Temat: groundwater modeling

Skocz do pozycji: 1.

Tytuł:: Establishing a Groundwater Quality and Quantity Monitoring System as a Prerequisite for the Determination of Protection Zones in Lipjan, Kosovo
Autorzy:: Osmanaj, Lavdim
Krasniqi, Vlerë
Kusari, Laura
Hajdari, Venera
Tematy:: groundwater monitoring
water quality assessment
real-time data
protection zones
groundwater modeling; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59114500.pdf Link otwiera się w nowym oknie
Opis:: The scarcity of groundwater monitoring in Kosovo, particularly in Lipjan, underscores the urgency to assess and safeguard this vital resource amidst escalating water demands and mounting pollution. This study addresses the critical gap in groundwater data by proposing the establishment of a comprehensive monitoring system. The primary goal was to develop a system capable of providing real-time data on groundwater quality and quantity within the capture area. Specific research objectives include the daily real-time monitoring of groundwater quality, identif ication, and quantification of contaminants in the aquifer, as a basis for further work on delineation of contaminant sources impacting the capture area, and monitoring and quantifying water extraction rates from individual wells, therefore establishing the necessary protection zones. Seven divers have been installed in 7 monitoring wells in Lipjan to measure the water level and pressure, as well as a multiparameter sensor for water quality monitoring for pH, temperature, specific conductivity, total dissolved solids, and dissolved oxygen. The digital monitoring system has been set up to input and log the incoming data. The aim was to gather this data, analyze it and use it to create a model and calibrate it to match the observed data. Concurrently, a sensitivity analysis was performed to prioritize data collection and establish which parameters have the most significant impact on the model outcomes. This ensures the establishment of a model which will, in the future, be used to predict and forecast groundwater levels and quality and determine protection zones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Assessment of the Groundwater in Erbil Basin with Support of Visual MODFLOW
Autorzy:: Mustafa, Jwan Sabah
Mawlood, Dana Khider
Tematy:: analyzing the groundwater
Erbil Basin
groundwater flow modeling
visual MODFLOW; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59114462.pdf Link otwiera się w nowym oknie
Opis:: Groundwater stands as a crucial lifeline in numerous regions across the globe, a significance magnified in water-scarce locales like the Middle East. With depleting water resources exacerbated by global climate change, the imperative for sustainable groundwater management becomes increasingly urgent. This research employs a groundwater flow modeling approach, utilizing Visual MODFLOW (version 4.6.0.166), to scrutinize the present state and future security risks of groundwater resources in the Erbil basin. A distinct aspect of this study involves investigating the interaction between the groundwater aquifers of Greater Zab and Lesser Zab Rivers, along with an exploration of the Erbil aquifers, rivers interaction and recharge zones as a second novelty in this research. The model, calibrated for heterogenous anisotropic unconfined aquifer transient conditions, exhibits a high correlation coefficient (CC) of 0.997 during calibration and 0.985 in the validation process respectively. Findings indicate a general groundwater flow direction from northeast to southwest in the Erbil basin, aligning with surface observations. Despite groundwater aquifers supplying only 55% of the current water demand from the existing wells, the computed balance reveals river leakages of 33,432 m3/day into the aquifers. The study forecasts a substantial increase in the dry area of the groundwater aquifer under climate change scenarios, especially when recharge rates diminish. To mitigate these impacts, the study recommends preventing illegal well drilling and implementing continuous monitoring using distributed sensors. The insights gleaned from this research are anticipated to furnish essential information for sustainable planning and effective management of groundwater resources in the Erbil basin and its environs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam)
Autorzy:: Nguyen, Thao Bach
Duc, Nhan Dang
Dao, Bang Duc
Tematy:: saltwater intrusion
groundwater modeling
sustainable groundwater development
coastal aquifers
surface water interaction,
water resource management
wody podziemne
zarządzanie
Wietnam; Pokaż więcej
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Powiązania:: https://bibliotekanauki.pl/articles/27323254.pdf Link otwiera się w nowym oknie
Opis:: Saltwater intrusion in the rapidly developing city of Da Nang in central Vietnam is currently causing various water-related challenges, including inadequate water supply and water pollution. An integrated SWAT-MODFLOW numerical model was used to investigate the origin and mechanism of saltwater in Holocene and Pleistocene aquifers. Geophysical and isotopic approaches were used to validate the SEAWAT model applied for simulating saltwater intrusion. The results suggest that the ebb and flow of tides, as well as water levels in rivers primarily impact coastal aquifers. However, effective water resource planning and management, along with maintaining the natural recharge of fresh water from local rain during the rainy season, could enable the rational and efficient utilization of groundwater, reducing saltwater intrusion in many areas. During the dry season, groundwater is recharged from higher altitude areas. The current saltwater intrusion mainly occurs along the rivers up to the hydraulic dam. Simulated models, using scenarios of stop abstracting groundwater, but changing to the use of surface water for drinking water, show that the area of saline water shrinks quickly after 30 years, reducing from 59.6 km2 to 39.5 km2 and from 40.2 km2 to 28.6 km2 in the Holocene and Pleistocene, respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A groundwater flow model for the Wolin Island area, including glaciotectonic deformation
Autorzy:: Hoc, R.
Sadurski, A.
Wiśniowski, Z.
Tematy:: GIS
groundwater modeling
groundwater exploitation
coastal hydrogeology
southern Baltic Sea coast
modelowanie wód gruntowych
eksploatacja wód podziemnych
hydrogeologia
Morze Bałtyckie; Pokaż więcej
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Powiązania:: https://bibliotekanauki.pl/articles/94492.pdf Link otwiera się w nowym oknie
Opis:: During the construction of mathematical models for mapping hydrogeological conditions it is necessary to apply simplifications, both in the geological structure and in hydrogeological parameters used. The present note discusses problems surrounding the mapping of glaciotectonic disturbances that occur in the northern part of Wolin Island (northwest Poland). For this part of the island, a direct outflow of groundwater towards the Baltic Sea basin has been determined on the basis of geophysical survey results. An important feature in the hydrogeological conditions here is the isolation of groundwater from both the Baltic Sea and Szczecin Lagoon by clay with a Cretaceous xenolith. Such a geological structure explains the presence of perched water at considerable heights in zones close to the cliffs, without any significant hydraulic connection with surrounding reservoirs. Hydrogeological conditions of Wolin Island have been modelled using the Visual MODFLOW package v.4.2. In the vertical section, these conditions can be simplified to one aquifer (Pleistocene-Holocene), in which two aquifers can be distinguished. In a large part of the island, these remain in mutual hydraulic contact: layer I – upper, with an unconfined aquifer, and layer II – lower, with a confined aquifer, locally an unconfined one. The schematisation of hydrogeological conditions adopted here has allowed to reproduce present groundwater dynamics in the study area.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The velocity oriented approach revisited
Autorzy:: Nawalany, M.
Zijl, W.
Tematy:: velocity oriented approach
continuity of water flux
groundwater flow modeling; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2063027.pdf Link otwiera się w nowym oknie
Opis:: A great deal of hydrogeological situations requires an extremely accurate calculation of the 3-dimensional groundwater discharge rates in the subsoil. Examples are: hydrology of wetlands, water balances of aquatic ecosystems depending on groundwater recharge, river-groundwater interaction, advective transport of pollution underneath waste disposal sites, particle trajectories in aquifer-aquitard systems with contrasting heterogeneities and many others. Numerical determination of the vertical groundwater velocity is a notoriously difficult problem. In nature this component may be two or three orders of magnitude smaller than the horizontal velocity components. In such cases application of Darcy’s law to the numerically calculated hydraulic heads obtained from a finite difference or finite element model may lead to relatively inaccurate vertical velocities. More specifically, when estimating vertical velocity components in cases where the Dupuit approximation – negligible vertical head gradient – holds, numerical differentiation of hydraulic heads yields zero vertical velocity. In the 1980s of the last century Zijl and Nawalany proposed to invert the order of calculating the velocity field by eliminating the head from Darcy’s law and to consider the Darcy velocity as the primary variable. For 2-dimensional flow this was already common practice and the challenge was a 3-dimensional extension, which was called the Velocity Oriented Approach (VOA). In two dimensions such methods were conventionally based on a stream function as primary variable. However, at that time application of a 3D stream function was not feasible and, therefore, the Darcy velocity itself was considered as the primary variable. This approach has been proven to yield a high accuracy for all three components of the specific discharge, including the relatively small vertical component, especially in cases where the subsoil is smoothly heterogeneous in the horizontal directions. In the 1990s the mixed-hybrid finite element method was developed. The physical interpretation of this method shows the way how to liberate the VOA from its smoothness requirement by introduction of a practical applicable 3D stream function. In conclusion, the velocity oriented approach indicates a change in paradigm regarding the accurate calculation of specific discharge in groundwater flow.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Ocena zmian warunków hydrogeologicznych podziemnych zakładów górniczych w GZW za pomocą modeli numerycznych
Evaluation of changes of the hydrogeological conditions of underground mines located in USCB with using numerical models
Autorzy:: Niedbalska, K.
Tematy:: hydrogeologia
modelowanie procesów filtracji
górnictwo
odwadnianie kopalń
zagrożenia wodne
hydrogeology
groundwater modeling
mining
mine drainage
water hazards; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2062300.pdf Link otwiera się w nowym oknie
Opis:: W artykule podjęto próbę scharakteryzowania możliwości zastosowania modeli numerycznych w aspekcie ich wykorzystania dla prognozowania warunków hydrogeologicznych, zagrożenia wodnego, przebiegu likwidacji kopalń i zatapiania wyrobisk na potrzeby i w warunkach górnictwa węgla kamiennego w GZW. Przeanalizowano zarówno wyniki doświadczeń GIG, jak i informacje dostępne w zebranej literaturze. Ocenę przeprowadzono pod kątem możliwości wykorzystania modeli hydrodynamicznych jako podstawy do kreowania różnych rozwiązań problemów hydrogeologicznych i prognoz opartych na bieżąco uzupełnianych danych.
In this article author attempted to characterize the applicability of numerical models in the context of their use for prediction of the hydrogeological conditions, water hazards, processes of mines closure and mine workings flooding up for purposes of coal mining in Upper Silesian Coal Basin. Results of the GIG experience and information from the subject literature were analyzed. The evaluation was carried out for the possibility of using hydrodynamic models as a basis for creating a various solutions of hydrogeological problems and predictions based on data systematically collected and applied to the model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Zastosowanie numerycznego modelu filtracji w ocenie wpływu robót inżynierskich na wody podziemne na przykładzie planowanego tunelu między wyspami Wolin i Uznam
Design of numerical flow model for evaluation of geoengineering investments impact on groundwater on the example of tunnel between Wolin and Uznam islands
Autorzy:: Gurwin, J.
Ruszkiewicz, P.
Tematy:: budowa tunelu
numeryczny model filtracji
MODFLOW/MODPATH
wyspy Uznam i Wolin
tunnel construction
numerical groundwater modeling
Uznam and Wolin islands; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2063108.pdf Link otwiera się w nowym oknie
Opis:: Badania modelowe przeprowadzono w celu określenia lokalnego systemu krążenia wód podziemnych, składników bilansu wodnego oraz oddziaływania na wody podziemne inwestycji polegającej na budowie tunelu pod rzeką Świną. Inwestycja ma za zadanie połączenie wysp Uznam i Wolin. Wykorzystano program MODFLOW w konfiguracji Groundwater Vistas 5.0. Po przeprowadzeniu kalibracji modelu dla warunków naturalnych według stanu z 2008 r. wykonano symulacje prognostyczne dla 3 wariantów lokalizacji inwestycji. Najbardziej prawdopodobna opcja K3 W 1, wysunięta najbardziej na południe, została przeanalizowana bardziej szczegółowo ze względu na możliwość oddziaływania na pobliskie ujęcie wód podziemnych Wydrzany dla Świnoujścia. Po wykonaniu obliczeń wykazano, że budowa ramp zjazdowych i związane z tym prace odwodnieniowe nie spowodują negatywnych skutków w funkcjonowaniu ujęcia.
The investigations were conducted to establish a flow system, groundwater balance within the area surrounding the tunnel between Uznam and Wolin islands using MODFLOW package in configuration of the GROUNDWATER VISTAS 5.0 environment. After model calibration for natural conditions the simulations were done for the three projected options of tunnel location. The most probable variant called K3 W 1 was analyzed more detailed showing that such a concept could generate some influence on the Wydrzany water intake. But after simulation in pumping conditions on the average level for the last years it is evidenced that groundwater surface decrease due to the ramp construction doesn't disrupt normal exploitation of the intake.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Problem zasobów wód podziemnych
A problem of groundwater resources
Autorzy:: Sadurski, A.
Śmietański, L.
Tematy:: zasoby wód podziemnych
szacowanie zasobów wodnych
modelowanie przepływu wód podziemnych
groundwater resources
water resources estimation
groundwater flow modeling; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2075433.pdf Link otwiera się w nowym oknie
Opis:: The term of groundwater resources was introduced to hydrogeology from economic geology similarly to the resources of ore bodies almost hundred years ago. It results years ago from the needs of physical planning, investment in new water intakes and water management. Discussion on the groundwater resources was started in the past after new method of their evaluation, e.g. analytical approaches, physical and then numerical modeling techniques implementation. The ecological aspects of water demands obliges to introduce new idea of quantities of groundwater resources estimation. This idea is also presented in the Water Framework Directive and in the water management planes in the water catchment areas.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Groundwater well fields in ice-margin valley aquifers – is it easy to protect them, or not? An overview of hydrogeological and legal aspects of determining wellhead protection zones
Autorzy:: Matusiak, Magdalena
Górski, Józef
Dragon, Krzysztof
Kruć-Fijałkowska, Roksana
Tematy:: quantitative protection of groundwater
overexploitation
sustainable groundwater management
groundwater flow modeling
ochrona wód podziemnych
nadmierna eksploatacja
zrównoważone zarządzanie wodami podziemnymi
modelowanie przepływu wód podziemnych; Pokaż więcej
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Powiązania:: https://bibliotekanauki.pl/articles/59123086.pdf Link otwiera się w nowym oknie
Opis:: This paper discusses principles for delineating wellhead protection zones (WHPZ) of groundwater well fields in ice-margin valleys. A distinctive feature of such well fields is that, apart from the often geogenically contaminated water of ice-margin valleys, they are largely supplied with high-quality water from intertill aquifers of neighbouring uplands. However, much of this inflow can be intercepted by wells for agriculture that are increasingly being constructed in the capture zones of existing municipal well fields, thus posing a threat to the quality of water for the public. This problem has been investigated using the example of a municipal well in Wroniawy (Poland) by analysing changes in the recharge components of this well field with a groundwater flow model. The results indicate that the commissioning of agricultural abstractions in the capture zone of this well field reduces inflow from intertill aquifers (8.5 per cent) and precipitation recharge (3.3 per cent), following a change in the extent of the capture zone. The loss of these qualitative recharge components is substituted by an increase in poor-quality water, i.e., surface water (7.3 per cent) and geogenically contaminated water from the ice-margin valley centre (3.8 per cent). Protecting well fields in such locations from adverse water quality changes requires the implementation of quantitative shielding of best-quality water, calling for WHPZ to cover the entire capture zone regardless of water flow timing, which is not provided for in Polish legislation. Costs and constraints of implementing such a WHPZ can be reduced by dividing it into sectors that differ in the scope of limitations, with the only quantitative protection applied to the outermost, medium- and low-vulnerable parts of the capture zone.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Spatiotemporal Assessment of Groundwater Quality in the Oum Rbia Watershed Using GIS-Pro and Water Quality Indices
Autorzy:: Ouhakki, Hicham
Taouil, Hamid
El Fallah, Kamal
Zerraf, Soufiane
El Mejdoub, Nouredine
Tematy:: water quality modeling
ArcGIS-Pro
interpolation
MQI- modeling
Oum Er-Rabia
groundwater; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59114199.pdf Link otwiera się w nowym oknie
Opis:: Groundwater analysis across the Oum Rbia watershed is currently hampered by technical constraints and high costs. This research aimed to produce comprehensive groundwater quality maps throughout the basin aquifers by integrating the water quality index (WQI) and microbiological quality index (MQI) with GIS-Pro for a spatiotem poral assessment of water quality. Twenty physicochemical parameters, including pH, temperature, conductivity, total dissolved solids, permanganate index, ammonium (NH₄⁺), major cations (Na⁺, K⁺, Ca2⁺, Mg2⁺, Mn2⁺), major anions (Cl-, HCO3-, NO2-, NO2-, CO3-2, SO₄2-), total hardness (TH), total alkalinity (TAC), and total iron (FeT) concentration were analyzed. Additionally, the microbiological parameters, such as the fecal streptococci, fecal coliforms, and total coliforms were investigated. Fieldwork conducted over twelve campaigns during the 2021 and 2022 seasons involved sample collection from fifty-four locations across the six aquifers of the watershed. The comprehensive database facilitated the calculation of both MQI and WQI. Kriging interpolation was utilized to create spatial estimates of these indices beyond the sampling points, enabling the generation of maps that visualize water quality across the study area. WQI indicated that groundwater in most of the studied basin is of excellent quality, though water quality deteriorates in the areas receiving wastewater discharge from urban, industrial, and agricultural activities. The MQI results revealed significant pathogenic germ contamination across a substantial portion of the watershed, intensifying during the summer due to such factors as temperature, river flow, human activities, and seasonal pollution sources. These maps enhance the understanding of water table information for non-experts as well as aid decision-makers in identifying critical areas and developing effective management strategies. However, complexities in water quality and training data influence the accuracy of ArcGIS-Pro predictions, potentially overlooking key factors if the data is insufficient.
Dostawca treści:: Biblioteka Nauki

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