Abstract:
Haphazard development activities on mountain slopes and inadequate attention to construction aspects have led to the
increase of landslides and consequently sustaining damage to lives and infrastructure. Nearly 3275 sq.km of area spread
over the Ratnapura District, seems to be highly prone to landslides and mass wastage of 2178 sq.km. Landslides occur
in many regions of Ratnapura district and nearly 90 deaths have been reported according to National Research Building
Organization (NBRO) in 2017. Most landslides or potential failures could be predicted fairly accurately if proper
investigations were performed in time. The primary objective of this study is landslide-hazard mapping and risk
evaluation to determine the real extent, timing, and severity of landslide processes in Ratnapura district. Such
knowledge will provide the most significant benefit to government officials, consulting engineering firms, and the
general public in avoiding the landslide hazard or in mitigating the losses. Hybrid Machine Learning techniques can be
used to develop prediction models using existing data. Ensemble approach based on Support Vector Machine (SVM),
Naïve Bayes model were combined and implemented for the final prediction. This study possesses a strong capability to
predict landslides by causative factors, slope, land use, elevation, geology, soil materials and triggering factor; rainfall
was extracted and applied to the machine learning algorithms. This research introduces a novel architecture to produce
a more relevant and accurate prediction of the landslide vulnerability within the study area. Moreover, it was revealed
that all of the factors had relatively positive relationship with occurrence of landslides. An improvement in hazard
monitoring, accuracy of early warning and disaster mitigation is documented.
