An integrated hydrological model for rain‐induced landslide prediction

Abstract

This paper describes an extension to the Combined Hydrology And Stability Model (CHASM) to fully include the effects of vegetation and slope plan topography on slope stability. The resultant physically based numerical model is designed to be applied to site-specific slopes in which a detailed assessment of unsaturated and saturated hydrology is required in relation to vegetation, topography and slope stability. Applications are made to the Hawke's Bay region in New Zealand where shallow-seated instability is strongly associated with spatial and temporal trends in vegetation cover types, and the Mid-Levels region in Hong Kong, an area subject to a variety of landslide mechanisms, some of which may be subject to strong topographic control. An improved understanding of process mechanism, afforded by the model, is critical for reliable and appropriate design of slope stabilization and remedial measures.

Statistical approach to storm event-induced landslides susceptibility

“…This question needs to be tested with real data in further study. If one has investigated the land cover, soil depth and permeability, this problem may be solvable using hillslope hydrology theory (Freeze, 1978;Dietrich et al, 1995;Borga et al, 2002;Wilkinson et al, 2002;Malet et al, 2005). The Note: Name of each factor is same as that in Table 7.…”

“…To study storm event-induced landslides on a regional scale, a deterministic physical-based method is commonly used which requires the employment of an infinite-slope model and a hydrological model (Okimura and Ichikawa, 1985;Dietrich et al, 1986Dietrich et al, , 1995Keefer et al, 1987; Correspondence to: C.-T. Lee (ct@ncu.edu.tw) and Dietrich, 1994;Wu and Sidle, 1995;Montgomery et al, 1998;Terlien, 1998;Crozer, 1999;Polemic and Sdao, 1999;Iverson, 2000;Borga et al, 2002;Wilkinson et al, 2002;Crosta and Frattini, 2003;Malet et al, 2005;Baum et al, 2005;Salciarini et al, 2006;Claessens et al, 2007aClaessens et al, , 2007bSchmidt et al, 2008). This approach requires the strength parameters, failure depth and soil conductibility for every point in the limit-equilibrium slope stability calculation, a requirement which can cause serious problems in terms of acquisition and control of spatial variability of the variables (Hutchinson, 1995;Guzzetti et al, 1999).…”

Quantification of the influence of preferential flow on slope stability using a numerical modelling approach

“…The limit equilibrium method or infinite slope stability approach is frequently integrated with Richards' equation (Lanni et al, 2013;Ng and Shi, 1998;Godt et al, 2008;Shuin et al, 2012;Wilkinson et al, 2002;Talebi et al, 2008;Greco et al, 2013) or conceptual models (Arnone et al, 2011;Simoni et al, 2008;Qiu et al, 2007) for landslide hazard evaluation. The limit equilibrium method and infinite slope approach assume or search for a potential failure surface.…”

On the variability of the effective friction angle of Saint Lucian soils: investigations through a laboratory database

“…CHASM has been used successfully in previous studies to model the response of specific slopes to vegetation, urbanisation, parameter variation, and rainfall events (e.g., Anderson and Lloyd 1991, Holcombe et al 2016, Almeida et al 2017. A full description of the CHASM model and equations can be found in Wilkinson et al (2002).…”