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DSD-INT 2018 Groundwater modelling in Colombia - Galvis Faneca

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Presentation by Marta Faneca Sanchez and Sandra Galvis Rodriquez (Deltares) at the iMOD International User Day 2018, during Delft Software Days - Edition 2018. Tuesday 13 November 2018, Delft.

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DSD-INT 2018 Groundwater modelling in Colombia - Galvis Faneca

  1. 1. Multiscale groundwater modelling with iMOD in Valle del Cauca, Colombia Sandra Galvis, Marta Faneca, Joost Delsman Deltares, The Netherlands 20181013
  2. 2. 1. Valle del Cauca
  3. 3. 1. Valle del Cauca
  4. 4. 2. Water authorities in Valle Regional environmental authority • Water management for the Valley • Partner in ESCACES 1, 2 and 3 • Partner in Aquifer Management Plan Cali (PMAA) Environmental Authority for Cali • Water management for the city • Partner in Aquifer Management Plan Cali (PMAA) ESCACES 1 ESCACES 2 ESCACES 3 PMAA Cali
  5. 5. 3. Regional - ESCACES 1 and 2
  6. 6. 3. Regional - ESCACES 1 and 2 A A’ B B’ A A’ B B’
  7. 7. 3. Regional - ESCACES 1 and 2 Numerical model  3 layers (100m x 100m)Conceptual model  4 layers
  8. 8. 3. Regional - ESCACES 1 and 2 Recharge • Estimated at the daily scale • 250 m x 250 m cells (2000 – 2015) • update in progress • Inputs • Land use • Root depth • Soil type and texture • Groundwater depth • Precipitation and evaporation interpolated maps (daily) • Runoff and infiltration • Recharge is estimated based on the soil column water balance including irrigation Average 2000-2009 300 - 600 mm/yr
  9. 9. 3. Regional - ESCACES 1 and 2 Hydraulic properties
  10. 10. 3. Regional - ESCACES 1 and 2 Pumping wells 440 Mm3/yr
  11. 11. 3. Regional - ESCACES 1 and 2 Pumping wells
  12. 12. 3. Regional - ESCACES 1 and 2 Model calibration
  13. 13. 3. Regional - ESCACES 1 and 2 Modelled groundwater heads
  14. 14. 4. Urban - PMAA Cali
  15. 15. 4. Urban - PMAA Cali: Conceptual model DBA + DBC = 11 Mm3 RD = 50 – 100 mm/yr  15 Mm3
  16. 16. 4. Urban - PMAA Cali: Vertical discretization 3 m 7 m 15 m A1 A2
  17. 17. 4. Urban - PMAA Cali: Additional data - Geology Additional information available: • Lithological columns • Cross sections with contact between rocks and sedimentary basin (based on VES).
  18. 18. 4. Urban - PMAA Cali – updated bedrock ESCACES PMAA DAGMA
  19. 19. Alluvial fan (upper) R. Cali Alluvial fan (lower) de R. Cali Alluvial plain R. Cauca Río Cauca Unidad A – 60m Unidad B – 50m Unidad C – 300 m A A A’ A’ Unidad B – 12m 4. Urban - PMAA Cali – updated Unidad B
  20. 20. Urban - PMAA Cali – in progress Recharge
  21. 21. Urban - PMAA Cali – in progress Other updates, changes in the urban model • Hydraulic properties – new data, finer layers • Rivers: New gauge stations • Rivers: Changes in river bed - conductance • Recharge/drainage from pipes… • Lateral recharge
  22. 22. Conclusions General conclusion 1. Multi scale modelling was possible with iMOD features 2. Having a validated regional model allows to underpin other important local process that would be mask otherwise. This improves the local model 3. New insights in the data and the model results make us re-think some of the initial decisions 4. Benefits in two directions – regional and local Regional models 1. The regional models represent the general conditions and flows of the groundwater system 2. The tools developed can support the daily, short-term, and long-term groundwater management 3. It is necessary to establish and maintain a consistent monitoring network with frequent measurements to follow the dynamics of the system and validate the models
  23. 23. Conclusions Local urban model 1. Change in scale • Geology – detailed mapping of alluvial fans, transition zone, lateral recharge? • Diffuse recharge 2. Additional urban processes need to be included • Recharge/drainage from pipes • Infiltration galleries • Canalization of river (river-aquifer interaction) 3. Contamination vulnerability of upper aquifer – service stations, etc
  24. 24. Questions? sandra.galvisrodriguez@deltares.nl

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