A parameterised 3D-Structure-Model for the state of Bremen (Germany)

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Edwina Holst
vor 6 Jahren
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1 A parameterised 3D-Structure-Model for the state of Bremen (Germany) An application for detailled groundwater flow and transport studies

2 Bremen Geography and Geology 3

3 Bremen Geography and Geology 4

4 Structual model- from the borehole to 3D-models 6 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Output Further application

Structual model Borehole database Quality standards 8 Q1-1154 Q2-1125 Q3-101 Q4- ~33.

Q3: => free boredata, certain limitations not all markers are suitable.

5 Structual model Borehole database Quality standards 8 Q Q Q3-101 Q4- ~33.000* Q1 Q2 => highest quality => used as reference boreholes in slices. => free boredata, proofed. Q3: => free boredata, certain limitations not all markers are suitable. Q4: => not proofed, low depth wells, automatically stratified, next stratigraphic horizon reached. *: no layers stop in qh: ~ Q5: => not implemented

6 Structual model- from the borehole to 3D-models 9 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and adjust surfaces Output Further application

7 Structual model- from the borehole to surfaces times extended high

8 Structual model- from the borehole to 3D-models 11 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and adjust surfaces Construct sgrids and solids Output Further application

9 Quaternary stratigraphic units in Bremerhaven 12 surface base layer to top layer associated by vertical projection stratigraphic units devided into TOP surf Layer Base surf equidistant layers geological heterogeneity total thickness 20- times extended high

10 Structual stratigraphic model sgrids 14 y x 100 TOP surf Layer Base surf 20- times extended high

11 Structual model- from the borehole to 3D-models 15 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and adjust surfaces Construct sgrids and solids Make the sgrid usable for further applications =>Parameterisation Output Further application

12 16 Structual stratigraphic model sgrids-cells parameters can be derived 100 m from the lithology as well x y logs, transmitted to cells TOP surf continous layer Layer Base surf regular cells conformable cellsize vertical resolution variable heat conductivity permeability chemical parameters 20- times extended high GD f B

13 Structual model sgrid Bremerhaven 17 transfer of parameter information by interpolation into space display the parameter with respect to spatial distribution y 100 m x TOP surf Layer Base surf

Structual model- from the borehole to 3D-models 18 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and

14 Structual model- from the borehole to 3D-models 18 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and adjust surfaces Construct sgrids and solids Make the sgrid usable for further applications =>Parameterisation Output Parameterised sgrids- for further models, virtual boreholes and slices Further application

15 3D Model Bremen-Bremerhaven Sgrid times extended high

16 3D Model Bremen-Bremerhaven Sgrid- slices everywhere 20 NW SE 20- times extended high

17 Structual model- from the borehole to 3D-models 21 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and adjust surfaces Construct sgrids and solids Make the sgrid usable for further applications =>Parameterisation Output Parameterised sgrids- for further models, virtual boreholes and slices Further Application 2D-applications derived from parameterised sgrids 2D spatial patterns (map): Web Map Services 3D-hydraulic and transport models

18 Applications derived from the 3D-model 22 Rainwater infiltration- enhance recharge Permeability of the uppermost layers, min. depth to groundwater table Building Ground Information about organic content in the uppermost layers Marsh areas are highly affected by settling Thermal conductivity Interpolated mean values for different depths Planning tool for BHE-systems

19 Geology - WMS Data information for administration 23

20 Structual model- from the borehole to 3D-models 24 Input Wells with stratigraphic markers: proofed and unproofed Slices Geological information about deep channels or salt diapirs Processing Build and adjust surfaces Construct sgrids and solids Make the sgrid usable for further applications =>Parameterisation Output Parameterised sgrids- for further models, virtual boreholes and slices Further Application 2D-applications derived from parameterised sgrids 2D spatial patterns (map): Web Map Services 3D-hydraulic and transport models

21 Structure based hydraulic modelling -> hydraulic modell based on structural model -> no calibration (as k-values come from geology) -> but verification Modflow imod FREEWAT State model for general predictions

22 Structure based hydraulic modelling refinement for local projects - transport of salt and (other) contaminants - impact of larger BHE systems

23 Structure based hydraulic modelling detailed voxel modells with random geology Model size: 440 x 720 m Cell size: 2,5 x 2,5 x 0,2 m 216 wells

24 Structure based hydraulic modelling detailed voxel modells with random geology Model size: 440 x 720 m Cell size: 2,5 x 2,5 x 0,2 m 216 wells virtual wells - at random locations - with random permeability - but with respect to present geology

25 Structure based hydraulic modelling detailed voxel modells with random geology - Simulation of reaction and transport in heterogeneous soils

26 30

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