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MATHEMATICAL MODEL-BASED METHODOLOGY FOR CAPACITY ASSESSMENTS OF RADIAL WELL FIELDS PDF Print E-mail

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Title
Mathematical Model-Based Methodology for Capacity Assessments of Radial Wells at the Belgrade Groundwater Source

Authors
Đulija Boreli-Zdravković, MCE; Dr. Milenko Pušić; Dr. Milan Dimkić; Đorđije Božović; and Tibor Slimak

Clients
Serbian Ministry of Agriculture, Forestry and Water Management
Belgrade Public Water Supply and Sewerage Company

Beneficiaries
Ministry of Agriculture, Forestry and Water Management/Water Directorate
Belgrade Public Water Supply and Sewerage Company
Belgrade Land Development Agency
Jaroslav Černi Institute for the Development of Water Resources  

Completed in:
2009

Solution approved/applied by:
Ministry of Agriculture, Forestry and Water Management/Water Directorate
Belgrade Public Water Supply and Sewerage Company

Validation Procedure
Results were validated through a public presentation of outcomes of the “Study of the Belgrade Groundwater Source: Status and Developmental Directions”, which was held on 17 May 2010 on JCI’s premises, and included discussions with professionals in this field. Experts from the Ministry of Agriculture, Forestry and Water Management/Water Directorate, the Belgrade Land Development Agency, and the Belgrade Public Water Supply and Sewerage Company, a committee of professionals from the University of Belgrade (Schools of Civil Engineering, Mining and Geology, and Technology), and other eminent scientists in the field of water use and water protection, attended the presentation.

Applicability
The model can be used to simulate various well regeneration scenarios at the Belgrade Groundwater Source under different hydrologic conditions, by varying the time series which define boundary conditions.

Scope
Civil engineering, hydraulic constructions – general procedures and equipment – equipment – hydraulic models;
Development, protection and utilization of water resources.

Problem resolved:
Mathematical modeling enables significantly more reliable capacity assessments of locations where regeneration of water abstraction facilities is envisioned, and analyses of the potential effect of such projects on nearby facilities and the hinterland, under selected hydrological conditions. Accurate capacity assessments can lead to substantial cost savings. The model is open and can be upgraded by adding new information about the characteristics of the water-bearing medium at a micro-location, or by expanding the scope and improving the reliability of monitored data.

Extent to which this problem has been addressed globally:
The use of mathematical models of aquifers, which support large groundwater sources around the world, is quite extensive. Modeling of aquifers in hydraulic contact with rivers is highly complex and often addressed both at conferences dedicated to this topic and in leading groundwater journals. The models are adjusted to reflect natural conditions, available data, and issues which need to be resolved, and thus provide a unique interpretation of the area being studied.

Essence of the Concept
The hydrodynamic model of steady and unsteady groundwater flow within the Quaternary aquifer tapped by the Belgrade Groundwater Source was developed applying the Modflow Version 2000 software package, in the Groundwater Vistas Version 4 environment. Hydrologic data from over 2000 locations were used, and the geometry of model layers was defined using the Rockworks 14 database. The model is an outcome of the methodology applied to define the characteristics of water wells based on hydrodynamic, hydrochemical, and microbiological characteristics and procedures developed to assess locations.

The model was calibrated using 2005-2007 water well performance data, the Sava River stages, and groundwater levels, and was validated using 2008 data, a micro-model, and a specially-developed  Lizza software package. Of particular significance to this approach to capacity assessment were radial wells at which new laterals were installed in the Fall of 2007 and then carefully monitored over the course of the next eighteen months. Experience gained at these facilities, and monitoring data from high-capacity wells, indicated the need for introducing the effect of local anisotropy in the vicinity of the wells, the need for reduced discretization in the vertical direction (introduction of new layers), and the need for increased discretization in the horizontal plane (due to the effect of the large equivalent radius of the wells with new laterals). These options were built into the model, such that a new regional model of the aquifer in contact with the river was created, having specific micro-model options at locations which corresponded to the positions of the existing (or future) wells.  

Applicability
The model can be used for:

  • Simulation of hypothetical/preferred hydrologic scenarios and activities to be undertaken at the groundwater source;
  • Prediction of water levels at wells whose laterals are to be regenerated, for a pre-defined water level regime;
  • Assessments of the efficiency of measures and regeneration strategies for multiple wells within a portion of the groundwater source;
  • Preparation of background information and data for detailed models and well-lateral installation designs;
  • Activities within the scope of the international CC–Waters project;
  • Estimation of the rate of water inflow from the hinterland, as one of the analytical components in re-designating groundwater source protection zones.
 
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