The Vulnerability Assessment Method of Railway Network

2010 ◽  
Author(s):  
Wei Wang ◽  
Jun Liu ◽  
Li Haiying ◽  
Xi Jiang
Keyword(s):  
Transport System ◽  
Network Topology ◽  
Dynamic Process ◽  
Vulnerability Assessment ◽  
System Performance ◽  
Assessment Method ◽  
Level Of Service ◽  
Railway Network ◽  
Railway System ◽  
Integral Element

Vulnerability in the Railway system is, studied not only from the perspective of network topology characteristic but also as the problem of the level of service relative to structure, nature damage and traffic attribute. Also, emphasis is put on the function of the system rather than the physical network itself, although some of non-serviceability in the railway network is indeed caused by physical failures. The Vulnerability of railway network is thus a decisive factor not only in terms of connectivity, and serviceability, but also in terms of the transport system performance under dynamic process-traffic which should be acknowledged as an integral element within vulnerability assessment. The paper aims at investigating the most typical factors that affect the vulnerability. The vulnerability analysis must consider each factor separately, and, at the same time, as a whole. A method to measure the vulnerability is proposed. Furthermore, this assessment method is used to analyze the Chinese Railway Network (CRN).

scholarly journals Multimodal Transport System Coevolution Model Based on Synergetic Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Fenling Feng ◽  
Qingya Zhang
Keyword(s):  
Transport System ◽  
Order Parameter ◽  
Line Length ◽  
System Capacity ◽  
Mutual Cooperation ◽  
Multimodal System ◽  
Multimodal Transport ◽  
Railway System ◽  
Synergetic Theory ◽  
System Order

This study investigates multimodal transport system evolution law with the consideration of synergetic theory. Compared with previous studies, this paper focuses on understanding influencing factors of system collaborative development. In particular, we have applied a multimodal system order parameter model to obtain the order parameter. Based on order parameters, the coevolution equations of the multimodal transport system are constructed with consideration of cooperation and competitive relationship between the subsystems. We set out the multimodal system followed the coevolution law of the freight system and dominated by the combined effects of order parameter line length and freight density. The results show that the coordination effects between railway, road, and water subsystems are stronger than aviation subsystem; the railway system is the short plank of the system. Some functional implications from this study are also discussed. Finally the results indicate that expansion of railway system capacity and mutual cooperation within the subsystems are required to reach an optimal multimodal transport system.

scholarly journals Vulnerability Assessment as a Basis for Sanitary Zone Delineation of Karst Groundwater Sources—Blederija Spring Case Study

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2775
Author(s):  
Vladimir Živanović ◽  
Nebojša Atanacković ◽  
Saša Stojadinović
Keyword(s):  
Vulnerability Assessment ◽  
Groundwater Vulnerability ◽  
Assessment Method ◽  
Karst Groundwater ◽  
Karst Spring ◽  
Aquifer Recharge ◽  
Protection Zones ◽  
Groundwater Vulnerability Assessment ◽  
Vulnerability Maps ◽  
Dependent Model

The application of groundwater vulnerability methods has great importance for the sanitary protection zones delineation of karstic sources. Source vulnerability assessment of karst groundwater has mainly relied on the European approach (European Cooperation in Science and Technology—COST action 620), which includes analysis of the K factor, which refers to water flow through the saturated zone of the karst system. In the paper, two approaches to groundwater vulnerability assessment have been applied, COP + K and TDM (Time-Dependent Model) methods, to produce the most suitable source vulnerability map that can be transformed into sanitary protection zones maps. Both methods were tested on the case example of Blederija karst spring in Eastern Serbia. This spring represents a classical karst spring with allogenic and autogenic recharge. Dual aquifer recharge points out the necessity for the inclusion of the vulnerability assessment method created especially for the assessment of karst groundwater. Obtained vulnerability maps show similar results, particularly in the spring and the ponor areas, and these zones are most important for future protection. The COP + K method brings out three vulnerability classes that can be directly transformed into three sanitary protection zones. Contrary to the previous one, the TDM method uses water travel time as a vulnerability degree. The results show that the final map can be easily used to define sanitary zones considering different national legislation.

Innovative Suspended Superstructure for the Retrofitting of a Steel Truss Railway Bridge

2018 ◽  
Vol 763 ◽  
pp. 1121-1128
Author(s):  
Marco Mezzi ◽  
Gianluca Nestovito ◽  
Paolo Petrella ◽  
Vincenzo Cefaliello
Keyword(s):  
National Standard ◽  
Railway Network ◽  
Fluvial Erosion ◽  
Railway Line ◽  
Load Models ◽  
Emilia Earthquake ◽  
Structural Capacity ◽  
Railway System ◽  
2012 Emilia Earthquake ◽  
Suspended Bridge

The bridge in Poggio Renatico crossing the Reno river on the railway line between Bologna and Ferrara, consists of steel decks supported by masonry abutments and piers, while foundations and pier caps are made of reinforced concrete. After the 2012 Emilia Earthquake and accounting for the fluvial erosion below the piers foundations, a structural assessment of the bridge was carried out in accordance with to the current Italian rules. Although a sufficient structure capacity against the actual transit loads resulted, the bridge showed some inadequacies with respect to the load models provided by both the national standard for constructions and the guidelines of the Italian railway network company. The retrofitting project consists of an improvement of the structural capacity of all the elements: girders, piers and abutments. An innovative retrofitting solution provides for the strengthening of the existing decks through a suspension system of cables anchored to steel towers standing on both abutments and piers and creating a kind of suspended bridge. The retrofitting is compatible with the normal scheduled interruptions of the rail traffic thereby reducing the maintenance costs of the railway system. The structural solution represents a model easily replicable to solve analogous situations along the railway network.

Twitter-based traffic delay detection based on topic propagation analysis using railway network topology

2019 ◽  
Vol 23 (2) ◽  
pp. 233-247
Author(s):  
Yuanyuan Wang ◽  
Panote Siriaraya ◽  
Yukiko Kawai ◽  
Toyokazu Akiyama
Keyword(s):  
Network Topology ◽  
Railway Network ◽  
Delay Detection ◽  
Propagation Analysis ◽  
Traffic Delay

scholarly journals The Distribution Pattern of the Railway Network in China at the County Level

2019 ◽  
Vol 8 (8) ◽  
pp. 336
Author(s):  
Minmin Li ◽  
Renzhong Guo ◽  
You Li ◽  
Biao He ◽  
Yong Fan
Keyword(s):  
Distribution Pattern ◽  
Geographical Information ◽  
Eastern Region ◽  
Gis Technology ◽  
Railway Network ◽  
Macro Scale ◽  
Social And Economic Development ◽  
Distribution Index ◽  
Railway System ◽  
Network Proximity

Evaluation of the railway network distribution and its impacts on social and economic development has great significance for building an efficient and comprehensive railway system. To address the lack of evaluation indicators to assess the railway network distribution pattern at the macro scale, this study selects eight indicators—railway network density, railway network proximity, the shortest travel time, train frequency, population, Gross Domestic Product (GDP), the gross industrial value above designated size, and fixed asset investment—as the basis of an integrated railway network distribution index which is used to characterize China’s railway network distribution using geographical information system (GIS) technology. The research shows that, in 2015, the railway network distribution was low in almost half of China’s counties and that there were obvious differences in distribution between counties in the east and west. In addition, multiple dense areas of railway network distribution were identified. The results suggest that it might be advisable to strengthen the connections between large and small cities in the eastern region and that the major urban agglomerations in the midwest could focus on strengthening the construction of railway facilities to increase the urban vitality of the western region. This study can be used to guide the optimization of railway network structures and provide a macro decision-making reference for the planning and evaluation of major railway projects in China.

scholarly journals A discussion on technologies for improving the operational speed of high-speed railway networks

2019 ◽  
Vol 1 (1) ◽  
pp. 22-36 ◽  
Author(s):  
Chun-fang Lu
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Practical Significance ◽  
Railway Network ◽  
High Speed Railway ◽  
Development Status ◽  
Improvement Plan ◽  
Railway System ◽  
Traction Power Supply ◽  
Traction Power

Abstract: China’s high-speed railway network has already achieved speeds of 350 km/h; however, this could be further increased to 400 km/h. After considering the development status and technical level of the high-speed railway system in China, this study indicates that there are four key technologies involved in improving its operational speed: the track, the electrical moving unit, the control system and the traction power supply. Through an experimental analysis, an evaluation index for the high-speed railway is then constructed based on four aspects: safety, comfort, intelligence and environmental protection. Using this system, the rationality of the high-speed railway speed-improvement plan can be scientifically evaluated. The results are of practical significance to the Chinese railway administration, as they can be used to formulate specific plans to increase rail speeds, and therefore promote the rapid development of the high-speed railway network in China.

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