| Title | Urbanization impacts on flood risks based on urban growth data and coupled flood models |
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| Author | Feng, B; Zhang, Y; Bourke, R |
| Source | Natural Hazards 2021 p. 1-15, https://doi.org/10.1007/s11069-020-04480-0  Open Access |
| Image |  |
| Year | 2021 |
| Alt Series | Natural Resources Canada, Contribution Series 20200599 |
| Publisher | Springer |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Ontario |
| NTS | 30M/11; 30M/12; 30M/13; 30M/14 |
| Area | Greater Toronto Area; Don River |
| Lat/Long WENS | -79.6667 -79.0833 43.9167 43.5833 |
| Subjects | hydrogeology; soils science; geophysics; Nature and Environment; Science and Technology; Health and Safety; floods; flood potential; watersheds; flood plains; modelling; models; hydrologic environment;
hydrologic properties; hydraulic analyses; computer simulations; land use; runoff; surface waters; rivers; discharge rates; soils; permeability; hydrographs; remote sensing; satellite imagery; Don Valley Watershed; Hydrologic Engineering
Center-Hydrological Model System (HEC-HMS); Hydrologic Engineering Center- River Analysis System (HEC-RAS); Urban development; Land cover; Risk assessment; cumulative effects |
| Illustrations | location maps; digital elevation models; sketch maps; flow charts; hydrographs; tables |
| Program | Canada Centre for Remote Sensing Canada Centre for Remote Sensing Water Program |
| Released | 2021 01 29 |
| Abstract | 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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