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首页> 外文期刊>EURO journal of transportation and logistics >A network flow model of the Northern Italy waterway system
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A network flow model of the Northern Italy waterway system

机译：意大利北部水道系统的网络流量模型

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The objective of this study was to develop a mathematical programming model, namely a network flow model, to provide insight into the potential capacity of the Northern Italy waterway system. We estimate the potential flow that can be transferred between the Adriatic sea and inland harbors through the waterway system made of the river Po and its surrounding canals. For this purpose a network flow model was developed, where the capacity of each arc depends on specific characteristics such as the presence of locks or one-way transit bottlenecks. The capacity of the harbors was modeled according to the number of quays and cranes available for freight transfer operations. The mathematical formulation of the problem leads to a variation of the classical maximum flow problem on capacitated networks that is easily solvable to proven optimality in a negligible computing time by any linear programming solver. Several scenarios were studied, with and without navigation in the Adriatic sea, with limited or unlimited navigation along given parts of the river. Future possible scenarios were also considered to evaluate the impact of infrastructure interventions to empower some inland harbors and to make some parts of river Po adapt to higher class barges. This mathematical programming approach based on a network flow model allows for quickly solving realistic problem instances; furthermore it provides quantitative information about bottlenecks, corresponding to binding constraints, owing to post-optimal sensitivity analysis. This provides useful indications for a rational allocation of scarce financial resources to make the waterway system a viable and convenient alternative to other transportation means.
机译：这项研究的目的是开发一种数学规划模型，即网络流量模型，以洞悉意大利北部水道系统的潜在容量。我们估计通过波河及其周围运河构成的水路系统可以在亚得里亚海和内陆港口之间转移的潜在流量。为此目的，开发了网络流量模型，其中每个弧的容量取决于特定特征，例如是否存在锁或单程运输瓶颈。根据可用于货物转运业务的码头和起重机的数量来模拟港口的容量。问题的数学表述导致电容网络上经典最大流量问题的变化，该变化可以通过任何线性规划求解器轻松地在可忽略的计算时间内解决已证明的最优性。研究了几种情况，在亚得里亚海中有无航行，沿河的特定部分航行受限或无限制。还考虑了未来可能出现的情况，以评估基础设施干预措施的影响，以增强一些内陆港口的能力，并使波河的某些部分适应高级驳船。这种基于网络流模型的数学编程方法可以快速解决实际的问题实例。此外，由于优化后的敏感性分析，它提供了有关瓶颈的定量信息，对应于绑定约束。这为合理分配稀缺的财政资源提供了有用的指示，使水路系统成为其他运输方式的可行和方便的替代方案。

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