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Table 5

Comparison of the backwater in front of the bridge in different piers

Working conditionsDetection pointsThe rectangular piers
The round piers
The oval piers
Bridge section elevation after bridge construction /mBridge section elevation before bridge construction /mBackwater value /mBridge section elevation after bridge construction /mBridge section elevation before bridge construction /mBackwater value /mBridge section elevation after bridge construction /mBridge section elevation before bridge construction /mBackwater value /m
The 10-year cycle 27.22 26.91 0.31 27.08 26.91 0.17 27.06 26.91 0.15 
27.19 26.89 0.30 27.07 26.89 0.18 27.03 26.89 0.14 
27.24 26.85 0.39 27.16 26.85 0.31 27.11 26.85 0.26 
27.15 26.89 0.26 27.05 26.89 0.16 27.02 26.89 0.13 
27.22 26.82 0.40 27.13 26.82 0.31 27.09 26.82 0.27 
27.14 26.86 0.28 27.05 26.86 0.19 27.03 26.86 0.17 
27.16 26.88 0.28 27.04 26.88 0.16 27.02 26.88 0.14 
Annual average 18.69 18.58 0.11 18.66 18.58 0.08 18.61 18.58 0.03 
18.68 18.55 0.13 18.64 18.55 0.09 18.62 18.55 0.07 
18.71 18.54 0.17 18.68 18.54 0.14 18.65 18.54 0.11 
18.68 18.57 0.11 18.63 18.57 0.06 18.63 18.57 0.06 
18.70 18.59 0.11 18.67 18.59 0.08 18.64 18.59 0.05 
18.69 18.60 0.09 18.68 18.60 0.08 18.62 18.60 0.02 
18.73 18.59 0.14 18.71 18.59 0.12 18.60 18.59 0.01 
Lowest water level 16.883 16.86 0.018 16.871 16.86 0.006 16.862 16.86 0.002 
16.861 16.841 0.017 16.853 16.841 0.009 16.843 16.841 0.002 
16.871 16.833 0.027 16.858 16.833 0.014 16.847 16.833 0.014 
16.872 16.842 0.025 16.856 16.842 0.009 16.845 16.842 0.003 
16.875 16.826 0.049 16.857 16.826 0.031 16.848 16.826 0.022 
16.873 16.853 0.015 16.867 16.853 0.009 16.856 16.853 0.003 
16.876 16.856 0.010 16.872 16.856 0.006 16.859 16.856 0.003 
Working conditionsDetection pointsThe rectangular piers
The round piers
The oval piers
Bridge section elevation after bridge construction /mBridge section elevation before bridge construction /mBackwater value /mBridge section elevation after bridge construction /mBridge section elevation before bridge construction /mBackwater value /mBridge section elevation after bridge construction /mBridge section elevation before bridge construction /mBackwater value /m
The 10-year cycle 27.22 26.91 0.31 27.08 26.91 0.17 27.06 26.91 0.15 
27.19 26.89 0.30 27.07 26.89 0.18 27.03 26.89 0.14 
27.24 26.85 0.39 27.16 26.85 0.31 27.11 26.85 0.26 
27.15 26.89 0.26 27.05 26.89 0.16 27.02 26.89 0.13 
27.22 26.82 0.40 27.13 26.82 0.31 27.09 26.82 0.27 
27.14 26.86 0.28 27.05 26.86 0.19 27.03 26.86 0.17 
27.16 26.88 0.28 27.04 26.88 0.16 27.02 26.88 0.14 
Annual average 18.69 18.58 0.11 18.66 18.58 0.08 18.61 18.58 0.03 
18.68 18.55 0.13 18.64 18.55 0.09 18.62 18.55 0.07 
18.71 18.54 0.17 18.68 18.54 0.14 18.65 18.54 0.11 
18.68 18.57 0.11 18.63 18.57 0.06 18.63 18.57 0.06 
18.70 18.59 0.11 18.67 18.59 0.08 18.64 18.59 0.05 
18.69 18.60 0.09 18.68 18.60 0.08 18.62 18.60 0.02 
18.73 18.59 0.14 18.71 18.59 0.12 18.60 18.59 0.01 
Lowest water level 16.883 16.86 0.018 16.871 16.86 0.006 16.862 16.86 0.002 
16.861 16.841 0.017 16.853 16.841 0.009 16.843 16.841 0.002 
16.871 16.833 0.027 16.858 16.833 0.014 16.847 16.833 0.014 
16.872 16.842 0.025 16.856 16.842 0.009 16.845 16.842 0.003 
16.875 16.826 0.049 16.857 16.826 0.031 16.848 16.826 0.022 
16.873 16.853 0.015 16.867 16.853 0.009 16.856 16.853 0.003 
16.876 16.856 0.010 16.872 16.856 0.006 16.859 16.856 0.003 
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