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Chinese Journal of Management Science ›› 2026, Vol. 34 ›› Issue (4): 156-167.doi: 10.16381/j.cnki.issn1003-207x.2024.0283

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Optimization Model and Strategies for Route and Fleet Allocation Considering Port Congestion and Carbon Emission Reduction

Shaolong Hu1,2, Xudong Wang3, Chuanfeng Han4, Lingpeng Meng3()   

  1. 1.School of Economics and Management,Southwest Jiaotong University,Chengdu 610031,China
    2.Key Laboratory of Service Science and Innovation of Sichuan Province,Chengdu 610031,China
    3.China Institute of FTZ Supply Chain,Shanghai Maritime University,Shanghai 201306,China
    4.School of Economics and Management,Tongji University,Shanghai 200092,China
  • Received:2024-02-28 Revised:2024-08-04 Online:2026-04-25 Published:2026-03-27
  • Contact: Lingpeng Meng E-mail:lpmeng@shmtu.edu.cn

Abstract:

In recent years, a discernible incongruence has emerged between the slowly improving service capacity of coastal ports and the escalating pace of maritime requisites. This asymmetry in growth has engendered a recurrent proliferation of port congestion, precipitously impacted the scheduling of maritime fleets and thereby culminated in the clustering of vessels within ports. The confluence of these ramifications has reverberated with profound repercussions upon both regional economies and environmental domains. In response to the entwined issues of port congestion and emissions reduction, a variation inequality model is proffered that optimizes ship routes and allocation strategies. Encompassing considerations of ship propulsion types, varying congestion degrees across distinct ports and alternative harbor options, this model crystallizes around the manifold facets of temporal costs, transport expenditures, and carbon emissions. An improved diagonalization algorithm is devised to solve this problem. Rooted in the context of China's coastal routes, the empirical investigation proffers some insights.As the standard diagonalization algorithm uses network allocation and scalar solutions to determine the iteration direction and step size, it saves 14.61% of the solution time on average to find the same optimal solutions for small-scale problems, compared to the projection algorithm. Furthermore, the improved diagonalization algorithm saves 28.36% of the time compared to the projection algorithm. More importantly, the improved diagonalization algorithm can find the optimal solution within 12,000 seconds for large-scale problems. Lastly, as port congestion intensifies, (1) Shipping enterprises grapple with escalating costs associated with waiting times and voyage schedule losses. (2) A predilection emerges within shipping entities to divert vessels towards alternative harbors. (3) Maritime enterprises gravitate towards more eco-friendly fuels when confronted with the convergence of lowered clean energy costs or elevated carbon taxation rates.

Key words: ocean transportation, route allocation, port congestion, carbon tax, variational inequality

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