| n | The total number of storage units that can provide emergency rescue materials |
| m | Types of emergency rescue materials | T | Estimated emergency rescue time | A | Emergency rescue location | Bi | The i-th storage unit of emergency rescue materials, i = 1, 2, …, n | qj | Estimated quantity of the rescue material of type j, | ti | Travel time from the storage unit Bi to the rescue location , i = 1, 2, …, n | Lj | The loss caused by the lack of the material of type j in unit time, | | The amount of the material of type j consumed per unit of time, | Sij | The storage capacity for the material of type j provided by the storage unit Bi, i = 1, 2, …, n, | Cij | The cost of sending one unit of the material of type j from the storage unit Bi to the rescue location A, i = 1, 2, …, n, | xij | The demand for the material of type j from the storage unit Bi to the rescue location A, i = 1, 2, …, n, | Rij | The remaining amount of the material of type j from the storage unit Bi to the rescue location A, when the time is ti, i = 1, 2, …, n, |
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