Developing Accurate Ports Emissions Inventories
Research Idea Scope
TxDOT; Develop Emissions, Truck Trips and Railcars Estimation Methodology for Major Texas Ports (Research Underway)
As with the growing domestic and foreign trade, port-related traffic and activities have been steadily increasing and this trend will continue in the future. An inventory of port emissions is a crucial step for a region to comply with the State Implementation Plan (SIP) required by the Clean Air Act (CAA). Port related emissions mainly come from mobile sources categorized as sea-side marine vessels and land-side trains and trucks. The Texas Department of Transportation (TxDOT) is interested in a systematic analysis and forecast of spatial and temporal patterns of port related traffic to improve the estimations of traffic characteristics and emission levels on roadways around ports in nonattainment areas. This project will review existing methods in literature and select appropriate procedures to estimate various sources of port emissions. The emissions from marine vessels can be examined by following EPA’s emission inventory guideline and that of non-road port engines and equipments can be computed using EPA’s NONROAD model. This study will emphasize the analysis of port-related traffic and their associated mobile source emissions. A complementary approach of commodity-based and vehicle-based methods will be employed to measure the truck and rail traffic flows from and to ports. The number of trucks and railcars in and out of the port is associated with vessel loading and unloading. The vehicle miles traveled (VMT) of port-related truck traffic together with idling, age, and other truck characteristics will be utilized to estimate the emissions from port-related trucks. Railcar emissions are developed from fuel consumptions for linehaul locomotives and switch yard locomotives. A spreadsheet-based package will be developed to calculate port-related truck trips, rail cars, and emissions. The models in the package will be validated and evaluated in an empirical study on the Port of Houston. They will be
further implemented and tested in a case study on the Port of Beaumont.