A bi-level representational model of hazardous material supply chains

Modelling the transportation and storage tasks associated with supply chains is usually based on a tacit or mathematical representation of physical flows. However, remaining at this level of representation seems inadequate for risk management. This study proposes to insert new graphical tools into the models to improve the representation of hazardous material supply chains. This representational model enables us to show physical flows and contractual flows at the same time, and highlights the responsibility interactions and risk transfers among the numerous stakeholders involved: producers, carriers, storage enterprises, intermediaries and consumers.