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| Titel |
Measurement of spatial and temporal fine sediment dynamics in a small river |
| VerfasserIn |
Y. Schindler Wildhaber, C. Michel, P. Burkhardt-Holm, D. Bänninger, C. Alewell |
| 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. 5 ; Nr. 16, no. 5 (2012-05-23), S.1501-1515 |
| Datensatznummer |
250013302
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| Publikation (Nr.) |
 copernicus.org/hess-16-1501-2012.pdf |
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| Zusammenfassung |
| Empirical measurements on fine sediment dynamics and fine sediment infiltration and
accumulation have been conducted worldwide, but it is difficult to compare
the results because the applied methods differ widely. We compared
common methods to capture temporal and spatial dynamics of suspended
sediment (SS), fine sediment infiltration and accumulation and tested them
for their suitability in a small, canalized river of the Swiss Plateau.
Measurement suitability was assessed by data comparison, relation to hydrological data
and in the context of previously published data. SS concentration and load were assessed by optical
backscatter (OBS) sensors and SS samplers. The former exhibit a better
temporal resolution, but were associated with calibration problems. Due to
the relatively low cost and easy mounting of SS samplers, they can provide a
higher spatial distribution in the river's cross section. The latter resulted in a better
correlation between sediment infiltration and SS load assessed by SS samplers
than SS concentrations measured with OBS sensors. Sediment infiltration baskets and bedload traps
capture the temporal and spatial distribution of fine sediment
infiltration. Data obtained by both methods were positively correlated with
water level and SS. In contrast, accumulation baskets do not assess the
temporal behaviour of fine sediment, but the net accumulation over a certain time
period. Less fine sediment accumulated in upwelling
zones and within areas of higher mean water level due to scouring of fine sediments. Even though SS and sediment infiltration assessed with
the bedload traps increased from up- to downstream, less fine sediment accumulated
downstream. This is probably also attributable to more scouring downstream. |
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