Table 3 Landslide dam stability assessment indices assessed against the recorded behaviour of the Peace River regional landslide dams
From: Longevity of dams from landslides with sub-channel rupture surfaces, Peace River region, Canada
Indices | Formula | Published Thresholds | Reference and Region Applied | ||
|---|---|---|---|---|---|
Unstable | Uncertain | Stable | |||
Blockage | BI = log(VD/AC) | < 4 | 4–5 | > 5 | |
Impoundment | II = log(VD/VL) | < 0 | > 0 | Casagli and Ermini 1999 (Italy) | |
< 1 | > 1 | Korup 2004 (New Zealand) | |||
Dimensionless Blockage | DBI = log(ACHD/VD) | > 3.08 | 2.75–3.08 | < 2.75 | Ermini and Casagli 2003 (world-wide) |
> 5 | 3–5 | < 3 | Korup 2004 (New Zealand) | ||
> 3.98 | 2.43–3.98 | < 2.43 | Tacconi Stefanelli et al. 2016 (Italy) | ||
Backstow | IS = log(HD3/VL) | < −3 | −3 - 0 | > 0 | Korup 2004 (New Zealand) |
Relief | IR = log(HD/HR) | < −1 | > −1 | Korup 2004 (New Zealand) | |
Hydromorphologic | HDSI = log(VD/ACS) | < 5.74 | 5.74–7.44 | > 7.44 | Tacconi Stefanelli et al. 2016 (Italy) |
< 5.26 | 5.26–8.07 | > 8.07 | Tacconi Stefanelli et al. 2017 (Peru) | ||