Optimization of the supply and demand allocation and distribution path of food supplies under flood scenarios:A case study in Fengxian District,Shanghai
The supply and demand allocation and logistics optimization of emergency materials are important support for emergency materials management and decision-makings.This study proposes a supply-demand analysis based material supply point allocation method,which on the basis of the optimal supply and demand allocation model.This method takes into account the constraint condition that the market reserve point must simultaneously supply both the affected and original demand points with supportive materials.Compared to traditional methods,this approach further improves the rationality and accuracy of material supply and demand analysis.Based on the allocation of material supply points,a method for optimizing the emergency material distribution path under flood scenarios is further developed.This method is based on real road networks,using"Degree""Squares Clustering Coefficient"and"Road Design Daily Traffic Volume"to evaluate the reliabil-ity of road sections,and fully considers the impact of the flood disaster on the road travel time.It aims to achieve the shortest path travel time and the highest path reliability,using heuristic algorithms to solve the op-timal path.A case study was conducted in Fengxian District,Shanghai,China.Through comparative analysis of multiple scheme scenarios of collaborative supply between the market and government,it was found that the G scheme(100％government supply)required a longer distribution time and resulted in a higher overall time cost,which could lead to the timeout situation for emergency response missions.The S plan(100％market sup-ply)had a lower delivery efficiency and was prone to waste of human and transportation resources.However,the S1500 scheme(the market supplies the shelters within the 1 500 m coverage range and the government sup-plies the remaining shelters)was a collaborative supply scheme that was suitable for all 3 types of materials(water,rice,milk(infant formula))in the case study.The research results can provide decision supporting for emergency rescue and relief efforts of relevant departments in the study area.The methods proposed in this pa-per can provide methodological references for related studies in other regions.
emergency food materialsallocation of supply and demanddistribution path optimizationcol-laborative supply of emergency materialsflood disaster
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