scholarly journals Representation of water abstraction from a karst conduit with numerical discrete-continuum models

2014 ◽  
Vol 18 (1) ◽  
pp. 227-241 ◽  
Author(s):  
T. Reimann ◽  
M. Giese ◽  
T. Geyer ◽  
R. Liedl ◽  
J. C. Maréchal ◽  
...  
Keyword(s):  
Boundary Condition ◽  
Large Scale ◽  
Pumping Test ◽  
Karst Water ◽  
Karst Aquifers ◽  
Flow Process ◽  
Conduit Flow ◽  
Water Abstraction ◽  
Model Studies ◽  
Karst Conduit

Abstract. Karst aquifers are characterized by highly conductive conduit flow paths embedded in a less conductive fissured and fractured matrix, resulting in strong permeability contrasts with structured heterogeneity and anisotropy. Groundwater storage occurs predominantly in the fissured matrix. Hence, most mathematical karst models assume quasi-steady-state flow in conduits neglecting conduit-associated drainable storage (CADS). The concept of CADS considers storage volumes, where karst water is not part of the active flow system but hydraulically connected to conduits (for example karstic voids and large fractures). The disregard of conduit storage can be inappropriate when direct water abstraction from karst conduits occurs, e.g., large-scale pumping. In such cases, CADS may be relevant. Furthermore, the typical fixed-head boundary condition at the karst outlet can be inadequate for water abstraction scenarios because unhampered water inflow is possible. The objective of this work is to analyze the significance of CADS and flow-limited boundary conditions on the hydraulic behavior of karst aquifers in water abstraction scenarios. To this end, the numerical discrete-continuum model MODFLOW-2005 Conduit Flow Process Mode 1 (CFPM1) is enhanced to account for CADS. Additionally, a fixed-head limited-flow (FHLQ) boundary condition is added that limits inflow from constant head boundaries to a user-defined threshold. The effects and the proper functioning of these modifications are demonstrated by simplified model studies. Both enhancements, CADS and FHLQ boundary, are shown to be useful for water abstraction scenarios within karst aquifers. An idealized representation of a large-scale pumping test in a karst conduit is used to demonstrate that the enhanced CFPM1 is able to adequately represent water abstraction processes in both the conduits and the matrix of real karst systems, as illustrated by its application to the Cent Fonts karst system.

scholarly journals Representation of water abstraction from a karst conduit with numerical discrete-continuum models

2013 ◽  
Vol 10 (4) ◽  
pp. 4463-4487
Author(s):  
T. Reimann ◽  
M. Giese ◽  
T. Geyer ◽  
R. Liedl ◽  
J. C. Maréchal ◽  
...  
Keyword(s):  
Boundary Condition ◽  
Large Scale ◽  
Pumping Test ◽  
Karst Water ◽  
Karst Aquifers ◽  
Flow Process ◽  
Conduit Flow ◽  
Water Abstraction ◽  
Model Studies ◽  
Karst Conduit

Abstract. Karst aquifers are characterized by highly conductive conduit flow paths embedded in a less conductive fissured and fractured matrix resulting in strong permeability contrasts with structured heterogeneity and anisotropy. Groundwater storage occurs predominantly in the fissured matrix. Hence, most karst models assume quasi steady-state flow in conduits neglecting conduit associated drainable storage (CADS). The concept of CADS considers storage volumes, where karst water is not part of the active flow system but rather hydraulically connected to conduits (for example karstic voids and large fractures). The disregard of conduit storage can be inappropriate when direct water abstraction from karst conduits occurs, e.g. large scale pumping. In such cases, CADS may be relevant. Furthermore, the typical fixed head boundary condition at the karst outlet can be inadequate for water abstraction scenarios because unhampered water inflow is possible. The objective of this paper is to analyze the significance of CADS and flow-limited boundary conditions on the hydraulic behavior of karst aquifers in water abstraction scenarios. To this end, the numerical hybrid model MODFLOW-2005 Conduit Flow Process Mode 1 (CFPM1) is enhanced to account for CADS. Additionally, a fixed-head limited-flow (FHLQ) boundary condition is added that limits inflow from constant head boundaries to a user-defined threshold. The affect and proper functioning of these modifications is demonstrated by simplified model studies. Both enhancements, CAD storage and the FHLQ boundary, are shown to be useful for water abstraction scenarios within karst aquifers. An idealized representation of a large-scale pumping test in a karst conduit is used to demonstrate that the enhanced CFPM1 is potentially able to adequately represent water abstraction processes in both the conduits and the matrix of real karst systems.

scholarly journals An assessment of capacity of Brestovica – Klariči karst water supply (Slovenia)

2012 ◽  
Vol 41 (1) ◽  
Author(s):  
Janko Urbanc ◽  
Kim Mezga ◽  
Luca Zini
Keyword(s):  
Water Supply ◽  
Pumping Test ◽  
Tracer Test ◽  
Tracer Experiment ◽  
Karst Water ◽  
Geochemical Analysis ◽  
Chemical Quality ◽  
Karst Aquifers ◽  
Pumping Rate

In August 2008 an intensive pumping experiment was carried out in order to assess the capacity of Brestovica – Klarici water supply in summer conditions, and its chemical quality. Groundwater was pumped for a period of 30 days, from three wells at the Klarici pumping station, and from well B-10/06, with a common capacity of 470 L/s. The fact that pumping caused a decrease in the water table in well B-10/06 by only 17 cm at a pumping rate of 265 L/s suggests that larger quantities of groundwater could be pumped from this well. The tracer experiment, performed at the B-10/06 temporary pipeline discharge area, showed that no pumped water was returned to the area of the exploited wells during the pumping test. Tracer uranine, which had been injected at the effluent from the pumped water from the well, was detected only at the Sardos Spring. The intensive pumping resulted in changes in the chemical and isotopic composition of oxygen in the water, due to a greater impact of the water from the intergranular SocaRiver aquifer on the karst aquifer.The chemical quality of groundwater from well B-10/06 is adequate for the purpose of drinking water supply. The presence of bacteria in groundwater is typical of karst aquifers and the water needs to be disinfected for further use.Keywords: groundwater, Classical Karst, Brestovica – Klariči aquifer, pumping test, tracer test, geochemical analysis.

scholarly journals Environmental hydrochemical and stabile isotope methods used to characterise the relation between karst water and surface water

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
Romeo Eftimi ◽  
Tete Akiti ◽  
Sokrat Amataj ◽  
Ralf Benishke ◽  
Hans Zojer ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Large Scale ◽  
Total Hardness ◽  
Karst Water ◽  
Karst Aquifers ◽  
Water Conductivity ◽  
Altitude Effect ◽  
Classical Study ◽  
Recharge Sources ◽  
Stabile Isotope

Karst aquifers are characterized by high heterogeneity of groundwater flow. The classical study methods such as boreholes, pumping tests, and point observations give important data but cannot be extended to the entire aquifer. However the environmental hydrochemical and stabile isotope methods could give important information about large scale aquifer characterization. Some study examples from Albania, shown in this paper, demonstrate the successful application of the isotope methods, which are more powerful if applied in combination with hydrochemical ones, for the identification of the karst water recharge sources. Among the isotope methods the altitude effect seems to be more indicative for the solution of the problem concerned. For characterising the lithology of karst rocks and the physical aspects of karst aquifers (type of groundwater flow) the combined use of some hydrochemical parameters like the water conductivity, total hardness, ionic ratios rCa/ rMg, rSO4/r/mg, CO2 pressure and the indexes of calcite and (Sic) and of dolomite saturation (Sid), result very useful.

Network effect in shared supply chain platform value co-creation behavior in evolutionary game1

2021 ◽  
pp. 1-12
Author(s):  
Zou Xiaohong ◽  
Chen Jinlong ◽  
Gao Shuanping
Keyword(s):  
Boundary Condition ◽  
Supply Chain ◽  
Large Scale ◽  
Simulation Analysis ◽  
Supply And Demand ◽  
Evolutionary Game ◽  
Dynamic Game ◽  
Network Effect ◽  
Chain Model ◽  
The Cost

The shared supply chain model has provided new ideas for solving contradictions between supply and demand for large-scale standardized production by manufacturers and personalized demands of consumers. On the basis of a platform network effect perspective, this study constructs an evolutionary game model of value co-creation behavior for a shared supply chain platform and manufacturers, analyzes their evolutionary stable strategies, and uses numerical simulation analysis to further verify the model. The results revealed that the boundary condition for manufacturers to participate in value co-creation on a shared supply chain platform is that the net production cost of the manufacturers’ participation in the platform value co-creation must be less than that of nonparticipation. In addition, the boundary condition for the shared supply chain platform to actively participate in value co-creation is that the cost of the shared supply chain platform for active participation in value co-creation must be less than that of passive participation. Moreover, value co-creation behavior on the shared supply chain platform is a dynamic game interaction process between players with different benefit perceptions. Finally, the costs and benefits generated by the network effect can affect value co-creation on shared supply chain platforms.

Evaluation of the MODFLOW-2005 Conduit Flow Process

Ground Water ◽  
2010 ◽  
Vol 48 (4) ◽  
pp. 549-559 ◽  
Author(s):  
Melissa E. Hill ◽  
Mark T. Stewart ◽  
Angel Martin
Keyword(s):  
Flow Process ◽  
Conduit Flow

Hydrogeological Characterization Based on Long Term Groundwater Pressure Monitoring

2010 ◽  
Author(s):  
Shuji Daimaru ◽  
Ryuji Takeuchi ◽  
Masaki Takeda ◽  
Masayuki Ishibashi
Keyword(s):  
Phase I ◽  
Phase Ii ◽  
Large Scale ◽  
Pumping Test ◽  
Phase Iii ◽  
Pressure Monitoring ◽  
Energy Agency ◽  
Hydrogeological Characteristics ◽  
Under Construction

The Mizunami Underground Research Laboratory (MIU) is now under construction by the Japan Atomic Energy Agency in the Tono area of central Japan. The MIU project is being implemented in three overlapping Phases: Surface-based Investigation (Phase I), Construction (Phase II) and Operation (Phase III). The changes of groundwater pressure due to shaft excavation can be considered analogous to a large-scale pumping test. Therefore, there is the possibility that the site scale groundwater field (several km square) can be approximated by the long-term groundwater pressure monitoring data from Phase II. Based on the monitoring observations, hydrogeological characteristics were estimated using the s-log(t/r2) plot based on the Cooper-Jacob straight line method. Results of the s-log(t/r2) plots are as follows. The groundwater flow field around the MIU construction site is separated into domains by an impermeable fault. In other words, the fault is a hydraulic barrier. Hydraulic conductivity calculated from s-log(t/r2) plots are in the order of 1.0E−7(m/s). The above results from the long term monitoring during Phase II are a verification of the hydrogeological characteristics determined in the Phase I investigations.

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