Mechanical And Fluid-dynamic Behaviour
Of Debris And Hyper-concentrated Flows:
Overview And Challenges
Author(s)
D. De Wrachien, S. Mambretti & C. Deangeli
Abstract
Debris and hyper-concentrated flows are among the most destructive of all
water-related disasters. They mainly affect mountain areas in a wide range of
morphoclimatic environments and in recent years have attracted more and more
attention from the scientific and professional communities and concern from
public awareness, due to the increasing frequency with which they occur and the
death toll they claim. In this context, achieving a set of debris and
hyper-concentrated flow constitutive equations is a task that has been given
particular attention by scientists during the second half of the last century.
In relation to these issues, this paper reviews the most updated and effective
geotechnical and fluid-dynamic procedures nowadays available, suitable to
predict the triggering and mobilising processes of these phenomena, and
proposes a mathematical model that is able to assess the depth of the wave and
the velocities of the liquid and solid phases of both non-stratified (mature) and
stratified (immature) flows following flash-floods and dam-break events in one
and two dimensional cases.
Different experimental cases of dam-break situations in a square section
channel were considered for the purpose of comparing results.
These tools will allow, on one hand, to better focus on what to observe in the
field and, on the other hand, to improve both mitigation measures and hazard
mapping procedures.
Keywords: debris flow, rheological behaviour of the mixture, slope failure,
numerical models, laboratory and field tests.
Keywords
debris flow, rheological behaviour of the mixture, slope failure,
numerical models, laboratory and field tests
Related Book
Other papers in this volume
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