Application of Stakeholder Engagement based Risk Management System on Geological Hazards:A Case Study in Wenchuan Earthquake Hit Region

摘要

Efficient Risk management is a very systemic and involved task because of the uncertainties and complexities.Geological hazards including landslides,debris flows rock falls and rock avalanche play an important part of the Wenchuan earthquake disaster chain.With the increasing rate and magnitude of precipitation around the world in the context of global climate change,extraordinary storms hit the Wenchuan earthquake region,and triggered mass of geological hazards (geohazards) which became the huge strike on the newly rebuilt settlement of local community.Because there were innumerable hazards sites,the engineering project only focused on those threat settlements and with huge volume.As a result,the risk governance and management of the post-earthquake geohazards is very essential for disaster reduction and mitigation.This paper presents a case study of stakeholder engagement based extraordinary storms triggered risk management system including geological hazards prediction and monitoring in Chengdu city,Sichuan Province.This system is carried out successfully by the involvement of government,research centre and local community,government play the decision-making part,research centre play the technical support part and local community play the activity part.the probability based prediction method of regional rainfall-induced geohazards is proposed and an early warning system for slope disasters was proposed to fulfil the management of the risk of geohazards.By trilateral cooperation and communication during the rainy season after the Wenchuan earthquake,successful prediction and hazards monitoring was carried out in the study area.