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| Titel |
Hazard assessment of debris flows for Leung King Estateof Hong Kong by incorporating GIS with numericalsimulations |
| VerfasserIn |
K. T. Chau, K. H. Lo |
| 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 ; 4, no. 1 ; Nr. 4, no. 1 (2004-03-09), S.103-116 |
| Datensatznummer |
250001470
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| Publikation (Nr.) |
 copernicus.org/nhess-4-103-2004.pdf |
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| Zusammenfassung |
| As over seventy percent of the land of Hong Kong is mountainous, rainfall-induced debris
flows are not uncommon in Hong Kong. The objective of this study is to incorporate
numerical simulations of debris flows with GIS to identify potential debris flow hazard areas.
To illustrate this approach, the proposed methodology is applied to Leung King Estate in
Tuen Mun. A Digital Elevation Model (DEM) of the terrain and the potential debris-flow
sources were generated by using GIS to provide the required terrain and flow source data for
the numerical simulations. A theoretical model by Takahashi et al. (1992) improved by
incorporating a new erosion initiation criterion was used for simulating the runout distances
of debris flows. The well-documented 1990 Tsing Shan debris flow, which occurred not too
far from Leung King Estate, was used to calibrate most of the flow parameters needed for
computer simulations. Based on the simulation results, a potential hazard zone was identified
and presented by using GIS. Our proposed hazard map was thus determined by flow
dynamics and a deposition mechanism through computer simulations without using any so- called expert opinions, which are bounded to be subjective and biased. |
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