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| Titel |
Applications of simulation technique on debris-flow hazard zone delineation: a case study in Hualien County, Taiwan |
| VerfasserIn |
S. M. Hsu, L. B. Chiou, G. F. Lin, C. H. Chao, H. Y. Wen, C. Y. Ku |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 3 ; Nr. 10, no. 3 (2010-03-23), S.535-545 |
| Datensatznummer |
250008009
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| Publikation (Nr.) |
 copernicus.org/nhess-10-535-2010.pdf |
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| Zusammenfassung |
Debris flows pose severe hazards to communities in mountainous
areas, often resulting in the loss of life and property. Helping
debris-flow-prone communities delineate potential hazard zones
provides local authorities with useful information for developing
emergency plans and disaster management policies. In 2003, the Soil
and Water Conservation Bureau of Taiwan proposed an empirical model
to delineate hazard zones for all creeks (1420 in total) with
potential of debris flows and utilized the model to help establish a
hazard prevention system. However, the model does not fully consider
hydrologic and physiographical conditions for a given creek in
simulation. The objective of this study is to propose new approaches
that can improve hazard zone delineation accuracy and simulate
hazard zones in response to different rainfall intensity. In this
study, a two-dimensional commercial model FLO-2D, physically
based and taking into account the momentum and energy conservation
of flow, was used to simulate debris-flow inundated areas.
Sensitivity analysis with the model was conducted to determine the main
influence parameters which affect debris flow simulation. Results indicate
that the roughness coefficient, yield stress and volumetric sediment
concentration dominate the computed results. To improve accuracy of
the model, the study examined the performance of the rainfall-runoff model of
FLO-2D as compared with that of the HSPF (Hydrological Simulation Program
Fortran) model, and then the proper values of the significant parameters were
evaluated through the calibration process. Results reveal that the HSPF model
has a better performance than the FLO-2D model at peak flow and flow
recession period, and the volumetric sediment concentration and yield stress
can be estimated by the channel slope. The validation of the model for
simulating debris-flow hazard zones has been confirmed by a comparison of
field evidence from historical debris-flow disaster data. The model can
successfully replicate the influence zone of the debris-flow disaster event
with an acceptable error and demonstrate a better result than the empirical
model adopted by the Soil and Water Conservation Bureau of Taiwan. |
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