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Erin_UC_highdrain.in
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#Description: Redox ladder ation), with ELM CTC bgc sandboxes
# Rate constants estimated to show different processes
# srun -A ccsi -p burst -N 1 -n 1 -c 1 --mem=8g -t 00:30:00 --pty bash -i
# /home/omearata/models/pflotran-elm-interface/src/pflotran/pflotran -pflotranin Erin_UC.in
# Description: Simple microbial decomposition and dissolution to DOM network
# Rate constants estimated to show different processes
SIMULATION
SIMULATION_TYPE SUBSURFACE
PROCESS_MODELS
SUBSURFACE_FLOW flow
MODE GENERAL
OPTIONS
ARITHMETIC_GAS_DIFFUSIVE_DENSITY
ISOTHERMAL
REPLACE_INIT_PARAMS_ON_RESTART
/
/
SUBSURFACE_TRANSPORT
MODE GIRT
/
/
END
SUBSURFACE
#=========================== useful transport parameters =======================
REFERENCE_LIQUID_DENSITY 1.d3
#=========================== chemistry ========================================
CHEMISTRY
PRIMARY_SPECIES
#### NOTE: Beginning of auto-inserted primary species ####
DOM1
H+
O2(aq)
HCO3-
Fe+++
Fe++
NH4+
Tracer
Tracer2
Tracer3
CH4(aq)
Acetate-
H2(aq)
Mg++
Ca++
Na+
K+
#### NOTE: End of auto-inserted primary species ####
/
DECOUPLED_EQUILIBRIUM_REACTIONS
#### NOTE: Beginning of auto-inserted primary species ####
DOM1
H+
O2(aq)
HCO3-
Fe+++
Fe++
NH4+
Tracer
Tracer2
Tracer3
CH4(aq)
Acetate-
H2(aq)
Mg++
Ca++
Na+
K+
#### NOTE: End of auto-inserted primary species ####
/
SECONDARY_SPECIES
#### NOTE: Beginning of auto-inserted secondary species ####
CO2(aq)
OH-
FeCO3+
Fe(OH)4-
Acetic_acid(aq)
FeCH3COO+
FeIIIDOM1(aq)
FeIIDOM1(aq)
FeIIIAcetate(aq)
Fe(OH)2(aq)
FeCO3(aq)
CO3--
CaHCO3+
#### NOTE: End of auto-inserted secondary species ####
/
MINERALS
#### NOTE: Beginning of auto-inserted mineral species ####
Fe(OH)3
Fe(OH)2
Rock(s)
#### NOTE: End of auto-inserted mineral species ####
/
MINERAL_KINETICS
#### NOTE: Beginning of auto-inserted mineral kinetics ####
Fe(OH)3
RATE_CONSTANT 1.d-6 mol/m^2-sec
/
Fe(OH)2
RATE_CONSTANT 1.d-7 mol/m^2-sec
/
Rock(s)
RATE_CONSTANT 0.0 mol/m^2-sec
/
#### NOTE: End of auto-inserted mineral kinetics ####
/
IMMOBILE_SPECIES
#### NOTE: Beginning of auto-inserted immobile species ####
cellulose
HRimm
#### NOTE: End of auto-inserted immobile species ####
/
PASSIVE_GAS_SPECIES
#### NOTE: Beginning of auto-inserted gas species ####
CO2(g)
O2(g)
#### NOTE: End of auto-inserted gas species ####
/
SORPTION
#### NOTE: Beginning of auto-inserted sorption sites ####
SURFACE_COMPLEXATION_RXN
EQUILIBRIUM
MINERAL Rock(s)
SITE >Carboxylate- 1.00e+04
COMPLEXES
>Carboxylic_acid
/
/
ION_EXCHANGE_RXN
CEC 2.00e+03
CATIONS
Fe++ 1.00d-01
Fe+++ 3.00d-01
Mg++ 1.10e+00
Ca++ 4.10e+00
Na+ 1.00e+00 REFERENCE
K+ 9.00d-01
H+ 1.10e+00
/
/
/
#### NOTE: End of auto-inserted sorption sites ####
#### NOTE: Beginning of auto-inserted reactions ####
# fermentation
MICROBIAL_REACTION
REACTION 1.00e+00 DOM1 + 6.67e-01 H2O -> 3.33e-01 Acetate- + 3.33e-01 HCO3- + 6.67e-01 H+ + 6.67e-01 H2(aq) + 3.33e-01 Tracer
RATE_CONSTANT 6.00e-08
MONOD
SPECIES_NAME DOM1
HALF_SATURATION_CONSTANT 1.00e-01
THRESHOLD_CONCENTRATION 1.10e-15
/
INHIBITION
SPECIES_NAME O2(aq)
TYPE MONOD
INHIBITION_CONSTANT 1.00e-05
/
INHIBITION
SPECIES_NAME Acetate-
TYPE MONOD
INHIBITION_CONSTANT 4.00e-02
/
/
# DOM aerobic respiration
MICROBIAL_REACTION
REACTION 1.00e+00 DOM1 + 1.00e+00 O2(aq) + 1.00e+00 H2O -> 1.00e+00 HCO3- + 1.00e+00 H+ + 1.00e+00 Tracer
RATE_CONSTANT 1.80e-07
MONOD
SPECIES_NAME O2(aq)
HALF_SATURATION_CONSTANT 1.00e-04
THRESHOLD_CONCENTRATION 0.00e+00
/
MONOD
SPECIES_NAME DOM1
HALF_SATURATION_CONSTANT 1.00e-01
THRESHOLD_CONCENTRATION 1.10e-16
/
/
# Fe(II) abiotic oxidation
GENERAL_REACTION
REACTION 1.00e+00 Fe++ + 2.50e-01 O2(aq) + 1.00e+00 H+ <-> 1.00e+00 Fe+++ + 5.00e-01 H2O + Tracer3
FORWARD_RATE 1.00e-2 #1.00e-02
BACKWARD_RATE 0.00e-06
/
# Fe(II) microbial oxidation
MICROBIAL_REACTION
REACTION 1.00e+00 Fe++ + 2.50e-01 O2(aq) + 1.00e+00 H+ -> 1.00e+00 Fe+++ + 5.00e-01 H2O
RATE_CONSTANT 5.5e-05 !1.5e-06
MONOD
SPECIES_NAME O2(aq)
! HALF_SATURATION_CONSTANT 1.00e-04
HALF_SATURATION_CONSTANT 1.00e-08
THRESHOLD_CONCENTRATION 0.00e+00
/
MONOD
SPECIES_NAME Fe++
! HALF_SATURATION_CONSTANT 1.00e-01
HALF_SATURATION_CONSTANT 1.00e-04
THRESHOLD_CONCENTRATION 1.10e-15
/
/
# Hydrogenotrophic methanogenesis
MICROBIAL_REACTION
REACTION 4.00e+00 H2(aq) + 1.00e+00 HCO3- + 1.00e+00 H+ -> 1.00e+00 CH4(aq) + 3.00e+00 H2O
RATE_CONSTANT 7.2e-09
MONOD
SPECIES_NAME H2(aq)
HALF_SATURATION_CONSTANT 1.00e-01
THRESHOLD_CONCENTRATION 1.10e-15
/
MONOD
SPECIES_NAME HCO3-
HALF_SATURATION_CONSTANT 1.00e-01
THRESHOLD_CONCENTRATION 1.10e-15
/
INHIBITION
SPECIES_NAME O2(aq)
TYPE MONOD
INHIBITION_CONSTANT 1.00e-05
/
INHIBITION
SPECIES_NAME Fe+++
TYPE MONOD
INHIBITION_CONSTANT 1.00e-10
/
INHIBITION
SPECIES_NAME H+
TYPE MONOD
INHIBITION_CONSTANT 1.78e-07
/
/
# Acetate aerobic respiration
MICROBIAL_REACTION
REACTION 1.00e+00 Acetate- + 2.00e+00 O2(aq) -> 2.00e+00 HCO3- + 2.00e+00 H+ + 2.00e+00 Tracer
RATE_CONSTANT 3.00e-07
MONOD
SPECIES_NAME O2(aq)
HALF_SATURATION_CONSTANT 1.00e-04
THRESHOLD_CONCENTRATION 0.00e+00
/
MONOD
SPECIES_NAME Acetate-
HALF_SATURATION_CONSTANT 4.00e-02
THRESHOLD_CONCENTRATION 1.10e-16
/
/
# Hydrogen oxidation
MICROBIAL_REACTION
REACTION 2.00e+00 H2(aq) + 1.00e+00 O2(aq) -> 2.00e+00 H2O
RATE_CONSTANT 1.5e-06
MONOD
SPECIES_NAME H2(aq)
HALF_SATURATION_CONSTANT 1.00e-01
THRESHOLD_CONCENTRATION 1.10e-15
/
MONOD
SPECIES_NAME O2(aq)
HALF_SATURATION_CONSTANT 1.00e-04
THRESHOLD_CONCENTRATION 0.00e+00
/
/
# Fe(III) reduction
MICROBIAL_REACTION
REACTION 1.00e+00 Acetate- + 8.00e+00 Fe+++ + 4.00e+00 H2O -> 2.00e+00 HCO3- + 8.00e+00 Fe++ + 9.00e+00 H+ + 2.00e+00 Tracer
RATE_CONSTANT 2.25e-08
MONOD
SPECIES_NAME Acetate-
HALF_SATURATION_CONSTANT 4.00e-2 #4.00e-02
THRESHOLD_CONCENTRATION 1.10e-15
/
MONOD
SPECIES_NAME Fe+++
HALF_SATURATION_CONSTANT 1.00e-10
THRESHOLD_CONCENTRATION 1.10e-15
/
INHIBITION
SPECIES_NAME O2(aq)
TYPE MONOD
INHIBITION_CONSTANT 1.00e-05
/
/
# Ebullition
MICROBIAL_REACTION
REACTION 1.00e+00 CH4(aq) -> 1.00e+00 Tracer2
RATE_CONSTANT 3.00e-08
MONOD
SPECIES_NAME CH4(aq)
HALF_SATURATION_CONSTANT 4.00e-02
THRESHOLD_CONCENTRATION 1.10e-15
/
INHIBITION
SPECIES_NAME CH4(aq)
TYPE INVERSE_MONOD
INHIBITION_CONSTANT 2.5e-3
/
/
# Acetaclastic methanogenesis
MICROBIAL_REACTION
REACTION 1.00e+00 Acetate- + 1.00e+00 H2O -> 1.00e+00 CH4(aq) + 1.00e+00 HCO3- + 1.00e+00 Tracer
RATE_CONSTANT 1.5e-8
MONOD
SPECIES_NAME Acetate-
HALF_SATURATION_CONSTANT 4.00e-02
THRESHOLD_CONCENTRATION 1.10e-15
/
INHIBITION
SPECIES_NAME O2(aq)
TYPE MONOD
INHIBITION_CONSTANT 1.00e-5
/
INHIBITION
SPECIES_NAME Fe+++
TYPE MONOD
INHIBITION_CONSTANT 1.00e-10
/
INHIBITION
SPECIES_NAME H+
TYPE MONOD
INHIBITION_CONSTANT 2.88e-06
/
INHIBITION
SPECIES_NAME H+
TYPE INVERSE_MONOD
INHIBITION_CONSTANT 2.88e-06
/
/
skip
REACTION_SANDBOX
SOMDECOMP
POOLS
cellulose 50.00
DOM1 50.00
/
# Hydrolysis
REACTION
UPSTREAM_POOL cellulose
DOWNSTREAM_POOL DOM1 1.00e+00
TURNOVER_TIME 1.00d-08 y
INHIBITION
SPECIES_NAME DOM1
TYPE MONOD
INHIBITION_CONSTANT 1.00d-01
/
/
CO2_SPECIES_NAME Tracer
O2_SPECIES_NAME O2(aq)
/
/
noskip
#### NOTE: End of auto-inserted reactions ####
LOG_FORMULATION
TRUNCATE_CONCENTRATION 1.00d-25
DATABASE /home/omearata/TAI/hanford.dat
OUTPUT
PH
FREE_ION
O2(aq)
CH4(aq)
! DOM1
! NH4+
HCO3-
TOTAL
Fe++
Fe+++
DOM1
Tracer2
Tracer3
MINERALS
/
END
#=========================== transport constraints ============================
CONSTRAINT initial
IMMOBILE
#### NOTE: Beginning of auto-inserted immobile species ####
cellulose 8.00e+03
HRimm 1.00d-20
#### NOTE: End of auto-inserted immobile species ####
/
CONCENTRATIONS
#### NOTE: Beginning of auto-inserted concentration constraints ####
DOM1 5.00d-02
H+ 5.0 P
O2(aq) 2.d-4 T O2(g)
HCO3- 4.00d-6 T CO2(g)
Fe+++ 5.3d-5 M Fe(OH)3
Fe++ 2.4d-3 T Fe(OH)2
NH4+ 1.00d-15
Tracer 1.00d-15
Tracer2 1.00d-15
Tracer3 1.00d-15
CH4(aq) 1.00d-15
Acetate- 1.00d-15
H2(aq) 1.00d-15
Mg++ 5.00d-04
Ca++ 5.00d-04
Na+ 2.00d-03
K+ 2.00d-05
#### NOTE: End of auto-inserted concentration constraints ####
/
MINERALS
#### NOTE: Beginning of auto-inserted mineral constraints ####
Fe(OH)3 9.6d-6 1.d2 m^2/m^3
Fe(OH)2 7.2d-1 1.d2 m^2/m^3
Rock(s) 0.5 5.0e3 m^2/m^3
#### NOTE: End of auto-inserted mineral constraints ####
/
END
CONSTRAINT sed_air_interface
CONCENTRATIONS
#### NOTE: Beginning of auto-inserted concentration constraints ####
DOM1 5.00d-02
H+ 5.0 P
O2(aq) 0.2 G O2(g)
HCO3- 0.01 G CO2(g)
Fe+++ .37d-15 M Fe(OH)3
Fe++ 0.37d-15 M Fe(OH)2
NH4+ 1.00d-15
Tracer 1.00d-15
Tracer2 1.00d-15
Tracer3 1.00d-15
CH4(aq) 1.00d-15
Acetate- 1.00d-15
H2(aq) 1.00d-15
Mg++ 5.00d-15
Ca++ 5.00d-15
Na+ 2.00d-15
K+ 2.00d-15
#### NOTE: End of auto-inserted concentration constraints ####
/
MINERALS
#### NOTE: Beginning of auto-inserted mineral constraints ####
Fe(OH)3 0.875d-3 1.d2 m^2/m^3
Fe(OH)2 0.0d-20 1.d2 m^2/m^3
Rock(s) 0.5 5.0e3 m^2/m^3
#### NOTE: End of auto-inserted mineral constraints ####
/
END
CONSTRAINT drain
CONCENTRATIONS
#### NOTE: Beginning of auto-inserted concentration constraints ####
DOM1 1.00d-15
H+ 7.0 P
O2(aq) 1.00d-15 T O2(g)
HCO3- 1.00d-15 T CO2(g)
Fe+++ 1.00d-15 T Fe(OH)3
Fe++ 1.00d-15
NH4+ 1.00d-15
Tracer 1.00d-15
Tracer2 1.00d-15
Tracer3 1.00d-15
CH4(aq) 1.00d-15
Acetate- 1.00d-15
H2(aq) 1.00d-15
Mg++ 1.00d-15
Ca++ 1.00d-15
Na+ 1.00d-15
K+ 1.00d-15
#### NOTE: End of auto-inserted concentration constraints ####
/
END
CONSTRAINT recharge
CONCENTRATIONS
#### NOTE: Beginning of auto-inserted concentration constraints ####
DOM1 5.00d-20
H+ 7.0 P
O2(aq) 1.00d-15 T O2(g)
HCO3- 1.00d-15 T CO2(g)
Fe+++ 1.00d-15 T Fe(OH)3
Fe++ 0.37d-23
NH4+ 1.00d-25
Tracer 1.00d-25
Tracer2 1.00d-25
Tracer3 1.00d-25
CH4(aq) 1.00d-25
Acetate- 1.00d-25
H2(aq) 1.00d-25
Mg++ 5.00d-25
Ca++ 5.00d-25
Na+ 2.00d-25
K+ 2.00d-25
#### NOTE: End of auto-inserted concentration constraints ####
/
END
#=========================== solver options ===================================
NUMERICAL_METHODS TRANSPORT
! For single point sim, SOLVER DIRECT and other options commented out seems to work the best
LINEAR_SOLVER
SOLVER DIRECT
!SOLVER ITERATIVE ! default: ITERATIVE or KRYLOV: KSP_TYPE of BCGS and PC_TYPE of BJACOBI, if not modified below
!PC_TYPE JACOBI ! default (iterative): BJACOBI.
!KSP_TYPE fgmres ! default: BCGS. NOT much difference
END
NEWTON_SOLVER
ATOL 1.d-20
RTOL 1.d-15
STOL 1.d-10
ITOL 1.d-10
!NUMERICAL_JACOBIAN
END
END
#=========================== discretization ===================================
GRID
TYPE structured
ORIGIN 0.d0 0.d0 0.d0
NXYZ 1 1 10
DXYZ
1.0d0
1.0d0
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0 \
0.05d0
/
END
PROC 1 1 1
#=========================== fluid properties =================================
FLUID_PROPERTY
PHASE LIQUID
DIFFUSION_COEFFICIENT 1.d-7
END
FLUID_PROPERTY
PHASE gas
DIFFUSION_COEFFICIENT 2.d-4
END
#=========================== material properties ==============================
MATERIAL_PROPERTY soil1
ID 1
POROSITY 0.97d0
!SOIL_COMPRESSIBILITY_FUNCTION DEFAULT ! BRAGFLO compressed porosity has mathematical issue at high pressure
! 1d-7~1d-8 equivalent to ice expansion of volume, upon 'default' or 'BRAGFLO'
! beyond this range may cause tiny-time stepping
SOIL_COMPRESSIBILITY 1.d-07 ! 1d-7~1d-8 is a critical value for freezing expansion in soil;
SOIL_REFERENCE_PRESSURE 201325.d0
ROCK_DENSITY 2650.0d0
SPECIFIC_HEAT 830.0d0
THERMAL_CONDUCTIVITY_DRY 0.12037926674717922d0
THERMAL_CONDUCTIVITY_WET 1.6082691464310437d0
CHARACTERISTIC_CURVES sf01
PERMEABILITY
PERM_X 6.5870260083342112d-013
PERM_Y 6.5870260083342112d-013
PERM_Z 9.5870260083342112d-14
/
/
MATERIAL_PROPERTY soil2
ID 2
POROSITY 0.62d0
!SOIL_COMPRESSIBILITY_FUNCTION DEFAULT ! BRAGFLO compressed porosity has mathematical issue at high pressure
! 1d-7~1d-8 equivalent to ice expansion of volume, upon 'default' or 'BRAGFLO'
! beyond this range may cause tiny-time stepping
SOIL_COMPRESSIBILITY 1.d-07 ! 1d-7~1d-8 is a critical value for freezing expansion in soil;
SOIL_REFERENCE_PRESSURE 201325.d0
ROCK_DENSITY 2650.0d0
SPECIFIC_HEAT 830.0d0
THERMAL_CONDUCTIVITY_DRY 0.12037926674717922d0
THERMAL_CONDUCTIVITY_WET 1.6082691464310437d0
CHARACTERISTIC_CURVES sf01
PERMEABILITY
PERM_X 6.5870260083342112d-013
PERM_Y 6.5870260083342112d-013
PERM_Z 4.5870260083342112d-13
/
/
# == saturation / permeability functions ======================================
CHARACTERISTIC_CURVES sf01
SATURATION_FUNCTION VAN_GENUCHTEN
LIQUID_RESIDUAL_SATURATION 0.d0
ALPHA 1.d-4
M 0.5d0
MAX_CAPILLARY_PRESSURE 1.d6
/
PERMEABILITY_FUNCTION MUALEM
PHASE LIQUID
LIQUID_RESIDUAL_SATURATION 0.d0
M 0.5d0
/
PERMEABILITY_FUNCTION MUALEM_VG_GAS
PHASE GAS
LIQUID_RESIDUAL_SATURATION 0.d0
GAS_RESIDUAL_SATURATION 1.d-5
M 0.5d0
/
END
#=========================== output options ===================================
OUTPUT
SCREEN PERIODIC 10000
PERIODIC TIME 1.d0 d
FORMAT TECPLOT POINT
OBSERVATION_FILE
PERIODIC TIME 1.d0 d
VARIABLES
NO_FLOW_VARIABLES
NO_ENERGY_VARIABLES
LIQUID_SATURATION
/
/
END
#=========================== times ============================================
TIME
FINAL_TIME 100 d
INITIAL_TIMESTEP_SIZE 1.0d0 h
MAXIMUM_TIMESTEP_SIZE 12.d0 h
END
#=========================== regions ==========================================
REGION top
COORDINATES
0.d0 0.d0 0.5d0
1.d0 1.d0 0.35d0
/
FACE TOP
END
REGION surface
COORDINATES
0.d0 0.d0 0.5d0
1.d0 1.d0 0.49d0
/
FACE TOP
END
REGION bottom
COORDINATES
0.d0 0.d0 0.0d0
1.d0 1.d0 0.34d0
/
FACE BOTTOM
END
REGION drain
COORDINATES
0.d0 0.d0 0.0d0
1.d0 1.d0 0.45d0
/
FACE BOTTOM
END
REGION all
COORDINATES
0.d0 0.d0 0.d0
1.d0 1.d0 0.5d0
/
FACE TOP
END
REGION obs_pt1
COORDINATE 3.d-2 3.d-2 0.48
END
REGION obs_pt2
COORDINATE 3.d-2 3.d-2 0.38
END
REGION obs_pt3
COORDINATE 3.d-2 3.d-2 0.28
END
REGION obs_pt4
COORDINATE 3.d-2 3.d-2 0.18
END
REGION obs_pt5
COORDINATE 3.d-2 3.d-2 0.08
END
#=========================== observation points ===============================
OBSERVATION
REGION obs_pt1
END
OBSERVATION
REGION obs_pt2
END
OBSERVATION
REGION obs_pt3
END
OBSERVATION
REGION obs_pt4
END
OBSERVATION
REGION obs_pt5
END
#=========================== transport conditions =============================
FLOW_CONDITION initial
TYPE
GAS_PRESSURE dirichlet
GAS_SATURATION dirichlet
TEMPERATURE dirichlet
/
GAS_PRESSURE 2.d5
GAS_SATURATION 0.25
TEMPERATURE 4.d0
/
FLOW_CONDITION sed_air_interface
TYPE
GAS_PRESSURE dirichlet
GAS_SATURATION dirichlet
TEMPERATURE dirichlet
/
GAS_PRESSURE 2.d5
GAS_SATURATION 0.15
TEMPERATURE 4.d0
/
FLOW_CONDITION drain
TYPE
RATE volumetric_rate
/
RATE LIST
TIME_UNITS d
DATA_UNITS m^3/s
! liquid gas energy
0.0 0.d0 0.d0 0.d0
0.5 0.d0 0.d0 0.d0
1.0 0.d0 0.d0 0.d0
1.5 0.d0 0.d0 0.d0
2.0 0.d0 0.d0 0.d0
2.5 0.d0 0.d0 0.d0
3.0 0.d0 0.d0 0.d0
3.5 -3.62d-08 0.d0 0.d0
/
/
TRANSPORT_CONDITION drain
TYPE dirichlet
CONSTRAINT_LIST
0.d0 drain
/
END
FLOW_CONDITION recharge
TYPE
RATE volumetric_rate
/
RATE LIST
TIME_UNITS d
DATA_UNITS m^3/s
! liquid gas energy
0.0 0.d0 0.d0 0.d0
31. 1.d-4 0.d0 0.d0
32. 0.d0 0.d0 0.d0
/
/
TRANSPORT_CONDITION recharge
TYPE dirichlet
CONSTRAINT_LIST
0.d0 recharge
/
END
TRANSPORT_CONDITION initial
TYPE dirichlet
CONSTRAINT_LIST
0.d0 initial
/
END
TRANSPORT_CONDITION sed_air_interface
TYPE dirichlet
CONSTRAINT_LIST
0.d0 sed_air_interface
/
END
#=========================== condition couplers ===============================
# initial condition
INITIAL_CONDITION
TRANSPORT_CONDITION initial
FLOW_CONDITION initial
REGION all
END
BOUNDARY_CONDITION sed_air_interface
TRANSPORT_CONDITION sed_air_interface
FLOW_CONDITION sed_air_interface
REGION surface
END
SOURCE_SINK recharge
FLOW_CONDITION recharge
TRANSPORT_CONDITION recharge
REGION surface
END
SOURCE_SINK drain
FLOW_CONDITION drain
TRANSPORT_CONDITION drain
REGION drain
END
#=========================== stratigraphy couplers ============================
STRATA
REGION top
MATERIAL soil1
END
STRATA
REGION bottom
MATERIAL soil2
END
END_SUBSURFACE