Multi-scale coupling and application of natural disaster risk analysis

Differences in spatial scale appear in expression of natural disaster risk. The large-scale region spans up to global level, regional (continental) level, watershed level of major rivers, the natural regional and national level. Grasping the principle of “good order, reasonable distribution”, the expression of disaster risk map focuses on regional risk general trends and macroeconomic situation. The meso-scale regions contain natural areas, sub-districts, the provinces, cities, regions of administrative division. Risk zoning services are for the regional long-term disaster prevention and mitigation planning. It also provides accurate background parameters for small-scale disaster risk assessment. The small-scale regions include natural state, the district, county, town, village, streets and communities of the administrative divisions. The risk characterization of affected areas is to improve the accuracy of vulnerability assessment. It is also provide technical methods for disaster risk assessment.