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Titre du Document
Sediment production from Cyclone Bola landslides, Waipaoa catchment
Auteur(s)
PAGE M. J. ; REID L. M. ; LYNN I. H.
Résumé
A method for assessing sediment production from landslides was applied in the Waipaoa catchment to quantify landsliding which occurred during Cyclone Bola in 1988, and to assess the contribution landslides made to the suspended sediment load of the Waipaoa River during the storm. Relationships between storm rainfall and landslide frequency, defined for different landslide-prone terrains, were used with a geographic information system containing data on the distribution of landslide terrain, vegetation and storm rainfall, to estimate landslide density in the Waipaoa catchment. Field measurements of landslide dimensions and air-photo-based estimates of sediment delivery allowed calculation of total sediment generation and delivery to streams during the storm. Comparison of calculated sediment input for the portion of the Waipaoa catchment upstream of the Kanakanaia gauging g station with estimates of the total sediment load during the storm indicate that shallow landslides contributed 48% of the storm's sediment load at that site. Calculated inputs from the remainder of the catchment suggest that shallow landslides were responsible for approximately 64% of the sediment load at the mouth of the catchment. While landsliding is the major erosion process during large magnitude rainstorms, landslides contribute only about 10% to 19% of the long-term suspended sediment yield. Landsliding is of lower relative importance over the long term primarily because other erosion processes, suc
Editeur
New Zealand Hydrological Society
Identifiant
ISSN : 0022-1708 CODEN : JLHYAD
Source
Journal of hydrology. New Zealand A. 1999, vol. 38, n° 2, pp. 289-308 [Illustrations : Tableau] [bibl. : 2 p.1/4]
Langue
Anglais
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