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环青海湖公路在历次的修建、改建及养护中,由于多方的原因,公路建设后遗留在公路两侧未恢复的大量取土坑及弃土堆对沿线景观造成了一定的影响.就环青海湖公路沿线环保整治工程实施的过程及其实施后产生的生态效果进行了阐述.对今后的公路建设和此类工程的施工等有着较多的借鉴意义. 相似文献
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公路建设对路域生态系统造成了负面影响,景观生态重建是实现速公路建设可持续发展的重要途径之一。在对公路景观生态重建现状分析的基础上,文章立足中国国情,借鉴国外公路、矿区景观生态重建的经验,结合可持续发展的原则,论述了公路景观生态重建目标、原则、措施和程序,并提出了重建效果评价的标准。力求为国内公路的景观生态重建提供指导。 相似文献
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青藏公路茶卡至诺木洪段路域生态环境现状研究 总被引:1,自引:0,他引:1
为评估青藏公路建设对公路沿线生态环境的影响程度,借助遥感(RS)与地理信息系统(GIS),对青藏公路茶卡至诺木洪段公路两侧300m范围内的土壤类型、植被情况、野生动物分布、土地利用情况和土壤侵蚀情况进行调查和研究。结果表明,公路沿线区域河流数量很少,水热条件差,植被自我恢复能力较弱,植被覆盖度中等,荒漠化严重,生物多样性为一般水平。 相似文献
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本文针对天山公路沿线的生态环境特点,综合分析了公路改扩建对生态环境造成的影响,运用生态恢复的理念,根据边坡所属的不同地貌类型和不同的地质条件,对公路沿线的气候特征、植被状况、土壤情况进行详细分析的基础上,对天山公路沿线的边坡和取弃土场,因地制宜的采取相适应的恢复措施进行了方法和理论探讨。 相似文献
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文章结合扎墨简易公路便道整修工程实践,介绍了扎墨公路沿线地质的工程特性、分类以及该路线上的公路病害情况,提出了相应的病害处治措施及在扎墨公路沿线区域进行公路工程施工应注意的问题。 相似文献
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Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD). An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip. It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links. 相似文献
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Joseph N. Prashker 《Transportation》1979,8(4):329-346
Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area. 相似文献
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This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress. 相似文献
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本文阐述了混合动力列车的技术特点及其相应优势与劣势,同时介绍了其在国内外的研究动向,并对其应用前景进行了展望。尽管该类新型铁道车辆的续航能力、电池寿命以及成本等相关问题目前仍有待改善,但以其对城市环境的美化作用与优越的舒适驾乘性能,以及高效节能、绿色环保的显著优势,依然不失为一类充满前景的新型轨道交通运输方式。 相似文献
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天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本. 相似文献
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介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。 相似文献