主讲人简介

Dr. Madanat is Xenel Professor and the director of the Institute of Transportation Studies in the Department of Civil and Environmental Engineering, at the University of California, Berkeley. He received his Ph.D. from MIT in 1991. He is the Editor in Chief of the ASCE Journal of Infrastructure Systems. Dr. Madanat’s research interests are in the area of civil infra-structure systems management, with emphasis on the utilization of analytical methods in mod-eling facility performance and optimizing life-cycle management decisions. His research has been published in Transportation Science, Transportation Research, Journal of Infrastructure Systems, Journal of Transportation Engineering, Computer-Aided Civil and Infrastructure En-gineering and Transportation Research Record.  

主讲内容

In recent years, various “green” logistics policies have been deployed to reduce the negative externalities of freight transportation. Such policies have often been justified by studies which conclude beneficial environmental impacts. However these studies have often been incomplete, leaving significant questions about the direction that policies should take in the future. Two policies are found to be pervasive in implementations around the world. Those aimed at reducing the number of road freight trips through an increase in loads and those aimed at lowering the number of peak-hour truck trips.

Heavy freight vehicles cause most of the dam-age incurred by pavements. The supply chain associated with pavement maintenance and construction releases significant pollutant emissions, raising the question of whether increased vehicle weights may cause unintended environmental consequences. We present case examples with estimated emissions resulting from shifts in load consolidation and in-creased maximum weight. These examples indicate that increased load factors in freight movement can cause significant increases in emissions of certain pollutants.

The atmospheric boundary layer is generally more stable during the night than the day. Consequently, shifting logistics operations to the night may increase the 24-hour average concentrations of diesel exhaust pollutants in many locations. We pre-sent case examples of this phenomenon, which provide concentration estimates after temporal redistributions of daily logistics operations. Congestion is considered through examples that show the effects on traffic speeds of shifting vehicle trips and the subsequent effect on emissions factors and pollutant concentrations. A new tool is presented, which can be used to assess whether an off-peak policy would be damaging in different contexts. This tool is used to depict various regimes in which unintended envi-ronmental impacts can occur.

时间: 2011年6月1日

地点：交通运输工程学院

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