| Titre | Urbanization impacts on flood risks based on urban growth data and coupled flood models |
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| Auteur | Feng, B; Zhang, Y; Bourke, R |
| Source | Natural Hazards 2021 p. 1-15, https://doi.org/10.1007/s11069-020-04480-0  Accès ouvert |
| Image |  |
| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200599 |
| Éditeur | Springer |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1007/s11069-020-04480-0 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Ontario |
| SNRC | 30M/11; 30M/12; 30M/13; 30M/14 |
| Région | Greater Toronto Area; Rivière Don |
| Lat/Long OENS | -79.6667 -79.0833 43.9167 43.5833 |
| Sujets | inondations; potentiel d'inondation; bassins versants; plaines d'inondation; établissement de modèles; modèles; milieu hydrologique; propriétés hydrologiques; analyses hydrauliques; simulations par
ordinateur; utilisation du terrain; eaux de ruissellement; eaux de surface; rivières; taux de décharge; sols; perméabilité; hydrographes; télédétection; imagerie par satellite; Développement urbain; Couverture du sol; Évaluation des risques; effets
cumulatifs; hydrogéologie; pédologie; géophysique; Nature et environnement; Sciences et technologie; Santé et sécurité |
| Illustrations | cartes de localisation; modèles altimétriques numériques; croquis cartographiques; organigrammes; hydrogrammes; tableaux |
| Programme | Centre canadien de télédétection Centre canadien de télédétection, programmed d'eau |
| Diffusé | 2021 01 29 |
| Résumé | (disponible en anglais seulement)
Urbanization increases regional impervious surface area, which generally reduces hydrologic response time and therefore increases flood risk. The objective of
this work is to investigate the sensitivities of urban flooding to urban land growth through simulation of flood flows under different urbanization conditions and during different flooding stages. A sub-watershed in Toronto, Canada, with urban land
conversion was selected as a test site for this study. In order to investigate the effects of urbanization on changes in urban flood risk, land use maps from six different years (1966, 1971, 1976, 1981, 1986, and 2000) and of six simulated land use
scenarios (0%, 20%, 40%, 60, 80%, and 100% impervious surface area percentages) were input into coupled hydrologic and hydraulic models. The results show that urbanization creates higher surface runoff and river discharge rates and shortened times to
achieve the peak runoff and discharge. Areas influenced by flash flood and floodplain increases due to urbanization are related not only to overall impervious surface area percentage but also to the spatial distribution of impervious surface
coverage. With similar average impervious surface area percentage, land use with spatial variation may aggravate flash flood conditions more intensely compared to spatially uniform land use distribution. |
| GEOSCAN ID | 327992 |
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