Abstract
Based on SO-DTA and one-destination evacuation, a cell-based regional evacuation model, which embeds CTM and point-queue model, is proposed in this paper. The road network is converted to the cell-node topology structure so as to reduce the constraints. The “traffic holding” problem also be solved in the model by an OSP constraint. And to improve the evacuation efficiency, contra-flow lane is imported. A numerical experiment is conducted to verify the proposed model and algorithm.
Highlights
With the developing and expanding of cities, security issues are potential threatened by various disasters
When contra-flow lanes are deployed on cell a, the capacity Vam and the holding capacity Ha of cell a are changed as Table 1
The model is solved using “lingo” and the result we get is that : (1)The system cost is 22 350 minutes and the time for evacuation is 16 minutes. (2)To improve the efficiency of evacuation, we can obtain from the result that these links, including GD, JG, KM, JM, KI, IF, FC and MH, need to deploy contra-flow lanes keeping the system optimal. (3)By analysis the result seriously, “traffic holding” problem do not happen in our model. (4)we can get that how much demand is loaded into the network every time interval
Summary
With the developing and expanding of cities, security issues are potential threatened by various disasters. Constructing models is the core of an evacuation. The “traffic holding” problem often happens in this model and its cell-connector topology structure increases the constraints. In part, these observations motivated our study. The first and primary goal of this paper is to construct a cell-based regional evacuation model, which embeds the idea of one-destination evacuation. Using point-queue model, the road network is converted to cell-node topology structure to reduce constraints. The “traffic holding” problem be solved in the model by an OSP constraint. Based on the model proposed, the deployment strategy of contra-flow lane in the premise of system optimization is optimized in this paper to improve the efficiency of evacuation. A numerical experiment is conducted to verify the proposed model
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