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TRANSCRIPT
USE OF ELECTRICAL
RESISTIVITY
TOMOGRAPHY FOR
MAR: CASE-STUDIES IN
ALGARVE
Rogério Mota (LNEC)
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 2
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Main objetives:
To assess geological conditions of selected locations for MAR demo sites
To perform time-lapse resistivity tomography monitoring during NaCl tracer
tests
Projects and sites studied:
GABARDINE – Conceição and rio Seco (time-lapse)
PROWATERMAN – ribeiro Meirinho (two sites) and Cerro do Bardo
MARSOL - Cerro do Bardo (time-lapse)
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 3
Use of electrical resistivity tomography for MAR: case-studies in Algarve
GABARDINE
Conceição site assessment
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 4
Rio Seco
S N
W1
DD
Discussion
Profile W1 (200m)
North South
Profile W3 (195m)
Profile W2 (200m)
Profile DD (195m)
Profile W4 (180m)
Top soil (0-2 m depth)
(high clay content)
Miocene
Gravel (2-6m depth)
Use of electrical resistivity tomography for MAR: case-studies in Algarve N
LNEC | 5
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 6
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Results:
High clay content discarded location
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 7
Use of electrical resistivity tomography for MAR: case-studies in Algarve
PROWATERMAN
Ribeiro Meirinho and Cerro
do Bardo
ATIVIDADES HUMANAS E A QUALIDADE DA ÁGUA
SUBTERRÂNEA DO AQUÍFERO QUERENÇA-SILVES
LNEC | 8
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015
ATIVIDADES HUMANAS E A QUALIDADE DA ÁGUA
SUBTERRÂNEA DO AQUÍFERO QUERENÇA-SILVES
well
LNEC | 9
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015
Profile Algoz 1
Profile Algoz 2
ATIVIDADES HUMANAS E A QUALIDADE DA ÁGUA
SUBTERRÂNEA DO AQUÍFERO QUERENÇA-SILVES
well
LNEC | 10
N
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015
Profile Algoz 3
Profile Algoz 4
ATIVIDADES HUMANAS E A QUALIDADE DA ÁGUA
SUBTERRÂNEA DO AQUÍFERO QUERENÇA-SILVES
well
sinkholes
weir
LNEC | 11
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Cerro do Bardo
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015
Profile Algoz 5
Profile Algoz 6
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 12
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Results:
Selection of Cerro do Bardo site as a promising MAR location
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 13
Use of electrical resistivity tomography for MAR: case-studies in Algarve
GABARDINE
Rio Seco – time lapse with tracer test
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 14
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Profile I
SN IVII
IIIV
Profile II
Profile III
Profile IV
Profile V
W E
Profile VI Profile VII After water injection
Reference (before water injection) – Profiles I to V
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 15
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Traçador
salino
Cota Iteração 5, RMS=20,5 %
Cota Iteração 5, RMS=13,6 %
Cota Iteração 5, RMS=6,2 %
Cota Iteração 5, RMS=9,1 %
Cota Iteração 5, RMS=9,1 %
Cota Iteração 5, RMS=15,1 %
Cota Iteração 5, RMS=14,9 %
Cota Iteração 5, RMS=16,5 %
Cota Iteração 5, RMS=6,5 %
Cota Iteração 5, RMS=4,6 %
Cota Iteração 5, RMS=22,5 %
Resistividade (ohm.m)
L2 L1
Salt plume
Reference before water injection
May 7 (with water & no salt in
downstream basin)
May 8 (10:55) (start water injection
after spreading salt over the all
surface of the infiltration basin)
May 8 (17:15)
May 9 (8:30)
May 9 (16:31)
May 10 (8:35)
May 10 (17:00)
May 11 (14:00) (stop water injection)
May 18
Profile I
Infiltration basins
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 16
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Results:
Identification of subsurface water flow direction
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 17
Use of electrical resistivity tomography for MAR: case-studies in Algarve
MARSOL
Cerro do Bardo – time-lapse with tracer test
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 18
Use of electrical resistivity tomography for MAR: case-studies in Algarve
weir
PROWATERMAN
0
400
P1 P1
LNEC | 19
Reference
day+1
(02h50 after begin
of salt+water
injection)
day+2
(1day+0h50 after begin of
salt+water injection)
day+3
(2days+0h30 after
begin of salt+water
injection)
day+4
(3days+0h20 after begin
of salt+water injection)
initial w.l.
initial w.l.
max w.l. after water+salt injection
Injection
well
sinkhole
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 20
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P1 - Resistivity difference between tracer injection day+1 profile and the reference profile
sinkhole
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 21
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P1 - Resistivity difference between tracer injection day+2 profile and the reference profile
sinkhole
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 22
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P1 - Resistivity difference between tracer injection day+3 profile and the reference profile
sinkhole
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 23
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P1 - Resistivity difference between tracer injection day+4 profile and the reference profile
LNEC | 24
initial w.l.
initial w.l.
max w.l. after water+salt injection
P2 Injection
well
Reference
day+1
(23h10 after begin
of salt+water
injection)
day+2
(1day+22h55 after
begin of salt+water
injection)
day+3
(2days+22h50 after begin
of salt+water injection)
river
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 25
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Orange trees
initial w.l.
max w.l.
P2 - Resistivity difference between tracer injection day+1 profile and the reference profile
river
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 26
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Orange trees
initial w.l.
max w.l.
P2 - Resistivity difference between tracer injection day+2 profile and the reference profile
Orange trees
river
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 27
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P2 - Resistivity difference between tracer injection day+3 profile and the reference profile
P3
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 28
initial w.l.
initial w.l.
max w.l. after water+salt injection
Injection well
Reference
day+1
(05h30 after begin of
salt+water injection)
day+2
(1day+4h15 after
begin of salt+water
injection)
day+3
(2days+5h05 after
begin of salt+water
injection)
day+4
(3days+2h00 after
begin of salt+water
injection)
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 29
Use of electrical resistivity tomography for MAR: case-studies in Algarve
well
MARSOL project – profile P3 - reference
PROWATERMAN project – profile Algoz 6
weir
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 30
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P3 - Resistivity difference between tracer injection day+1 profile and the reference profile
weir
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 31
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P3 - Resistivity difference between tracer injection day+2 profile and the reference profile
weir
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 32
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P3 - Resistivity difference between tracer injection day+3 profile and the reference profile
weir
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 33
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P3 - Resistivity difference between tracer injection day+3+1h profile and the reference profile
weir
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 34
Use of electrical resistivity tomography for MAR: case-studies in Algarve
initial w.l.
max w.l.
P3 - Resistivity difference between tracer injection day+4 profile and the reference profile
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 35
Use of electrical resistivity tomography for MAR: case-studies in Algarve
weir
PROWATERMAN
0
400
plume movement
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 36
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Results:
Identification of subsurface water flow direction
Water Quality Workshop – Algarve Demonstration Site – 24-26 June 2015 LNEC | 37
Use of electrical resistivity tomography for MAR: case-studies in Algarve
Thank you for your
attention