Vulnerability assessment of urban road network from urban flood

With the rapid progress of urbanization, cities’ demands for traffic flood control are steadily on the increase, and people are gradually paying more attention to traffic safety and environmental issues. Considering the considerable convenience and service ability of liquid air and corresponding products, people have begun to switch to using liquid air as an emergency coolant. However, this air’s cryogenic operation and vigorous vaporization expansion restricts its widespread application. Our study explores innovative applications based on liquid air spray/evaporation icing and natural melting, which can be applied to urban flood protection. This study also includes a brief introduction to the nature of liquid air and road icing, a conceptual design based on liquid air flash evaporation (for urban flood protection), and the modeling and solving of natural road ice melting. This paper introduces many innovative key technologies, which include the rapid solidification of floods to form emergency ice dams or diversion channels and the application of liquid air spray to form icy roads for the temporary passage of small cars or pickup trucks. Additionally, the economic estimations are performed by using downtown traffic flood control in Wuhan as an example to showcase our innovative scheme for applying liquid air spray/vaporization for urban traffic flooding control, which is practical, pollution free, and cost effective. Our innovative scheme will be promising for flood control in modern cities.

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“…GrPr, 10 4 ≤ Gr, Pr ≤ 10 10 (15) where L is the characteristic length, which is taken as the length for a general bridge water pit.…”

Section: The Modeling and Solution Of Natural Road De-icingmentioning

confidence: 99%

“…In coastal or riverside cities such as Wuhan, with river overtopping and tidal floods, serious floods will occur in most cases [14]. For effectively managing and alleviating floods in coastal or riverside cities, several strategies are often proposed to solve this problem [15]:…”

Section: Introductionmentioning

confidence: 99%

A New Integrated Scheme for Urban Road Traffic Flood Control Using Liquid Air Spray/Vaporization Technology

Zhang

Tang

et al. 2020

Sustainability

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“…Another important disruption mechanism of floods to the road network is the scouring of bridges [7,19,34], which can cause both short-term or long-term damage to road network connectivity. Relevant studies in the literature that are aimed at tackling the flood vulnerability of critical infrastructure networks could be categorized into two main types: (1) graphtheory based topological approaches that focus on topological integrity of the network; and (2) hydrological approaches that model the flood propagation process in (or around) critical infrastructure in urban areas [31]. Each of these methods considers the flood vulnerability problem from different angles; consequently, each approach only reflects some parts of the whole picture.…”

Section: Introductionmentioning

confidence: 99%

Characterization of vulnerability of road networks to fluvial flooding using SIS network diffusion model

Abdulla

Kiaghadi

Rifai³

et al. 2020

J Infrastruct Preserv Resil

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This study aims to characterize the vulnerability of road networks to fluvial flooding using a network diffusion-based method. Various network diffusion models have been applied widely for modeling the spreading of contagious diseases or capturing opinion dynamics in social networks. By comparison, their application in the context of physical infrastructure networks has just started to gain some momentum, although physical infrastructure networks also exhibit diffusion-like phenomena under certain stressors. This study applies a susceptible-impacted-susceptible (SIS) diffusion model to capture the impact of flooding on the road network connectivity. To that end, this paper undertook the following four steps. First, the road network was modeled as primal graphs and nodes that were flood-prone (or the origins of the fluvial flood) were identified. Second, temporal changes in the flood depth within the road network during a flooding event were obtained using a data-driven geospatial model. Third, based on the relationship between vehicle speed and flood depth on road networks, at each time step, the nodes in the road network were divided into two discrete categories, namely functional and closed, standing for Susceptible and Impacted in the SIS diffusion model, respectively. Then, two parameters of the SIS model, average transition probabilities between states, were estimated using the results of the hydraulic simulation. Fourth, the robustness of the road network under various SIS diffusion scenarios was estimated, which was used to test the statistical significance of the difference between the robustness of the road network against diffusions started from the randomly chosen nodes and nodes with different high centrality measures. The methodology was demonstrated using the road network in the Memorial super neighborhood in Houston. The results show that diffusive disruptions that start from nodes with high centrality values do not necessarily cause a more significant loss to the connectivity of the road network. The proposed method has important implications for applying link predictions on road networks, and it casts significant insights into the mechanism by which cascading disruptions spread from flood control infrastructure to road networks, as well as the diffusion process in the road networks.

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“…In fact, the anthropization of the territory has enhanced the impervious surfaces and the flooding effect due to the reduction in hydrological losses and in flow resistance [12], [13] Furthermore, the anthropization rises the discharge and the runoff volume, and reduces the concentration time [14]- [16]. Moreover, the increase in anthropogenic pressure has altered the river dynamics due to the constriction of the riverbeds to build houses, roads, economic activities etc., that increasing the flooding risk, especially in urban areas [17]- [19]. This issue is important in territories like Mediterranean region, that are prone to flooding events [20]- [22].…”

Section: Introductionmentioning

confidence: 99%

River Anthropization: Case Studies in Reggio Calabria, Italy

Versaci

Minniti

Foti

et al. 2018

WIT Transactions on Ecology and the Environment

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The considerable anthropic pressure that has affected most of Italian territory in the last 60 years has altered natural conditions of coasts and river, thus increasing exposure to environmental risks. For example, increase in soil waterproofing caused a reduction in hydrological losses with a rise in flood flows (with the same rainfall conditions), especially in urban areas. This issue is important in territories like Mediterranean region, that are prone to flooding events. From this point of view, recent advances in remote sensing and geographical information system (GIS) techniques allow us to analyze morphological changes occurred in river and in urban centers, in order to evaluate possible increases in environmental risks related to the anthropization process. This paper analyzes and describes the effects of anthropization process on some rivers in the southern area of the Reggio Calabria city (the Sant'Agata, Armo and Valanidi rivers). This is a heavily anthropized area due to the presence of the airport, highway and houses. The analysis was carried out using QGIS, through the comparison of cartography data of the last 60 years, which consists of aerophotogrammetry of 1955, provided by Italian Military Geographic Institute, and the latest satellite imagery provided by Google Earth Pro.

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Vulnerability assessment of urban road network from urban flood

Cited by 159 publications

References 27 publications

A New Integrated Scheme for Urban Road Traffic Flood Control Using Liquid Air Spray/Vaporization Technology

A New Integrated Scheme for Urban Road Traffic Flood Control Using Liquid Air Spray/Vaporization Technology

Characterization of vulnerability of road networks to fluvial flooding using SIS network diffusion model

River Anthropization: Case Studies in Reggio Calabria, Italy

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