Gullies And Debris Flows Analysis:
A Case Study In Sardinia And
A Rheological Modelling Approach
Author(s)
A. Canu & G. Lorenzini
Abstract
Soil erosion is one of the main causes of desertification in the Mediterranean
basin. Recently, the role of channelled erosion in sediment delivery has been
underlined by several studies. Rheological studies of debris flows, which provide
information on the properties of the mixture, are essential for improving
prediction and designing mitigation for potential hazardous areas. The paper has
two aims: describing a simplified experimental methodology, set up for studying
the relationships between Gully erosion and land use, applied to an experimental
hilly site threatened by desertification in Central Eastern Sardinia (Italy);
showing a debris flow model, based on a dimensional analysis and calibrated
with experimental data, to identify the causes for momentum transport in the
process. The results show a very significant impact of agricultural activities on
Gully intensity and density, while the debris flow model proves to be capable of
satisfactory predictions of actual events.
Keywords: Gullies, debris flows, desertification, land use, momentum transport.
1 Introduction
The soil being eroded by the water is, in the Mediterranean area, one of the most
important land degradation processes. Despite Gully erosion being a significant
sediment source which aggravates off-site effects of water erosion [1, 2],
literature has mainly focused on rill and interrill erosion, as Gully-related in-field
activities are very challenging [3]. It is then fundamental to monitor, experiment
and model how the environment is affected by Gully erosion. Under the latter
Keywords
Gullies, debris flows, desertification, land use, momentum transport.
Related Book
Other papers in this volume
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