Abstract
Diverse sources of information, which describes landslide movement, hillslope-channel connectivity and sedimentation rates, are analyzed to detect trends that took place during the last 12,000 years. We estimate the landslide-related sediment production rates by combining measured landslide velocities and geometries and historical landslide frequency. Coarse sediment deposition rates are measured throughout the Holocene by means of dating and stratigraphy of the alluvial fan and terraced deposits. The comparison between present-day hillslope sediment production and Holocene averaged sediment deposition rates confirms that landsliding is the main agent conveying sediments to higher order trunk streams. The connectivity between hillslopes and the stream network is well developed and no significant sediment sinks influence the sediment transport process. However fluctuations of sediment delivery rates at the outlet of the catchment took place during Holocene and are likely associated to periods of increased hillslope sediment production and channel discharge caused by climatic forcing.
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Acknowledgments
This work has been done in the framework of the Sedymont Project (TOPO-EUROPE) and we would like to thank all the participants who shared our opinion and promoted fruitful discussions.
We would like to thank Emilia-Romagna Region for kindly supplying the following data: landslide inventory map and historical archive, inclinometer readings, borehole logs and dating results on the alluvial fan.
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Simoni, A., Ponza, A., Picotti, V., Berti, M. (2013). Landslide-Related Sediment Yield Rate in a Large Apenninic Catchment. In: Margottini, C., Canuti, P., Sassa, K. (eds) Landslide Science and Practice. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31337-0_39
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DOI: https://doi.org/10.1007/978-3-642-31337-0_39
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