Sediment Yield From Mountain Slopes:
A GIS Based Automation Of The Classic
Gavrilovic Method
Author(s)
D. Brambilla, L. Longoni, F. Mazza & M. Papini
Abstract
Sediment yield and slope erosion represent nowadays an open problem for
Alpine river basins management. In the last decades a variety of methods to
estimate erosion rate and yield volumes have been studied and presented to the
scientific community; however these methods are often empirical and only
provide rough results. On the other hand the use of physical based methods
demands an enormous quantity of data that are difficult and costly to collect.
Moreover these data are affected by an intrinsic error due to the impossibility of
taking accurate parameter measurements. This paper focuses on the Gavrilovic
method that is considered a standard for erosion evaluation in Alpine regions;
this theory has proved to be effective and quite simple to be applied, but has a
major drawback in the subjectivity of parameter determination. Since 1973,
when this method was initially published, many things have changed and
computers have revolutionized the scientific world. The authors are convinced
that the use of a GIS support can automate the Gavrilovic method. GIS uses
advanced calculation methods based on high resolution geographic data; these
datasets allow one to eliminate or at least reduce the role of the operator in the
calculation processes. Moreover the whole basin can be automatically split into
little sub basins with similar features. This operation leads to an application field
more similar to the original testing site. The final objective is to present an
automated process that can produce a reliable prediction of sediment yield from
little and medium basins starting from DTM and use of soil maps, taking into
account also the rainfall distribution on the studied area. The new method is then
applied to a test site to demonstrate the improvements in time and efficiency this
innovation can lead to.
Keywords: Gavrilovic, sediment yield, soil loss, Alpine basin, GIS.
Keywords
Gavrilovic, sediment yield, soil loss, Alpine basin, GIS
Related Book
Other papers in this volume
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