A Bi-level Programming Approach for Pre-positioning Emergency Warehouses

In some countries, regional authorities may attempt to rebalance the allocation of national facilities in benefit their own region which, turn, cause disturbances central government’s decision-making proces. Regarding hierarchical nature these types decisions, classical optimization models are not effective and use multi-level programming can increase efficiency planning. Our paper aims address issue a bi-level model conduct location analysis emergency warehouses. A three-echelon relief supply chain is considered which network involves warehouses demand cities. The upper-level decides on warehouses, allocating them lower-level determines allocates points. structure both levels based median location-allocation problem. Three solution approaches presented full enumeration two nested evolutionarymethods (genetic heuristic local search algorithms). For be used Iran, algorithms analyzed for sizes problems. obtained results show proper functioning approaches.