Improvement Research On The City Distribution System Of Fresh Vegetables

As the indispensable product in people’s life, fresh vegetables’ circulating problem had attracted great concern of the society. The distribution of fresh vegetables is the key process to supply people’s normal demand safely and freshly. At the same time, with the rapid development of low-carbon economy, it cannot meet the needs of social development only by reducing cost to optimize logistics process. So there is great significance to study distribution system of fresh vegetables considering both cost and environment.Based on the investigation of fresh vegetables distribution system of Beijing, this paper summarizes the status of the system and divides it into three scenario:direct distribution, one-stage transfer and two-stage transfer according to the number of transfer nodes when deliver. And then summarized the main factors which affects distribution costs and carbon emissions from two aspects of internal operation and distribution between nodes by analyzing the differences of the three scenarios’operation. On the basic of qualitative analysis, this paper builds the system dynamics simulation model of fresh vegetables distribution system to analyze the relationships between the different variables in the internal system more visually. At last, using the first-hand data about distribution system of fresh vegetables in Beijing, this paper makes scenario analysis for the key factors of internal nodes and delivery. And then, according to the results, the writer puts forward suggestions to improve the system from two aspects of internal operation and distribution between nodes.The main achievements and conclusions of this paper are as follows:by optimizing the transfer vehicle model, driving distance, the capacity of processing efficiency, storage and greening area of the internal node, it turns out that using the energy saving electric cars and reduce the average distance by optimizing the layout of the internal node, the cost and the carbon dioxide emissions will reduce. And enhancing the capacity of handling and storage to reduce the rotting rate can make the cost and carbon dioxide emissions drop down effectively. And increasing the recycle package using have the same effect. Although increasing the green area can absorb the carbon dioxide, the effect is weak. Both strengthening the usage of professional delivery vehicles and reducing the transport distance can reduce the cost and carbon dioxide emissions of the system. Changing the factor singly, the optimization result has little impact. When all the elements comprehensive changes, the cumulative costs fell by 10.41%, and total carbon dioxide emissions by 49.75%. Thus, comprehensive changes the elements above have played an important role in optimization of the whole system.Finally this paper puts forward the following optimization suggestions:for the internal nodes, we should accelerate the internal node’s upgrade transformation, optimize the layout to reduce the operation of vehicle cannibalizing, and improve the function of the logistics distribution center in large wholesaling markets, rather than strengthening greening area. We should improve from the source to promote the use of recyclable packaging container, set up recycling incentive mechanism, and set reasonable transfer by banning excessive markets. For the delivery between nodes, we should develop the joint distribution, improve the vehicle loading rate, and reduce the usage of distribution vehicle and the average distance. In the meantime, in order to reduce the loss of vegetables, standardizing the vegetable circulation development, we should promote the development of agricultural products cold-chain logistics and the usage of professional delivery vehicles.