Articles | Volume 16, issue 7
Nat. Hazards Earth Syst. Sci., 16, 1691–1697, 2016
https://doi.org/10.5194/nhess-16-1691-2016
Nat. Hazards Earth Syst. Sci., 16, 1691–1697, 2016
https://doi.org/10.5194/nhess-16-1691-2016

Research article 22 Jul 2016

Research article | 22 Jul 2016

Debris flow impact estimation on a rigid barrier

Federico Vagnon1 and Andrea Segalini2 Federico Vagnon and Andrea Segalini
  • 1Department of Earth Sciences, University of Turin, 10135 Turin, Italy
  • 2Department of Civil-Environmental Engineering and Architecture, University of Parma, 43124 Parma, Italy

Abstract. The aim of this paper is to analyse debris flow impact against rigid and undrained barrier in order to propose a new formulation for the estimation of acting force after the flow impact to safe design protection structures. For this reason, this work concentrates on the flow impact, by performing a series of small scale tests in a specifically created flume. Flow characteristics (flow height and velocity) and applied loads (dynamic and static) on barrier were measured using four ultrasonic devices, four load cells and a contact surface pressure gauge. The results obtained were compared with main existing models and a new equation is proposed. Furthermore, a brief review of the small scale theory was provided to analyse the scale effects that can affect the results.

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This study has the aim of reviewing the dynamics of debris flow impact against rigid structures and providing a new simple formulation to predict peak thrust. The proposed equation differs from other formulations because it takes into account flow characteristics, material properties, and barrier dimensions. The developed model is sufficiently capable of predicting measured force during the laboratory tests.
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