Decadal-scale decay of landslide-derived fluvial suspended sediment after Typhoon Morakot

Abstract a ̃ was higher than that before Morakot by a factor of 5.1 ± 1.1 (mean ± b b 0.25 ± 0.05. Across the compilation of gauging stations, post-Morakot changes in discharge-normalized sediment concentration (a ̃) were positively correlated with landslide intensity for 7 years after Morakot, while post-Morakot changes in the exponent of the discharge–concentration relationship (b a ̃ and b a ̃ declined after the initial post-Morakot peak, consistent with a gradual return to pre-Morakot suspended sediment transport conditions. Exponential regressions to these a ̃ values reveal a median characteristic decay time of 8.8 years (interquartile range: 5.7–14.8 years). Values of a ̃ increased more and declined faster in basins with more intense landsliding, with a mean characteristic decay time of 6 years in the basins hit hardest by landsliding. Furthermore, changes in a ̃ and b a ̃ nor b >  10-fold in some basins in the 1–2 years after Morakot. Together, these results indicate that the influence of Morakot-induced landsliding on rating curves was large shortly after Morakot but diminished in less than a decade in most of the study rivers and will be imperceptible in another few decades in all of the study rivers. To the extent that these results are applicable to other landscapes, this suggests that periods of elevated sediment transport efficiency after landsliding should persist for years to decades, even if the landslide deposits persist for centuries to millennia.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Decadal-scale decay of landslide-derived fluvial suspended sediment after Typhoon Morakot ; volume:12 ; number:4 ; year:2024 ; pages:863-881 ; extent:19 ; Earth surface dynamics ; 12, Heft 4 (2024), 863-881 (gesamt 19)

Beteiligte, Orts- und Zeitangaben

• Urheber: Ruetenik, Gregory A. ; Ferrier, Ken L. ; Marc, Odin

Weitere Informationen

• DOI: 10.5194/esurf-12-863-2024
• URN: urn:nbn:de:101:1-2408061217295.931072055577
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 14.08.2025, 11:03 MESZ