dsd-nl 2014 - geo klantendag - 4. modeling groundwater flow and piping under dikes and dams
TRANSCRIPT
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Modeling groundwater flow and piping
under dikes and dams
Groundwater flow simulator DgFlow
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DgFlow simulator
Project history
• Flood control 1202195
• Knowledge for climate 1201351
• DSC mwell 1205933
• WTI piping 1206013, 1207809, 1209435
• WTI macro stability 1206015, 1207808, 1209434
• WTI overtopping waves 1206016, 1207811, 1209437
Project aims
• tool for safety assessment (ringtoets, dam)
• dGeoFlow (mseep, mwell, watex) next to dGeoStability
• research tool
17 juni 2014
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17 juni 2014
DgFlow simulator
Processes
• Saturated and unsaturated groundwater flow
• Deformation of the subsurface and engineered slopes
• Backward erosion piping
Loading
• Hydraulic loading by surface water
• Meteorological loading by precipitation and evaporation
• Overtopping waves
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17 juni 2014
DgFlow simulator
Implementation
• Quasi-static formulation, steady state / transient, 1,2,3D
• Finite element method, implicit time integration
• C++ kernel, C# interface, Paraview visualization
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17 juni 2014
DgFlow interface
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17 juni 2014
DgFlow simulation
Water level
variation
head
seepage
precipitation
submerging
uplift
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17 juni 2014
DgFlow simulation
Water level
variation +
overtopping
head
seepage
precipitation
submerging
uplift (heave)
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Piping mechanism
17 juni 2014
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Piping mechanism
17 juni 2014
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Piping simulation
17 juni 2014
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Piping validation
Lab experiment
17 juni 2014
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Piping validation
Numerical experiment
17 juni 2014
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Developments
2D assessment tool
• flow modeling and monitoring
• generalization of Sellmeijer’s rule
• multilayer systems
• complex geometries
• heterogeneous fields
• inclined layers
3D research tool
• innovative techniques
• field scale experiments
• laboratory experiments
17 juni 2014
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Future developments
Assessment tool
• user interface
• mesh generator
• user manual
• verification
• validation
• benchmarks
• support
• link to dam and ringtoets
17 juni 2014
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Research questions
Piping mechanism
• sensitivity to model parameters
• heterogeneity of permeability and grain size
• grain size distribution
• primary and secondary erosion
• single or multiple channels
• 3d effects micro scale
Groundwater flow
• validation in the field
• update Van Genuchten material model
17 juni 2014