Resistance to shallow landslide failure through root-derived cohesion in east coast hill country soils, North Island, New Zealand
✍ Scribed by Preston, Nicholas J.; Crozier, Michael J.
- Book ID
- 101219715
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 419 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0360-1269
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✦ Synopsis
Measured shear strength (cohesion and friction) of airfall-derived east coast hill country regolith is insufficient for the maintenance of existing regolith depth/slope angle relationships in the catchment of Lake Waikopiro in northern Hawke's Bay, New Zealand. If these regoliths are attributed with an additional increment of cohesion derived mechanically from a turf mat membrane, existing depth/slope angle distributions are explicable. Sites where failure has occurred have been measured, and back-analysis used to derive a range of values for additional mechanical cohesion. Values are in the range 0Á2±7Á6 kPa, consistent with earlier findings. This range is narrowed further, to 0Á7±6Á9 kPa, with assumptions regarding soil moisture status at failure.