FROM PIEZOMETRIC MONITORING TO GROUNDWATER FLOODING RISK MANAGEMENT

Transcription

1 3 rd - 5 th July 2018 PAU, FRANCE FROM PIEZOMETRIC MONITORING TO GROUNDWATER FLOODING RISK MANAGEMENT DTN/SMTA/LMTE Sébastien MORILHAT sebastien.morilhat@cea.fr CEA 10 AVRIL 2012 PAGE 1

2 1. GENERAL PRESENTATION 1.1 THE CEA IN FRANCE Headquarters Civil nuclear Center (DEN) Military nuclear Center (DAM) o employees o PhD students o 4.2 M d of annual budget o 684 patents in JUILLET 2018 Cadarache Surface : 16 km² (~ 9 km² fenced) Facilities : 21 INB 1 INBS ~ 20 ICPE Staff : 5000 people

3 1. GENERAL PRESENTATION 1.2 LMTE HYDROGEOLOGICAL MISSIONS LMTE : Reference laboratory in hydrogeology for all the CEA Nuclear Energy Division (DEN) facilities Management of the piezometric park and hydrodynamic monitoring: o Drilling o Piezometer diagnostic, rehabilitation, fillers o Piezometric data acquisition and managment o Groundwater data control and verification Operational studies and expertise: o Flow modelling (substances transfer by groundwater) o Groundwater flooding risk (for both fast and slow hydrodynamic aquifers) o Liquefaction risks in case of earthquakes o Sizing of drainage device R&D program in hydrogeology: o Flow modelling developments o Benchmark of hydrogeology simulation tools : MARTHE, MODFLOW-MT3D, FEFLOW, HYTEC o Crisis tool design (GRENA, PERISCOP) o Geochemistry studies (radionuclides behaviour)

4 Pluviométrie Niveau piézométrique (cote NGF) 1. GENERAL PRESENTATION 1.3 SIMPLIFIED HYDROGEOLOGICAL CONTEXT OF THE CADARACHE CENTER Alluvial deposits (Quaternary) Sandstone (Miocene) Limestone (Cretaceous) BN02; BN04; PZ06 Quaternary Miocene Cretaceous 1 km 18 JUILLET 2018

5 2.1 HYDROGEOLOGICAL MONITORING NETWORK OF THE CADARACHE CENTER piezometers (180 with pressure sensor) Quaternary Miocene Cretaceous 4 piezometric stations (with remote transmission) 5 weather stations (with remote transmission) Large piezometric and weather data base LMTE develop its own tools PIEZO PERISCOP

6 2.2 «PIEZO» TOOL : GENERAL PERFORMANCES Quick toolbar 1) Manual readings import Visualisation data window Selection of graphic data Warning! 2) Raw fluctuation data import between manual readings Data ok! Check performed Data! ok! Setting data window 3) Barometric corrections 4) Anomaly évaluation 5) Drift correction 18 JUILLET 2018 Export data window Formating data window

7 Cote piézométrique [m NGF] Pluviométrie [mm/jours] 2.3 SCENARIO OF A EXTREME FLOOD BY GROUNDWATER RISING (WITHOUT PERISCOP) Piezometer Facilitie Alert level Effective rainfall Raw rainfall Groundwater level Too short to anticipate! T 0 T 1

8 2.4 «PERISCOP» TOOL : FLOOD PLATFORM ORGANISATION Piezometric data (in real time) GPRS GPRS Weather data Real time data PREVI-MISTRAU tool 4.5 days prediction T c Rain Monitoring and simulation Wind MECK (rain/level Model) ALERT 4.5 days forecast of the water table

9 2.5 «PERISCOP» TOOL : GENERAL PERFORMANCES Real time Measurements Forecasts Reconstitution Update PREVI-MISTRAU tool Rainfall data (mm) Temperature data ( C) 4.5 days Weather data forecasted (ETP computation) Groundwater level (m NGF) Max piezometric level simulated MECK tool

10 Cote piézométrique [m NGF] Pluviométrie [mm/jours] 2.6 SCENARIO OF A EXTREME FLOOD BY GROUNDWATER RISING (WITH PERISCOP) PREVI-MISTRAU PERISCOP Piezometer Security Facilitie Emergency pumps Alert level Effective rainfall data Raw rainfall data Simulated warning level Simulated groundwater level Measured groundwater level Flood anticipated = reinforced security! T 0 3 days T 0 2 days T 0 1 days

11 Thank you for your attention! PAGE 11 CEA 10 AVRIL JUILLET 2018 Commissariat à l énergie atomique et aux énergies alternatives Centre de Cadarache DTN/DIR bt Saint-Paul lez Durance T. +33 (0) F. +33 (0) Etablissement public à caractère industriel et commercial RCS Paris B DiEN DTN SMTA LMTE