Zoet-zout inversie, enkele modelresultaten Gualbert Oude Essink Unit Soil and Groundwater Systems Deltares, The Netherlands
Jan 03, 2016
Zoet-zout inversie, enkele modelresultaten
Gualbert Oude Essink
Unit Soil and Groundwater Systems
Deltares, The Netherlands
Grid convergence
Time step
Salt water pocket in a fresh environment
Salt water pocket in a fresh environment (I)
cases
Effect of discretisation on a ‘salt lake problem’
Salt water pocket in a fresh environment (I)
cases
Effect of discretisation on a ‘salt lake problem’
Salt water pocket in a fresh environment (II)
cases
Effect of discretisation
Salt water pocket in a fresh environment (II)
cases
Effect of discretisation
Salt water pocket in a fresh environment (III)
cases
Effect of discretisation
Salt water pocket in a fresh environment (III)
cases
Effect of discretisation
Salt water pocket in a fresh environment (IV)
cases
Effect of discretisation
Salt water pocket in a fresh environment (IV)
cases
Effect of discretisation
Salt water pocket in a fresh environment (V)
cases
Effect of discretisation
Salt water pocket in a fresh environment (VI)
cases
Conclusion:
• For some physical processes, a large number of cells is necessary
• Check always grid convergence!
Sri LankaSome days after December 26th, 2004
Impact of the 26-12-04 Tsunami on groundwater systems
Impact of the 26-12-04 Tsunami on groundwater systems
Impression of relevant salinisation processes by conceptualmodels of salt water intrusion in coastal aquifers:
1. Fingering processes in the subsoil2. Evolution of a freshwater lens after flooding by sea water3. Freshwater lens in a coastal aquifer with a brackish lagoon
Next step: quantifying processes in real situations, using topographic and hydrogeological data, and ending up with vulnerability maps
Concept 1: Fingering processes in the subsoil
Case Sri Lanka: lagoon setting fingering processes
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 1: Fingering processes in the subsoil
Concept 2: Evolution of a freshwater lens after flooding
Concept 2: Evolution of a freshwater lens after flooding
Concept 2: Evolution of a freshwater lens after flooding
Concept 2: Evolution of a freshwater lens after flooding
Concept 3: Freshwater lens in a coastal aquifer
with a brackish lagoon
Case Sri Lanka: lagoon setting
Concept 3: Freshwater lens in a coastal aquifer
with a brackish lagoon
Concept 3: Freshwater lens in a coastal aquifer
with a brackish lagoon
Impact of the 2004 Tsumani on the salt concentration in a coastal groundwater system, Sri Lanka
0
100
200
300
400
500
600
-0.4 0.1 0.6 1.1 1.6 2.1 2.6 3.1 3.6 4.1 4.6
Time (years)
Sol
ute
conc
entr
atio
n (m
g C
l-/l)
A. 0.7m -MSL,x=1987.5m
B. 4.9m -MSL,x=1987.5m
C. 0.3m -MSL,x=2112.5m
D. 0.3m -MSL,x=2237.5m
Tsunami characteristics: height 3 m, duration 2 hours
Concept 3: Freshwater lens in a coastal aquifer
with a brackish lagoon