Analysis of urban freight distribution and a city logistics model for İstanbul
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Date
2023
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Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2023.
Abstract
Intensive population growth in metropolitan cities brings with it many problems, such as increased demand, traffic congestion, and environmental degradation. This requires more efficient use of resources and faster resolution of issues. With 15.6 million inhabitants, ˙Istanbul is by far the most populated city in Turkey. Due to the problems experienced in the logistics sector and the current situation of ˙Istanbul’s logistics activities, a city logistics plan for ˙Istanbul is required to provide a sustainable and efficient logistics and freight transportation system. The term “city logistics” aims at e↵ectively managing freight transportation, reducing traffic congestion and minimizing the environmental e↵ects of logistics activities in order to increase the quality of life and reduce costs in cities. This thesis aims to analyze the current state of ˙Istanbul’s freight flows and to develop a linear optimization model and solution methodology with the goal of improving the city logistics problems of ˙Istanbul. Initially , based on ˙Istanbul’s urban transportation network and certain criteria, ˙Istanbul is divided into 105 zones, and supply and demand points are determined. Using this network, ˙Istanbul’s city logistics is modeled using mathematical programming by considering ten di↵erent product categories, four di↵erent vehicle categories, and four di↵erent time intervals. The model optimizes the total transportation and CO2 emission costs under various constraints. It is solved using real data of ˙Istanbul. In order to see the e↵ects of possible outcomes (such as insufficient transshipment center capacity, heavy reliance on electric van usage, di↵erent truck utilization rates, traffic density, limitations on emissions, etc.), di↵erent scenarios are prepared. Finally, the results are analyzed.