Expert judgement criteria for mapping landslide susceptibility in Tangse Sub-District, Pidie District, Aceh Province, Indonesia

Abstract

Referring to The Center for Research on the Epidemiology of Disaster (CRED) data shows that landslides are responsible for at least 17% of all fatalities from natural hazards worldwide. One of the disasters that commonly occur in Indonesia is landslides, especially in Tangse Sub-District, Pidie District, Aceh Province. The main objective of this research was to determine the parameters and the weight of each parameter that causes landslide susceptibility by using expert judgement criteria. The expert decision can be accepted if the Consistency Ratio (CR) <0.1. The results showed the value of CR from 0.04 to 0.3. Expert judgement decisions with a value of CR = 0.04 (<0.1) were the most reasonable criteria of parameters for mapping landslide susceptibility. Those parameters were slope (42%), rainfall (36%), soil type (12%), and land use (10%). By using these criteria, there were four classes of land susceptibility in this area, namely very high, high, moderate, and low covering an area of 805.40 Ha (1.03%), 46,526.72 Ha (59.27%), 30,600, 38 Ha (38.98%), and 573.61 Ha (0.73%), respectively. Disaster mitigation could be carried out by socializing the vulnerability of landslides, soil protection through slope stabilization, and vegetative conservation.