scholarly journals Development of three dimensional hydrogeological model and estimation of groundwater storage in Japanese islands.

2011 ◽  
Vol 53 (4) ◽  
pp. 357-377 ◽  
Author(s):  
Masaru KOSHIGAI ◽  
Atsunao MARUI ◽  
Narimitsu ITO ◽  
Takuya YOSHIZAWA
Keyword(s):  
Three Dimensional ◽  
Hydrogeological Model ◽  
Groundwater Storage ◽  
Japanese Islands

3D hydrogeological modeling of Deep Geological Disposal in the Nizhnekansky Rock massif

2020 ◽  
Author(s):  
Georgii Neuvazhaev ◽  
Alexander Rastorguev ◽  
Oleg Morozov ◽  
Ivan Kapyrin ◽  
Fedor Grigorev
Keyword(s):  
Groundwater Flow ◽  
Three Dimensional ◽  
Model Verification ◽  
Structural Elements ◽  
Three Dimensional Model ◽  
Hydrogeological Model ◽  
Transport Models ◽  
Geological Disposal ◽  
Flow And Transport ◽  
Deep Geological Disposal

<p>Russian Federation has a selected site for Deep Geological Disposal in the Nizhnekansky massif (Krasnoyarsk territory). The current work is devoted to justification of its suitability. One of the main parts of the safety case of is the prediction of radionuclides migration in the environment which requires development and application of groundwater flow and transport models. This work presents the evolution of the hydrogeological model.</p><p>The granitoid rock of Nizhnekansky massif is complicated by presence of such geological structural elements as dykes, faults and crushing zones which influence significantly permeability features. Currently all available geological data are consolidated with the use of the MICROMINE program into a structural geological model. The three-dimensional model of the distribution of the main structural elements in the area of the DGD site is more detailed. The corresponding dykes appear to have a north trend and a steep fall (about 70 ° east).</p><p>Using the geometry of structural elements one can assess their role in the structure of groundwater flow on the basis of profile model. Verification of the model was carried out on the basis of measured hydraulic heads.</p><p>The preliminary calculations showed that including into the model additional structural elements (to a greater extent dykes and crushing zones) leads to a better matching between observed and model heads. This implies the need to take into account the structural elements  more accurately. The migration of a conservative tracer was calculated as well using the developed flow model.</p><p>Moreover, the heterogeneity near the Deep Geological Disposal is three-dimensional in nature and it is impossible to implement it accurately in a two-dimensional setting without approximations. This requires three-dimensional modeling, such 3D numerical flow and transport models are developed using the GeRa code.</p>

scholarly journals Combining implicit geological modeling, field surveys, and hydrogeological modeling to describe groundwater flow in a karst aquifer

2020 ◽  
Vol 28 (8) ◽  
pp. 2779-2802 ◽  
Author(s):  
Fernando M. D’Affonseca ◽  
Michael Finkel ◽  
Olaf A. Cirpka
Keyword(s):  
Groundwater Flow ◽  
Karst Aquifer ◽  
Three Dimensional ◽  
Tracer Tests ◽  
Spring Discharge ◽  
Geological Modeling ◽  
Hydrogeological Model ◽  
Geological Interpretation ◽  
Elevation Data ◽  
Contact Data

AbstractIn three-dimensional (3-D) implicit geological modeling, the bounding surfaces between geological units are automatically constructed from lithological contact data (position and orientation) and the location and orientation of potential faults. This approach was applied to conceptualize a karst aquifer in the Middle Triassic Muschelkalk Formation in southwest Germany, using digital elevation data, geological maps, borehole logs, and geological interpretation. Dip and strike measurements as well as soil-gas surveys of mantel-borne CO2 were conducted to verify the existence of an unmapped fault. Implicit geological modeling allowed the straightforward assessment of the geological framework and rapid updates with incoming data. Simultaneous 3-D visualizations of the sedimentary units, tectonic features, hydraulic heads, and tracer tests provided insights into the karst-system hydraulics and helped guide the formulation of the conceptual hydrogeological model. The 3-D geological model was automatically translated into a numerical single-continuum steady-state groundwater model that was calibrated to match measured hydraulic heads, spring discharge rates, and flow directions observed in tracer tests. This was possible only by introducing discrete karst conduits, which were implemented as high-conductivity features in the numerical model. The numerical groundwater flow model was applied to initially assess the risk from limestone quarrying to local water supply wells with the help of particle tracking.

Hydrogeological modelling of Olkaria domes geothermal field to predict ground subsidence

2021 ◽  
pp. 25-38
Author(s):  
Solomon Kahiga ◽  
Nicholas Mariita ◽  
Njenga Mburu
Keyword(s):  
Cross Sections ◽  
Surface Deformation ◽  
Three Dimensional ◽  
Computer Software ◽  
Geothermal Field ◽  
Ground Subsidence ◽  
Well Testing ◽  
Resource Exploitation ◽  
Hydrogeological Model ◽  
Software Production

Ground subsidence studies have been done on Olkaria geothermal field conventionally by comparing levels on benchmarks over years. Interferometric synthetic aperture radar (InSAR) systems have also been used to map surface deformation of small spatial extent. For the prediction of future dynamics of land subsidence in Olkaria due to geothermal resource exploitation, a hydrogeological conceptual model has been developed. In this model, hydrologic geothermal fluid properties are analysed and a relationship between the reservoir and geology of the wells established, subsidence is computed numerically. The model takes into account the hydrogeological condition of Olkaria geothermal field. Hydrological reservoir parameters are computed from well testing data. The study considers the Injectivity indices of the various wells under study as pre-computational indicator of the expected subsidence extents. Both two- and three-dimensional geological cross-sections are modelled with the rockworks software by inputting stratigraphic data for Olkaria domes. Geological simulations are used to study subsidence by assigning the ground formation with virtual material that deformed according to some essential relations in Rockworks computer software. Production zones are determined by a comparison between the well properties and corresponding well geology. Subsidence is then computed by the Tezarghi’s modified equation. Cumulative subsidence figures from the computation are in the range of 0.095-0.537m, without any reinjection. Computed values are then mapped in ArcGIS to develop a representative subsidence map. By application of these modelling and numerical computation methods, ground subsidence was effectively predicted using the five selected wells in Olkaria domes field. The hydrogeological model developed, and mapping is an important tool in the planning and development of a reinjection schedule and in subsidence mitigation. Subsidence prediction also is important in design of infrastructure which will be strong enough to resist the forces caused by subsidence.

Configuration of the Moho discontinuity beneath the Japanese Islands derived from three-dimensional seismic tomography

2017 ◽  
Vol 710-711 ◽  
pp. 97-107 ◽  
Author(s):  
Makoto Matsubara ◽  
Hiroshi Sato ◽  
Tatsuya Ishiyama ◽  
Anne Van Horne
Keyword(s):  
Seismic Tomography ◽  
Three Dimensional ◽  
Moho Discontinuity ◽  
Japanese Islands

scholarly journals From Lithological Modelling to Groundwater Modelling: A Case Study in the Tiber River Alluvial Valley

2021 ◽  
Author(s):  
Cristina Di Salvo ◽  
Marco Mancini ◽  
Massimiliano Moscatelli ◽  
Maurizio Simionato ◽  
Gian Paolo Cavinato ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Stationary Regime ◽  
Regional Government ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Hydrogeological Model ◽  
Alluvial Deposits ◽  
Tiber River

This study presents the results of a research project financed by the Lazio Regional Government. The research focused on defining an integrated model of recent alluvial deposits in the Tiber River. To achieve this objective, geological boreholes were made to monitor the aquifer and in situ and laboratory tests carried out. The data obtained was used to detail stratigraphic aspects and improve the comprehension of water circulation beneath the recent alluvial deposits of the Tiber River in the urban area of Rome, between the Ponte Milvio bridge and the Tiber Island. The stratigraphic intervals recognised in the boreholes were parameterised based on their litho-technical characteristics. The new data acquired, and integrated with existing data in the CNR IGAG database, made it possible to produce a three-dimensional model of the lithologies in the study area.The model of the subsoil, simplified for applied reasons, was described in hy-drostratigraphic terms: three different lithotypes were subjected to piezometric levels monitor-ing. Finally, the research generated a numerical hydrological level in a stationary regime. In general, this study demonstrates how a numerical hydrogeological model calibrated by piezo-metric monitoring data can support the construction of a geological model, discarding or con-firming certain hypotheses and suggesting other means of reconstructing sedimentary bodies.

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