Abstract
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 0·2–7·6 kPa, consistent with earlier findings. This range is narrowed further, to 0·7–6·9 kPa, with assumptions regarding soil moisture status at failure. Copyright © 1999 John Wiley & Sons, Ltd.
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