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| Titel |
Modelling suspended-sediment propagation and related heavy metal contamination in floodplains: a parameter sensitivity analysis |
| VerfasserIn |
R. Hostache, C. Hissler, P. Matgen, C. Guignard, P. Bates |
| 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 ; 18, no. 9 ; Nr. 18, no. 9 (2014-09-10), S.3539-3551 |
| Datensatznummer |
250120465
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| Publikation (Nr.) |
 copernicus.org/hess-18-3539-2014.pdf |
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| Zusammenfassung |
| Fine sediments represent an important vector of pollutant diffusion in
rivers. When deposited in floodplains and riverbeds, they can be responsible
for soil pollution. In this context, this paper proposes a modelling exercise
aimed at predicting transport and diffusion of fine sediments and dissolved
pollutants. The model is based upon the Telemac hydro-informatic system
(dynamical coupling Telemac-2D-Sysiphe). As empirical and semiempirical
parameters need to be calibrated for such a modelling exercise, a sensitivity
analysis is proposed. An innovative point in this study is the assessment of
the usefulness of dissolved trace metal contamination information for model
calibration. Moreover, for supporting the modelling exercise, an extensive
database was set up during two flood events. It includes water surface
elevation records, discharge measurements and geochemistry data such as time
series of dissolved/particulate contaminants and suspended-sediment
concentrations. The most sensitive parameters were found to be the hydraulic
friction coefficients and the sediment particle settling velocity in water.
It was also found that model calibration did not benefit from dissolved trace
metal contamination information. Using the two monitored hydrological events
as calibration and validation, it was found that the model is able to
satisfyingly predict suspended sediment and dissolve pollutant transport in
the river channel. In addition, a qualitative comparison between simulated
sediment deposition in the floodplain and a soil contamination map shows that
the preferential zones for deposition identified by the model are realistic. |
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