3D Geological reconstructions for the development of geothematic layers useful for urban planning:El Papiol case study (Barcelona Metropolitan Area)

Roser Pi and Miquel Vilà (ICGC)23/02/2018

4th Meeting of the European 3D Geomodelling community

21st to 23rd February 2018

Orléans, France

INDEX

2

4th meeting of the European 3D GeoModelling Community

Introduction

3D geological reconstruction process

Application of the 3D model

Summary

INTRODUCTION: Study area

3

4th meeting of the European 3D GeoModelling Community

Metropolitan Area of Barcelona (AMB):~ 3.240.000 inhabitants636 km2 area36 municipalities

Study area:el Papiol18 km2

INTRODUCTION: Historical evolution

4

4th meeting of the European 3D GeoModelling Community

20181929

INTRODUCTION: Record of ground instabilities

5

4th meeting of the European 3D GeoModelling Community

INTRODUCTION: Workframe: GUAMB Papiol project

6

4th meeting of the European 3D GeoModelling Community

GEOLOGICAL BASIC LAYERSOutcropsBoreholesSamplesAnthropogenic depositsQuaternaryBasement3D modelInventory of ground instabilities

DERIVED INFORMATIONGeological related hazardsMining areas and aggregate extractionsGeochemistry levelsSoils capacityHydrogeologyEngineering conditionsSeismic responseGeological heritage

GEOLOGICAL HAZARD STUDY

PROJECT: Urban Geology of the Barcelona Metropolitan Area: el Papiol case study

3D MODELLING: Workflow

7

4th meeting of the European 3D GeoModelling Community

boreholes, outcrops, dtm, geophysical

data, previous maps and interpretations

Geological experience

Data

Conceptual geological

model

3D geological

reconstructions

UCGM map sheets Geological layers for

urban planning systems

3D MODELLING

Exploitationgeological maps, isopach maps,

cross sections

Georeferenced

3D data

Georeferencingdata in a 3D space

Assumptions

3D MODELLING: Information sources

8

4th meeting of the European 3D GeoModelling Community

OUTCROPS BOREHOLES GEOLOGICAL MAPPING(artificial, Quaternary, pre-Quaternary)

ALSO: Historiographic documentation, Topographic maps, Digital Terrain Models (DTM), Geophysical data

(H/V)

3D MODELLING: Surfaces to model

9

4th meeting of the European 3D GeoModelling Community

Artificial Pliocene

TriassicMiocene

Quaternary

Palaeozoic

3D MODELLING: Reconstruction technique

10

4th meeting of the European 3D GeoModelling Community

REGULAR GRID SURFACES

(Surfer)

SPARSE 3D FEATURES CONTOURN LINES

(MicroStation)

EXAMPLE: Base of the Quaternary deposits

3D MODELLING: Results

11

4th meeting of the European 3D GeoModelling Community

Art

ifici

al d

epos

itsM

ioce

ne

Qua

tern

ary

Tria

ssic

Plio

cene

These information was released as:

Contour maps

Deposit thickness maps

APPLICATIONS

12

4th meeting of the European 3D GeoModelling Community

Resources

Engineering

Hazards

3D

GEOLOGICAL

MODEL

APPLICATIONS: Resourcese.g. groundwater vulnerability layer

13

4th meeting of the European 3D GeoModelling Community

Groundwater base level

Properties of the aquifer media

Properties of the vadose zone media

GROUNDWATER VULNERABILITY

MODEL

(DRASTIC)

with Victor Camps

3D geological model

APPLICATIONS: Engineering e.g. excavatability layer

14

4th meeting of the European 3D GeoModelling Community

Surface

excavatability TERRAIN CONDITIONS TO EXCAVATABILITY

AT DIFFERENT ELEVATIONS

100 m elevation

High, easily ripable

High, ripable

Low, ripable with difficulty

Very low, predemolition

Very low, demolition

Water saturated terrain

75 m elevation 50 m elevation 25 m elevation 0 m elevation

with Ivan Garcia

APPLICATIONS: Hazardse.g. landslide hazard layer

15

4th meeting of the European 3D GeoModelling Community

Authomatic cross section (Terramodeler)

with Ivan Garcia, Ferran López, Marta González, Jordi Pinyol

MAP OF HAZARDS

ASSOCIATED TO LANDSLIDES

SUMMARY

16

4th meeting of the European 3D GeoModelling Community

Creation of a 3D Geological Model

Exploitation of the 3D model for the development of geothematic information related

to resources, engineering and hazards.

The base of the model: extensive regional geological knowledge and a large

amount of outcrop and borehole data

Methodology exportable for other urban areas (AMB or others)

Moving from a simple delivery of information to an effective geological survey

17

4th meeting of the European 3D GeoModelling Community

THANK YOU