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Landslide hazard assessment - ITC


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									                    Landslide hazard assessment: work plan
                                  Vanessa Cuervo Zambrano

The main purpose of this work is to improve the landslide hazard map made in session 03, by
combining statistical, deterministic and heuristic methods, and use size probability information.
For this I propose to compare the results of statistical method used in session 03 with a heuristic
model using spatial multycriteria analysis with the steps learned in session 05. Figure 1, shows a
simple work plan with the general steps to assess the landslide hazard for RiskCity:

                           Figure 1 Flowchart to assess landslide hazard
Landslide hazard assessment

The most complex phase of the project is the landslide hazard assessment. So in order to compare
the results of both methods the same variables are used for each one: slope, aspect, lithology,
occupancy class, distance to rivers, groundwater and landslide areas. The statistical method is
based on bivariate statistical analysis model and the heuristic method on spatial multicriteria

Statistical model: This phase aims to assess the landslide hazard assessment from bivariate
statistical analysis; the main steps are shown in Figure 2.

                          Figure 2 Bivariate statistical analysis for RiskCity
Heuristic model: Based on steps learned in session 5 regarding to the use of multicriteria analysis
in ILWIS, a procedure of spatial multicriteria analysis using SMCE tool to assess landslide hazard is
proposed (Figure 3).

     Figure 3 Spatial multicriteria analysis for RiskCity. Modified from Castellanos & Van Westen (2008)

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