TEMPORAL DISAGGREGATION OF TRAVEL DEMAND FOR HIGH RESOLUTION EMISSIONS INVENTORIES

The commonly used photochemical air quality model, the Urban Airshed Model (UAM), requires emission estimates with grid-based, hourly resolution. In contrast, travel demand models, used to simulate the travel activity model inputs for the transportation-related emissions estimation, typically only provide traffic volumes for a specific travel period (eg the am and pm peak periods). A few transportation agencies have developed procedures to allocate period-based travel demand data into hourly emission inventories for regional grid cells. Because there was no theoretical framework for disaggregating period-based volumes to hourly volumes, application of these procedures frequently relied upon a single hypothetical hourly distribution of travel volumes. This study presents a new theoretical modeling framework that integrates traffic count data and travel demand model link volume estimates to derive intra-period hourly volume estimates by trip purpose. The authors propose a new interpretation of the model coefficients and define hourly allocation factors by trip purpose. These allocation factors can be used to disaggregate the travel demand model 'period-based' simulation volumes into hourly resolution, thereby improving grid-based, hourly emission estimates in the UAM. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13619209
• Corporate Authors:

  Elsevier

  The Boulevard, Langford Lane
  Kidlington, Oxford  United Kingdom  OX5 1GB
• Authors:
  • LIN, K-S
  • Niemeier, D A
• Publication Date: 1998-11

Language

• English

Media Info

• Features: References;
• Pagination: p. 375-87
• Serial:
  • Transportation Research Part D: Transport and Environment
  • Volume: 3D
  • Issue Number: 6
  • Publisher: Elsevier
  • ISSN: 1361-9209
  • Serial URL: http://www.sciencedirect.com/science/journal/13619209

Subject/Index Terms

• TRT Terms: Air pollution; Demand; Hours; Mathematical models; Pollutants
• Geographic Terms: United States
• ITRD Terms: 2452: Air pollution; 285: Demand (econ); 2442: Emission; 9030: Hour; 6473: Mathematical model; 8122: USA
• Subject Areas: Environment;

Filing Info

• Accession Number: 00758463
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, ATRI
• Created Date: Jan 25 1999 12:00AM