pegases meeting, dtu lingby 24-26 march 2003 pegase – pesticides in european groundwaters :...
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PEGASE’S meeting, DTU Lingby 24-26 March 2003PEGASE’S meeting, DTU Lingby 24-26 March 2003
PEGASE – Pesticides in European Groundwaters : PEGASE – Pesticides in European Groundwaters : detailled study of representative Aquifers and detailled study of representative Aquifers and Simulations of possible Evolution scenarios Simulations of possible Evolution scenarios
(European project 2000-2003)(European project 2000-2003)
Martigny Site (Switzerland)Martigny Site (Switzerland) : : Hydrogeological ContributionHydrogeological Contribution
Mahmoud Bouzelboudjen, Eric Di GioiaMahmoud Bouzelboudjen, Eric Di Gioia
University of Neuchâtel, Switzerland University of Neuchâtel, Switzerland
In collaboration with Kirsten Meiwirth & Marc SoutterIn collaboration with Kirsten Meiwirth & Marc Soutter Swiss Federal Institute of Technology Swiss Federal Institute of Technology
and Pascal Ornstein & Jean-Daniel Rouillerand Pascal Ornstein & Jean-Daniel RouillerCentre de Recherche Alpin, Sion, Switzerland Centre de Recherche Alpin, Sion, Switzerland
Prof. André Mermoud, PEGASE Swiss Team Leader, Prof. André Mermoud, PEGASE Swiss Team Leader, Swiss Federal Institute of Technology, LausanneSwiss Federal Institute of Technology, Lausanne
CONTENTSCONTENTS
• Situation and data
• Water table behavior
• 3D Groundwater modelling with Marthe
• Dataset provided
PEGASE Project (Martigny, Switzerland)
Scale 1: 25'000
0 500 1000 1500 2000 Meters
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Boreholes depth (m)
Rhône
Wells
Piezometer
Canal
Flood amortization basin
Hydrology network
Rhône river
Syndicat and Saillon-Fullycanals
Hydrogeological model areaModel 03 extended
Domestic
Industry
Agriculture
Wells for water supply
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5 - 10
10 - 15
15 - 20
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Topography at 1: 10'000 scale (Valais canton)
GIS and spatial database forgroundwater modelling
Pegase's hydrogeological spatial databasecreated with the help of P. Ornstein (CREALP, Sion)
Perugia (Italy) meeting, 31 May 2001Hydrogeological Center contribution
PEGASE Swiss team leaderSwiss Federal Institute of technology
Institute of Soil and Water ManagementProf. A. Mermoud
PEGASE Swiss subcontractorUniversity of Neuchâtel - Institut of Geology
Hydrogeological Center of NeuchâtelDr M. Bouzelboudjen
PEGASE - Pesticides in European Groundwaters:detailed study of representative Aquifers andSimulations of possible Evolution scenarios
(European project 2000-2003)
3D Groundwater Model :
Thickness [m]Permeability 10-4[m/s]
Upper Silt Upper Silt (86 boreholes)(86 boreholes) 3.50.5
Upper Gravel Upper Gravel (35 boreholes)(35 boreholes) 8.56.5
Middle Silt Middle Silt (24 boreholes)(24 boreholes) 6.00.6
Lower Gravel Lower Gravel (24 boreholes)(24 boreholes) 8.0 (cst)7.0
Thickness (M) of Upper Silt (Layer 1) and Upper gravel (Layer 2)
An evaluation of the amount of water, resulting from precipitation, on the study area surface gives for the period 1978-1998 as average value:
10.2 °C for temperature 570 mm/year for precipitation, 430 mm/year for evapotranspiration (Turk's formula) and, 140 mm/year for the potential effective precipitation
4.1 Aquifer system structure
Globally, the alluvial aquifer in the Martigny area can be compared to a highly continuous heterogeneous single layer (thick of15-20 m) with a permeability varying between 10-2 and 10-3 m/s. The aquifer is surmounted by a thin layer (1-3m) with a permeability varying between 10-4 and 10-6 m/s. Locally the aquifer contains intercalations of low permeability material (10-6 m/s).
Hydraulic Potential (m), High Water, July 1999
Hydraulic Potential (m), Low Water, Mach 1999
FullyD
FullyG
MAR
Rhône river and aquifer relations : examples
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Po
ten
tiel h
ydra
uliq
ue
(m
)
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0
Pré
cip
itatio
n (
mm
/jou
r)(S
tatio
n d
e M
art
ign
y)
Legende :
Fu llyD | R hone Fu llyD S6L | 2m Fu llyD S8L | 27m Fu llyD S10L | 37m
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Po
ten
tiel h
ydra
uliq
ue
(m
)
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Pré
cip
itatio
n (
mm
/jou
r)(S
tatio
n d
e M
art
ign
y)
Legende :
Fu llyG | R hone Fu llyG S5L | 3 m Fu llyG S4L | 28 m Fu llyG S1L | 45 m
S10L
S8L
S6L Rhône
S5L
S4L
S1L
Rhône
Fully D
Fully G
Legend :
Precipitations (in black)
Rhône river (in blue)
Piezometers (in red)
Rhône river and aquifer relations
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457
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463P
ote
ntie
l hyd
rau
liqu
e (
m)
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Pré
cip
itatio
n (
mm
/jou
r)(S
tatio
n d
e M
art
ign
y)
Legende :
S H G N 2024 | R hone M AR 4 | 280m M AR 2 | 1800m M AR 1 | 2400m
SHGN
2024
MAR4
MAR2
MAR1
Legend :
Precipitations
(in black)
Rhône river
(in blue)
Piezometers
(in red)
Rhône river and aquifer relations
Results of piezometric campaigns 1994 -2001 Results of piezometric campaigns 1994 -2001
Piezometric measurements were taken twice every year, in July (high water) and in February (low water). The interpretation of piezometric maps shows mainly that:
the aquifer general flow is parallel to the axis of the Rhône valley
in the Martigny area the Rhône infiltrates into the alluvial aquifer,
locally the main canals have a draining effect but recharge to the aquifer from canals can occur at specific
points at low water. The influence of valleysides is reduced.
Boundary conditions for 3D groundwater modelling (explanations in) :http://www.brgm.fr/pegase/compte%20rendus/martigny.ppt et ftp://sitelftp.unine.ch/Bouzelboudjen/Pegase_EU_Project_2002/
Martigny 3D Model (with Marthe Code) : Hydraulic Conductivity for upper gravel formation and for Rhône riverCell Size 50mx50m
Bleu : Rhône et
Canal du syndicat
Rouge : zone d ’étude de l ’infiltration des pesticides
Coupe N - SCoupe W - E
Martigny groundwater 3D Model (with Marthe code) : Simulated versus observed hydraulic potential - steady state, july 1999)
Martigny groundwater 3D Model (with Marthe code) : Simulated versus observed hydraulic potential – transient state, 1994-2001)
Martigny groundwater 3D Model (with Marthe code) : Simulated versus observed hydraulic potential – transient state, feb. 2001)
Martigny groundwater 3D Model (with Marthe code) : Particle tracking calculated from hydrodynamic model results (transient state, jul. 2001)
Pegase area (4 km2) : Piezometry and electric conductivity (May and July 2001), source : K. Meiwirth
Pegase area (4 km2) : Electric Conductivity observed (May and July 2001), source : K. Meiwirth