Environmental Engineering Reference
In-Depth Information
6.8 Calibration Procedures
In this study, due to a lack of available recorded data over the case study area,
calibration analysis was limited to the observed height of water levels found in the
literature and field reports of the 2008 flood. The adjustment was performed using
different friction values in the channel. Table
6.10
shows the comparison between
observed and modeled values for water depth. The results are also plotted as
shown in Fig.
6.19
.
The results for different test runs based on different friction values to analyze
the sensitivity of the model are shown by comparative graphs of observed values
and simulated values of water depth. Calibration of the model was also done based
on this sensitive element of friction value. The values correspond to the horizontal
and vertical friction values in the channel.
Model sensitivity analysis of friction values was performed based on changing
Manning's coefficient values of roughness within the channel. The surface
roughness map for different land use types was generated for overland flow
modules. The results of testing show that the friction value of 0.05 in the channel
represents
the
best
agreement
between
modeled
and
observed
water
height
Table 6.10
Comparison between observed and modeled depth of water (m)
Observed
depth
Modeled
(0.03)
Modeled
(0.06)
Modeled
(0.05)
Modeled
(0.04)
Modeled
(0.07)
Modeled
(0.02)
1.39
0.78
1.13
1.03
0.91
1.23
0.61
1.46
1.02
1.47
1.34
1.19
1.74
0.89
1.49
1.08
1.55
1.42
1.26
1.78
0.91
1.54
1.1
1.58
1.44
1.28
1.84
0.95
1.59
1.14
1.64
1.5
1.34
1.9
0.98
1.67
1.18
1.7
1.55
1.39
2
1.04
1.66
1.23
1.76
1.61
1.44
2
1.04
1.68
1.24
1.77
1.62
1.45
2.02
1.05
1.65
1.25
1.79
1.64
1.46
1.98
1.03
1.67
1.26
1.79
1.64
1.47
2
1.04
1.7
1.36
1.93
1.77
1.58
2.16
1.13
1.85
1.4
1.98
1.82
1.62
2.22
1.17
1.94
1.47
2.08
1.91
1.71
2.33
1.23
2.02
1.53
2.17
2
1.78
2.42
1.28
2.04
1.55
2.19
2.02
1.8
2.45
1.3
2.04
1.55
2.19
2.02
1.8
2.45
1.3
2.07
1.57
2.22
2.05
1.83
2.48
1.32
2.22
1.72
2.41
2.22
1.99
2.69
1.43
2.16
1.65
2.32
2.14
1.91
2.61
1.39
2.24
1.64
2.31
2.13
1.9
2.73
1.44
2.17
1.63
2.3
2.11
1.89
2.62
1.4
2.23
1.63
2.29
2.11
1.88
2.57
1.37
2.16
1.45
2.05
1.88
1.69
2.21
1.16
2.17
0.78
1.13
1.03
0.91
1.79
0.92
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