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Resistance to shallow landslide failure through root‐derived cohesion in east coast hill country soils, North Island, New Zealand
Author(s) -
Preston Nicholas J.,
Crozier Michael J.
Publication year - 1999
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/(sici)1096-9837(199908)24:8<665::aid-esp980>3.0.co;2-b
Subject(s) - cohesion (chemistry) , regolith , landslide , bay , east coast , geology , soil water , friction angle , range (aeronautics) , geotechnical engineering , oceanography , soil science , chemistry , physics , organic chemistry , astrobiology , materials science , composite material
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.