presentazione standard di powerpoint · major pumping stations for the water supply system maribor...
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FREEWAT (FREE and open source software tools for WATer resource management)
Final Meeting
September 20th – 22th 2017
IDAEA, CSIC Barcelona
Case study Vrbanski plato Slovenia
Irena Kopač (IEI), Matevž Vremec (IEI-UM)
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Objectives
Testing the flow model
o Diverse hydrological features
- dammed river, drainage, artificial recharge wih river bank
filtrate, river island
o Monitoring data
Testing the transport model
o Real life scenario -> oil spillage
- IEI contracted for complete remediation measures
- comparison with on-site data
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Geographical setting
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Major pumping stations for the water supplysystem
Maribor water supply is the largest in Slovenia (1300 km pipelines, 37 wells, 73 water storages, 79 pumping stations)
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Regulation of the water protection zone
Regulation of the water protection zone of a body of water aquifers Rus Vrbanski plateau Limbuškadobrave and Drava fields (Official Gazette of RS, Nos. 24/07 ,32/11 , 22/13 and 79/15 )
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Hydrodynamic conditions
Conceptual model
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Recharge with river bank filtrate
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Existing wells
Existing wells
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Existing observing wells
Observing wells
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Planned second step of IRBF system
Wells in planned second step of groundwater recharge
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Steps and methods
1. Establishment and calibration of a 50 x 50 m steady-state model
2. Establishment and calibration of a 5 x 5 m steady-state model
I. Location of the groundwater divide during different scenarios ofpumping/recharging
3. Upgrade into a transient 5 x 5 m model
I. Location of the groundwater divide after the counstruction of theremediation wells
II. Particle tracking (MODPATH)
4. Upgrade into a transport model
I. Contamination areaII. Efficiency of the remediation wells
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Geometry of the domainHorizontal discretization
The investigated domain is 2250 m large and 6400 m long.
The domain is divided in 5 m x 5 m cells.
The horizontal grid consists of 450 rows and 1280 columns.
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Geometry of the domainVertical discretization
The sandy aquifer is represented by one model layer, whose thicknessranges from 0.2 m to 44 m.
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Geometry of the domain
aquifer bottom
terrain
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Summary of Model Setting
The groundwater flow model has the following features:-Model layer is unconfined, ranging in thicknes from 0.2 m to 44 m
-Horizontal hydraulic conductivity (Kx and Ky ) are in the range 6 - 300 m/day
-Vertical hydraulic conductivity: Kz = Kx/10 m/day.
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Boundary conditions
The groundwater model has the following boundary conditions:- Inactive cells located in the northern part of the domain
- Assigned head on northern south-east boundary: package CHD
- River infiltration and drainage with package RIV
- Drainage on the south-west boundary by package DRN.
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RIVER package
The geometry of the river bottom was determined on the basis of measurements of the cross sections of the reservoir from the HEPP Maribors island to Melje dam
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Sink and source terms
The next hydrological sink and source terms were taken intoaccount:• WEL package simulating pumping and recharge wells in the area of thepumping station Vrbanski plato and two remediation wells constructed in thearea of the fuel oil spillage,
• RCH package simulating the rainfall infiltration.
Inactive cells
Rain infiltration [mm/year]:110 – intense urban area
110 – less intense green areas
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WELL package
• 15 extraction wells in the area of the pumping station Vrbanski plato
• 3 extraction wells in the area of Maribor island
• 2 recharge wells and 2 remediation wells
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Model calibration
Model validation
Used piezometers:
Inactive cells
Inactive cells
For calibration
Deviations
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Scenarios of the 50 x 50 m and 5 x 5 m steady-state model
Simulation Pumping on Mariborski otok Pumping on Vrbanski plato
Average values
Maximum values
Average values
Maximum values
Maximum values
Average values
Mariborski otok
Vrbanski plato
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Results of the 50 x 50 m and 5 x 5 m steady-state model
Model simulation Scenario 1
Scenario 3Scenario 2
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Location of the oil spillage
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Oil spillage – location of remediation wells
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Remedial measures
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Time course
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Time discretization
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Results of the 5 x 5 m transient model
Inactive cellsLocation of remediation wellsLocaiton of the GW divide before the constructionLocaiton of the GW divide after the constructionGroundwater level before the constructionGroundwater level before the construction
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Particle tracking using MODPATH
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Particle tracking using MODPATH
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Eveluating the efficiency of the remediationwells
WELL cells for remediaton wells
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Results of the 5 x 5 m transport model
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Results of the 5 x 5 m transport model
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FREEWAT in the future
University of Mariboro Part of a regular curriculumo 2 master thesis and planned new ones (University of Ljubljana)
Vrbanski plato o Inter-municipalities agency for environmental protectiono Maribor Water Supply company
Collaboration with Slovenian Environmental Agency,Environmental Protection College Velenje, Faculty of Natural sciences and
Engineering Ljubljana, Department of Geology
Combining water resources modeling and management with hydraulicmanagement
QGIS/ FREEWAT + EPANET
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Thank you for your attention!