Recent iMOD-SEAWAT-MT3D developments
Gualbert Oude Essink
Jarno Verkaik
Gijs Janssen
iMOD International User Day
Delft Software Days, 31 October 2017
• iMOD-SEAWAT + iMOD-MT3D towards Open Source
• iMOD-SEAWAT parallel
• (coupling groundwater salt water intrusion + land subsidence)
• 3D cases on salt water intrusion
20171031 DSD
San Joachim Valley, CA, USA
Coupling processes: SWI GW+SW+subsidence
SOBEK/Delft3D-FM Resolution: Order of minutes
Developer: Deltares
MODFLOW Resolution: Order of days
Developer: USGS
SEAWAT Resolution: Order of yrs (5-10)
Developer: USGS
SubCreep Resolution: Order of years
Developer: USGS/Deltares
Velocities Head/Pressure
output output
Ground water salinity
input
Output
Non-stationary subsidence
Velocities Water level
output
Salinity input
input
input
input
Conceptual delta model
diagram
Mekong Delta, VN, 2018
20171031 DSD
Groundwater age (years)
Examples iMOD-MT3D on 3 scale levels
Regional, gridresolution = 100x100m
Local, gridresolution = 10x10m
National,
gridresolution = 250x250m
Parallelisation heavy 3D SEAWAT models
20170929 UAE
speed up factor 14-20 and counting Rhine-Meuse-Scheldt
NL
BeNeKempen, NL
iMOD-SEAWAT parallel, work in progress
20171031 DSD
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2010 2020 2030 2040 2050
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m3]
Year [AD]
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ref
Threats to deltas worldwide:
subsidence, salinisation, depletion, sealing, sea level rise, CC
20171031 DSD
1/3 of the world population lives in a
coastal zone
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
20171031 DSD
Combining salinisation processes coastal zone
20171031 DSD Prinos, 2014
20170929 UAE
National: fresh groundwater resources
Nile Delta, BD, Zuid-Holland
cell size=250m-3km
Different model cell sizes to consider several phenomena
Goal:
To take largest cell size possible to accurately model
relevant salinisation processes
Local: rainwaterlenses, heat-cold
Tholen, Schouwen-Duiveland
cell size=5-25m
Regional: Zeeland, Gujarat/India, Philippines
cell size=100m
Sub-local: fingering, salty sand boils Sri Lanka (Tsunami 2004), Zandmotor
cell size=1cm-1m
Examples 3D fresh-salt groundwater models
20171031 DSD
NUS-Deltares project in Singapore Jurong Island Groundwater Modelling and Risk Assessment Study
Monitoring and Modelling
SEAWAT module in iMOD
3D fresh-brackish-salt distribution groundwater
Esther van Baaren & Gualbert Oude Essink, Deltares 20171031 DSD
iMOD-SEAWAT Jurong Island Singapore
20171031 DSD
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
Deltares project “Pilot Botlek” in Port of Rotterdam:
Mega Site Approach
supported by contaminant transport modelling
MT3DMS module in iMOD
3D multispecies reactive solute transport modelling
Gijs Janssen and Annemieke Marsman, Deltares 20171031 DSD
iMOD-MT3DMS Port of Rotterdam
20171031 DSD
fresh groundwater
saline groundwater
saline groundwater
fresh groundwater
3D CONTAMINANT PLUME INSPECTION IN iMOD
Groundwater extraction from thin freshwater lens
6 december 2017
Case Red River delta, Vietnam, using only global data
Digital Elevation Model
(DEM)
NASA Shuttle Radar Topographic Mission (SRTM)
Ocean Bathymetry Data General Bathymetric Chart of the Oceans (GEBCO)
Bedrock An estimation from Daniel Zamrsky - PhD researcher
attached to Deltares and Utrecht University
River Network
Hydrological data and maps based on SHuttle
Elevation Derivatives at multiple Scales
(HydroSHEDS)
Land Use Global Land Cover Share database
Population Density Gridded Population of the World (GPW) – 4th version
(GPWv4)
Borehole Log Data Winkel et al., 2011
Aquifer property
parameters
Wagner et. al., 2011; Van Pham and Lee, 2014
Pumping data Bui et al., 2011; Bui et al., 2012; Norrman et al., 2015
Case Red River delta, Ha Noi, Vietnam
SWIBANGLA
Managing Salt Water Impacts in Bangladesh
May 2013 – September 2014
Marta Faneca, Gijs Janssen, Gu Oude Essink, Deltares 20171031 DSD
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
20171031 DSD
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
20171031 DSD