Comprehensive multi-hazard risk assessment method applicated in urban land-use planning

An original multi-hazard risk assessment method was developed in order to deal with the interactions of multiple hazards and give effective guidance on urban land-use planning.First,an indicator-based approach was used to calculate the initial hazard index of each hazard and to make initial hazard maps.These hazards included earthquake,land subsidence,landslide,rock fall,heavy rainfall,seawater intrusion and coastal erosion.Second,a triggering-triggered model was established to modify the initial hazard index and to update the initial hazard maps.Third,a risk matrix approach was used to combine updated hazard maps and urban land-use types,and to make an integrated risk map.The application results show that using this method can enhance the rationality of multi-hazard assessment,reflect the differences and similarities of multi-hazard risk with respect to different land-use types.It can help decision makers and local planners identify the comprehensive risk of planned land-uses easily.