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Groundwater Modelling Application for Waterworks
Tapesh Ajmera (TKAJ),Hydrogeologist Specialist
COWI India Pvt Ltd/COWI Denmarkhttp://www.cowiportal.com/Pages/home.aspx
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Outline
22 DECEMBER 2014
› COWI Services
› Overview of project
› Case study: Farup
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COWI Services-Hydrogeology
22 DECEMBER 2014WATER RESOURCES MANAGEMENT AND CLIMATE CHANGE IMPACTS ASSESSMENT
Groundwater modelling
Groundwater control system design
Site Investigation and characterization
Pumping / Slug Test
Multi-phase and multi-component numerical modelling in porous and fracture-
porous media
Surface and subsurface flow and solute transport modelling
Soil and groundwater remediation of contaminated sites
Rainfall-runoff modelling, and stage-discharge modelling
Statistical for hydrology and environmental data analysis
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Groundwater Modelling for Waterworks
Kortlægning uden for OSD – Midtjylland, Denmark
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Study Area: Waterworks area
Farup
Helgenaes
OvergaardGods
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Primary objective of project
› Develop a site-specific groundwater model based hydrogeological and hydrological inputs.
› Calibrate of groundwater model using PEST.
› Determine capture zone for each waterworks.
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Step for Model development
Collection of hydrological and hydrogeological
input
Prepared input file for model
Develop conceptual model
Model calibration based head observed, recharge, and
abstraction wells
Model for prediction (optimal hydraulic
conductivity) Import Qpermit as guidelines
Results: head distribution and capture zone of
waterworks
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Case Study: Farup
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Study Area: Farup
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Model Features› Model domain area: 122.17 km²
› Grid size: 100*100 m2
› Three-dimensional groundwater flow model developed in MODFLOW (GMS version 9.2).
› Model geology has been construct based regional Denmark groundwater model.
› Model consist of five hydro-stratigraphic layers and eight computational layers with specified hydraulic conductivity and porosity.
› Top and bottom elevation of each layer has been implemented based on field observed data.
› Total five pumping wells has implemented with specified well information. However, capture zone analysis has executed for one waterworks, which include only two abstraction wells such as well no. 58.367 and 58.399.
› The fixed head along the entire boundary in the limestone based on the filed observed data and no-flow boundaries in the other layers have implemented.
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Hydraulic Parameters for Groundwater Model
Layer Name Layer description Hydraulic conductivity (m/s)
Porosity (%)
Sand1(S1) Quaternary Sand 2 1e-5 30
Clay1(C1) Quaternary Clay separating QS2 and QS3
1e-7 25
Sand2(S2) Local Sand on top of QS4 1e-5 30
Clay(C2) Pre-quaternary clay 1e-8 25
Limestone (LS) Water-bearing part of the limestone
2e-4 20
Note: Vertical anisotropy ratio equal to 10 for all geological layer
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No. Well I.D X Y Z DVR90 Flow rate
(m³/d)
Top of ScreenDVR90
Bottom of
ScreenDVR90
1 58.367 552628 6266998 39.25 -284.93 -26.75 -31.75
2 58.399 552738 6267234 45.97 -284.93 -21.04 -38.04
3 58.279 553861 6266721 14.9 -460.27 14.7 -54.11
4 58.387 557555 6267519 51.61 -832.88 15.0 -26.43
5 58.403 561435 6270884 49.96 -191.78 -1.5 -30.0
Pumping Wells Information
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Recharge and Ground Topography variable recharge rate over the top surface
recharge rate varies from 221 mm/y to 430 mm/y
ground topography as DEM
Note: unit: m/d
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Geology
A A'
B'
B
Section A-A'
Section B-B'
Z magnification = 50
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PEST: Calibration
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Simulated Head
Layer-1 Layer-2
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Simulated Head
Layer-3 Layer-4
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Simulated Head
Layer-5 Layer-6
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Simulated Head
Layer-7 Layer-8
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Capture Zone
› Model: MODPATH
› One waterworks (2 wells)
› backwards tracking of particles
› no. of particle:10*10*10
› Within cell
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Team
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Hydrogeologist/Groundwater modeller SpecialistGroundwater and Geoscience Department,COWI India/COWI DenmarkEmail:[email protected] Ph.:+91-8826074442
Hydrogeologist/Groundwater modeller SpecialistGroundwater and Geoscience Department,COWI DenmarkEmail:[email protected]
Project Director & HOSGroundwater and Geoscience Department,COWI DenmarkEmail:[email protected]
Project Director,Groundwater and Geoscience Department,COWI DenmarkEmail:[email protected]
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