Groundwater flow rate and contaminant migration in fissure-karstic aquifer of Opole Triassic system southwest Poland

2000 ◽  
Vol 39 (3-4) ◽  
pp. 384-389 ◽  
Author(s):  
J. Kryza ◽  
S. Staśko
Keyword(s):  
Groundwater Flow ◽  
Flow Rate ◽  
Karstic Aquifer ◽  
Contaminant Migration

scholarly journals Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

2019 ◽  
Vol 2019 ◽  
pp. 1-20 ◽  
Author(s):  
Bin Wang ◽  
Chuan-xin Rong ◽  
Jian Lin ◽  
Hua Cheng ◽  
Hai-bing Cai
Keyword(s):  
Temperature Field ◽  
Groundwater Flow ◽  
Flow Velocity ◽  
Flow Rate ◽  
Freezing Temperature ◽  
Freezing Process ◽  
Flow Rates ◽  
Porosity Reduction ◽  
Shaft Sinking ◽  
Large Flow

Taking into account moisture migration and heat change during the soil freezing process, as well as the influence of absolute porosity reduction on seepage during the freezing process, we construct a numerical model of hydrothermal coupling using laws of conservation of energy and mass. The model is verified by the results of large-scale laboratory tests. By applying the numerical calculation model to the formation of artificial shaft freezing temperature fields under the action of large-flow groundwater, we conclude that groundwater with flow rates of less than 5 m/d will not have a significant impact on the artificial freezing temperature field. The maximum flow rates that can be handled by single-row freezing pipes and double-row freezing pipes are 10 m/d and 20 m/d, respectively, during the process of freezing shaft sinking. By analyzing the variation of groundwater flow rate during freezing process, we find that the groundwater flow velocity can reach 5–7 times the initial flow velocity near the closure moment of the frozen wall. Finally, in light of the action characteristics of groundwater on the freezing temperature field, we make suggestions for optimal pipe and row spacing in freezing pipe arrangement.

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.

scholarly journals Variations in Groundwater Flow Rate at the KSM Well, a Most Sensitive Well to Earthquake Occurrences.

1994 ◽  
Vol 42 (3) ◽  
pp. 221-235 ◽  
Author(s):  
Yasunori Tohjima ◽  
George Igarashi ◽  
Hiroshi Wakita
Keyword(s):  
Groundwater Flow ◽  
Flow Rate

scholarly journals Experimental and Numerical Analysis on Hydraulic Characteristics of Coastal Aquifers with Seawall

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2343 ◽  
Author(s):  
Woo-Dong Lee ◽  
Young-Jae Yoo ◽  
Yeon-Myeong Jeong ◽  
Dong-Soo Hur
Keyword(s):  
Numerical Analysis ◽  
Pressure Gradient ◽  
Groundwater Flow ◽  
Seawater Intrusion ◽  
Flow Rate ◽  
Groundwater Level ◽  
Coastal Aquifers ◽  
Coastal Aquifer ◽  
Hydraulic Characteristics ◽  
Tank Experiment

In this study, hydraulic model experiments were conducted to measure the saltwater–freshwater equilibrium interface in a coastal aquifer with underground obstructions such as an impermeable seawall. To analyse the hydraulic characteristics inside the coastal aquifer, numerical analysis was conducted using a non-hydrostatic Navier-Stokes solver based on the Porous Body Model (PBM), which can directly analyse groundwater flow. A unique saltwater–freshwater equilibrium interface that does not appear in typical coastal aquifer analyses was observed in a sandy tank experiment. In the experiment, the rise of the groundwater level behind the seawall increased the pressure gradient and groundwater flow rate, causing the saltwater–freshwater interface to move towards the sea and a freshwater region to form on the seabed in front of the seawall. The numerical analysis enabled close examination of the groundwater level distribution, groundwater flow, seawater–freshwater interface, and pore water pressure characteristics of the coastal aquifer with underground obstructions. The sandy tank experiment also provided an understanding of the hydraulic characteristics of groundwater in the coastal aquifer with a seawall, which previously could not be accurately analysed. The experimental and analytical results demonstrated that the rise of groundwater level due to underground obstructions in the coastal aquifer increased the pressure gradient and groundwater flow rate and slowed seawater intrusion. This principle can be employed to sufficiently reduce seawater intrusion of coastal aquifers.

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