DSD-INT 2016 iMOD-SEAWAT for groundwater in the coastal zone - Oude Essink

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Presentation by Gualbert Oude Essink (Deltares) at the iMOD International User Day, during Delft Software Days 2016. Tuesday 1 November 2016, Delft.

Software

iMOD-SEAWAT for Groundwater in the coastal zone
Gualbert Oude Essink
Deltares & Utrecht University
gualbert.oudeessink@deltares.nl
More information:
freshsalt.deltares.nl
zoetzout.deltares.nl
DSD 2016

Threaths to deltas worldwide:
subsidence, salinisation, depletion, sealing, sea level rise, CC
DSD 2016
1/3 of the world population lives in the
coastal zone

DSD 2016
http://flood.firetree.net
Mississippi, USA
Nederland
Nile delta, Egypt
Mekong deltaBangladesh
Jakarta, Indonesia
Myanmar, Ayeyarwady

Salinisation processes at local scale
Upconing low-lying area
Shallow rainwaterlens
Upconing extraction Salt water intrusion surface water
Salt water intrusion groundwater Inundation saline seawater
DSD 2016

Serious overexploitation aquifers worldwide
20160524 Ara Sul
Murcia, Spanje
Bangkok, Vietnam

3D Regional coastal groundwater model studies
Bangladesh, coastal plain
Modelling:
• variable-density groundwater flow, coupled solute transport
Simulating effects of:
• autonomous processes (change extraction rates)
• sea level rise, changing recharge pattern
• land subsidence
Quantifying:
• hydraulic head
• saline seepage / infiltration
• fresh groundwater resources DSD 2016

Numerical models groundwater coastal zone
DSD 2016
The Netherlands Nile Delta
Central part Bengal Delta
Mekong,
research just
started
Fresh GW Volume
million m3:
NL: ~1000000
Nile: ~450000
Extraction GW
million m3/year:
NL: ~1000
Nile: ~4000

NUS-Deltares project in Singapore
Jurong Island Groundwater Modeling and Risk Assessment Study
Monitoring and Modelling
SEAWAT module in iMOD
3D fresh-brackish-salt distribution groundwater
Esther van Baaren & Gualbert Oude Essink, DeltaresDSD 2016

iMOD-SEAWAT Jurong Island Singapore
DSD 2016
fresh groundwater
saline groundwater
Fresh water lens 5 years after construction artificial island
W E
solid rock
solid rock
saline groundwater
fresh groundwater
N S
Fresh water lens 5 years after construction artificial island
Time (years) after construction island
iMOD-solid module

SWIBANGLA
Managing Salt Water Impacts in Bangladesh
May 2013 – September 2014
Marta Faneca, Gijs Janssen, Gu Oude Essink, DeltaresDSD 2016

iMOD-SEAWAT to build a 3D variable-density grw. model
3D data as input, e.g. boreholes
to build up the subsurface:
aquifers and aquitards
ASCII’S as
input
E.g. surface
elevation
Analysis of the output as ASCIIS and 3D figures and data
sets
DSD 2016

3D modelling area Gent-Terneuzen (BE-NL)
Impacts of dredging, deepening, widening rivers/estuaries
on adjacent groundwater systems
Possible effects:
-saline fluxes to agricultural lands
-increased salinity in root zone
DSD 2016

Questions?
DSD 2016
Gualbert Oude Essink
Deltares & Utrecht University
gualbert.oudeessink@deltares.nl
More information:
freshsalt.deltares.nl
zoetzout.deltares.nl

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