主题:Some Unintended Impacts of Green Logistics
Policies in Urban Areas
主讲人: Professor Samer Madanat
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:36365线路检测中心no1
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