Earthflow occurrence during high intensity rainfall in Eastern Otago (New Zealand)
✍ Scribed by M.J. Crozier
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- English
- Weight
- 612 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0013-7952
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✦ Synopsis
The characteristics and effects of an unusually heavy rainstorm causing landsliding, are discussed. The storm produced up to 8 inches of rain in 48 h during a month, which, over the last 20 years, has had a mean of 2.03 inches. These weather conditions triggered numerous landslides in an area which is believed to have become progressively unstable over the last one hundred years.
A theory for the progressive development of unstable land in the locality is outlined. It centres around the change of soil properties induced by a removal of the indigenous forest.
The study lists the relevant morphological and geological characteristics of a typical earthflow and gives an account of the observed processes of earthflow occurrence.