resources. The model was developed using MODFLOW2005 and the more recent Stream-Flow routine package (SFR2) to simulate the surface-water network. An inverse calibration procedure performed by the PEST code was used to obtain the steady-state and transient solutions. The quantification of the hydrogeological budget, the groundwater/surface-water interactions and the effect of well withdrawals on water resources were done using the model results. The second topic deals with the management of groundwater hydrochemical data. This topic was addressed through the development of the online hydrochemical database called TANGCHIM which was joined with an existing hydrogeological database in order to provide an integrated platform able to manage, display and share water quality and quantity data. The third topic takes into account a groundwater pollution related to a landfill site. Within this topic, two main aims were achieved. The first one is related to the definition of a methodology able to support groundwater managers to define the conceptual model of the site and to calculate the trigger levels, a useful tool for monitoring landfill sites located in historical human-impacted areas. The second aim is related to the detection of the sources related to the groundwater contamination affecting the landfill site. The investigation was conducted using hydrochemical parameters and artificial sweeteners, multivariate statistical analysis and transport modeling. The source apportionment analysis was accomplished to distinguish the contribution of different sources of the leachate infiltration in order to improve the management of the landfill site and design a proper remediation system.

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O'Shaughnessy, Vince. „The hydrogeological and contaminant transport properties of fractured Leda clay in eastern Ontario“. Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6782.

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The objectives of the study were to investigate the hydraulic, geochemical and solute or contaminant transport properties of the upper fractured zone at four Leda clay deposits in Eastern Ontario. These four sites are known as NRC, Fallowfield, Renfrew and Casselman. Physical conditions and depth of fractures of the Leda subsoil was investigated with the use of boreholes and test pits. Piezometers were installed using a conventional auger method and the double-Shelby method developed at the University of Waterloo. Hydrogeological aspects of the upper twelve metres were analyzed using water level fluctuations and variation profiles, hydraulic head and conductivity profiles. A geochemistry analysis was made by measuring the major ions and tritium concentration distribution in groundwater samples obtained from piezometers. Laboratory tests were performed on five Leda clay samples to determine the effective diffusion coefficients and the retardation factors of the major ions. The results of the study indicated that the upper portion of Leda clay deposits within Eastern Ontario are fractured and hydraulically active. Fractured Leda clay deposits less than 12 metres in depth are highly questionable on their ability to protect any underlying aquifer from surficial or buried contaminants.

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Ismail, Mohd Ashraf bin Mohamad. „Study on hydrogeological modeling and evaluation of groundwater behaviors in fractured rock mass“. 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120805.

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Blumstock, Maria Elisabeth. „Spatial organisation of groundwater-surface water interactions in an upland catchment : integrating hydrometric, tracer and modelling approaches“. Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=233033.

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This thesis presents studies of the heterogeneous nature of groundwater-surface water (GW-SW) interactions at the hillslope and catchment scale in the 3.2km2 Bruntland Burn, UK. GW fluctuations were measured within three contrasting hydropedological units. Synoptic hydrogeochemical surveys were carried out (major ions, stable isotopes) to capture the increased influence of GW to the stream during a 10year return period drought. The catchment was shown to have highly dynamic GW stores, with each landscape unit translating into different rainfall-runoff processes. Soil characteristics were shown to be the strongest predictors for variability in GW dynamics. Each soil type was characterised by a unique storage-discharge relationship and threshold response with a certain GW level above which lateral flow dominated. On the lower hillslope, predominating lateral flow and little recharge to depth is supported by hydrologically responsive soils. Connectivity between the steeper slopes and the valley bottom, however, needed persistent wet periods to overcome storage thresholds. Here, vertical flow paths recharging deeper GW dominated, with GW levels falling below the soil layer into the underlying drift. It was found that relatively well mixed, near-surface sources of stream flow predominated in wetter conditions, whilst baseflows are variable and reflect a diverse range of GW stores. Geophysics (ERT) and GW level measurements were integrated into MODFLOW-NWT to simulate GW-SW interactions along a representative 2D-hillslope transect. Although only a preliminary model, it was shown that shallow pathways have much shorter residence times, thus maintaining high water tables in the riparian peatlands, than deeper flow paths discharging through the drift and directly into the stream. Largest sources of GW are located within the drift, resulting in complex spatial patterns of runoff generation. This work illustrated the utility of a basic model to predict GW flow paths, highlighting how water and solutes are stored and released in montane headwater catchments.

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Bücher zum Thema "Hydrogeological and transport modeling"

Xiao, Yitian, Fiona Whitaker, Tianfu Xu und Carl Steefel, Hrsg. Reactive Transport Modeling. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119060031.

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Saline water intrusion and hydrogeological modeling in southwest Bangladesh. Berlin: Schelzky & Jeep, 1992.

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Idan, Ofer. Modeling Nanoscale Transport Systems. [New York, N.Y.?]: [publisher not identified], 2014.

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Ruocco, Gianpaolo. Introduction to Transport Phenomena Modeling. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-66822-2.

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Logan, J. David. Transport Modeling in Hydrogeochemical Systems. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4757-3518-5.

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P, Brorby Gregory, ChemRisk und Colorado. Dept. of Public Health and Environment, Hrsg. Exposure pathway identification & transport modeling. Alameda, CA: ChemRisk, 1994.

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R, Eggleston Jack, Geological Survey (U.S.) und Coalition of Six Middle Rio Grande Basin Pueblos (N.M.), Hrsg. Survey of hydrologic models and hydrologic data needs for tracking flow in the Rio Grande, North-Central New Mexico, 2010. Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2012.

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Tillery, Anne. Survey of hydrologic models and hydrologic data needs for tracking flow in the Rio Grande, North-Central New Mexico, 2010. Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2012.

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E, Schiesser W., Hrsg. Dynamic modeling of transport process systems. San Diego: Academic Press, 1992.

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Bear, Jacob, und Alexander H. D. Cheng. Modeling Groundwater Flow and Contaminant Transport. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-1-4020-6682-5.

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Buchteile zum Thema "Hydrogeological and transport modeling"

Schößer, Britta, Arash Alimardani Lavasan, Wiebke Baille, Thomas Barciaga, Sascha Freimann, Mario Galli, Sebastian Kube et al. „Face Support, Soil Conditioning and Material Transport in Earth-Pressure-Balance and Hydro Shield Machines“. In Interaction Modeling in Mechanized Tunneling, 165–252. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-24066-9_4.

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AbstractThe excavation process in mechanised tunnelling consists of various technical components whose interaction enables safe tunnel driving. In reference to the existing geological and hydrogeological conditions, different types of face support principles are applied. In case of fine-grained cohesive soils, the face support is provided by Earth Pressure Balanced (EPB) machines, while the Slurry Shield (SLS) technology is adapted in medium-grained to coarse grained non-cohesive soils even under high groundwater pressure. For both machine techniques, the support medium (the excavated and conditioned soil (EPB) or the bentonite suspension (SLS)) needs to be adapted for the specific application. Within this chapter, the theoretical, experimental and numerical developments and results are presented concerning the fundamentals of face support in EPB and SLS tunnelling including the rheology of the support medium, the material transport and mixing process of the excavated soil and the added conditioning agent in the excavation chamber of an EPB shield machine as well as the constitutive models for investigations of the near field interactions between surrounding soil and advancing shield machine.

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Gorokhovski, Vikenti. „Advective Solute Transport Through Porous Media“. In Effective Parameters of Hydrogeological Models, 143–69. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03569-7_10.

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Holzbecher, Ekkehard. „Transport“. In Environmental Modeling, 57–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22042-5_3.

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Bear, Jacob. „Transport modeling“. In Groundwater Flow and Quality Modelling, 805–13. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2889-3_41.

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Muntean, Adrian. „Transport Fluxes“. In Continuum Modeling, 57–69. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22132-8_3.

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Faure, Jean-Baptiste. „Substance Transport“. In Modeling Software, 227–32. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118557891.ch19.

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Holzbecher, Ekkehard. „Transport Solutions“. In Environmental Modeling, 75–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22042-5_4.

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Giovangigli, Vincent. „Transport Coefficients“. In Multicomponent Flow Modeling, 97–117. Boston, MA: Birkhäuser Boston, 1999. http://dx.doi.org/10.1007/978-1-4612-1580-6_5.

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Holzbecher, Ekkehard. „Transport and Sorption“. In Environmental Modeling, 111–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22042-5_6.

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Holzbecher, Ekkehard. „Transport and Kinetics“. In Environmental Modeling, 133–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22042-5_7.

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Konferenzberichte zum Thema "Hydrogeological and transport modeling"

Kwong, S., und J. Small. „Reactive Transport Modelling of the Interaction of Fission Product Ground Contamination With Alkaline and Cementitious Leachates“. In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7334.

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The fission products Cs-137 and Sr-90 are amongst the most common radionuclides occurring in ground contamination at the UK civil nuclear sites. Such contamination is often associated with alkaline liquids and the mobility of these fission products may be affected by these chemical conditions. Similar geochemical effects may also result from cementitious leachate associated with building foundations and the use of grouts to remediate ground contamination. The behaviour of fission products in these scenarios is a complex interaction of hydrogeological and geochemical processes. A suite of modelling tools have been developed to investigate the behaviour of a radioactive plume containing Cs and Sr. Firstly the effects of sorption due to cementitious groundwater is modelled using PHREEQC. This chemical model is then incorporated into PHAST for the 3-D reactive solute transport modeling. Results are presented for a generic scenario including features and processes that are likely to be relevant to a number of civil UK nuclear sites. Initial results show that modelling can be a very cost-effective means to study the complex hydrogeological and geochemical processes involved. Modelling can help predict the mobility of contaminants in a range of site end point scenarios, and in assessing the consequences of decommissioning activities.

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Andersson, Johan, Kristina Skagius, Anders Winberg, Anders Stro¨m und Tobias Lindborg. „Site Descriptive Modeling as a Part of Site Characterization in Sweden: Concluding the Surface Based Investigations“. In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7062.

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The Swedish Nuclear Fuel and Waste Management Co., SKB, is currently finalizing its surface based site investigations for the final repository for spent nuclear fuel in the municipalities of O¨sthammar (the Forsmark area) and Oskarshamn (the Simpevar/Laxemar area). The investigation data are assessed into a Site Descriptive Model, constituting a synthesis of geology, rock mechanics, thermal properties, hydrogeology, hydrogeochemistry, transport properties and a surface system description. Site data constitute a wide range of different measurement results. These data both need to be checked for consistency and to be interpreted into a format more amenable for three-dimensional modeling. The three-dimensional modeling (i.e. estimating the distribution of parameter values in space) is made in a sequence where the geometrical framework is taken from the geological models and in turn used by the rock mechanics, thermal and hydrogeological modeling. These disciplines in turn are partly interrelated, and also provide feedback to the geological modeling, especially if the geological description appears unreasonable when assessed together with the other data. Procedures for assessing the uncertainties and the confidence in the modeling have been developed during the course of the site modeling. These assessments also provide key input to the completion of the site investigation program.

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Hartley, Lee, Dave Swan und Steven Baxter. „Characterization of Bedrock Hydrogeology at the Olkiluoto Site Using Surface Based and Underground Data“. In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59095.

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Posiva Oy is responsible for implementing the program for geological disposal of spent nuclear fuel in Finland. Olkiluoto in Eurajoki has been selected as the primary site for the repository, subject to further detailed characterization which is currently focused on the construction of an underground rock characterization and research facility (the ONKALO). An essential part of the site investigation program is analysis of groundwater flow and solute transport to depth by means of numerical flow modeling as part of the 2011 site descriptive model. Groundwater flow in the crystalline rocks at Olkiluoto takes place predominantly in the void space of the interconnected fractures in the bedrock. Many of the hydraulic characteristics of flow through such a system can be represented by hydrogeological Discrete Fracture Network (hydro-DFN) models, since they capture some of the details of fracture geometry, size, connectivity and openings. The paper describes how field data is used to derive such models, ultimately for use in safety assessment. Surface based site investigations at Olkiluoto include 53 vertical or inclined deep core drilled boreholes and 27 shallower sub-vertical boreholes. The characterization of fractures is a key objective. Fracture geometrical data (fracture positions and orientations) are determined from drill core mapping and/or borehole TV images, while hydraulic data are determined with the Posiva Flow Log (PFL). The PFL method is a geophysical logging device developed to detect continuously flowing fractures in sparsely fractured crystalline bedrock by means of difference flow logging, providing the effective transmissivity of individual fracture intercepts. A methodology developed originally in the Swedish program for constraining hydrogeological DFN models based on the PFL high resolution hydraulic test data has been extended to incorporate data from underground. The approach integrates deterministic models of the main hydro-structures with a stochastic model of the bedrock between. An exploration of conceptual uncertainties in the representation of the very scarce distribution of flow at repository depth, c. 400m, has been performed. This has been greatly informed by the analysis of 15 additional sub-horizontal boreholes drilled ahead of the ONKALO tunnel excavations. Conditions for PFL hydraulic tests performed in these pilot holes provide a lower detection limit and reveal the very low magnitude of groundwater flow that may be expected around the repository depositional volumes.

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Davis, Timothy, und Robert W. Taylor. „An Application of Electrical Anisotropy in Hydrogeological Modeling“. In Symposium on the Application of Geophysics to Engineering and Environmental Problems 1998. Environment and Engineering Geophysical Society, 1998. http://dx.doi.org/10.4133/1.2922590.

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Davis, Timothy, und Robert W. Taylor. „An Application Of Electrical Anisotropy In Hydrogeological Modeling“. In 11th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609-pdb.203.1998_101.

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Slave, Camelia. „HYDROGEOLOGICAL MODELING USING GIS TECHNIQUES IN THE DANUBE MEADOW“. In 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b22/s11.117.

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Christiansen, Anders Vest, und Esben Auken. „INTEGRATING GEOPHYSICS, GEOLOGY, AND HYDROLOGY FOR ENHANCED HYDROGEOLOGICAL MODELING“. In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2013. Environment and Engineering Geophysical Society, 2013. http://dx.doi.org/10.4133/sageep2013-141.1.

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Laichuthai, Rungwit, und Pizzanu Kanongchaiyos. „An Enhancement of Reeb Graph for Modeling Hydrogeological Information“. In 2006 International Conference on Cyberworlds. IEEE, 2006. http://dx.doi.org/10.1109/cw.2006.13.

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Baker, Nancy T. „NICK CRAWFORD’S INFLUENCE BEYOND KARST SCIENCE: CONTAMINANT TRANSPORT IN OTHER HYDROGEOLOGICAL SETTINGS“. In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-296992.

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Giertzuch, P., B. Brixel, A. Shakas, J. Doetsch und H. Maurer. „Improving Conceptual Flow and Transport Models in Fractured Rock Through GPR and Hydrogeological Data“. In NSG2021 1st Conference on Hydrogeophysics. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202120202.

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Berichte der Organisationen zum Thema "Hydrogeological and transport modeling"

Gregory Flach, Mary Harris, Susan Hubbard, Camelia Knapp, Mike Kowalsky, Maggie Millings, John Shafer und Mike Waddell. Integrated Hydrogeophysical and Hydrogeologic Driven Parameter Upscaling for Dual-Domain Transport Modeling. Office of Scientific and Technical Information (OSTI), Juni 2006. http://dx.doi.org/10.2172/895887.

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Shafer, John M. Final Technical Report - Integrated Hydrogeophysical and Hydrogeologic Driven Parameter Upscaling for Dual-Domain Transport Modeling. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1054156.

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Shafer, J. M., J. M. Rine, M. G. Waddell und R. C. Berg. 3D hydrogeologic characterization of the Marine Corps Air Station at Beaufort, South Carolina for aquifer vulnerability analysis and groundwater flow and transport modeling. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/299508.

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Mazzola, Carl A., und Robert P. Addis. Atmospheric Transport Modeling Resources. Office of Scientific and Technical Information (OSTI), März 1995. http://dx.doi.org/10.2172/1379491.

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Van Pelt, R., S. Lewis und R. Aadland. Hydrogeologic settings of A/M Area: Framework for groundwater transport. Book 2, Hydrogeological Plates. Office of Scientific and Technical Information (OSTI), März 1994. http://dx.doi.org/10.2172/69346.

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Zheng, Liange, Lianchong Li, Jonny Rutqvist, Hui Hai Liu und Jens Birkholzer. Modeling Radionuclide Transport in Clays. Office of Scientific and Technical Information (OSTI), Mai 2012. http://dx.doi.org/10.2172/1173163.

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Weatherly, Georges L. Modeling Coastal Sediment Transport Processes. Fort Belvoir, VA: Defense Technical Information Center, Mai 1994. http://dx.doi.org/10.21236/ada300247.

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ELIASSI, MEHDI, und SEAN A. MCKENNA. Long-Term Pumping Test at MIU Site, Toki, Japan: Hydrogeological Modeling and Groundwater Flow Simulation. Office of Scientific and Technical Information (OSTI), März 2003. http://dx.doi.org/10.2172/809104.

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Geyer, W. R., Christopher R. Sherwood und Timothy Keen. The Community Sediment Transport Modeling System. Fort Belvoir, VA: Defense Technical Information Center, Januar 2008. http://dx.doi.org/10.21236/ada496458.

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