<i>Investigating Groundwater Flow and Aquifer Recharge in a Karstic Aquifer Considering the Potentiometric Surface-A Research Prospectus</i>

2018 ◽  
Author(s):  
C. J. Barrie ◽  
Ernest W. Tollner
Keyword(s):  
Groundwater Flow ◽  
Karstic Aquifer ◽  
Aquifer Recharge ◽  
Potentiometric Surface

Groundwater-flow modeling in the Yucatan karstic aquifer, Mexico

2002 ◽  
Vol 10 (5) ◽  
pp. 539-552 ◽  
Author(s):  
Roger González-Herrera ◽  
Ismael Sánchez-y-Pinto ◽  
José Gamboa-Vargas
Keyword(s):  
Groundwater Flow ◽  
Flow Modeling ◽  
Karstic Aquifer ◽  
Groundwater Flow Modeling

scholarly journals APPLICATION OF THE MATHEMATICAL MODEL MODFLOW ON A KARSTIC AQUIFER: THE CASE OF VIOTIKOS KIFISOS BASIN

2004 ◽  
Vol 36 (4) ◽  
pp. 2021
Author(s):  
A. Παναγόπουλος ◽  
E. Δρακοπούλου ◽  
V. Περλέρος
Keyword(s):  
Mathematical Model ◽  
Groundwater Flow ◽  
Flow Simulation ◽  
Karstic Aquifer ◽  
Conventional Model ◽  
Groundwater Evolution ◽  
Restricted Volume ◽  
Primary Porosity ◽  
The Mathematical Model ◽  
Regional Groundwater

MODFLOW is a very well verified code of mathematical modeling for simulation of saturated groundwater flow in porous medium. Groundwater flow simulation in discontinuity media (i.e. media characterized by dominance of secondary and tertiary porosity as opposed to primary porosity), such as karstic aquifers, utilizing specialized models is problematic. Due to existing impedes the use of the conventional model MODFLOW was attempted for the simulation of the karstic system of the Viotikos Kifisos river aiming predominantly at assessing the potential, restrictions, particularities and conditions under which such a modelling code could be implemented, especially when relatively restricted volume of raw data is available. Compilation and calibration of the model suggest that MODFLOW may in general be implemented and can provide useful results. As in every mathematical model, knowledge of the assumptions made and the intrinsic restrictions involved is required, along with in-depth evaluation of its capabilities. The mathematical model of Viotikos Kifisos basin forms a valuable tool for management of its water resources and study of regional groundwater evolution.

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

&lt;p&gt;In recent years, deep aquifers (&gt; 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). &amp;#160;&lt;/p&gt;&lt;p&gt;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 &amp;#215; 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.&lt;/p&gt;&lt;p&gt;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.&lt;/p&gt;

scholarly journals Effects of Decaying Hydraulic Conductivity on the Groundwater Flow Processes in a Managed Aquifer Recharge Area in an Alluvial Fan

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1649
Author(s):  
Peipeng Wu ◽  
Lijuan Zhang ◽  
Bin Chang ◽  
Shuhong Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Groundwater Flow ◽  
Artificial Recharge ◽  
Managed Aquifer Recharge ◽  
Alluvial Fan ◽  
Travel Times ◽  
Aquifer Recharge ◽  
Recharge Area ◽  
Flow Processes ◽  
Ambient Groundwater

Groundwater artificial recharge and medium characteristics represent the major factors in controlling the groundwater flow processes in managed aquifer recharge areas. According to the depositional features of alluvial fans, an analogous homogeneous phreatic sand tank aquifer and the corresponding inhomogeneous scale numerical models were established to investigate the groundwater flow under the combined influence of artificial recharge (human activities) and decaying hydraulic conductivity (medium characteristics). In this study, groundwater flow through a managed aquifer recharge area in an alluvial fan was analyzed under the conditions of decaying hydraulic conductivity (K) with depth or length from apex to apron. The results showed that groundwater flow processes induced by artificial recharge were significantly controlled by the increasing decay exponents of K. The decaying K with depth or length in alluvial fan areas expanded the degree of influence of artificial recharge on groundwater flow. With the increase of decay exponents, the flow directions gradually changed from a horizontal to vertical direction. Groundwater age and spatial variability could also be increased by the increasing decay exponents. The residence time distributions (RTDs) of ambient groundwater and artificially recharged water exhibited logarithmic, exponential, and power law behavior. Penetration depth and travel times of ambient groundwater flow could be affected by artificial recharge and decay exponents. Furthermore, with the increase of decay exponents, the thickness of the artificially recharged water lens and travel times of artificially recharged water were increased. These findings have important implications for the performance of managed aquifer recharge in alluvial fan areas as well as the importance of considering the gradual decrease of K with depth and length.

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