Browsing by Author "Ding, Wenyi"

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    Feasibility of the Northern Sea route with the effect of emission control measures
    (Elsevier, 2023) Kavirathna, Chathumi Ayanthi; Shibasaki, Ryuichi; Ding, Wenyi; Otsuka, Natsuhiko
    Despite shortening voyages between Asia and Europe by the Northern Sea Route (NSR) over the Suez Canal route (SCR), increased NSR’s traffic intensifies vessel-based emissions to the Arctic Sea. This study investigates NSR’s feasibility with a combination of operational and regulatory emissions control (EC) measures against the SCR and NSR’s status quo without EC measures to derive sustainable policy without harming the NSR’s economic feasibility. A mixed-integer nonlinear optimization model decides optimum speeds and heavy fuel oil (HFO)-banned areas for minimizing cost and emissions via NSR. Some scenarios indicate fewer emissions and costs from NSR with EC measures than NSR’s status quo and SCR when emissions taxes are enforced on both routes. EC measures affect NSR’s feasibility depending on ice conditions (ice-free, medium ice, and heavy ice scenarios) and slow steaming potential. A trade-off between economic and environmental objectives encourages combining operational and regulatory EC measures to support NSR’s feasibility.
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    Impact of Northern Sea Route on China's grain imports with EU countries
    (Eastern Asia Society for Transportation Studies, 2023) Ding, Wenyi; Shibasaki, Ryuichi; Kavirathna, Chathumi Ayanthi
    The Northern Sea Route (NSR) has been navigated successfully with the melting polar ice and developing technology, which will impact China's bulk trade with the European Union (EU) countries. This research mainly investigates the effect of using NSR for grain transport with a minimum comprehensive cost, including shipping costs and environemental effects. Integer programming has been applied to optimize the simulation system with 24 routes and six types of vessels (five conventional vessels and one ice-class vessel) in the with-NSR and without-NSR situations. The result shows that the cost will be reduced by 20% with-NSR scenario, and an additional 7% reduction can be found with the increase in the ice-class vessel fleet. Due to the current demand, panamax-sized vessels are the most preferable. This article also provides an optimal and feasible framework for vessel scheduling in with-NSR and without-NSR situations.