Abstract
Purpose
Knowledge of sediment sources is a prerequisite for sustainable management practices and may furthermore improve our understanding of water and sediment fluxes. Investigations have shown that a number of characteristic soil properties can be used as “fingerprints” to trace back the sources of river sediments. Spectral properties have recently been successfully used as such characteristics in fingerprinting studies. Despite being less labour-intensive than geochemical analyses, for example, spectroscopy allows measurements of small amounts of sediment material (>60 mg), thus enabling inexpensive analyses even of intra-event variability. The focus of this study is on the examination of spectral properties of fluvial sediment samples to detect changes in source contributions, both between and within individual flood events.
Materials and methods
Sediment samples from the following three different origins were collected in the Isábena catchment (445 km2) in the central Spanish Pyrenees: (1) soil samples from the main potential source areas, (2) stored fine sediment from the channel bed once each season in 2011 and (3) suspended sediment samples during four flood events in autumn 2011 and spring 2012 at the catchment outlet as well as at several subcatchment outlets. All samples were dried and measured for spectral properties in the laboratory using an ASD spectroradiometer. Colour parameters and physically based features (e.g. organic carbon, iron oxide and clay content) were calculated from the spectra. Principal component analyses (PCA) were applied to all three types of samples to determine natural clustering of samples, and a mixing model was applied to determine source contributions.
Results and discussion
We found that fine sediment stored in the river bed seems to be mainly influenced by grain size and seasonal variability, while sampling location—and thus the effect of individual tributaries or subcatchments—seem to be of minor importance. Suspended sediment sources were found to vary between, as well as within, flood events; although badlands were always the major source. Forests and grasslands contributed little (<10 %), and other sources (not further determinable) contributed up to 40 %. The analyses further suggested that sediment sources differ among the subcatchments and that subcatchments comprising relatively large proportions of badlands contributed most to the four flood events analyzed.
Conclusions
Spectral fingerprints provide a rapid and cost-efficient alternative to conventional fingerprint properties. However, a combination of spectral and conventional fingerprint properties could potentially permit discrimination of a larger number of source types.
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Acknowledgments
This research was carried out within the project “Generation, transport and retention of water and suspended sediments in large dryland catchments: Monitoring and integrated modelling of fluxes and connectivity phenomena” funded by the Deutsche Forschungsgemeinschaft (DFG). The 4th and 5th authors were supported by the SCARCE-CONSOLIDER project (ref. CSD2009-00065) funded by the Spanish Ministry of Economy and Competitiveness. The authors would like to thank Arne Brauer, Benjamin Kayatz, Iris Kleine and Charlotte Wilczok from the University of Potsdam for their support of field work and Stefan Lips and Heide Kraudelt for their support of laboratory measurements. The authors also wish to thank the Ebro Water Authorities for the permission to install the measuring equipment at the Capella gauging station and for providing hydrological data.
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Discharge at Capella weir over the study period including sampling dates for resuspension samples (circle) and suspended sediments during storms (thick lines) (PDF 91 kb)
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Brosinsky, A., Foerster, S., Segl, K. et al. Spectral fingerprinting: characterizing suspended sediment sources by the use of VNIR-SWIR spectral information. J Soils Sediments 14, 1965–1981 (2014). https://doi.org/10.1007/s11368-014-0927-z
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DOI: https://doi.org/10.1007/s11368-014-0927-z