Table 1.
Landside conditioning factors and their classes for landslide modeling in Bijar City.
| No. | Landslide Causal Factors | Classes | |
|---|---|---|---|
| Topographic factors | 1 | Slope (o) | (1) 0–5; (2) 5–10; (3) 10–15; (4) 15–20; (5) 20–25; (6) 25–30; (7) 30–45; (8) >45 |
| 2 | Aspect | (1) Flat; (2) North; (3) Northeast; (4) East; (5) Southeast; (6) South; (7) Southwest; (8) West; (9) Northwest | |
| 3 | Elevation (m) | (1) 1573–1700; (2) 1700–1800; (3) 1800–1900; (4) 1900–2000; (5) 2000–2100; (6) 2100–2200; (7) 2200–2300; (8) 2300–2400; (9) >2400 | |
| 4 | Curvature (m−1) | (1) [(−12.5)–(−1.4)]; (2) [(−1.4)–(−0.4)]; (3) [(−0.4)–(−0.2)]; (4) [(−0.2)–0.9]; (5) [0.9–2.5]; (6) [2.5–15.6] | |
| 5 | Plan curvature (m−1) | (1) [(−6.7)–(−0.8)]; (2) [(−0.8)–(−0.2)]; (3) [(−0.2)–0]; (4) [0–0.4]; (5) [0.4–1.1]; (6) [1.1–10.4] | |
| 6 | Profile curvature (m−1) | (1) [(−10.7)–(−1.7)]; (2) [(−1.7)–(−0.7)]; (3) [(−0.7)–(−0.2)]; (4) [(−0.2)–0.2]; (5) [0.2–0.9]; (6) [0.9–7.5] | |
| 7 | STI | (1) 0–7; (2) 7–14; (3) 14–21; (4) 21–28; (5) 28–35; (6) 35–42 | |
| Hydrological factors | 8 | Rainfall (mm) | (1) 263–270; (2) 270–300; (3) 300–330; (4) 330–360; (5) 360–390; (6) 390–420; (7) 420–450 |
| 9 | Annual solar radiation (h) | (1) 3.015–6.563; (2) 5.563–6.747; (3) 6.747–6.849; (4) 6.849–6.930; (5) 6.930–7.073; (6) 7.073–7.236; (7) 7.236–8.215 | |
| 10 | SPI | (1) 0–998; (2) 998–6986; (3) 6986–19,961; (4) 19,961–45,911; (5) 45,911–101,803; (6) 101,803–255,505 | |
| 11 | TWI | (1) 1–3; (2) 3–4; (3) 4–6; (4) 6–8; (5) 8–9; (6) 9–11 | |
| 12 | Distance to Rivers (m) | (1) 0–50; (2) 50–100; (3) 100–150; (4) 150–200; (5) >200 | |
| 13 | River density (km/km2) | (1) 0–1.9; (2) 1.9–3.2; (3) 3.2–4.2; (4) 4.2–5.2; (5) 5.2–6.3; (6) 6.3–7.8; (7) 7.8–13.2 | |
| Lithological factors | 14 | Lithology | (1) Quaternary (2) Tertiary (3) Cretaceous |
| 15 | Distance to Faults (m) | (1) 0–200; (2) 200–400; (3) 400–600; (4) 600–800; (5) 800–1000; (6) >1000 | |
| 16 | Fault density (km/km2) | (1) 0–0.3; (2) 0.3–0.8; (3) 0.8–1.2; (4) 1.2–1.7; (5) 1.7–2.1; (6) 2.1–2.5; (7) 2.5–3.2 | |
| Land Cover Factors | 17 | Land use | (1) Residential area (2) Arable land (dry faring and cultivated lands); (3) Wood land; (4) Grassland; (5) Barren land |
| 18 | NDVI | (1) [(−0.23)–(−0.061)]; (2) [(−0.061)–(−0.0081)]; (3) [(−0.0081)–(0.060)]; (4) [(0.060)–0.14]; (5) [0.14–0.24]; (6) [0.24–0.41]; (7) [0.41–0.73] | |
| Anthropogenic factors | 19 | Distance to Roads (m) | (1) 0–50; (2) 50–100; (3) 100–150; (4) 150–200; (5) >200 |
| 20 | Road density (km/km2) | (1) 0–0.0013; (2) 0.0013–0.0027; (3) 0.0027–0.0041; (4) 0.0041–0.0055; (5) 0.0055–0.0069; (6) 0.0069–0.0083; (7) 0.0083–0.0097 |