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| Titel |
Assessing the hydrologic restoration of an urbanized area via an integrated distributed hydrological model |
| VerfasserIn |
D. H. Trinh, T. F. M. Chui |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 12 ; Nr. 17, no. 12 (2013-12-04), S.4789-4801 |
| Datensatznummer |
250086013
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| Publikation (Nr.) |
 copernicus.org/hess-17-4789-2013.pdf |
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| Zusammenfassung |
| Green structures (e.g. green roof and bio-retention systems) are adopted to
mitigate the hydrological impacts of urbanization. However, our current
understanding of urbanization impacts are often process-specific (e.g.
peak flow or storm recession), and our characterizations of green structures
are often on a local scale. This study uses an integrated distributed
hydrological model, Mike SHE, to evaluate the urbanization impacts on both
overall water balance and water regime, and also the effectiveness of green
structures at a catchment level. Three simulations are carried out for a
highly urbanized catchment in the tropics, representing pre-urbanized,
urbanized and restored conditions. Urbanization transforms vegetated areas
into impervious surfaces, resulting in 20 and 66% reductions in
infiltration and base flow respectively, and 60 to 100% increase in peak
outlet discharge. Green roofs delay the peak outlet discharge by 2 h and
reduce the magnitude by 50%. Bio-retention systems mitigate the peak
discharge by 50% and also enhance infiltration by 30%. The combination
of green roofs and bio-retention systems even reduces the peak discharge to
the pre-urbanized level. The simulation results obtained are independent of
field data, enabling a generic model for understanding hydrological changes
during the different phases of urbanization. This will benefit catchment-level
planning of green structures in other urban areas. |
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