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| Titel |
Contribution of directly connected and isolated impervious areas to urban drainage network hydrographs |
| VerfasserIn |
Y. Seo, N.-J. Choi, A. R. Schmidt |
| 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. 9 ; Nr. 17, no. 9 (2013-09-12), S.3473-3483 |
| Datensatznummer |
250085927
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| Publikation (Nr.) |
 copernicus.org/hess-17-3473-2013.pdf |
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| Zusammenfassung |
| This paper addresses the mass balance error observed in runoff hydrographs
in urban watersheds by introducing assumptions regarding the contribution of
infiltrated rainfall from pervious areas and isolated impervious area (IIA)
to the runoff hydrograph. Rainfall infiltrating into pervious areas has been
assumed not to contribute to the runoff hydrograph until Hortonian excess
rainfall occurs. However, mass balance analysis in an urban watershed
indicates that rainfall infiltrated to pervious areas can contribute
directly to the runoff hydrograph, thereby offering an explanation for the long
hydrograph tail commonly observed in runoff from urban storm sewers. In this
study, a hydrologic analysis based on the width function is introduced, with
two types of width functions obtained from both pervious and impervious
areas, respectively. The width function can be regarded as the direct
interpretation of the network response. These two width functions are
derived to obtain distinct response functions for directly connected
impervious areas (DCIA), IIA, and pervious areas. The results show
significant improvement in the estimation of runoff hydrographs and suggest
the need to consider the flow contribution from pervious areas to the runoff
hydrograph. It also implies that additional contribution from flow paths
through joints and cracks in sewer pipes needs to be taken into account to
improve the estimation of runoff hydrographs in urban catchments. |
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