PSI - Issue 62

Giovanna Pappalardo et al. / Procedia Structural Integrity 62 (2024) 460–467 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

466

7

Fig. 7. Catchment basin.

Table 2. Parameters of the rainfall probability curves. Tr [years] 50 100

200

300

a [mm]

60.02

66.97

73.89

77.93

n

0.19

0.18

0.18

0.18

Table 3. Parameters of the rainfall probability curves. Tr [years] 50 100

200 6.57

300 6.93

Q (m 3 /s)

5.34

5.96

The analysis shows that the flows reaching the bridge are small relative to the bridge clearance, owing to the limited size of the catchment basin. This condition suggests that the hydraulic clearance is directly proportional to the rise of the bottom due to the landslide but that the flow rates, even for long return period, can pass almost until the spans are entirely blocked. Consequently, the hydraulic risk associated with the landslide evolution is still to be considered low.

(a)

(b)

Fig. 8. (a) Rainfall probability curves for several return periods. (b) Freeboard vs rise of riverbed elevation.