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| Titel |
Coupling urban event-based and catchment continuous modelling for combined sewer overflow river impact assessment |
| VerfasserIn |
I. Andrés-Doménech, J. C. Múnera, F. Francés, J. B. Marco |
| 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 ; 14, no. 10 ; Nr. 14, no. 10 (2010-10-26), S.2057-2072 |
| Datensatznummer |
250012454
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| Publikation (Nr.) |
 copernicus.org/hess-14-2057-2010.pdf |
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| Zusammenfassung |
| Since Water Framework Directive (WFD) was passed in year 2000, the
conservation of water bodies in the EU must be understood in a completely
different way. Regarding to combined sewer overflows (CSOs) from urban
drainage networks, the WFD implies that we cannot accept CSOs because of
their intrinsic features, but they must be assessed for their impact on the
receiving water bodies in agreement with specific environmental aims.
Consequently, both, urban system and the receiving water body must be
jointly analysed to evaluate the environmental impact generated on the
latter. In this context, a coupled scheme is presented in this paper to
assess the CSOs impact on a river system in Torrelavega (Spain). First, a
urban model is developed to statistically characterise the CSOs frequency,
volume and duration. The main feature of this first model is the fact of
being event-based: the system is modelled with some built synthetic storms
which cover adequately the probability range of the main rainfall
descriptors, i.e., rainfall event volume and peak intensity. Thus, CSOs are
characterised in terms of their occurrence probability. Secondly, a
continuous and distributed basin model is built to assess river response at
different points in the river network. This model was calibrated initially
on a daily scale and downscaled later to hourly scale. The main objective of
this second element of the scheme is to provide the most likely state of the
receiving river when a CSO occurs. By combining results of both models, CSO
and river flows are homogeneously characterised from a statistical point of
view. Finally, results from both models were coupled to estimate the final
concentration of some analysed pollutants (biochemical oxygen demand, BOD,
and total ammonium, NH4+), within the river just after the spills. |
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