Elementary analysis on the bed-sediment entrainment by debris flow and its application using the TopFlowDF model

Zheng Han, Guangqi Chen, Yange Li, Hong Zhang, Yi He

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Geographic Information System (GIS)-based TopFlowDF model is an effective simulation tool to analyse the debris-flow propagation on the fan. It has been validated in the previous research works and shows a satisfactory accuracy. We review the framework of the model in this paper and discuss that the simulation results are rather sensitive to the input conditions (e.g. the user-defined start point and debris-flow volume). In fact, previous studies have elucidated that sediment entrainment by debris flow conspicuously influences these input conditions. In this paper, we develop an elementary static approach with a three-layer model to estimate the entrainment and determine the amplification of total mass volume and peak discharge. Subsequently a new concept of “critical line” is proposed to detect the erodible reaches in the channel. Two cases in Japan and Norway are selected to illustrate the approach; analytical results show a good agreement with the in situ survey. The presented approach can provide a better solution to the input conditions as required by TopFlowDF model.

Original languageEnglish
Pages (from-to)764-785
Number of pages22
JournalGeomatics, Natural Hazards and Risk
Volume7
Issue number2
DOIs
Publication statusPublished - Mar 3 2016

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All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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