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通州湾港区位于南通市腰沙、冷家沙区域,地处辐射沙洲南缘,低潮时滩面出露,潮差大.通州湾港区规划方案体量巨大,需通过大面积围填高滩形成港区陆域,围堤建设是陆域形成的前提条件.通过研究波浪、潮流、地质等基础资料,结合模型试验和工程实践,从堤顶高程、堤心材料、抗滑防渗防冲刷分析、施工要点等多方面进行研究、总结大潮差粉砂底质环境下高滩围堤设计的关键技术,为后续工程提供参考、积累经验. 相似文献
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Vitor R. Caldeirinha J. Augusto Felício Sandra F. da Cunha Luís Machado da Luz 《Maritime Policy and Management》2018,45(7):877-892
The diversity of port governance models in the world, sometimes even within the same country, has aroused the interest of researchers. This study is based on contingency theory to support the port governance model. The purpose is to understand the port governance model and the relation with port performance. There are three objectives: to analyze the port governance mechanisms; to analyze the port performance factors; and to understand the influence of the governance model mechanisms on port performance. A factorial analysis was used to determine the main components, and the methodology of the structural equation model was used to analyze a survey sample of 105 valid responses from specialists and managers of port user’s companies that operate in the main Portuguese ports. This study demonstrates that port governance model influences directly the port performance. The main contribution of this paper to the literature is providing a set of factors that public managers may decide when changing the characteristics of the port governance models to ensure their performance. It was also observed the approximation of the port expert vision of port governance with models described in literature. 相似文献
267.
Port competition with accessibility and congestion: a theoretical framework and literature review on empirical studies 总被引:1,自引:0,他引:1
This review interprets recent studies of the interactions between the competition of gateway seaports and the accessibility of landside transportation links to inland regions. Port competition is treated as part of a rivalry between two transportation chains. This article identifies the main modeling approaches and defines the different types of hinterland access systems described in the literature. A general theoretical framework is then proposed to incorporate those key components. The importance of the proposed framework is revealed by comparing and extending results from the literature. Major assumptions that need further empirical verification are identified and discussed, and related empirical studies are reviewed. Finally, avenues for further research are discussed. 相似文献
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This paper develops a theoretical model to analyze the congestion internalization of the shipping lines, taking into account the ‘knock on’ effect (i.e. the congestion delay passed on from one port-of-call to the next port-of-call). We find that with the presence of the knock-on effect, liners will operate less in terminals, and an increase of a liner’s operation in one terminal will decrease its operation in the other. If the liners are involved in a Stackelberg competition, whether they operate more or less in a terminal under the knock-on effect depends on the comparison between the marginal congestion costs of terminals. Furthermore, we find that the coordinated profit-maximizing terminal charges are higher than both the socially optimal terminal charges and the independent profit-maximizing terminal charges. When the knock-on effect is small, the independent profit-maximizing terminal charges are set at higher levels than the socially optimal terminal charges; but when the knock-on effect is sufficiently large, this relationship may reverse. Besides, the capacity investment rules are the same for welfare-maximizing terminal operator and coordinated profit-maximizing terminal operator, while independent profit-maximizing terminal operators invest less in capacity. The larger the knock-on effect, the larger this discrepancy. 相似文献
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Approaches by governments to reforming the way in which ports are governed are critical to how ports operate and fulfil their roles, and much research is devoted to investigating the impact of such reform. Yet, although the challenges of such research are noted, little attention is devoted to questioning whether measuring such impact is actually possible. We argue consideration of this question is fundamentally important for policy makers and researchers. Specifically, if uncertainty exists regarding whether we have measured the impact of the reform, how can we research its effect or justify its introduction? Conversely, a more conscious consideration of whether we can really measure the impact of port governance reform arguably means a more effective contextualization and rationalization of both policy and research. In this polemical paper, we critically consider three salient areas in relation to whether we can really measure the impact of port governance reform: ‘key terms and their ambiguity’, ‘aspects of time and geography’ and ‘issues of methods and context’. We summarize the key issues and offer suggestions for policy makers and researchers to approach them in an aim to both help measure the impact of port governance reform and also aid future policy development. 相似文献
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Norwegian port connectivity and its policy implications 总被引:1,自引:0,他引:1
Haiying Jia Ove Daae Lampe Veronika Solteszova Siri P. Strandenes 《Maritime Policy and Management》2017,44(8):956-966
The importance of a seaport depends on how well it is connected in a transportation network. A port’s connectivity is therefore one of the key issues in determining its competitiveness and developments in regions and countries. We construct a port connectivity index for major Norwegian ports based on a unique dataset derived from the automated identification system (AIS) for multiple vessel types over a 7-year period. Port connectivity is evaluated empirically by the number of unique vessel visits, vessel sizes, and cargo sizes. The research has implications for port authorities and policy makers in the areas of port planning, infrastructure investment, short sea shipping promotion, and environmental policies. The contributions of this research are twofold. First, the methodology linking the AIS vessel-tracking system with port connectivity is a pioneering empirical application of maritime big data. Second, the port connectivity index is constructed for multiple vessel types and regional port groups, which is an improvement from the current literature where conceptual measures are constructed based on hypothetical and usually too simple optimization rules. The methodology can be easily expanded to other regions in the world. 相似文献