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Zoet-zout inversie, enkele modelresultaten Gualbert Oude Essink Unit Soil and Groundwater Systems Deltares, The Netherlands.

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Presentation on theme: "Zoet-zout inversie, enkele modelresultaten Gualbert Oude Essink Unit Soil and Groundwater Systems Deltares, The Netherlands."— Presentation transcript:

1 Zoet-zout inversie, enkele modelresultaten Gualbert Oude Essink Unit Soil and Groundwater Systems Deltares, The Netherlands

2 Grid convergence Time step Salt water pocket in a fresh environment

3 Salt water pocket in a fresh environment (I) cases Effect of discretisation on a ‘salt lake problem’

4 Salt water pocket in a fresh environment (I) cases Effect of discretisation on a ‘salt lake problem’

5 Salt water pocket in a fresh environment (II) cases Effect of discretisation

6 Salt water pocket in a fresh environment (II) cases Effect of discretisation

7 Salt water pocket in a fresh environment (III) cases Effect of discretisation

8 Salt water pocket in a fresh environment (III) cases Effect of discretisation

9 Salt water pocket in a fresh environment (IV) cases Effect of discretisation

10 Salt water pocket in a fresh environment (IV) cases Effect of discretisation

11 Salt water pocket in a fresh environment (V) cases Effect of discretisation

12 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!

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14 Sri Lanka Some days after December 26 th, 2004 Impact of the 26-12-04 Tsunami on groundwater systems

15 Impression of relevant salinisation processes by conceptual models of salt water intrusion in coastal aquifers: 1. 1.Fingering processes in the subsoil 2. 2.Evolution of a freshwater lens after flooding by sea water 3. 3.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

16 Concept 1: Fingering processes in the subsoil Case Sri Lanka: lagoon setting fingering processes

17 Concept 1: Fingering processes in the subsoil

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25 Concept 2: Evolution of a freshwater lens after flooding

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29 Concept 3: Freshwater lens in a coastal aquifer with a brackish lagoon Case Sri Lanka: lagoon setting

30 Concept 3: Freshwater lens in a coastal aquifer with a brackish lagoon

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