Methods of air traffic management in the airport area including the environmental factor

In the modern approach to air traffic management (ATM), issues related to air quality and climate protection have led to the introduction of a growing number of new restrictions instead of having these issues be the objectives of actions taken. The aim of the study was to investigate whether it is possible to improve air quality while controlling pollution emission by introducing changes in the organization of air traffic control at the airport. For this purpose, mathematical models of emissions were created. These concern the movement of aircraft near the airport and emission of carbon dioxide and the spread of human health related substances emitted from a landing airplane's engine. The first case refers to the possibility of using different arrival procedures. The second case was to adapt the Pasquill formula by treating landing aircraft as a sequence of point-source emissions. As a result of applying the designed models and software tools, it was proven that both a change in the arrival trajectory and a change of the runway can contribute to a reduction of CO₂ emission into the atmosphere. The emission maps created for different aircraft approach profiles show the ability to control the local concentration of harmful emissions. The study clearly shows that the current approach of maximizing throughput is not beneficial to air quality. ATM services should consider the use of other variants of air traffic organization, particularly during periods of reduced traffic.     

铁路运输通道现状分析与发展设想

结合各分类区段客流货流密度,分析我国铁路网的基本特征,探讨铁路运输通道含义及其作用,研究我国铁路运输通道现状及发展布局。     

高速铁路对京沪两地间客运市场影响分析

根据有关客运专线运量预测方法,预测北京到上海2012年的客运基线运量,京沪高速铁路建成运营后的转移运量、诱发运量。预测分析表明,京沪高速铁路通车运营后将会产生69．68％的转移运量和30．32％的诱发运量,理论上有可能转移京沪间民航85．77％的趋势客运量。     

Exploring the dynamic linkages between tourism growth and environmental pollution: new evidence from the Mediterranean countries

ABSTRACT

The present study explores the impact of tourism on environmental pollution using a comprehensive set of air pollutants, namely CO₂, CO, NO_x, SO₂, PM_2.5, and PM₁₀, in a multivariate framework under the context of the Mediterranean countries. The panel cointegration tests indicate that there is a long-run equilibrium relationship between environmental pollution, energy consumption, economic development and tourism growth. The tourism-induced EKC hypothesis is validated for four out of six air pollution indicators in the Southern Mediterranean countries, whereas in the Northern Mediterranean region we fail to document any evidence supporting the hypothesis. In addition, tourism growth has a differential impact on different air pollution indicators across regions. The major findings from the panel Granger causality tests show that bidirectional causality exists between four air pollutants (CO₂, NO_x, SO_2, and PM_2.5) and tourism and unidirectional causality runs from CO and PM₁₀ to tourism growth in the Northern Mediterranean. In contrast, there is a feedback relationship between environmental pollution (CO and NO_x) and tourism growth and one-way causality running from environmental pollution (CO₂, SO_2, PM_2.5, and PM₁₀) to tourism development in the Southern Mediterranean.     

网络拓扑结构对交通流量分布特性的影响分析

分析城市交通网络特性,建立双层城市交通网络模型,其中下层为道路网络,上层为出行网络.以节点平均负荷、拥堵节点、网络负荷标准差、基尼系数为主要指标,研究居民出行网络拓扑结构变化过程中道路网络流量分布的变化情况.研究结果显示,出行网络拓扑结构对交通量分布有较大影响,且存在最优出行网络结构,使城市交通状况达到最佳.     

Will new technology be sufficient to solve the problem of air pollution caused by Swedish road transport?

In this article, levels of future specific vehicle emissions and the energy efficiency required to match long-term environmental targets are estimated. The possibility of reaching these targets is also evaluated. It appears to be possible to achieve sufficiently large reductions in both nitrogen oxide (NO_x) and non-methane volatile organic compound (NMVOC) emission to meet long-term Swedish environmental requirements even with continuing transport growth. Combining sufficiently large carbon dioxide reductions with transport growth seems to be more difficult and would require major breakthroughs regarding drive systems, materials and vehicle construction. Such technological developments cannot, however, be entirely ruled out.     

交通运输系统的耦合过程分析

从综合交通系统的内部耦合和外部耦合两个方面分析综合交通系统的耦合发展过程,内部耦合表现为复杂系统内部层次性过程中由低到高的构成过程以及各自系统之间关系界面。外部耦合解析交通系统与社会经济、自然环境、社会文化三个复杂系统的互动发展过程以及关系界面．为深入了解交通系统及其环境关系提供参考。     

北京丰台站客运枢纽区域交通改善策略研究

在对国内外研究现状分析的基础上,立足于北京丰台站交通现状分析与评价,针对现状问题和路网约束条件,进行交通策略设计,提出交通改善方案和措施,并运用交通仿真软件对方案进行仿真评价和敏感性分析,给出推荐方案。同时提出相应的交通管理和组织措施。     

Reassessing traffic accidents in developing countries

Current approaches to traffic accidents in developing countries have followed methods utilized in industrialized countries, based on the ‘man-vehicle-road’ causal factors. The persistence of poor traffic safety conditions attests to the inadequacies of these methods. The paper proposes that current unsafe conditions have to be analyzed instead in the context of the physical, political, technical and enforcement environments. Alternative approaches are suggested, based on the acknowledgment of the accident as an environmentally related problem and the acceptance of the safe circulation space as a political right. Accordingly, alternative policy actions are suggested.     

Exploring environmentally sustainable traffic signal warrant for planning application

With the concerns over the greenhouse gas (GHG) emissions associated with the surface transportation, the environmentally sustainable traffic signal warrant is essential to provide guidelines for making environmentally conscious decisions about control types at intersections. This research conducted a pilot study on developing CO₂ emissions-oriented traffic signal warrants. Intersection control types that were analyzed for this research include two-way stop, four-way stop, traffic signal, and roundabout. Two environmentally sustainable traffic signal warrants were proposed: Type I (without roundabout) and Type II (with roundabout). The proposed traffic signal warrants were compared with the existing mobility-oriented traffic signal warrant of the Manual on Uniform Traffic Control Devices (MUTCD) in terms of CO₂ emissions and total delay. The measurements were collected and estimated using a microscopic traffic simulation tool, Verkehr In Stadten—SIMulationsmodell (VISSIM). The environmentally sustainable traffic signal warrants show that the annual CO₂ emissions of the ground transportations in the USA were reduced by 7.2% with Type I warrant and 13.9% with Type II warrant.     

TRIBUTE: Trip-based urban transportation emissions model for municipalities

This research aims at developing modeling and scenario-comparison tools to explore the impacts of various transportation and land use planning policies on changing travel behavior and eventually greenhouse gas (GHG) emissions. A Trip-Based Urban Transportation Emissions (TRIBUTE) model is developed. Data required for TRIBUTE comes from household travel surveys and emissions inventories, which is a major advantage in cases where a detailed transportation network model is unavailable. TRIBUTE is composed of two main parts: a mode choice model and an emissions forecasting model. The mode choice model is responsible for estimating modal shares of alternative modes of travel in response to changes in personal, modal, and land use attributes. The emissions forecasting model translates the modal shares into vehicle kilometers traveled, and subsequently GHG emissions. TRIBUTE is a macroscopic model intended to assist municipalities evaluate alternative transportation and land use policy scenarios and eventually select the one(s) that help them meet their future GHG emission targets. This paper reports on the conceptual framework of the developed model and presents a case study.     

Introducing a transport carbon dioxide emissions vulnerability index for the Greater Dublin Area

Energy consumption and carbon dioxide emissions from the transport sector have continued to rise, adding to growing concerns about the environmental impacts caused by transport systems and related land-use patterns. The transport sector in Ireland is a significant fuel consumer, accounting for 36% (5771 kTOE3) of Ireland’s primary energy demand in 2007. The sector was responsible for 36% (17,014 kt5 CO₂) of Ireland’s energy-related CO₂ emissions, higher than any other sector. Energy use in the transport sector grew by 181% (6.3% per annum on average) between 1990 and 2007. A key characteristic that distinguishes energy use in transport is the almost total dependence on imported oil as a fuel – over 99%, EPA (2009).Given the levels and growth of energy demand in transport, there is a clear imperative for policymakers to develop and implement measures and programmes that maximise energy efficiency and renewable-energy penetration. In this paper we develop a transport carbon dioxide emissions vulnerability index, using the Census of Population of Ireland 2006 Place of Work – Census of Anonymised Records (POWCAR) Dataset. The transport carbon dioxide emissions vulnerability index will be developed for the Greater Dublin Area to represent spatially in terms of transport carbon emissions the regional differentiations in commuting distances and modal shares. The results of this research can then be used to assess the transport carbon dioxide emissions of future development plans and therefore allow greater transport sustainability to be achieved through improved design of the location and form of major new development.     

A method to assess the eco-efficiency of a public bus transportation service

Brazilian Public Bus Transportation Service transports over 34.4 million passengers daily using approximately 107,000 urban buses. This service costs millions of dollars annually to the municipality and emits several pollutants to the atmosphere. Therefore, this paper proposes a method to assess the eco-efficiency of a Public Bus Transportation Service. The proposed method was tested in a medium-sized urban region in Brazil. Different scenarios representing changes in the vehicles engines and fuels were tested and analyzed. Six eco-efficiency indicators regarding emissions and fuel consumption were proposed to assess which mix of engines and fuels would bring the greatest eco-efficiency. The results were compared to targets based on Brazilian regulation and showed that the renewal of the fleet is necessary to meet the environmental targets, while also achieving fuel costs reduction.