Evaluation Of Sediment Yield From Valley
Slopes: A Case Study
Author(s)
F. Ballio, D. Brambilla, E. Giorgetti, L. Longoni,
M. Papini & A. Radice
Abstract
Hydro-geological hazards in alpine areas is a really common problem. Many
calamitous phenomena (such as debris flows, landslides, and others) are related
to the sediment yield from the slopes of the valleys. Sediment yields are far from
being fully understood and predictable, due to a lack of knowledge of the
physical mechanisms underlying these processes and to the variability of the
peculiar geomorphologic characteristics of river basins. Key unknowns are the
medium- and long-term average sediment production, the recharge time of the
sediment sources (and consequently the frequency of the yields), the triggering
factors and the thresholds for activation. The manuscript documents the results
of the estimation of sediment production for the basin of the Tartano valley in
northern Italy. The basin is characterized by a significant presence of weak rocks
(cataclastic, mylonitic), that makes considerable amounts of loose sediments
available. In this work, semi-quantitative models were applied to evaluate the
basin-scale, yearly sediment yield. Estimates sediment volumes were compared
to records of sediment volumes extracted from an artificial reservoir located at
the downstream section of the catchments. In addition, the spatial distribution of
the sediment instability level was obtained, highlighting a significant
heterogeneity of the river basin. Therefore, the relevance of the basin-scale
modelling of sediment yields for off-site and on-site processes was discussed.
The dependency of the sediment yield regime on the spatial and temporal scale
supporting the evaluations was analyzed and discussed.
Keywords: river basin sediment yield scale-based evaluation, soil erosion.
Keywords
river basin sediment yield scale-based evaluation, soil erosion
Related Book
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