ABSTRACT:

The factors that influence landslide susceptibility, hazard and risk as well as the development of relevant maps in a GIS environment have been discussed by a number of authors including the writers. A number of approaches for qualitative or quantitative landslide risk assessments have also been covered in several papers. This paper explores the progress that has been achieved at the University of Wollongong in the development of innovative techniques for landslide hazard and risk assessment. Particular attention is given to the development of a hazard-consequence matrix approach based on limited data which can be adopted for different applications such as a) natural slopes in urban areas, b) excavated slopes and c) embankments on sloping areas supporting roads and or railway lines. The implementation and validation of the matrix approach is discussed. The consistency or reliability of assessments made individually by two professionals for 10 sites are discussed.

INTRODUCTION

Three broad categories or types of assessment were recently identified by the authors as important for a comprehensive coverage of landslide hazard and risk (Ko Ko et al, 1999). In this paper, these are designated Type I, Type II and Type III assessments and key details of a comprehensive Type I approach form an important part of this paper. However it is considered essential to briefly outline first the nature of these three types of assessments since no one type should be considered in isolation.

Type I Approach

Individual sites are assessed primarily on the basis of site inspections with reliance on experience and judgement especially where detailed subsurface information is lacking or very limited. Ko Ko etal (1999) and Ko Ko (1999) have made a review of several such approaches used in Australia and in other Countries.

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