Table 1.
Significance assessment of indexes based on RF model.
| Index Code | Index Name | Index Weight |
|---|---|---|
| I1 | Flood season rainfall (mm) | 0.0923 |
| I2 | Elevation (m) | 0.0826 |
| I3 | Urbanization rate (%) | 0.0473 |
| I4 | Population density (Person/km2) | 0.0608 |
| I5 | Urban impervious area ratio (%) | 0.0746 |
| I6 | GDP per square kilometer of land (¥0.1B/km2) | 0.0648 |
| I7 | Per capita water resources (L) | 0.0272 |
| I8 | Arable land per capita (10,000/km2) | 0.0564 |
| I9 | Water area ratio (%) | 0.0416 |
| I10 | Vegetation coverage (%) | 0.0559 |
| I11 | Density of highway network in built-up area (km/km2) | 0.0492 |
| I12 | Density of drainage network in built-up area (km/km2) | 0.0501 |
| I13 | Direct economic loss from flood disasters (¥0.1B) | 0.046 |
| I14 | Flood area population (10,000) | 0.037 |
| I15 | Municipal flood control investment per unit area (¥10,000) | 0.0849 |
| I16 | Public disaster response capacity | 0.0463 |
| I17 | Emergency rescue capacity of public administration departments | 0.0494 |
| I18 | Reserve and distribution capacity of flood control materials | 0.0337 |