The increase in extreme weather events arising from climate change is posing serious threats to the sustainability of transport systems, creating the need for improved tools for decision support for more effectively managing natural disasters. There are numerous transport‐related decisions that are required during the response, recovery and preparedness stages of the disaster management cycle. This paper describes the development and application of the Intelligent Disaster Decision Support System (IDDSS), which provides a platform for integrating a vast range of road network, traffic, geographic, economic and meteorological data, as well as dynamic disaster and transport models. Initial applications to the response and planning for floods and fires are presented to illustrate some of its capabilities. The IDDSS can be used to improve disaster management, which in turn will increase the sustainability of transport networks. 相似文献
The need for sustainable energy sources, as well as the current energetic crisis involving the majority of markets, has promoted the use of cryogenic liquefaction for the transportation and storage of natural gas (i.e., LNG). To guarantee the development of a robust and safe infrastructure, a complete understanding of the main phenomena occurring at low temperatures is paramount. In this sense, the largest grey areas are the characterization of the combustion at low-initial temperature and the interactions between water and cryogenic liquid. For these reasons, this work presents an experimental campaign on the possible mitigation strategies for the mitigation of consequences related to the accidental release of LNG. Particular emphasis was posed on the direct and indirect effects of water on cryogenic pool fire. The former resulted in a significant increase in the dimensions of fire (∼+50%) and burning rate (∼300%) with respect to the case with no direct contact between water and LNG, whereas the latter generated an abrupt decrease in the measured temperatures (<100 °C). The use of an emergency flare to empty an LNG tank was tested, as well. The spatial distribution of temperature was monitored along with the time to guarantee the safe operability of this equipment in the case of LNG combustion. The explanations for the observed phenomena and trends were provided, allowing for the development of safe procedures for the emergency response related to cryogenic fuels. 相似文献
The assessment of the consequences of high pressure releases of flammable gases is a fundamental requirement for the safe design and operation of industrial installations, plants and pipework. A scenario of interest concerns a high pressure jet-fire following the ignition of a gas jet release which results in a thermal loading to the surroundings and possibly leads to accident escalation.
In the present paper, a case study is presented: two parallel-laid natural gas pipelines have been considered, the accidental scenarios which may possibly occur as a consequence of a pipeline failure have been discussed and the thermal effects caused by the jet-fire developing from different rupture sizes have been assessed.
Three scenarios have been analyzed, considering the pipelines being within a highly congested area: (i) large failure and vertical jet with detached flame; (ii) small failure with jet fire directly impinging on the parallel pipeline; (iii) small failure with pipeline engulfed within fire.
Once the temperature gradient through the pipeline wall has been found, the stresses deriving from pressure load and steel differential expansion have been analytically calculated and compared with the yielding stresses at the temperature achieved by the pipeline wall.
In the first scenario the pipeline is able to resist without major problems; in the second case the pipeline rupture is likely to occur; in the third scenario the pipeline resists to the applied loads but with a low margin to yielding.
It is understood that the analysis results are very much dependent on the utilized hypotheses, therefore a sensitivity analysis was performed in order to assess the variation of the results as a function of the variation of problem data; this analysis identifies the large influence of the parameters on the final result. 相似文献
Famines have long been characterised by rapidly shifting dynamics: sudden price spirals, sharp increases in mortality, the media frenzy that often accompanies such spikes, the swift scaling up of aid flows, and a subsequent decline in interest. In arguing that these aspects of famine have been largely ignored in recent years due to attention to the famine process', this paper attempts to make these dynamics more explicit by applying systems thinking. It uses standard archetypes of systems thinking to explain six situations—watch, price spiral, aid magnet, media frenzy, overshoot, and peaks—that are present in many famine contexts. It illustrates their application with examples from crises in Ethiopia, Malawi, Niger, and Sudan. The paper contends that the systems approach offers a tool for analysing the larger patterns in famines and for pinpointing the most appropriate responses to them, based on an awareness of the dynamics of the crises. 相似文献
Just as a stream of genetically modifiedcrops looked set to be approved for commercialproduction in the European Union, the approvalprocedure appears to have become bogged down onceagain by disagreements among and within member states.Old controversies have resurfaced in new forms. Theintractability of the issues suggests that theregulatory procedure has had too narrow a focus,leaving outside its boundary many of the morefundamental aspects that cause people in the EuropeanUnion most concern. Regulators have come underconsiderable pressure to ensure their risk assessmentdecisions are soundly science-based. Ethical issueshave been deemed to lie beyond the scope of theregulatory procedure, as a matter to be consideredseparately by professional ethicists. Yet it has beensuggested that all environmental controversies at rootinvolve disputes about fundamental ethical principles.This paper examines how the ethical issues arecurrently suppressed or sidelined. It discusses how anappreciation of systems thinking and a check on thevalues that underpin decisions, using boundary testingquestions, might contribute to a more constructiveregulatory dialogue, with ethical issues considered asintegral in a way that takes better account ofpeople's concerns. 相似文献
Abstract: Different components of global environmental change are typically studied and managed independently, although there is a growing recognition that multiple drivers often interact in complex and nonadditive ways. We present a conceptual framework and empirical review of the interactive effects of climate change and invasive species in freshwater ecosystems. Climate change is expected to result in warmer water temperatures, shorter duration of ice cover, altered streamflow patterns, increased salinization, and increased demand for water storage and conveyance structures. These changes will alter the pathways by which non-native species enter aquatic systems by expanding fish-culture facilities and water gardens to new areas and by facilitating the spread of species during floods. Climate change will influence the likelihood of new species becoming established by eliminating cold temperatures or winter hypoxia that currently prevent survival and by increasing the construction of reservoirs that serve as hotspots for invasive species. Climate change will modify the ecological impacts of invasive species by enhancing their competitive and predatory effects on native species and by increasing the virulence of some diseases. As a result of climate change, new prevention and control strategies such as barrier construction or removal efforts may be needed to control invasive species that currently have only moderate effects or that are limited by seasonally unfavorable conditions. Although most researchers focus on how climate change will increase the number and severity of invasions, some invasive coldwater species may be unable to persist under the new climate conditions. Our findings highlight the complex interactions between climate change and invasive species that will influence how aquatic ecosystems and their biota will respond to novel environmental conditions. 相似文献