 |
| Titel |
Characteristics of rainfall triggering of debris flows in the Chenyulan watershed, Taiwan |
| VerfasserIn |
J. C. Chen, C. D. Jan, W. S. Huang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 4 ; Nr. 13, no. 4 (2013-04-19), S.1015-1023 |
| Datensatznummer |
250018412
|
| Publikation (Nr.) |
 copernicus.org/nhess-13-1015-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper reports the variation in rainfall characteristics associated with
debris flows in the Chenyulan watershed, central Taiwan, between 1963 and
2009. The maximum hourly rainfall Im, the maximum 24 h rainfall
Rd, and the rainfall index RI (defined as the product RdIm)
were analysed for each rainfall event that triggered a debris flow within
the watershed. The corresponding number of debris flows initiated by each
rainfall event (N) was also investigated via image analysis and/or field investigation. The
relationship between N and RI was analysed. Higher RI of a rainfall event would trigger a larger number of
debris flows. This paper also discusses the effects of the Chi-Chi
earthquake (CCE) on this relationship and on debris flow initiation. The
results showed that the critical RI for debris flow initiation had significant variations and was significantly
lower in the years immediately following the CCE of 1999, but appeared to
revert to the pre-earthquake condition about five years later. Under the
same extreme rainfall event of RI = 365 cm2 h−1, the value of
N in the CCE-affected period could be six times larger than that in the
non-CCE-affected periods. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|