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DSD-INT 2018 Tidal propagation and salt intrusion in the multi-channel estuarine system of the Mekong Delta, Vietnam - Eslami Arab

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Presentation by Sepehr Eslami Arab, University of Utrecht, The Netherlands, at the Delft3D - User Days (Day 2: Hydrodynamics), during Delft Software Days - Edition 2018. Tuesday, 13 November 2018, Delft.

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DSD-INT 2018 Tidal propagation and salt intrusion in the multi-channel estuarine system of the Mekong Delta, Vietnam - Eslami Arab

  1. 1. Faculty of Geosciences RISE AND FALL: Tidal propagation and salt intrusion in the multi- channel estuarine system of the Mekong Delta, Vietnam Sepehr Eslami Maarten van der Vegt Nguyen Trung Nam Herman Kernkamp Arthur van Dam Piet Hoekstra 13 . Nov . 2018
  2. 2. Faculty of Geosciences CONTENT • Mekong Delta • Field Campaign • D-Flow FM modelling • Model Findings • Conclusions Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  3. 3. Faculty of Geosciences • 40-160Mt/yr of sediment Milliman & Fransworth (2011), Kummu et al. (2014), Nowacki et al. (2015), Darby et al. (2016), Vo et al. (2017), • 300 - 550 billion m3/yr fresh water • Seasonality NW SE Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  4. 4. Faculty of Geosciences The Mekong Delta Coumou & Minderhoud (2016) Minderhoud et. Al. (2017) • 2,5 million m3/day groundwater extraction • 80 million m3/day surface water extraction (1000 m3/Sec) Mekong River Bassac River Population 22 million 50% of Nation’s Food • Extensive agriculture & aquaculture Subsidence Water Quality Erosion Salt intrusion Flooding 4m tidal difference Smagjl et. Al. (2015) Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  5. 5. Faculty of Geosciences Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  6. 6. Faculty of Geosciences Measurement campaign Objective: • Measuring record salt intrusion Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  7. 7. Faculty of Geosciences Measurement campaign
  8. 8. Faculty of Geosciences
  9. 9. Faculty of Geosciences
  10. 10. Faculty of Geosciences Salt intrusion length 50km Nguyen & Savenije (2006) Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  11. 11. Faculty of Geosciences How did salinity change in time? Can Tho
  12. 12. Faculty of Geosciences What did we learn? • Salt intrusion responds to: 1. Discharge 2. Tidal variations 3. Subtidal variations a) Spring-neap cycle b) Wind-generated surge
  13. 13. Faculty of Geosciences Barotropic Modelling - 1D rivers and canals ▪ 1400 channels ▪ 4300 profiles - 54 Movable dams - Observation points - 1D & 2D (Vo et al. 2017) - Water demand - Offshore boundary Tidal + subtidal - Discharge upstream - Subtidal water level Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  14. 14. Faculty of Geosciences model calibration Outline R&F Proj. context Structure Part-1 Part-2 Part-3 Part-4 Progress
  15. 15. Faculty of Geosciences
  16. 16. Faculty of Geosciences
  17. 17. Faculty of Geosciences
  18. 18. Faculty of Geosciences
  19. 19. Faculty of Geosciences
  20. 20. Faculty of Geosciences
  21. 21. Faculty of Geosciences Tidal propagation Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  22. 22. Faculty of Geosciences Cumulative Discharge Division Article Fraction of main channel discharge Dinh An Tran De Nguyen et al. (2008) 70% 30% Nowacki et al. (2015) 40% 60% Xing et al. (2017) 94% 6% Our Calculation 60% 28% Mekong Delta Field campaign FM modelling Findings Conclusions Introduction 12% demand
  23. 23. Faculty of Geosciences Temporal Discharge Division Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  24. 24. Faculty of Geosciences Temporal Discharge Division, Sensitivity Analysis Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  25. 25. Faculty of Geosciences • The barotropic D-Flow FM model calibrated in the multi- channel estuarine system of the Mekong Delta. • Temporal discharge division can be dramatically different from cumulative discharge division. • During the dry season, tidal and subtidal water level play significant role in discharge division. • Discharge variations, during the dry season, are expected to significantly influence salt intrusion. Summary Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  26. 26. Faculty of Geosciences Temporal discharge division, Sensitivity analysis
  27. 27. Faculty of Geosciences , 80km ,180km Mekong Delta Field campaign FM modelling Findings Conclusions Introduction
  28. 28. Faculty of Geosciences Effect of secondary channels • The secondary channels ➢ 1% of the total volume • If we remove the secondary channels without re-calibration Mekong Delta Field campaign FM modelling Findings Conclusions Introduction

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