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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
SHUVALOVO area First step GWFM
Integrating Geological Information in City Management to Prevent Environmental Risks
GeoInforMLIFE06 TCY/ROS/000267
Michel FasoliPiergiorgio Valentini, Roberta Donati
Province of MilanEnvironmental Information System DepartmentCentral Directorate Environmental Resources
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
1. Problem Definition
2. Conceptual Model
3. Mathematical Model
4. Numerical Formulation
5. Sensitivity Analysis
6. Calibration
7. Model Application
Modelling phases procedure
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Modelling phases procedure•Aims identification for modelling •Pilot area identification
•Collecting data about pilot area and regional area•Organizing data with GIS software first of all in an ArcMap project and then in a geodatabase with all original data e new data elaboration•Geological and hydrogeological data interpretation•Conceptual model definition
SOIL-GIS 2008
Definition of Modflow and MT3D input: grid cell dimensions, boundary conditions, layers geometry, permeability, recharge, withdrawals, porosity, pollutant concentration, ecc …
•Flow simulation with SOIL-GIS 2008•Transport simulation with SOIL-GIS 2008•Sensitivity analysis compared with K•Calibration limits compared with target wells
Application of the model in the case study after the calibration
PHASE 1
PHASE 2
PHASE 3
PHASE 5-6
PHASE 4
PHASE 7
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Conceptual model
All layers are continuous in the model !!!
GG1 cross-section
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Numerical formulationElevation data from:
• Altitude points• Boreholes (from
database and from sections)• Water levels• Daylight relief • isolines• Lakes fictitious • points• Top inter moraine
isolines• Prequaternary relief
isolines• Tops correction fictitious points
Top of prequaternaryis the bottom of 8
layer
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Numerical formulation Tops Elevation Table
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Numerical formulation
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Tops correction
• The interpolation for some layers (with few elevation points) gives problems of intersections between contiguous layers (see example in the next slide)
• In this case is necessary to put in some fictitious points to avoid the problem
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
In this example layer 8 bottom (below/green) intersects layer 8 top (above/grey) in three areas
Tops correction
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
3D Surfer representation
9 surfaces elevation
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
3D Surfer representation
9 surfaces elevation
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
3D Surfer representation
9 surfaces elevation
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Modelling methodology
ESRI grid for SOIL-GIS
Tables
3D Surfer grid
Geological andHydrogeological
interpretation Interpolation
GridConvert
GEODB
DatabaseShapefiles
Raster
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
GW aquifer Boundary conditions (layers 1-2-3)
Constant head Lakes as
constant head
Lakes as constant
head
Rivers
Rivers
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
IM aquifer Boundary conditions (layers 5-6-7)
Constant head
Constant head
?
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Discretization domain
Grid cells of 10-50 meters are the ideal to study Shuvalovo area and in particular the lakes, the most important elements to modelling.
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
In the next future …The next steps will be the definition of:
• permeability grids for each layers (we will simulate a situation with minimum K values and another with maximum K values);
• porosity grids estimate from K values;
• withdrawals grids (known or estimated);
• recharge grids (% infiltration);
• wells as control target.
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Permeability
K range
?
?
Is correct?
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Permeability
Dusty sand in Lithology.shpFine sand in Boreholes.mdb
?
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
PermeabilityVarious grain size sand
in Lithology.shpMedium grain size sand
in Boreholes.mdb
?
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Piezometry
Differences between GW_Water_level_max.shp in blue and Daylight_Relief.shp in black
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Piezometry
Differences between GW_Water_level_max.shp in blue and interpolation of GW boreholes maximum water level in red
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Piezometry
Differences between IM_Water_level_max.shp in blue and interpolation of IM boreholes minimum water level in red
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
DEM
Differences between Daylight_Relief.shp in black and interpolation of altitude points in red
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
Flow expected results
• Static and dynamic piezometric surface (checked with target control)
• Water exchange estimate between GW aquifer and IM aquifer according to reciprocal K values
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
To respect the future actions of the Province of Milan we need to know the data necessary for a complete flow and transport simulation
Future actions
?
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GeoInforM Project - LIFE06 TCY/ROS/0002673° Steering Committee – ST. Petersburg, 17th-18th April 2008
THANKS
for your precious attention !!!
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