laboratory tests for the optimization of mesh size for flexible debris-flow barriers
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ID: 155174
2015
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Abstract
Flexible barriers can be used within channelized riverbeds as an effective and efficient alternative
to protect from debris flows.
Their retention capability
strongly depends on the size of the
mesh openings and the gap between the lower barrier edge and the channel's floor.
The question is now whether there is a relation between the grain size distribution of
the debris material and the openings of a flexible barrier.
Small-scale laboratory tests were performed to study these loading aspects of flexible debris-flow
barriers for the Milibach river (Canton Berne, Switzerland).
In situ debris material has been used to
quantify the influence of different mesh sizes and the gap between the lower
barrier edge and the riverbed compared to the d90 grain size and the flow height, where d90 is the maximum
diameter of 90 % of the grains.
It was possible to study the filling process and the retaining behaviour of
the barriers as a function of the mesh size.
A reasonable retention was reached with the net having a mesh size and a basal
gap smaller than or equal to d90. These relations could be transferred to the field.
A dimensional analysis reveals possible dimensionless numbers that can be used to
scale the laboratory results.
The findings are supported by the results of similar laboratory tests
using debris material from different locations and by the available field measurements.
| Reference Key |
wendeler2015naturallaboratory
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|---|---|
| Authors | ;C. Wendeler;A. Volkwein |
| Journal | anziam journal |
| Year | 2015 |
| DOI |
10.5194/nhess-15-2597-2015
|
| URL | |
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