Sasol Effluent Irrigation Workshopfred.csir.co.za/.../irrworkshop29nov_gwhandout.pdf · -2 0 2 4...
Transcript of Sasol Effluent Irrigation Workshopfred.csir.co.za/.../irrworkshop29nov_gwhandout.pdf · -2 0 2 4...
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Sasol Effluent Irrigation Sasol Effluent Irrigation WorkshopWorkshop
Groundwater Aspects (Numerical Modelling)29 November 2002
Louis Botha (JMA)
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TopicsTopics
Contamination StatusHydraulic CharacteristicsNumerical Modelling
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TopicsTopics
Contamination StatusHydraulic CharacteristicsNumerical Modelling
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Dam10Dam10
(Background: EC, Na, F)(Background: EC, Na, F)STATUSSTATUS
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IndabaIndaba GoedehoopGoedehoop
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Dam10Dam10 TRENDTREND
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IndabaIndaba GoedehoopGoedehoop
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TopicsTopics
Contamination StatusHydraulic CharacteristicsNumerical Modelling
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Dam10 (Medium Wet)Dam10 (Medium Wet)
Indaba (Dry)Indaba (Dry)
MiningMining
GoedehoopGoedehoop (Wet)(Wet)
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TopicsTopics
Contamination StatusHydraulic CharacteristicsNumerical Modelling
Pollution MechanismModelling ApproachModel Results
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Pollution MechanismPollution Mechanism
Overburden
Weathered Hard Rock
Fractured Hard Rock
Non-FracturedHard Rock
Zone
1:
Shal
low
Wea
ther
edZo
ne A
quife
r
Zone
2:
Dee
p Fr
actu
red
Aqu
ifer
Zone
3:
Dee
p N
on-
Frac
ture
d A
quife
r
12m
>35m
60m
80m
170mMine
0m
22m
80m
CHARACTERISED:CHARACTERISED:••Hydraulics (Hydraulics (HydrHydr. Conduct., . Conduct., StorativityStorativity, Porosity, …), Porosity, …)••Attenuation (Attenuation (DillutionDillution, , Diffusion, Dispersion, ChemicalDiffusion, Dispersion, ChemicalReactions, …)Reactions, …)
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Pollution MechanismPollution Mechanism
Overburden
Weathered Hard Rock
Fractured Hard Rock
Non-FracturedHard Rock
Zone
1:
Shal
low
Wea
ther
edZo
ne A
quife
r
Zone
2:
Dee
p Fr
actu
red
Aqu
ifer
Zone
3:
Dee
p N
on-
Frac
ture
d A
quife
r
12m
>35m
60m
80m
170mMine
0m
22m
80m
INFILTRATION:INFILTRATION:••VolumeVolume••TimeTime
?? ?? ?? ??
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-2
0
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4
6
-100
0
100
200
300
400
500
1998 1999 2000 2001 2002
REGM-13 REGM-44 REGM-45 CRD
Dam10
-2
0
2
4
6
-100
0
100
200
300
400
500
1998 1999 2000 2001 2002
REGM-13 REGM-44 REGM-45 CRD
Indaba
-0.5
0
0.5
1
1.5
2
-100
0
100
200
300
400
500
1998 1999 2000 2001 2002
REGM-28 REGM-30 CRD
Goedehoop
CRDCRD&&
Groundwater Groundwater LevelsLevels
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TopicsTopics
Contamination StatusHydraulic CharacteristicsNumerical Modelling
Pollution MechanismModelling ApproachModel Results
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Modelling Approach
OPTIONS:OPTIONS:••Water balance (Volume, Time => water level)Water balance (Volume, Time => water level)••Constant concentrationConstant concentration
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TopicsTopics
Contamination StatusHydraulic CharacteristicsNumerical Modelling
Pollution MechanismModelling ApproachModel Results
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Thank you for your attentionThank you for your attention