Construction Of Cold Chain Logistics System For Freshwater Aquatic Conditioning Products

Against the backdrop of the new era,people’s living standards have been significantly improved,new formats such as new catering,new retail and other new business forms have emerged,and China’s conditioning food industry has ushered in a rapid development stage.Freshwater aquatic conditioning products have the characteristics of hygiene,convenience,and high nutritional value,which can meet consumers’ demand for aquatic products with convenience,good taste,safe,and wholesomeness.Cold chain logistics is an important link to ensure the circulation and consumption of freshwater aquatic conditioning products.Although China’s cold chain infrastructure has been continuously improved in recent years,the existing cold chain logistics system still cannot meet the rapidly growing demand for freshwater aquatic conditioning products,and the existing problems of broken links between production areas and sales areas constantly lead to high cold chain logistics costs.Therefore,it is practically meaningful to optimize the cold chain logistics network within the existing system,effectively integrate resources,and reduce the costs of cold chain logistics while ensuring the quality of freshwater aquatic conditioning products.The main research contents are as follows:1.Determination of cold chain logistics network structure with analysis of related theories of cold chain logistics.Based on defining the concept of freshwater aquatic conditioning products and analyzing relevant cold chain logistics theories,combined with the circulation form of freshwater aquatic conditioning products in Wuhan,a three-level cold chain logistics network structure centered around processing-distribution centers,"aquaculture cooperatives--processing-distribution centers--supermarkets," has been determined.2.Establishment of physical model and bi-level programming model for cold chain logistics network of freshwater aquatic conditioning products.Based on the establishment of the physical model for the cold chain logistics network of freshwater aquatic conditioning products in Wuhan,and through an analysis of optimization principles,influencing factors,operational procedures,and commonly used methods for optimizing the cold chain logistics network of freshwater aquatic conditioning products,a bi-level programming model was selected to jointly optimize the cold chain logistics network.An upper-level planning model was constructed with the objective of minimizing the costs of processing-distribution centers location,while a lower-level planning model was constructed with the objective of minimizing distribution and transportation costs.In addition,the lower-level planning model included the costs of goods damaged during transportation,which describes the impact of temperature fluctuations during loadingunloading,and transportation on the quality of freshwater aquatic conditioning products.3.Design algorithm for solving the bi-level programming model of the cold chain logistics network of freshwater aquatic conditioning products.Through a comparative analysis of different solution methods,a bi-level genetic algorithm suitable for solving the bi-level programming model was designed.The upper-level genetic algorithm served as the core of the entire algorithm,determining the location of the processing-distribution centers,then the lower-level algorithm was integrated into the upper-level algorithm.In the lowerlevel genetic algorithm,the roulette wheel selection method and the best preservation strategy were combined to accelerate the convergence speed of the algorithm.Based on the site selection results,the supermarket distribution and corresponding delivery routes were calculated.And the total cost of the cold chain logistics network was minimized through repeated iterations.4.Optimization of cold chain logistics network for freshwater aquatic conditioning products in Wuhan.Based on the collection and analysis of data on the freshwater product supply points,candidate processing-distribution center locations,residential areas and supermarket locations,supermarket demand,service time,etc.,the demand for freshwater aquatic conditioning products in Wuhan was calculated to generate the example data for this paper.The optimal processing-distribution centers location and supermarket distribution,as well as the corresponding delivery routes,were determined.Compared with models that only consider the optimal processing-distribution centers location or delivery route optimization,the total cost of cold chain logistics was reduced by720128 yuan and 1161561 yuan,respectively.Finally,corresponding logistics technologies and preservation techniques were selected for the four major links of cold chain logistics and the biological characteristics of freshwater aquatic conditioning products.