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| Titel |
Mass transport of contaminated soil released into surface water by landslides (Göta River, SW Sweden) |
| VerfasserIn |
G. Göransson, M. Larson, D. Bendz, M. Åkesson |
| 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 ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-05), S.1879-1893 |
| Datensatznummer |
250013355
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| Publikation (Nr.) |
 copernicus.org/hess-16-1879-2012.pdf |
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| Zusammenfassung |
| Landslides of contaminated soil into surface water represent an overlooked
exposure pathway that has not been addressed properly in existing risk
analysis for landslide hazard, contaminated land, or river basin management.
A landslide of contaminated soil into surface water implies an instantaneous
exposure of the water to the soil, dramatically changing the prerequisites
for the mobilisation and transport of pollutants. In this study, an
analytical approach is taken to simulate the transport of suspended matter
released in connection with landslides into rivers. Different analytical
solutions to the advection-dispersion equation (ADE) were tested against the
measured data from the shallow rotational, retrogressive landslide in clayey
sediments that took place in 1993 on the Göta River, SW Sweden. The
landslide encompassed three distinct events, namely an initial submerged
slide, followed by a main slide, and a retrogressive slide. These slides
generated three distinct and non-Gaussian peaks in the online turbidity
recordings at the freshwater intake downstream the slide area. To our
knowledge, this registration of the impact on a river of the sediment
release from a landslide is one of few of its kind in the world and
unique for Sweden. Considering the low frequency of such events, the data
from this landslide are highly useful for evaluating how appropriate the ADE
is to describe the effects of landslides into surface water. The results
yielded realistic predictions of the measured variation in suspended
particle matter (SPM) concentration, after proper calibration. For the three
individual slides it was estimated that a total of about 0.6% of the
total landslide mass went into suspension and was transported downstream.
This release corresponds to about 1 to 2% of the annual suspended
sediment transport for that river stretch. The studied landslide partly
involved an industrial area, and by applying the analytical solution to
estimate the transport of metals in the sediments, it was found that
landslides may release a significant amount of pollutants if large
contaminated areas are involved. However, further studies are needed to
develop more detailed descriptions of the transport processes. There is also
a need to increase the knowledge on possible environmental consequences in
the near and far field, in a short- and long-time perspective. In summary,
the release of pollutants should not be neglected in landslide risk assessments. |
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