scholarly journals Combined method of 3H/3He apparent age and on-site helium analysis to identify groundwater flow processes and transport of perchloroethylene (PCE) in an urban area

2021 ◽  
Vol 238 ◽  
pp. 103773
Author(s):  
Christian Moeck ◽  
Andrea L. Popp ◽  
Matthias S. Brennwald ◽  
Rolf Kipfer ◽  
Mario Schirmer
Keyword(s):  
Groundwater Flow ◽  
Urban Area ◽  
Combined Method ◽  
Flow Processes ◽  
Apparent Age

Isotope-based investigation on the groundwater flow and recharge mechanism in a hard-rock aquifer system: the case of Ranchi urban area, India

2013 ◽  
Vol 21 (5) ◽  
pp. 1101-1115 ◽  
Author(s):  
Dipankar Saha ◽  
S. N. Dwivedi ◽  
Goutam Kr Roy ◽  
D. V. Reddy
Keyword(s):  
Groundwater Flow ◽  
Urban Area ◽  
Hard Rock ◽  
Aquifer System ◽  
Hard Rock Aquifer

Ground-based thermal imaging of groundwater flow processes at the seepage face

2009 ◽  
Vol 36 (14) ◽  
Author(s):  
Richard S. Deitchman ◽  
Steven P. Loheide
Keyword(s):  
Groundwater Flow ◽  
Thermal Imaging ◽  
Flow Processes ◽  
Seepage Face

scholarly journals Groundwater Flow Processes and Human Impact along the Arid US-Mexican Border, Evidenced by Environmental Tracers: The Case of Tecate, Baja California

2018 ◽  
Vol 15 (5) ◽  
pp. 887 ◽  
Author(s):  
Jürgen Mahlknecht ◽  
Luis Daessle ◽  
Maria Esteller ◽  
Juan Torres-Martinez ◽  
Abrahan Mora
Keyword(s):  
Groundwater Flow ◽  
Human Impact ◽  
Baja California ◽  
Environmental Tracers ◽  
Flow Processes

scholarly journals Groundwater flow processes and mixing in active volcanic systems: the case of Guadalajara (Mexico)

2015 ◽  
Vol 12 (2) ◽  
pp. 1599-1631
Author(s):  
A. Hernández-Antonio ◽  
J. Mahlknecht ◽  
C. Tamez-Meléndez ◽  
J. Ramos-Leal ◽  
A. Ramírez-Orozco ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Agricultural Practices ◽  
Principal Component ◽  
Distribution Patterns ◽  
Groundwater Chemistry ◽  
Polluted Water ◽  
Regional Flow ◽  
Flow Processes ◽  
Production Wells ◽  
Hydrothermal Water

Abstract. Groundwater chemistry and isotopic data from 40 production wells in the Atemajac and Toluquilla Valleys, located in and around the Guadalajara metropolitan area, were determined to develop a conceptual model of groundwater flow processes and mixing. Multivariate analysis including cluster analysis and principal component analysis were used to elucidate distribution patterns of constituents and factors controlling groundwater chemistry. Based on this analysis, groundwater was classified into four groups: cold groundwater, hydrothermal water, polluted groundwater and mixed groundwater. Cold groundwater is characterized by low temperature, salinity, and Cl and Na concentrations and is predominantly of Na-HCO3 type. It originates as recharge at Primavera caldera and is found predominantly in wells in the upper Atemajac Valley. Hydrothermal water is characterized by high salinity, temperature, Cl, Na, HCO3, and the presence of minor elements such as Li, Mn and F. It is a mixed HCO3 type found in wells from Toluquilla Valley and represents regional flow circulation through basaltic and andesitic rocks. Polluted groundwater is characterized by elevated nitrate and sulfate concentrations and is usually derived from urban water cycling and subordinately from agricultural practices. Mixed groundwaters between cold and hydrothermal components are predominantly found in the lower Atemajac Valley. Tritium method elucidated that practically all of the sampled groundwater contains at least a small fraction of modern water. The multivariate mixing model M3 indicates that the proportion of hydrothermal fluids in sampled well water is between 13 (local groundwater) and 87% (hydrothermal water), and the proportion of polluted water in wells ranges from 0 to 63%. This study may help local water authorities to identify and quantify groundwater contamination and act accordingly.

Modeling of groundwater flow velocity and aquifer recharge in a Cenozoic multi-aquifer system – a case study from Eastern Brandenburg (Germany)

2020 ◽  
Author(s):  
Silvio Janetz ◽  
Christoph Jahnke ◽  
Frank Wendland ◽  
Hans-Jürgen Voigt
Keyword(s):  
Groundwater Flow ◽  
Groundwater Resources ◽  
Turnover Time ◽  
Aquifer Recharge ◽  
Deep Groundwater ◽  
Near Surface ◽  
Aquifer System ◽  
Deep Aquifers ◽  
Regional Flow ◽  
Flow Processes

<p>In recent years, deep aquifers (> 50 m below ground level) have become increasingly interesting for the supply of drinking and irrigation water or geothermal use. Understanding the regional flow processes between near-surface and deep aquifer systems is an important criterion for the sustainable management of deep groundwater resources. However, hydrogeological conditions, regional flow rates and aquifer recharge in deep aquifers are largely unknown in many cases. The aims of the present study are therefore to determine (i) groundwater flow velocities in a Cenozoic multi-aquifer system, and (ii) proportion of aquifer recharge into the individual Cenozoic aquifers and timescales to completely replace water in the Cenozoic aquifers (turnover time).  </p><p>The numerical study was carried out in three adjacent groundwater catchment areas in the region of Eastern Brandenburg. In a first step, a hydrogeological 3D model of the entire Cenozoic aquifer system (85 km × 73 km and down to a depth of 0.5 km) was developed, which comprises up to 12 unconsolidated sandy aquifers and 10 confining units (glacial tills, silts and clays). In a second step, a steady-state flow modelling was performed including calibration using natural hydraulic head data from both regional main and deep aquifers.</p><p>The modeling results show that the average groundwater flow velocities decrease from 20-50 m/a in the near-surface Pleistocene main aquifers to 1-2 m/a in the deep Oligocene aquifers. At the same time, the aquifer recharge in the aquifer system decreases substantially with increasing depth. Depending on the catchment geology, the Pleistocene main aquifers are recharged by 65-70 % of infiltration water, while the aquifer recharge of the deep Oligocene aquifers is only 4.5-9.5 %. The calculations of turnover time indicate that the time periods to completely flush the deep aquifers are very long (approx. between 90 and 4600 years). The results thus allow a first quantification of the flow processes between near-surface and deep aquifers as well as the identification of flow paths to develop a utilization concept for deep groundwater resources in the region of Eastern Brandenburg.</p>

scholarly journals Groundwater flow processes and mixing in active volcanic systems: the case of Guadalajara (Mexico)

2015 ◽  
Vol 19 (9) ◽  
pp. 3937-3950 ◽  
Author(s):  
A. Hernández-Antonio ◽  
J. Mahlknecht ◽  
C. Tamez-Meléndez ◽  
J. Ramos-Leal ◽  
A. Ramírez-Orozco ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Principal Component ◽  
Distribution Patterns ◽  
Groundwater Chemistry ◽  
Return Flow ◽  
Stable Water Isotopes ◽  
Relative Contribution ◽  
Regional Flow ◽  
Flow Processes ◽  
Production Wells

Abstract. Groundwater chemistry and isotopic data from 40 production wells in the Atemajac and Toluquilla valleys, located in and around the Guadalajara metropolitan area, were determined to develop a conceptual model of groundwater flow processes and mixing. Stable water isotopes (δ2H, δ18O) were used to trace hydrological processes and tritium (3H) to evaluate the relative contribution of modern water in samples. Multivariate analysis including cluster analysis and principal component analysis were used to elucidate distribution patterns of constituents and factors controlling groundwater chemistry. Based on this analysis, groundwater was classified into four groups: cold groundwater, hydrothermal groundwater, polluted groundwater and mixed groundwater. Cold groundwater is characterized by low temperature, salinity, and Cl and Na concentrations and is predominantly of Na-HCO3-type. It originates as recharge at "La Primavera" caldera and is found predominantly in wells in the upper Atemajac Valley. Hydrothermal groundwater is characterized by high salinity, temperature, Cl, Na and HCO3, and the presence of minor elements such as Li, Mn and F. It is a mixed-HCO3 type found in wells from Toluquilla Valley and represents regional flow circulation through basaltic and andesitic rocks. Polluted groundwater is characterized by elevated nitrate and sulfate concentrations and is usually derived from urban water cycling and subordinately from agricultural return flow. Mixed groundwaters between cold and hydrothermal components are predominantly found in the lower Atemajac Valley. Twenty-seven groundwater samples contain at least a small fraction of modern water. The application of a multivariate mixing model allowed the mixing proportions of hydrothermal fluids, polluted waters and cold groundwater in sampled water to be evaluated. This study will help local water authorities to identify and dimension groundwater contamination, and act accordingly. It may be broadly applicable to other active volcanic systems on Earth.

Groundwater flow and contaminant transport modeling applications in urban area: scopes and limitations

2012 ◽  
Vol 19 (6) ◽  
pp. 1981-1993 ◽  
Author(s):  
Alfa-Sika Mande Seyf-Laye ◽  
Liu Mingzhu ◽  
Gbandi Djanéyé-Bouindjou ◽  
Liu Fei ◽  
Kamaletdinova Lyutsiya ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Urban Area ◽  
Contaminant Transport ◽  
Transport Modeling ◽  
Contaminant Transport Modeling
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