Bibliografie tematiche / Aquifers

Letteratura scientifica selezionata sul tema "Aquifers"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 2 marzo 2023

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Articoli di riviste sul tema "Aquifers"

1

Hera-Portillo, África de la, Julio López-Gutiérrez, Beatriz Mayor, Elena López-Gunn, Hans Jørgen Henriksen, Ryle Nørskov Gejl, Pedro Zorrilla-Miras e Pedro Martínez-Santos. "An Initial Framework for Understanding the Resilience of Aquifers to Groundwater Pumping". Water 13, n. 4 (17 febbraio 2021): 519. http://dx.doi.org/10.3390/w13040519.

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Abstract (sommario):
Groundwater stored in aquifers experiences a wide variety of natural, induced and/or anthropogenic disturbances. Among them, groundwater extraction is the main disturbance that affects most of the aquifers in the world. Aquifer’s resilience, understood as the potential of the aquifer to sustain disturbances on the long term and to guarantee essential qualities and functions, provides a key tool when assessing sustainable groundwater management alternatives. The aim of this work is to illustrate an aquifer resilience framework that can support groundwater sustainable management. A theoretical framework is based on the identification of the key variables that parameterize the quantitative and qualitative responses of the groundwater flow system to pumping. An example from the literature based in Denmark is provided as an illustration of the proposed framework. The results show that long-term high quality data are essential to make a step further in aquifers dynamic responses. The quantitative understanding of the aquifer’s behavior before, during and after groundwater extraction provides a valuable source of information in order to identify thresholds of change (tipping points, transitions or regime shifts) which could permit pro-active groundwater management decisions. Moreover, a deeper understanding on the aquifer’s dynamics provides useful information in order to avert threats that may put the sustainability of the system at risk.
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2

Maulana, Fivry Wellda, e Arie Noor Rakhman. "Aplikasi Geofisika Terpadu Untuk Penelitian Potensi Air Tanah Aquifer Batu Pasir Di Alasombo, Indonesia". Jurnal Multidisiplin Madani 2, n. 1 (30 gennaio 2022): 511–24. http://dx.doi.org/10.54259/mudima.v2i1.418.

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The purpose of this study was to determine the potential of groundwater in Alasombo, Weru District, Sukoharjo Regency, Indonesia. The investigation has been carried out using geophysical methods that are integrated with surface geological data to obtain an interpretation of the hydrogeological control of the aquifer. The lithology of the aquifer is dominated by sandstone which controls its role as 2 types of aquifers, namely unconfined aquifers or free aquifers and semi-confined aquifers or semi-free aquifers. The geoelectrical section shows that the groundwater-carrying layer that functions as an aquifer is the sandstone layer in the second layer and sandstone in the base layer. As an artesian aquifer or a confined aquifer, sandstone aquifers have a water volume between 31.5 to 260 m3/day, in a northwest-southeast direction. In terms of the quality of the conductivity value of water in the field, below 1500 µs/cm is freshwater type groundwater that can be recommended as a source of clean water.
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3

Luo, Zhaoyang, Jun Kong, Chengji Shen, Pei Xin, Chunhui Lu, Ling Li e David Andrew Barry. "Effects of aquifer geometry on seawater intrusion in annulus segment island aquifers". Hydrology and Earth System Sciences 25, n. 12 (23 dicembre 2021): 6591–602. http://dx.doi.org/10.5194/hess-25-6591-2021.

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Abstract. Seawater intrusion in island aquifers was considered analytically, specifically for annulus segment aquifers (ASAs), i.e., aquifers that (in plan) have the shape of an annulus segment. Based on the Ghijben–Herzberg and hillslope-storage Boussinesq equations, analytical solutions were derived for steady-state seawater intrusion in ASAs, with a focus on the freshwater–seawater interface and its corresponding watertable elevation. Predictions of the analytical solutions compared well with experimental data, and so they were employed to investigate the effects of aquifer geometry on seawater intrusion in island aquifers. Three different ASA geometries were compared: convergent (smaller side is facing the lagoon, larger side is the internal no-flow boundary and flow converges towards the lagoon), rectangular and divergent (smaller side is the internal no-flow boundary, larger side is facing the sea and flow diverges towards the sea). Depending on the aquifer geometry, seawater intrusion was found to vary greatly, such that the assumption of a rectangular aquifer to model an ASA can lead to poor estimates of seawater intrusion. Other factors being equal, compared with rectangular aquifers, seawater intrusion is more extensive, and watertable elevation is lower in divergent aquifers, with the opposite tendency in convergent aquifers. Sensitivity analysis further indicated that the effects of aquifer geometry on seawater intrusion and watertable elevation vary with aquifer width and distance from the circle center to the inner arc (the lagoon boundary for convergent aquifers or the internal no-flow boundary for divergent aquifers). A larger aquifer width and distance from the circle center to the inner arc weaken the effects of aquifer geometry, and hence differences in predictions for the three geometries become less pronounced.
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4

Tsepav, Matthew Tersoo, Aliyu Yahaya Badeggi, Obaje Nuhu George, Usman Yusuf Tanko e Ibrahim Samuel Ibbi. "On the Use of Electrical Resistivity Method in Mapping Potential Sources and Extent of Pollution of Groundwater Systems in Lapai Town, Niger State, Nigeria." Journal of Physics: Theories and Applications 5, n. 1 (30 marzo 2021): 18. http://dx.doi.org/10.20961/jphystheor-appl.v5i1.51563.

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<p>Electrical resistivity method employing the Schlumberger array was used to occupy forty four (44) vertical electrical sounding points in Lapai town with the aim of determining the depth to aquifers, aquifer thicknesses and aquifer protective capacity. The G41 Geotron resistivity meter was used in obtaining the apparent resistivity data which was processed using Interpex 1XD resistivity interpretation software. The results revealed four lithologic sections which include top lateritic soil, sandy clay, fractured basement and fresh basement. Both confined and unconfined aquifers were identified within the area, with four classes of aquifer proactive capacities as high, moderate, weak and poor. While the aquifer at VES 20 was highly protected, twenty other aquifers were moderately protected, eight others had weak protection and fifteen aquifers were poorly protected. The aquifers were generally of good thicknesses and at varying reasonable depths, making them good reservoirs of water in appreciable quantity. The average aquifer thickness was estimated to be 48.36m while the average depth to aquifers was estimated to be 56.68m.</p>
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5

Salvador, N., J. P. Monteiro, R. Hugman, T. Y. Stigter e E. Reis. "Quantifying and modelling the contribution of streams that recharge the Querença-Silves aquifer in the south of Portugal". Natural Hazards and Earth System Sciences 12, n. 11 (6 novembre 2012): 3217–27. http://dx.doi.org/10.5194/nhess-12-3217-2012.

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Abstract. The water balance of the mesocenozoic aquifers of the Algarve, in the south of Portugal has traditionally been estimated considering only direct ("autogenic") recharge from rainfall occurring in the area of the aquifers. Little importance has been attributed to so-called allogenic recharge, originating from streambed infiltration from runoff generated outside the aquifers, particularly in the Palaeozoic rocks to the north where runoff is high. The Querença-Silves (QS) aquifer is the most important aquifer of the region both for irrigation and public water supply. Several important and sensitive surface/groundwater ecotones and associated groundwater dependent ecosystems exist at the springs of the natural discharge areas of the aquifer system. A numerical flow model has been in constant development over the last few years and currently is able to reproduce the aquifer's responses to estimated direct recharge and abstraction for the years 2001–2010. However, recharge calculations for the model do not take into account allogenic recharge infiltration along influent reaches of streams. The quantification of allogenic recharge may further improve the assessment of water availability and exploitation risks. In this paper an attempt is made to quantify the average annual contribution of allogenic recharge to the QS aquifer, based on monitoring data of the principal water courses that cross the aquifer system. Significant uncertainties related to surface runoff generated within the aquifer area, as well as areal recharge were identified and the consequences for the optimization of spatial distribution of transmissivity in the groundwater flow model are also addressed.
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6

Zhang, Yi, e Dong Ming Guo. "Temperature Field of Single-Well Aquifer Thermal Energy Storage in Sanhejian Coal Mine". Advanced Materials Research 415-417 (dicembre 2011): 1028–31. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1028.

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The technology of aquifer thermal energy storage(ATES) is an energy-saving technology which can provide a solution to energy shortages and resources expasion. The first key point of this technology is whether the aquifer can be use to store energy. In this paper, taking Sanhejian Coal Mine as an example, we choose Quaternary upper loose sandy porosity confined aquifer to bottom clayed glavel porosity confined aquifer as aquifers thermal energy storage, to discuss whether the aquifers can be used to store energy. The simulation results of aquifer temperature field show that the selected aquifers reach the goal of energy storage. And with the same irrigation flow, the lower the temperature, the more the cold water and the larger the low temperature region in aquifers thermal energy storage. With the same irrigation temperature, the lager the irrigation flow the more the cold water and the larger the low temperature region in aquifers thermal energy storage.
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Zhang, Yi, e Dong Ming Guo. "Temperature Field of Doublet-Wells Aquifer Thermal Energy Storage in Sanhejian Coal Mine". Advanced Materials Research 430-432 (gennaio 2012): 746–49. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.746.

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Abstract (sommario):
Utilizating of tube-well irrigation, the technology of aquifer thermal energy storage (ATES) store rich cold energy in winter and cheap warm energy in summar into aquifers seasonally. In this paper, taking Sanhejian Coal Mine as an example, we discuss that with the same pumping and irrigation flow in doublet wells, distribution and change of temperature field in aquifers both at the end of energy storage and after the period of no pumping and no irrigation. The simulation results of aquifer temperature field show that 2~10°C water body of aquifers is decreasing in the period of no pumping and no irrigation, but it is only a small reduction with a stable trend. And after the period of no pumping and no irrigation, about 11°C water body of aquifers stores steadily in the aquifer, so the selected aquifers is suitable and its effect of energy storage is good.
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8

Singh, K. P. "Nonlinear estimation of aquifer parameters from surficial resistivity measurements". Hydrology and Earth System Sciences Discussions 2, n. 3 (10 giugno 2005): 917–38. http://dx.doi.org/10.5194/hessd-2-917-2005.

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Abstract (sommario):
Abstract. The present study is focused on an examination of the correlation relationships for hydraulic permeability and transmissivity with electrical resistivity in a range of fractured and alluvial aquifers. The observed permeability data for fractured rock aquifers at some locations is correlated nonlinearly with electrical resistivity of the aquifers estimated from resistivity sounding data and it is found that the permeability of the aquifer in this region exponentially decreases with increase in resistivity. Permeability of the hard rock aquifer within the weathered zone and alluvium aquifers increases exponentially with increase in resistivity, and transmissivity decreases exponentially. However, in case of fracture rock and sandwiched aquifers, transmissivity increases exponentially with increase in resistivity. An attempt has been made to find general functional relationship between hydraulic parameters and resistivity of the aquifer, and therefore, published and observed data from India and other parts of the world has been taken under consideration. It is found that for fracture rock and alluvium aquifers, permeability and the transmissivity are best defined as the exponential functions of aquifer resistivity. The application of electrical parameters obtained from resistivity data for evaluation of hydraulic parameters has been demonstrated in detail within the Osmania University Campus, Hyderabad (India). The empirical relations between aquifer parameters and resistivity are established for transforming resistivity distribution into permeability and transmissivity of the aquifer. The information thus obtained from resistivity data on permeability of the aquifer and transmissivity distribution in the study area can be used for optimal use and assessment of water resources.
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Jaka Yuwana, Ngudi Aji, Nora Herdiana Pandjaitan e Roh Santoso Budi Waspodo. "Prediksi cadangan air tanah berdasarkan hasil pendugaan geolistrik di Kabupaten Grobogan, Jawa Tengah". JURNAL SUMBER DAYA AIR 13, n. 1 (27 dicembre 2017): 23–36. http://dx.doi.org/10.32679/jsda.v13i1.139.

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One of the solutions for water shortage in Grobogan District is groundwater utilization. Excessive groundwater pumping will decrease groundwater level and trigger a landsubsidence. It is necessary to conduct hydrogeological study to determine the groundwater storage in this area. The purpose of this research were to determine the hydrogeological conditions, aquifer characteristics and potential of groundwater storage in Grobogan district. This research used geoelectrical method to identify rock characteristics. The results showed that the geological formation in Grobogan district consisted of Qa, Tmpk, Tmpl, Tps, Tmw and Qp. Grobogan district had 5 aquifers system, there are: poorly productive aquifers, moderately productive aquifers, locally productive aquifers, extensive productive aquifers and region without exploitable groundwater. The aquifer layer consisted of sand, marl sandy, silty sand and calcareous sand. The unconfined aquifer was located at 1,2 - 58 m from soil surface with average thickness of 13,54 m and the hydraulic conductivity of 3,54 m/day. The confined aquifer depth can be estimated between 29 - 174 m from soil surface with average thickness of 37,4 m and the hydraulic conductivity of 3,87 m/day.The predicted groundwater storage in Grobogan district of unconfined aquifer was 401,33 l/sec and confined aquifer was 1.804,95 l/sec.
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Camuñas Palencia, Carlos, Miguel Mejías Moreno, Jorge Hornero Díaz, Fernando Ruíz Bermudo e Olga García Menéndez. "Deep aquifers as strategic groundwater reservoir in Spain". BOLETÍN GEOLÓGICO Y MINERO 133, n. 3 (settembre 2022): 7–26. http://dx.doi.org/10.21701/bolgeomin/133.3/001.

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The objective of this paper is to establish a definition of deep aquifers, develop a methodological proposal to help select them as strategic groundwater reserves and develop a first inventory of deep aquifers in peninsular Spain, organized by hydrographic districts. The basic premises followed to consider a permeable formation as a deep aquifer are: water table depth greater than 300 m in free aquifers or the top of the permeable formation in the case of confined aquifers. A deep aquifer is also considered to be the lower horizon of very thick aquifers (from 300 m), from which the most superficial horizon is used. The definition of the potentially favorable areas and the initial characterization is based on a compilation and synthesis of geological and hydrogeological information, structured in 5 large blocks: location and identification, geology, hydrogeology, current status and bibliography. For its evaluation, a flowchart has been proposed with the basic lines of the evaluation process. The relevant aspects for suitability would be: stratigraphy and structural geology, prior knowledge of the conceptual model and water renewal, quality, viability of exploitation, effects, final knowledge, and management and governance. The final result allows the aquifer to be classified into three categories: strategic groundwater reserve, punctual reserve or non-viable reserve. The inventory carried out encompasses a total of 64 deep aquifers located in 13 basin districts. Finally, as example, three deep aquifers are presented: Amblés Valley, Madrid detritic aquifer and El Maestrazgo.
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Tesi sul tema "Aquifers"

1

Chen, Yiming. "Aquifer storage and recovery in saline aquifers". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52266.

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Abstract (sommario):
Aquifer storage and recovery (ASR) is a particular scheme of artificial recharge of groundwater by injecting fresh water into aquifers and subsequently recovering the stored water during times of peak demand or extended drought. In the era of combating climate change, ASR, as an effective means for water reuse and sustainable management of water resources in concert with the natural environment, represents a huge opportunity for climate change adaptation to mitigate water availability stress.The success of an ASR scheme is quantified by the recovery efficiency (RE), defined as the volume of stored water that can be recovered for supply purposes divided by the total volume injected. It is not uncommon that RE may be significantly lower than 100% because of the water quality changes as a consequence of the mixing between the injected water and native groundwater and the interaction between injected water and soil. Thus, the key of a successful ASR scheme is (1) to select appropriate aquifers and (2) to design optimal operational processes to build up a bubble of injected water with minimized negative impact from such mixing and interaction. To achieve this, this thesis develops an integrated knowledge base with sound interdisciplinary science and understanding of the mixing processes under operational ASR management in aquifers with various hydrogeological conditions. Analytical and numerical modeling are conducted to improve the scientific understanding of mixing processes involved in ASR schemes and to provide specific technical guidance for improving ASR efficiency under complex hydrogeological conditions. (1) An efficient approach is developed to analytically evaluate solute transport in a horizontal radial flow field with a multistep pumping and examine the ASR performance in homogeneous, isotropic aquifer with advective and dispersive transport processes. (2) Numerical and analytical studies are conducted to investigate the efficiency of an ASR system in dual-domain aquifers with mass transfer limitations under various hydrogeological and operational conditions. Simple and effective relationships between transport parameters and ASR operational parameters are derived to quantify the effectiveness and ascertain the potential of ASR systems with mass transfer limitations.(3) Effects of hydrogeological and operational parameters on ASR efficiency are assessed in homogeneous/stratified, isotropic/anisotropic coastal aquifers. Effects of transverse dispersion are particularly investigated in such aquifers.(4) Finally, we test and study an innovative ASR scheme for improving the RE in brackish aquifers: injection through a fully-penetrated well and recovery through a partially-penetrated well.
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Artiola, Janick. "Arizona Aquifers". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2013. http://hdl.handle.net/10150/298168.

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Video is available on the UofAZCALS YouTube channel.
About 5% of Arizona's population depends on private wells for fresh water and more than 40% of our annual water use comes from Arizona's aquifers. Following a brief introduction to regulations, requirements and equipment used for drilling a private well in Arizona, this video presents the geologic origins of Arizona's aquifer materials with illustrations and pictures of AZ aquifers. Finally, aquifers are ranked by their ability to store and produce water.
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Payne, Scott Marshall. "Classification of aquifers". Diss., [Missoula, Mont.] : The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-03082010-112041.

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4

Sun, Xiaobin. "Testing and evaluation of artesian aquifers in Table Mountain Group aquifers". University of the Western Cape, 2014. http://hdl.handle.net/11394/4369.

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Philosophiae Doctor - PhD
The Table Mountain Group (TMG) Aquifer is a huge aquifer system which may provide large bulk water supplies for local municipalities and irrigation water for agriculture in the Western Cape and Eastern Cape Provinces in South Africa. In many locations, water pressure in an aquifer may force groundwater out of ground surface so that the borehole drilled into the aquifer would produce overflow without a pump. Appropriate testing and evaluation of such artesian aquifers is very critical for sound evaluation and sustainable utilization of groundwater resources in the TMG area. However, study on this aspect of hydrogeology in TMG is limited. Although the flow and storage of TMG aquifer was conceptualised in previous studies, no specific study on artesian aquifer in TMG was made available. There are dozens of flowing artesian boreholes in TMG in which the pressure heads in the boreholes are above ground surface locally. A common approach to estimate hydraulic properties of the aquifers underneath is to make use of free-flowing and recovery tests conducted on a flowing artesian borehole. However, such testing approach was seldom carried out in TMG due to lack of an appropriate device readily available for data collection. A special hydraulic test device was developed for data collection in this context. The test device was successfully tested at a flowing artesian borehole in TMG. The device can not only be used to measure simultaneous flow rate and pressure head at the test borehole, but also be portable and flexible for capturing the data during aquifer tests in similar conditions like artesian holes in Karoo, dolomite or other sites in which pressure head is above ground surface. The straight-line method proposed by Jacob-Lohman is often adopted for data interpretation. However, the approach may not be able to analyse the test data from flowing artesian holes in TMG. The reason is that the TMG aquifers are often bounded by impermeable faults or folds at local or intermediate scale, which implies that some assumptions of infinite aquifer required for the straight-line method cannot be fulfilled. Boundary conditions based on the Jacob-Lohman method need to be considered during the simulation. In addition, the diagnostic plot analysis method using reciprocal rate derivative is adapted to cross-check the results from the straight-line method. The approach could help identify the flow regimes and discern the boundary conditions, of which results further provide useful information to conceptualize the aquifer and facilitate an appropriate analytical method to evaluate the aquifer properties. Two case studies in TMG were selected to evaluate the hydraulic properties of artesian aquifers using the above methods. The transmissivities of the artesian aquifer in TMG range from 0.6 to 46.7 m2/d based on calculations with recovery test data. Storativities range from 10-4 to 10-3 derived from free-flowing test data analysis. For the aquifer at each specific site, the transmissivity value of the artesian aquifer in Rawsonville is estimated to be 7.5–23 m2/d, with storativity value ranging from 2.0×10-4 to 5.5×10-4. The transmissivity value of the artesian aquifer in Oudtshoorn is approximately 37 m2/d, with S value of 1.16×10-3. The simulation results by straight-line and diagnostic plot analysis methods, not only imply the existence of negative skin zone in the vicinity of the test boreholes, but also highlight the fact that the TMG aquifers are often bounded by impermeable faults or folds at local or intermediate scale. With the storativity values of artesian aquifers derived from data interpretation, total groundwater storage capacity of aquifers at two case studies was calculated. The figures will provide valuable information for decision-makers to plan and develop sustainable groundwater utilization of artesian aquifers in local or intermediate scales. With the hydraulic test device readily available for data collection, more aquifer tests can be carried out in other overflow artesian boreholes in TMG. It becomes feasible to determine the hydraulic properties of artesian aquifers for the entire TMG. Thereof quantification of groundwater resources of artesian aquifers in TMG at a mega-scale becomes achievable. This would also contribute towards global research initiative for quantification of groundwater resources at a mega-scale.
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Wendelborn, Anke. "Zinc and copper behaviour during stormwater aquifer storage and recovery in sandy aquifers". Monash University. Faculty of Engineering. Department of Civil Engineering, Institute for Sustainable Water Resources, 2008. http://arrow.monash.edu.au/hdl/1959.1/68715.

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Abstract (sommario):
In the light of increasing demand and diminishing supplies a sustainable urban water management for Melbourne and other cities will need to include water recycling and reuse of reclaimed water and stormwater. One key issue in stormwater reuse is the need for storage between times of collection until times of demand. Aquifer storage and recovery (ASR) would be a valuable option as it has limited space requirements and restricts loss from evaporation. However, stormwater commonly contains elevated levels of heavy metals, of which Zn and Cu are the most mobile. Stormwater also contains suspended solids, organic carbon, oxygen and nutrients, which influence the behaviour of injected metals and induce geochemical changes in the aquifer. While stormwater ASR has been practiced in limestone aquifers in South Australia, field data for sandy aquifers, which are more prevalent around Melbourne, are very limited. Risk assessment regarding the potential impact of stormwater ASR on the quality of the aquifer and groundwater resources in sandy aquifer is therefore necessary. After a characterisation of stormwater from different Melbourne catchments confirmed comparatively high concentrations of Zn and Cu in stormwater, three siliceous aquifer sediments were used in a series of batch sorption experiments as well as column experiments imitating one ASR cycle to assess the impact of different parameters on Zn and Cu behaviour. The reactive geochemical transport model PHT3D was then modified to simulate experimental results with the outlook that it could be used as a predictive tool for long term evaluation. The study showed that Zn adsorption was limited and desorption of large fractions occurred, indicating that injected amounts of Zn are mobile and would mainly be recovered. In contrast, Cu adsorption was higher and desorption was limited, indicating that injected amounts of Cu would mainly accumulate in the aquifer. The release of metals was triggered by reduction in pH, increase in ionic strength and particle mobilisation. Metal concentrations were also increased after storage phases, while minor sediment constituents, especially organic matter, significantly reduce metal mobility. The different role of dissolved and solid organic carbon is critical in understanding Cu behaviour during stormwater ASR. Pretreatment of stormwater to reduce the injection of colloids, organic carbon and metals are recommended to limit metal accumulation in the subsurface. Monitoring of water quality throughout the ASR cycle would be encouraged to validate the current findings with field data. Special attention should be paid to backflushed water quality to ensure correct disposal.
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Shamsudduha, Mohammad. "Mineralogical and geochemical profiling of arsenic-contaminated alluvial aquifers in the Ganges-Brahmaputra floodplain, Minikganj, Bangladesh". Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/SHAMSUDDUHA_MOHAMMAD_47.pdf.

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Williams, David G. "Whole aquifer system management: the northeast floridan aquifer system under an interstate compact". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/30907.

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Park, Chan-Hee. "Saltwater Intrusion in Coastal Aquifers". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4857.

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Utilizing the analytical solution of the steady state sharp interface saltwater intrusion model in coastal aquifers, a multi-objective optimization formulation of pumping rates and well locations in a coastal aquifer is formulated to solve problems in water management practice. The proposed optimization problem uses progressive genetic algorithm technique and the method developed is applied to the previous work of Cheng et al. [2000]. Through this analysis, several other applications are provided to demonstrate the use of the model in practical applications. This work is the first to optimize pumping rates as well as well locations simultaneously in coastal aquifer management. Known the limitation of the analytical solution, the work is expanded to cover the physics of saltwater intrusion in a more realistic way. This is variable density flow in a variably saturated porous medium. In this method, mixing between two fluids such as saltwater and freshwater can be described and the porous medium is also expanded to cover saturated and unsaturated zones together. One of the objectives is to develop a three dimensional physical model, verify the model, and apply to various applications in coastal aquifers. The developed model, TechFlow, is used to investigate instability issues associated with the numerical solution of the Elder problem in the perspective that includes physical instability issues associated with density differences used in numerical solutions, sensitivity of the solution to idealization irregularity, and the importance of accurate estimation of the velocity field and its association to the grid density levels that is necessary to solve the problem accurately. Saltwater intrusion hydrodynamics in a beach under the influence of tidal effects is also investigated using TechFlow. Based on the results of TechFlow with the use of various boundary conditions for the transport equation, the saltwater intrusion hydrodynamics in a beach under the influence of tidal effects shows unique dynamics. These solutions are primarily affected by density differences, tidal effects on a mild slope, variably saturated porous medium and finite domain solution condition. TechFlow is also used to investigate saltwater upconing beneath pumping wells both two- and three-dimensional applications.
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9

Teo, Hhih-Ting, e h. teo@griffith edu au. "Tidal Dynamics in Coastal Aquifers". Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030729.155028.

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The prediction of coastal groundwater movement is necessary in coastal management. However, the study in this field is still a great challenge due to the involvement of tidal-groundwater interactions and the phenomena of hydrodynamic dispersion between salt-fresh water in the coastal region. To date, numerous theories for groundwater dynamic have been made available in analytical, numerical and also experimental forms. Nevertheless, most of them are based on the zeroth-order shallow flow, i.e. Boussinesq approximation. Two main components for coastal unconfined aquifer have been completed in this Thesis: the vertical beach model and the sloping beach model. Both solutions are solved in closed-form up to higher order with shallow water parameter ([epsilon]) and tidal amplitude parameter ([alpha]). The vertical beach solution contributes to the higher-order tidal fluctuations while the sloping beach model overcomes the shortcomings in the existing solutions. From this study, higher-order components are found to be significant especially for larger value of [alpha] and [epsilon]. Other parameters such as hydraulic conductivity (K) and the thickness of aquifer (D) also affect the water table fluctuations. The new sloping solution demonstrated the significant influence of beach slope ([beta]) on the water table fluctuations. A comprehensive comparison between previous solution and the present sloping solution have been performed mathematically and numerically and the present solution has been demonstrated to provide a better prediction
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10

Halihan, Todd. "Permeability structure in fractured aquifers /". Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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Libri sul tema "Aquifers"

1

Pyne, R. David G. Groundwater recharge and wells: A guide to aquifer storage recovery. Boca Raton: Lewis Publishers, 1995.

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2

Cook, Marlon R. The Eutaw aquifer in Alabama. Tuscaloosa, Ala. (420 Hackberry Lane, Tuscaloosa 35486-9780): Geological Survey of Alabama, Hydrogeology Division, 1993.

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3

Haarhoff, Dorian. Aquifers and dust. Rivonia, Johannesburg: Justified Press, 1994.

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4

Ashworth, John B. Aquifers of Texas. [Austin, Tex.]: Texas Water Development Board, 1995.

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5

Clark, Allan K. Geologic framework of the Edwards aquifer and upper confining unit, and hydrogeologic characteristics of the Edwards aquifer, south-central Uvalde County, Texas. Austin, Tex: U.S. Geological Survey, 1997.

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Johnston, Richard H. Summary of the hydrology of the Floridan aquifer system in Florida and in parts of Georgia, South Carolina, and Alabama. Washington, D.C: U.S. G.P.O., 1988.

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Johnston, Richard H. Summary of the hydrology of the Floridan aquifer system in Florida and in parts of Georgia, South Carolina, and Alabama. Washington, DC: U.S. Dept. of the Interior, 1988.

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Clark, Allan K. Geologic framework of the Edwards aquifer and upper confining unit, and hydrogeologic characteristics of the Edwards aquifer, south-central Uvalde County, Texas. Austin, Tex: U.S. Geological Survey, 1997.

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Clark, Allan K. Geologic framework of the Edwards aquifer and upper confining unit, and hydrogeologic characteristics of the Edwards aquifer, south-central Uvalde County, Texas. Austin, Tex. (8011 Cameron Rd., Austin 78754-3898): U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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Brahana, J. V. Preliminary delineation and description of the regional aquifers of Tennessee--Tertiary aquifer system. Nashville, Tenn: U.S. Dept. of the Interior, Geological Survey, 1986.

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Capitoli di libri sul tema "Aquifers"

1

Kukuric, Neno, Jac van der Gun, Slavek Vasak, Ognjen Bonacci, Irina Polshkova, Ofelia Tujchneider, Marcela Perez et al. "Transboundary Aquifers". In Transboundary Water Resources Management, 87–154. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527636655.ch4.

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Sindalovskiy, Leonid N. "Confined Aquifers". In Aquifer Test Solutions, 3–54. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43409-4_1.

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Sindalovskiy, Leonid N. "Unconfined Aquifers". In Aquifer Test Solutions, 55–69. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43409-4_2.

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Sindalovskiy, Leonid N. "Leaky Aquifers". In Aquifer Test Solutions, 71–114. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43409-4_3.

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Alsharhan, Abdulrahman S., e Zeinelabidin E. Rizk. "Gravel Aquifers". In Water Resources and Integrated Management of the United Arab Emirates, 335–93. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-31684-6_11.

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Alsharhan, Abdulrahman S., e Zeinelabidin E. Rizk. "Limestone Aquifers". In Water Resources and Integrated Management of the United Arab Emirates, 281–309. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-31684-6_9.

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Nimmo, John, David A. Stonestrom e Richard W. Healy. "Aquifers: Recharge". In Fresh Water and Watersheds, 11–15. Second edition. | Boca Raton: CRC Press, [2020] | Revised edition of: Encyclopedia of natural resources. [2014].: CRC Press, 2020. http://dx.doi.org/10.1201/9780429441042-3.

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Price, Michael. "More about aquifers". In Introducing Groundwater, 70–97. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-1811-2_7.

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Sindalovskiy, Leonid N. "Horizontally Heterogeneous Aquifers". In Aquifer Test Solutions, 115–26. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43409-4_4.

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Dhiman, S. C. "Rejuvenation of Aquifers". In Springer Water, 187–204. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2700-1_10.

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Atti di convegni sul tema "Aquifers"

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Ren, Bo, Jerry Jensen, Ian Duncan e Larry Lake. "Buoyant Flow of H2 Versus CO2 in Storage Aquifers". In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210327-ms.

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Abstract Hydrogen will play an important role in the quest to decarbonize the world’s economy by substituting fossil fuels. In addition to the development of hydrogen generation technologies, the energy industry will need to increase hydrogen storage capacity to facilitate the development of a robust hydrogen economy. The required hydrogen storage capacity will be much larger than current hydrogen and natural gas storage capacities. There are a several geological storage options for hydrogen that include depleted hydrocarbon fields and aquifers, where more research is needed until the feasibility to store hydrogen at scale is proven. Here, we investigate the buoyant flow of H2 (as a working gas) versus CO2 (as a cushion gas) separately in a representative storage aquifer. Buoyant flow can affect the maximum storage, capillary trapping, likelihood of leakage, and deliverability of aquifer-stored hydrogen. After building a two-dimensional geological reservoir model initially filled with saline water, we ran numerical simulations to determine how hydrogen placed at the bottom of an aquifer might rise through the water column. The Leverett j-function is used to generate heterogeneous capillary entry pressure fields that correlate with porosity and permeability fields. Hydrogen viscosities were based on the Jossi et al. correlation, and the density was modeled using the Peng-Robinson equation of state. We then simulated several scenarios to assess flow during short- (annually) and long- (several years) term storage. For comparison purposes, we also ran CO2 storage simulations using the same geological model but with CO2-brine-rock properties collected from the literature. For a representative storage aquifer (323 K, 15.7 MPa, and mean permeability of 200 mD), significant fingering occurred as the hydrogen rose through the saline water column. The hydrogen experienced more buoyant flow and created flow paths with increased fingering when compared with CO2. Individual hydrogen fingers are thinner than the CO2 fingers in the simulations and the tip of hydrogen finger fronts propagated upward roughly twice as fast as the CO2 front for a typical set of heterogeneity indicators (Dykstra-Parson’s coefficient Vdp = 0.80, and dimensionless autocorrelation length λdx = 2). The implications of buoyant flow for hydrogen in saline aquifers include an increased threat of leakage, more residual trapping of hydrogen, and, therefore, the need to focus more on the heterogeneity and lateral correlation behavior of the repository. If hydrogen penetrates the caprock of an aquifer, it will leak faster than CO2 and generate more vertical flow pathways. We identify possible depositional environments for clastic aquifers that would offer suitable characteristics for storage.
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Zhang, Zheming, e Ramesh Agarwal. "Numerical Simulation of Geological Carbon Sequestration in Saline Aquifers: Three Case Studies". In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18025.

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Geological carbon sequestration (GCS) is one of the most promising technologies to address the issue of excessive anthropogenic CO2 emissions in the atmosphere due to fossil fuel combustion for electricity generation. For GCS, the saline aquifer geological carbon sequestration is considered very attractive compared to other options because of their huge sequestration capacity in U.S. and other parts of the world. However, in order to fully exploit their potential, the injection strategies need to be investigated that can address the issues of both the CO2 storage efficiency and safety along with their economic feasibility. Numerical simulations can be used to determine these strategies before the deployment of full scale sequestration in saline aquifers. This paper presents the numerical simulations of CO2 sequestration in three large identified saline aquifers (Mt. Simon, Frio, Utsira) where the sequestration is currently underway or has recently been completed (in case of Frio). The numerical simulations are in acceptable agreement with the seismic data available for plume migration. The results of large scale history-matching simulation in Mt. Simon, Frio, and Utsira formations provide important insights in the uncertainties associated with the numerical modeling of saline aquifer GCS.
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Longardner, Robert L., Anthony Visnesky e J. R. Strother. "Increasing the Capacity Factors of Base Load Generating Facilities by Storage of Electrical Energy in Aquifers as Compressed Air". In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-283.

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This paper sets out the advantages of using “off-the-shelf” equipment to produce an effective Compressed Air Energy System (CAES) and to develop the storage parameters of those geological entrapments that can be pressurized with air for the generation of electrical energy on demand. The long lead time and the developmental cost needed to perfect turbo-machinery for aquifer storage has been a deterrant on the utilities in their desire to implement air storage in aquifers. Off-the-shelf hardware and predesigned turbo-machinery specified herein is readily adaptable to aquifer storage parameters and can be manufactured without the expense and uncertainty related to developmental hardware. Hence, normal equipment manufacturer’s assurances and guarantees are available for these applications. When compared to the alternative storage opportunities such as; pumped hydro, battery storage and superconducting magnetic storage, the cost of compressed air storage in aquifers is a fraction of the first cost of these alternatives and as good or better in operating costs.
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Ferreira, J., M. C. Cunha, J. Vieira e J. P. Monteiro. "Optimized exploitation of aquifers: application to the Querença-Silves aquifer system". In WATER RESOURCES MANAGEMENT 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/wrm090011.

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Shariatipour, S. M., G. E. Pickup e E. J. Mackay. "The Impact of Aquifer/Caprock Morphology on CO2 Storage in Saline Aquifers". In 3rd EAGE International Conference on Fault and Top Seals. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20143049.

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Fomin, Sergei, Vladimir Chugunov e Toshiyuki Hashida. "Application of Fractional Derivatives for Simulating Diffusion Into Porous Matrix in Mathematical Modeling of the Contaminant Transport in a Confined Fractured Porous Aquifer". In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16138.

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Solute transport in the fractured porous confined aquifer is modeled by the advection-dispersion equation with fractional time derivative of order γ, which may vary from 0 to 1. Accounting for diffusion in the surrounding rock mass leads to the introduction of an additional fractional time derivative of order 1/2 in the equation for solute transport. The closed-form solutions for concentrations in the aquifer and surrounding rocks are obtained for the arbitrary time-dependent source of contamination located in the inlet of the aquifer. Based on these solutions, different regimes of contamination of the aquifers with different physical properties are modeled and analyzed.
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Zhang, Haiyang, Mohammed Al Kobaisi, Yihuai Zhang e Muhammad Arif. "Effect of Variable Brine Salinities on CO2 Trapping: Implications for CO2 Storage in Saline Acquires". In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212695-ms.

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Abstract Injecting CO2 into the saline aquifer is considered to be an effective strategy to mitigate CO2 emissions. Saline aquifers are known to have a wide range of salinities and several evidences showed that different brine salinities give rise to different CO2-brine-rock wetting behaviors as well as different CO2 solubility potential. This will ultimately influence the CO2 plume migration behavior and the overall performance of a CO2 sequestration project. However, associated field-scale CO2 capacity predictions in different saline aquifers received little attention. This study conducts field-scale numerical simulations to analyze the effect of aquifer salinity on the CO2 storage potential. Different CO2-brine flow behaviors undervariablebrine salinities were considered. The results showed that an increase in the plume migration distance was observed in a higher salinity aquifer.While an increase in the brine salinity would result in an increase in residual trapping but a decreased solubility trapping capacities.Also, higher salinity formation observed more mobile CO2 and thus exhibit a worse sealing efficiency. We point out that residual trapping capacity evaluation should consider both residual CO2 saturation and the CO2 occupied volume, which both are strong functions of brine salinity.
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Barlow, Paul M., e Allen F. Moench. "WTAQ -- A Computer Program for Aquifer-Test Analysis of Confined and Unconfined Aquifers". In Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40517(2000)366.

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Van De Velden, Mark Willem Jan, Vinod Kumar Wali, Said Houqani e Moataz Riyami. "Expandable Sleeve Isolate Shallow Aquifers". In SPE Middle East Oil and Gas Show and Conference. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/120684-ms.

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Sherif, Mohsen, e Ampar Shetty. "Freshwater Storage in Brackish Aquifers". In World Environmental and Water Resources Congress 2013. Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784412947.043.

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Rapporti di organizzazioni sul tema "Aquifers"

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Slattery, S. R., P. J. Barnett, A. J. M. Pugin, D. R. Sharpe, D. Goodyear, R E Gerber, S. Holysh e S. Davies. Tunnel-channel complexes in the Zephyr area, Ontario: potential high-yield aquifers. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331410.

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In south-central Ontario, tunnel channels are primary targets for groundwater exploration due to their potential to contain confined, water-bearing, coarse-grained sediment fills. Despite extensive hydrogeologic and geologic exploration within these features, a comprehensive depositional model that illustrates the spatial distribution of coarse- and fine- grained sediment in tunnel-channel complexes is absent. Work in the Zephr area, north of ORM, presents new subsurface data to improve understanding of this geologic setting and to add to geologic models of these channel systems. Findings result from combined geology, sedimentology, geophysics (seismic profiling) and sediment drilling (mud rotary and continuous core) to better our understanding the shallow channel setting north of ORM, including: 1) spatial distribution of coarse- and fine-grained sediments in tunnel-channels; 2) the architecture of tunnel-channel sequences in confluence zones. Preferred aquifer targets aquifer units in the Zephyr area are identified in areas of channel confluence and channel bends. Channel aquifers are confined by 3.9 to 28.5 m thick deposits of rhythmically bedded silt and clay.
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TROJER, Mathias, e Stephan MATTHAI. CO2 migration in saline aquifers. Cogeo@oeaw-giscience, settembre 2011. http://dx.doi.org/10.5242/iamg.2011.0102.

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Halliwell, D. R., S. Vanderburgh, B. D. Ricketts e L. E. Jackson. Unconfined aquifers, Fraser River Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/184136.

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Carter, T. R., C. E. Logan, J K Clark, H. A. J. Russell, E. H. Priebe e S. Sun. A three-dimensional bedrock hydrostratigraphic model of southern Ontario. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331098.

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A hydrostratigraphic framework has been developed for southern Ontario consisting of 15 hydrostratigraphic units and 3 regional hydrochemical regimes. Using this framework, the 54 layer 3-D lithostratigraphic model has been converted into a 15 layer 3-D hydrostratigraphic model. Layers are expressed as either aquifer or aquitard based principally on hydrogeologic characteristics, in particular the permeability and the occurrence/absence of groundwater when intersected by a water well or petroleum well. Hydrostratigraphic aquifer units are sub-divided into up to three distinct hydrochemical regimes: brines (deep), brackish-saline sulphur water (intermediate), and fresh (shallow). The hydrostratigraphic unit assignment provides a standard nomenclature and definition for regional flow modelling of potable water and deeper fluids. Included in the model are: 1) 3-D hydrostratigraphic units, 2) 3-D hydrochemical fluid zones within aquifers, 3) 3-D representations of oil and natural gas reservoirs which form an integral part of the intermediate to deep groundwater regimes, 4) 3-D fluid level surfaces for deep Cambrian brines, for brines and fresh to sulphurous groundwater in the Guelph Aquifer, and the fresh to sulphurous groundwater of the Bass Islands Aquifer and Lucas-Dundee Aquifer, 5) inferred shallow karst, 6) base of fresh water, 7) Lockport Group TDS, and 8) the 3-D lithostratigraphy. The 3-D hydrostratigraphic model is derived from the lithostratigraphic layers of the published 3-D geological model. It is constructed using Leapfrog Works at 400 m grid scale and is distributed in a proprietary format with free viewer software as well as industry standard formats.
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Jensen, E. J. An evaluation of aquifer intercommunication between the unconfined and Rattlesnake Ridge aquifers on the Hanford Site. Office of Scientific and Technical Information (OSTI), ottobre 1987. http://dx.doi.org/10.2172/5892330.

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Petrik, W. A. Aquifers and hydrology at Anchor Point, Alaska. Alaska Division of Geological & Geophysical Surveys, 1993. http://dx.doi.org/10.14509/1609.

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Munter, J. A., e R. D. Allely. Water-supply aquifers at Eagle River, Alaska. Alaska Division of Geological & Geophysical Surveys, 1993. http://dx.doi.org/10.14509/2289.

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Fliermans, C. B., J. House e M. M. Franck. Microbial Physiology of Subsurface Aquifers at SRS. Office of Scientific and Technical Information (OSTI), settembre 1995. http://dx.doi.org/10.2172/201540.

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Woodbury, A., Y. Jiang e S. Painter. Bayesian and maximum entropy inversion of highly heterogeneous aquifers. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/299514.

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Garcia, Julio Enrique. Fluid Dynamics of Carbon Dioxide Disposal into Saline Aquifers. Office of Scientific and Technical Information (OSTI), gennaio 2003. http://dx.doi.org/10.2172/821335.

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