Disproportionate and chronic sediment delivery from a fluvially controlled, deep-seated landslide in Aotearoa New Zealand

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dc.citation.issue8
dc.citation.volume47
dc.contributor.authorMcColl ST
dc.contributor.authorHoldsworth CN
dc.contributor.authorFuller IC
dc.contributor.authorTodd M
dc.contributor.authorWilliams F
dc.date.accessioned2024-03-13T18:54:16Z
dc.date.accessioned2024-07-25T06:40:01Z
dc.date.available2022-03-09
dc.date.available2024-03-13T18:54:16Z
dc.date.available2024-07-25T06:40:01Z
dc.date.issued2022-06-30
dc.description.abstractPast research has highlighted the importance of sediment delivery from multiple-occurrence regional landslide events triggered by storms or earthquakes. Herein, we examine delivery from a more persistent source of sediment, that of a large, slow-moving landslide in the soft-rock hill country of Aotearoa New Zealand. We map and monitor the 80-ha Rangitikei Landslide from 2015 to 2019 using time-lapse photography, ground surveys, photogrammetry, and piezometers. We show that the landslide can be divided into several zones with distinctive movement patterns, but all zones respond to river erosion. The fastest zone moves more than 10 m per year in a flow-like fashion, while other zones move 0.01 m per year via slow sliding. Movement occurs all year round, but is two to three times faster in winter and spring. While rainfall and associated groundwater change are commonly attributed to landslide movement patterns, our data show that river flow correlates closely with the weekly to seasonal variability in movement of the landslide toe. This suggests that fluvial erosion can play an important role in the movement dynamics of highly coupled landslides. We estimate an annual sediment yield to the Rangitikei River of at least 40 000 tonnes, in this first quantification of sediment delivery from an active soft-rock landslide in Aotearoa. This volume implies 7% of the total catchment suspended sediment yield is derived from 0.03% of the contributing catchment area, demonstrating the disproportionate effect of this (and likely other) deep-seated landslide(s) as a source of sediment in the Rangitikei catchment. Sediment delivery is more continuous than the episodic supply of multiple-occurrence regional landslide triggering events, and by delivering mostly fine-grained sediment, it has a potentially large impact on water quality.
dc.description.confidentialfalse
dc.format.pagination1972-1988
dc.identifier.citationMcColl ST, Holdsworth CN, Fuller IC, Todd M, Williams F. (2022). Disproportionate and chronic sediment delivery from a fluvially controlled, deep-seated landslide in Aotearoa New Zealand. Earth Surface Processes and Landforms. 47. 8. (pp. 1972-1988).
dc.identifier.doi10.1002/esp.5358
dc.identifier.eissn1096-9837
dc.identifier.elements-typejournal-article
dc.identifier.issn0197-9337
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70644
dc.languageEnglish
dc.publisherJohn Wiley & Sons Ltd
dc.publisher.urihttps://onlinelibrary.wiley.com/doi/epdf/10.1002/esp.5358
dc.relation.isPartOfEarth Surface Processes and Landforms
dc.rightsThe author/sen
dc.rights.licenseCC BY-NCen
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/en
dc.subjectfluvial incision
dc.subjecthillslope erosion
dc.subjectlandslide monitoring
dc.subjectmass movement
dc.subjectsediment yield
dc.subjectslope–channel coupling
dc.titleDisproportionate and chronic sediment delivery from a fluvially controlled, deep-seated landslide in Aotearoa New Zealand
dc.typeJournal article
pubs.elements-id452722
pubs.organisational-groupOther
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