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

Vo

lum

e f

resh

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wate

r [M

m3]

Year [AD]

variant3

variant1

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