ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”

Project Nr. 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

INVESTING IN YOUR FUTURE

Can we explain the SO42-

concentration by the observed occurrence of

gypsum and modelled groundwater flow?

Andis Kalvāns

ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”Project number 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

Problem definition

• May it be that the high [SO42-] in the SW

part of Latvia is a relict from geological past when groundwater flow patterns were different?

ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”Project number 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

Method

• Interpolation with radius 20 km (2E4 m)• [SO4

2-] – the maximum value observed in the sampling point for each strat of V0

• Gypsum – a thickness normalised index for each strat of V0: – If gyps as primary mineral, score: 3– If gyps as secondary mineral, score: 2– No gypsum, score: 1

Gyps in D3 st-el formations

Gyps in D3 og-kt formations

Gyps in D2 nr formation

Gypsum, D3 pl-dgSO42- in D3 pl-dgSO4

2-, D3 gj-am

D3 pl-dg formations

The SO42- in D3 gj-am formations

ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”Project number 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

W-E section along y = 6 280 km

D3 pl-dg

D3 gj-am

D2-3 ar-br

D2 nr*

SO42-

Gypsum

D3 pl-dg

D3 gj-am

D2-3 ar-br

D2 nr*

D3 pl-dg

D3 gj-am

D2-3 ar-br

ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”Project number 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

X=415+/-45km

Y=6285+/-10

D3st-el

D3 og-kt

D3 pl-dg

D3 gj-am

D2-3 ar-br

D2 nr*

SO42-, D3 gj-am

D3 pl-dg

D3 gj-am

D2-3 ar-br

Gyps

SO42-

ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”Project number 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

So what?

• Generally the observed SO42-

concentration in the groundwater can be well explained by the V0 model

• There is some water that seems to be formed at a time when different flow pattern persisted

• Tracer tests with score counting could provide some interesting statistics

ESF Project „Establishment of interdisciplinary scientist group and modelling system for groundwater research”Project number 2009/0212/1DP/1.1.1.2.0/09/APIA/VIAA/060

Thanks for Your attention!