scholarly journals Transient 3D simulation of 18O concentration by codes MODFLOW-2005 and MT3DMS in a regional-scale aquifer system: an example from the Estonian Artesian Basin

2020 ◽  
Vol 69 (3) ◽  
pp. 154 ◽  
Author(s):  
J Ivask ◽  
A Marandi ◽  
V Raidla ◽  
A Raukas ◽  
R Vaikmäe ◽  
...  
Keyword(s):  
Regional Scale ◽  
3D Simulation ◽  
Artesian Basin ◽  
Aquifer System

scholarly journals Enhancing geological and hydrogeological understanding of the Precipice Sandstone aquifer of the Surat Basin, Great Artesian Basin, Australia, through model inversion of managed aquifer recharge datasets

2019 ◽  
Vol 28 (1) ◽  
pp. 175-192
Author(s):  
Phil Hayes ◽  
Chris Nicol ◽  
Andrew D. La Croix ◽  
Julie Pearce ◽  
Sebastian Gonzalez ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Groundwater Resources ◽  
Regional Scale ◽  
Managed Aquifer Recharge ◽  
Gas Production ◽  
Aquifer Recharge ◽  
Model Inversion ◽  
Artesian Basin ◽  
Geological Interpretation ◽  
Great Artesian Basin

AbstractThe Precipice Sandstone is a major Great Artesian Basin aquifer in the Surat Basin, Queensland, Australia, which is used for water supply and production of oil and gas. This report describes use of observed groundwater pressure responses to managed aquifer recharge (MAR) at a regional scale to test recent geological descriptions of Precipice Sandstone extent, and to inform its hydrogeological conceptualisation. Since 2015, two MAR schemes have injected over 20 GL of treated water from coal seam gas production into the Precipice Sandstone, with pressure responses rapidly propagating over 100 km, indicating high aquifer diffusivity. Groundwater modelling of injection and inversion of pressure signals using PEST software shows the spatial variability of aquifer properties, and indicates that basin in-situ stresses and faulting exert control on permeability. Extremely high permeability, up to 200 m/day, occurs in heavily fractured regions with a dual-porosity flow regime. The broader-scale estimates of permeability approach an order of magnitude higher than previous studies, which has implications for the management of water resources in the Precipice Sandstone. Results also show the Precipice Sandstone to have broadly isotropic permeability. The results also support a recent geological interpretation of the Precipice Sandstone as having more limited lateral extent than initially considered. The study shows the effective use of MAR injection data to improve geological and hydrogeological understanding through groundwater model inversion. It also demonstrates the utility of combining hydrogeological and reservoir-engineer datasets in areas explored and developed for both groundwater resources and oil and gas resources.

Remote sensing of water storage variation in Dinaric karst

2020 ◽  
Author(s):  
Ines Vidmar ◽  
Mihael Brenčič
Keyword(s):  
Water Resource Management ◽  
Regional Scale ◽  
Water Storage ◽  
Cost Effective ◽  
In Situ Monitoring ◽  
Monitoring Networks ◽  
Dinaric Karst ◽  
Aquifer System ◽  
Terrestrial Water ◽  
The Difference

<p>Having shown potential for long-term monitoring of terrestrial water variation, satellite data from GRACE (Gravity Recovery and Climate Experiment) and its successor GRACE-FO (Follow-on) operating from 2002 could provide a cost-effective approach to water resource management in regions with scarce ground monitoring networks or in regions where representative in-situ monitoring is difficult to ensure, such as karstic areas. One such example is Dinaric karst, a large karstic aquifer system extending from Italy through Slovenia, Croatia, Bosnia-Herzegovina, Montenegro, Serbia to Albania. There, groundwater storage variation on a regional scale is difficult to infer from existing locally scattered data.</p><p>For that purpose, GRACE Level-3 gridded mass concentration terrestrial water storage (TWS) anomaly data was used. Gridded scale factors provided at 0.5° resolution based on land-hydrology models were considered as well. Spatial variability was analysed for the area of Dinaric karst and adjacent areas in Austria and Hungary owing to the resolution of the data. For preliminary validation, GRACE derived liquid water equivalent (LWE) thickness data was compared to data from available ground measurement points.</p><p>Based on the 2004-2009 average, the temporal data variability analysed for the period of March 2002 until September 2019 (containing 163 monthly data aggregates) showed variability of 17 cm to 83 cm with the average range amounting to 47 cm in the native GRACE resolution. According to the unscaled data, the variability is 29 cm to 54 cm with a mean of 43 cm. In both cases, higher amplitudes were observed at the southern parts of Dinaric karst. Weak negative temporal trend of water storage anomalies is present in all analysed land grid cells showing the difference of less than 10 cm during the entire measurement period, while the average monthly change in total water storage is around 4 cm.</p>

Sulphur isotope composition of dissolved sulphate in the Cambrian–Vendian aquifer system in the northern part of the Baltic Artesian Basin

2014 ◽  
Vol 383 ◽  
pp. 147-154 ◽  
Author(s):  
Valle Raidla ◽  
Kalle Kirsimäe ◽  
Jüri Ivask ◽  
Enn Kaup ◽  
Kay Knöller ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Sulphur Isotope ◽  
Artesian Basin ◽  
Aquifer System ◽  
Sulphur Isotope Composition ◽  
The Baltic

scholarly journals Environmental isotopes and noble gas ages of the deep groundwater with coupled flow modelling in the Baltic artesian basin

2021 ◽  
Vol 61 (1) ◽  
Author(s):  
R. Mokrik ◽  
V. Samalavičius ◽  
M. Gregorauskas ◽  
M. Bujanauskas
Keyword(s):  
Noble Gas ◽  
Sedimentary Cover ◽  
Regional Scale ◽  
Environmental Isotopes ◽  
Age Dating ◽  
Coupled Flow ◽  
Deep Groundwater ◽  
Artesian Basin ◽  
Deep Aquifers ◽  
The Baltic

In this study, modelled groundwater actual flow times in intermediate and deep aquifers, covered by regional scale impermeable aquitards, were compared with 4He and 81Kr age dating results. To improve the reliability of the steady state 3D groundwater flow model, the isotopic ages of deep groundwater were compared to the MODPATH modelled travel times. The highest helium values in groundwater reservoirs coincide with fault zones in the crystalline basement and sedimentary cover near Rapakivi granite massifs. Insights into isotope-geochemical anomalies of the Baltic Artesian Basin intermediate and deep groundwater support their main distribution peculiarities in the flow path towards the Baltic Sea coast lowland and seabed depression as the regional groundwater discharge area.

scholarly journals Characterization of extractable metals from the aquifers with arsenic contamination in the Tsengwen Creek, Taiwan

2014 ◽  
Vol 9 (No. 2) ◽  
pp. 66-76
Author(s):  
H.-Y. Lu
Keyword(s):  
Groundwater Resources ◽  
Regional Scale ◽  
Arsenic Contamination ◽  
Shallow Aquifer ◽  
Deep Aquifer ◽  
Aquifer System ◽  
Creek Watershed ◽  
Groundwater Hydrochemistry ◽  
Extractable Metals

Arsenic contamination in groundwater is a common groundwater problem worldwide. To manage groundwater resources effectively, it is crucial to determine the arsenic source. Taiwan’s Tsengwen Creek watershed is one of the known areas for groundwater arsenic contamination. Water-rock interactions are evaluated on a regional scale. A conceptual hydrogeological framework is first established based on groundwater hydrochemistry. The local aquifer system can be categorized into high-arsenic deep aquifer and low-arsenic shallow aquifer. The average geochemistry of sediments indicates that arsenic and heavy metals are not significantly enriched in the deeper aquifer on the scale of the whole watershed. Therefore, arsenic contamination in the deeper groundwater of the Tsengwen Creek watershed is not simply source-controlled. However, the Fe-Mn oxides in sediments contain slightly more arsenic in the deep aquifer. The long residence time of groundwater could magnify the enrichment and cause natural arsenic contamination in the deep aquifer.

scholarly journals Evidence for groundwater mixing at Freeling Spring Group, South Australia

2019 ◽  
Vol 28 (1) ◽  
pp. 313-323 ◽  
Author(s):  
Todd Halihan ◽  
Andrew Love ◽  
Mark Keppel ◽  
Meghan K. M. Dailey ◽  
Volmer Berens ◽  
...  
Keyword(s):  
South Australia ◽  
Spring Water ◽  
The Body ◽  
Porous Media Flow ◽  
Electrical Resistivity Imaging ◽  
Water Sampling ◽  
Electrically Conductive ◽  
Artesian Basin ◽  
Aquifer System ◽  
Resistivity Data

AbstractWater sampling at springs that are a part of the Freeling Spring Group, South Australia, was used along with electrical resistivity imaging (ERI) data to evaluate the sources and pathways for groundwater to the springs and to find evidence of mixing between the Great Artesian Basin (GAB) aquifer system (Algebuckina Sandstone, Cadna-owie Formation and lateral equivalents) and waters from the adjacent mountain block basement (MB) aquifer. Five springs and a well were used to evaluate spring chemistry; multi-electrode resistivity data were collected along three orientations over the Freeling Spring site. The resistivity data indicate three independent electrically conductive curvilinear features connected to the spring. These features are evidence of mixing at the spring vent similar to what would be predicted from traditional hydraulic flownets. The chemistry of the spring water samples indicates that the water emanating from the Freeling Spring Group is a mixture of waters from both the GAB and the MB aquifers, supporting the geophysical evidence. The data suggest mixing occurs along a fracture in the body of the MB and porous media flow in the GAB beds, but the system is dominated by the GAB flow, which provides approximately 90% of the discharge.

scholarly journals Conceptual and numerical modeling approach of the Guarani Aquifer System

2013 ◽  
Vol 17 (1) ◽  
pp. 295-314 ◽  
Author(s):  
L. Rodríguez ◽  
L. Vives ◽  
A. Gomez
Keyword(s):  
Hydraulic Conductivity ◽  
Water Balance ◽  
Water Budget ◽  
Flow System ◽  
Regional Scale ◽  
Early Years ◽  
Scale Model ◽  
Aquifer System ◽  
Guarani Aquifer ◽  
The Impact

Abstract. In large aquifers, relevant for their considerable size, regional groundwater modeling remains challenging given geologic complexity and data scarcity in space and time. Yet, it may be conjectured that regional scale groundwater flow models can help in understanding the flow system functioning and the relative magnitude of water budget components, which are important for aquifer management. The Guaraní Aquifer System is the largest transboundary aquifer in South America. It contains an enormous volume of water; however, it is not well known, being difficult to assess the impact of exploitation currently used to supply over 25 million inhabitants. This is a sensitive issue because the aquifer is shared by four countries. Moreover, an integrated groundwater model, and therefore a global water balance, were not available. In this work, a transient regional scale model for the entire aquifer based upon five simplified, equally plausible conceptual models represented by different hydraulic conductivity parametrizations is used to analyze the flow system and water balance components. Combining an increasing number of hydraulic conductivity zones and an appropriate set of boundary conditions, the hypothesis of a continuous sedimentary unit yielded errors within the calibration target in a regional sense. The magnitude of the water budget terms resulted very similar for all parametrizations. Recharge and stream/aquifer fluxes were the dominant components representing, on average, 84.2% of total inflows and 61.4% of total outflows, respectively. However, leakage was small compared to stream discharges of main rivers. For instance, the simulated average leakage for the Uruguay River was 8 m3 s−1 while the observed absolute minimum discharge was 382 m3 s−1. Streams located in heavily pumped regions switched from a gaining condition in early years to a losing condition over time. Water is discharged through the aquifer boundaries, except at the eastern boundary. On average, pumping represented 16.2% of inflows while aquifer storage experienced a small overall increment. The model water balance indicates that the current rate of groundwater withdrawals does not exceed the rate of recharge in a regional sense.

scholarly journals Assessment of the Impact of the Spatial Extent of Land Subsidence and Aquifer System Drainage Induced by Underground Mining

2020 ◽  
Vol 12 (19) ◽  
pp. 7871
Author(s):  
Artur Guzy ◽  
Agnieszka A. Malinowska
Keyword(s):  
Land Subsidence ◽  
Indirect Effects ◽  
Underground Mining ◽  
Regional Scale ◽  
Spatial Extent ◽  
Direct Effects ◽  
Hydrogeological Model ◽  
Mining Operations ◽  
Aquifer System ◽  
The Impact

The environmental impact assessment of underground mining usually includes the direct effects of exploitation. These are damage to rock mass and land subsidence. Continuous dewatering of the aquifer system is, however, necessary to carry out underground mining operations. Consequently, the drainage of the aquifer system is observed at a regional scale. The spatial extent of the phenomenon is typically much wider than the direct impact of the exploitation. The research presented was, therefore, aimed at evaluating both the direct and the indirect effects of underground mining. Firstly, the spatial extent of land subsidence was determined based on the Knothe theory. Secondly, underground mining-induced drainage of the aquifers was modeled. The 3D finite-difference hydrogeological model was constructed based on the conventional groundwater flow theory. The values of model hydrogeological parameters were determined based on literature and empirical data. These data were also used for model calibration. Finally, the results of the calculations were compared successfully with the field data. The research results presented indicate that underground mining’s indirect effects cover a much larger area than direct effects. Thus, underground mining requires a broader environmental assessment. Our results can, therefore, pave the way for more efficient management of groundwater considering underground mining.

Sign in / Sign up

Export Citation Format

Share Document