Optimization On The Integrated Land-Sea Transportation Based On The Ro-Ro Mode

The integration of land-sea transportation is the joining one which is on the basis of current land and sea transportation network. In order to meet the needs of sustainable development, relying simply on marine transportation or land transportation has been unable to achieve the ultimate goal. The development of land-sea linkage has turned out to become the main trends of land-sea integrated transportation form for both today and tomorrow. Based on the integration of land and sea transportation, this paper studies and analyzes the integrated land-sea transportation, and optimizes sea transportation, land transportation and the typical links of land and sea connection.Contraposing the sea transport system and taking the optimizing of typical ro-ro ship stowage as a study subject,model of multistage stowage which is based on multi-loading port and the multi-discharging port for finished vehicle has been established. According to the characteristics of the model, the Genetic Algorithm is designed to solve the problem. The validity of the algorithm is verified by a large number of numerical examples. The comparison between the results of the Genetic Algorithm and the results which is based on the actual scheduling rules has been done to validate the efficiency and robustness of the algorithm. A ro-ro ship stowage management information system has been developed to improve the loading and unloading efficiency and accuracy. Therefore, an effective security scheme for ro-ro ships can be provided.Contraposing the land transport system, a mathematical model of routing optimization and cost distribution is established while taking the optimization of common distribution operation as a research subject. The improved Genetic Algorithm has been designed to solve the proposed problem. The experimental results show that, in the common distribution pattern,there is a large scale of saving in total distribution costs, whether it is the overall alliance or the individual distribution center.In allusion to land-sea jointing transportation system, taking the typical optimization link which is the finished vehicle logistics route optimization as research subject,this paper proposes two resource sharing pattern which are shared vehicle and shared distribution center (VDC). And then, under the condition of resource sharing pattern, this paper constructs optimization of mathematical model for finished vehicle logistics path with minimized total cost objective function. Therefore, the proposed problem is designed to be solved by an algorithm which consists of saving algorithm,scanning method and genetic algorithm. Through the way of substituting into actual date, the results show that the method of resource sharing can reduce the transportation cost by about 30%. A comparative analysis of the variation of optimal cost for transportation costs under different road heavy haulage units is carried out. The result is that, the larger the unit transportation cost is, the greater the cost of using separated traditional transport form it will be. Thus, the more likely the shared transportation pattern should be adopted. However, if the unit cost of road heavy haulage is closer to the cost of water transport, the advantage of the shared pattern will be much weaker,meanwhile the rate of cost savings will be lower.