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Effects of earthquake and cyclone sequencing on landsliding and fluvial sediment transfer in a mountain catchment

Auteur(s) et Affiliation(s)

LIN, G.-W.
Dept. of Geosciences, National Taiwan Univ., Taipei, Taiwan, Province de Chine
CHEN, H.
Dept. of Geosciences, National Taiwan Univ., Taipei, Taiwan, Province de Chine
HOVIUS, N.
Dept. of Earth Sciences, Univ., Cambridge, Royaume-Uni
HORNG, M.-J.
Water Resource Agency, Taiwan, Province de Chine
DADSON, S.
Centre for Ecology and Hydrology, Wallingford, Royaume-Uni
MEUNIER, P.
Dept. of Earth Sciences, Univ., Cambridge, Royaume-Uni


Description :
Landslides caused by 3 tropical cyclones and a very large earthquake have been mapped in the Chenyoulan catchment in the Taiwan Central Range, where water and sediment discharges and rock strengths are well known. Prior to the Chi-Chi earthquake, the erosion budget was dominated by one exceptionallly large flood, with anomalously high sediment concentrations, caused by typhoon Herb in 1996. Sediment concentrations were much higher than normal in intermediate size floods during the first 5 years after the earthquake, giving high sediment yields. In 2005, sediment concentrations had decreased to values prevalent before 1999. Since the earthquake, hillslope sediment sources have become increasingly disconnected from the channel system, with 90 per cent of landslides not reaching into channels. Downslope advection of landslide debris associated with the Chi-Chi earthquake is driven by the impact of tropical cyclones, but occurs on a time-scale longer than this study.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2008, vol. 33, n°. 9, p. 1354-1373, nombre de pages : 20, Références bibliographiques : 1 p.

Date :
2008

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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