Establishing the frequency and magnitude of landslide-triggering rainstorm events in New Zealand |
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Authors: | Thomas Glade |
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Institution: | (1) Research School of Earh Science, Department of Geography, Victoria University of Wellington, Wellington, New Zealand, NZ |
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Abstract: | Landslide erosion has an established history in New Zealand. Some broad estimates of economic costs for short-term event
damage, long-term landslide damage, and proactive measures are provided and compared on a national and international level.
Frequency and magnitude analysis based on historical records of landslide-triggering rainstorms demonstrates that 1) landslides
are a nationwide problem, 2) recognition and recording of these events is dependent on public awareness and therefore related
to population distribution and extent of urbanized areas, and 3) deforestation increases the frequency of landslide events,
but not necessarily the total magnitude of their impact. However, some regions such as Northland and Wellington in the North
Island and Greymouth and North Otago in the South Island are more frequently and more strongly affected than others. Landslide
occurrence in time and space, within representative study areas in Hawke's Bay, Wairarapa, and Wellington, is correlated with
the climatic variable daily precipitation. Different regional hydrological thresholds for landslide triggering are established.
Received: 15 Ocotober 1997 · Accepted: 25 June 1997 |
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Keywords: | Landslides recognition Deforestation Frequency Magnitude Rainfall thresholds |
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