Bulk density 1 Colluvial landslide Fractal dimension 1 Granitic gneiss 1 Granitic gneiss residual soil 1 Landslides 1 Moisture 1 Moisture determination 1 Parameter estimation 1 Regression analysis 1 Regression modelling 1 Residual soil 1 Response-surface methodology 1 Risk assessment 1 Risk perception 1 Shear flow 1 Shear parameters 1 Shear strength 1 Shear strength parameters 1 Shears strength 1 Soil testing 1 Soils 1 Surface properties 1 article 1 bedrock 1 bulk density 1 fractal analysis 1 granitic gneiss residual soil 1 landslide 1 moisture 1