Integrated Model Initialization |
Climatic region |
I-A |
I-A |
I-A |
II–A or III–A |
|
Weather station |
User-defined |
User-defined |
User-defined |
User-defined |
|
Year |
1994 |
1994 |
1994 |
1994 |
|
First month |
6 |
6 |
7 |
2 |
|
First day |
20 |
23 |
20 |
14 |
Length of analysis period (days) |
365 |
365 |
365 |
365 |
|
Time increment for output (hrs) |
6 |
6 |
6 |
6 |
|
Time increment for calculation (hrs) |
0.01 |
0.01 |
0.01 |
0.01 |
|
Latitude |
44°3’27.2" |
43°13’20.1" |
44°7’10.4" |
49°46’9.6" |
LTPP databasetable INV_ID |
Climate/Boundary Conditions |
Daily max/min temperatures |
Site specific data from LTPP database
table SMP_ATEMP_RAIN_DAY |
Daily rainfall |
Daily windspeed |
Boston |
Boston |
Boston |
Fargo |
Default weather station data |
Daily percent sunshine |
Boston |
Boston |
Boston |
Fargo |
Default weather station data |
Daily water table depth (m) |
(Range:1.67 to 3.92) |
(Range: 3.80 to 4.11) |
(Range: 0.78 to 1.44) |
(Range: 1.64 to 3.30) |
Site-specific data from LTPP database table SMP_WATERT
AB_DEPTH_M AX |
Thermal Properties |
Time of day when max and min temperatures occur |
Max: 1:55 p.m. Min: 5:12 a.m. |
Max: 2:07 p.m. Min: 5:49 a.m. |
Max: 1:13 p.m.
Min: 6:12 a.m. |
Max: 2:29 p.m.
Min: 8:48 a.m. |
Site averages derived from LTPP database table SMP_ATEMP_
RAIN_DAY |
One side base width (m) |
6.71 |
5.79 |
3.35 |
3.66 |
Computed from data in LTPP database tables INV_GENERA L and
INV_SHOULDER |
Modifier of overburden pressure |
0.5 |
0.5 |
0.5 |
0.5 |
Default |
Emissivity factor |
0.9 |
0.9 |
0.9 |
0.9 |
Default |
Surface short wave absorptivity |
0.85 |
0.85 |
0.85 |
0.85 |
Default |
Maximum convection coefficient |
44.7 |
44.7 |
44.7 |
44.7 |
Default |
Coefficient of variation of unsaturated permeability |
1 |
1 |
1 |
1 |
Default |
Limits of freezing range (°C) |
0/-1 |
0/-1 |
0/-1 |
0/-1 |
Default |
Linear length of cracks/joints one side of pavement (m) |
12 |
133 |
125 |
108 |
Derived from LTPP database table MON_DIS_AC_REV |
Total survey length (m) |
152.4 |
152.4 |
152.4 |
152.4 |
Standard LTPP test section length |
Base % fines |
4 |
4.5 |
3.3 |
10.9 |
Derived from LTPP database tables TST_SS04_UG0 8, TST_SS01_UG0
1_UG02, TST_SS02_UG0 3, and TST_UG04_SS0 3 |
Base % gravel |
73.7 |
62.9 |
89.9 |
52 |
|
Base % sand |
22.3 |
32.6 |
6.8 |
37.1 |
|
Base fines type |
Silt |
Silt |
Silt |
Silt |
|
One side base width (m) |
6.71 |
5.79 |
3.35 |
3.66 |
Computed from data in LTPP database tables INV_GENERA L and
INV_SHOULDER |
Slope ratio/base tangent |
1.5 |
1.5 |
1.5 |
1.5 |
Default |
Internal boundary condition |
Suction |
Suction |
Suction |
Suction |
Based on data in LTPP database table SMP_WATERT
AB_DEPTH_MAN |
Evaluation period |
10 |
10 |
10 |
10 |
Default |
Constant K |
0.3 |
0.3 |
0.3 |
0.3 |
Default |
Power of recurrence interval |
0.25 |
0.25 |
0.25 |
0.25 |
Default |
Power of rainfall duration |
0.75 |
0.75 |
0.75 |
0.75 |
Default |
Shape constant |
1.65 |
1.65 |
1.65 |
1.65 |
Default |
Layer 1 material |
AC |
AC |
AC |
AC |
LTPP database table TST_L05A |
Unbound layer materials, in order from top (base) to bottom
(subgrade) |
A-1-a
A-2-4 |
A-1-a
A-1-b
A-2-4 |
A-1-a
A-1-a |
A-1-a
A-2-6
A-2-4 |
LTPP database table TST_SS04_UG08 or derived from TST_SS01_UG0
1_UG_2 and TST_UG04_SS0 3 |
Layer thickness (in order, top to bottom) |
0.163
0.49
2.24 |
0.216
0.49
0.37
1.43 |
0.224
0.70
1.58 |
0.11
.15
0.31
1.99 |
LTPP database table TST_L05A |
Number of elements per layer (in order, top to bottom) |
1
10
58 |
1
20
27
28 |
1
24
64 |
1
5
16
40 |
Selected to optimize proximity to TDR probe depths |
Asphalt surface thickness (cm) |
16.3 |
21.6 |
22.4 |
11.3 |
LTPP database table TST_L05A |
Number of elements |
1 |
1 |
1 |
1 |
|
Layer porosity |
0.29
0.37 |
0.22
0.24
0.43 |
0.29
0.46 |
0.22
0.21
0.46 |
Inferred from maximum observed volumetric moisture for layer
(LTPP database table SMP_TDR_AU TO_MOISTUR E |
Dry unit weight (gm/cm3) |
2.27
1.96 |
2.10
2.15
1.86 |
2.09
1.76 |
2.08
1.71
2.13 |
Section 501002:LTPP database table TST_ISD_MOI ST; sections
331001 and 831801: SMP installation reports |
Saturated permeability (cm/hr) |
60
15.24 |
0.2
0.2
0.5 |
0.2
0.2 |
0.2
0.2
0.5 |
Default |
Dry thermal conductivity |
4.47
4.023 |
0.3
0.3
0.27 |
0.3
0.3 |
0.3
0.3
0.27 |
Default |
Dry heat capacity |
0.17
0.17 |
0.17
0.17
0.17 |
0.17
0.17 |
0.17
0.17
0.17 |
Default |
Volume capacity |
0.10
0.3 |
0.1
0.1
0.3 |
0.10
0.10 |
0.1
0.1
0.3 |
Default |
AWL (moisture) |
0.6 |
0.6
0.6
0.4 |
0.6
0.6 |
0.6
0.6
0.4 |
Default |
XWL |
0.3 |
0.3
0.3
0.9 |
0.3
0.3 |
0.3
0.3
0.9 |
Default |
AKL (permeability) |
0.01 |
0.01
0.01
1e-4 |
0.01
0.01 |
0.01
0.01
1e-4 |
Default |
XKL |
2 |
2
2
3.5 |
2
2 |
2
2
3.5 |
Default |
Initial temperature profile |
Derived from LTPP database table
SMP_MRCTEMP_AUTO_DAY_STAT (interpolation required) |
Initial water content profile |
LTPP database table SMP_TDR_AUTO_MOISTURE; Number
of elements in each layer selected such that a node is close to
each TDR probe depth |
Initial temperature profile |
Derived from LTPP database table
SMP_MRCTEMP_AUTO_DAY_STAT (interpolation required) |
Initial water content profile |
LTPP database table SMP_TDR_AUTO_MOISTURE; number
of elements in each layer selected such that a node is close to
each TDR probe depth |