TY - JOUR
T1 - Elementary analysis on the bed-sediment entrainment by debris flow and its application using the TopFlowDF model
AU - Han, Zheng
AU - Chen, Guangqi
AU - Li, Yange
AU - Zhang, Hong
AU - He, Yi
N1 - Funding Information:
This study received financial support from Kyushu University Interdisciplinary Programs in Education and Projects in Research Development. It was also supported by JSPS KAKENHI [grant number 22310113] and the Global Environment Research Found of Japan (S-8). These financial aids are gratefully acknowledged.
Publisher Copyright:
© 2014 Taylor & Francis.
PY - 2016/3/3
Y1 - 2016/3/3
N2 - 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.
AB - 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.
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U2 - 10.1080/19475705.2014.966868
DO - 10.1080/19475705.2014.966868
M3 - Article
AN - SCOPUS:84955502960
SN - 1947-5705
VL - 7
SP - 764
EP - 785
JO - Geomatics, Natural Hazards and Risk
JF - Geomatics, Natural Hazards and Risk
IS - 2
ER -