Vol II, Issue 8 August 2006

NaSS Design Document Updated in Response to Peer Review; Published as NETS Report
The NaSS team recently completed their responses to comments made by the Design Document Independent Peer Reviewers. An updated Design Document, which contains modifications in response to the Independent Peer Review, has been published as the newest NETS report. Both the updated Design Document and Peer Review Comments and Responses are now available on the NETS web site.

Fact Sheet

NETS Researchers Forecasted to be Published in Journal of Transport and Economic Policy
Mark Thoma, PhD, and Wesley Wilson, PhD, of the University of Oregon and the NETS program, have had their paper "Market Adjustments over Transportation Networks: A Time Series Analysis of Grain Movements on the Mississippi Inland Waterway System" accepted for publication in the May 2007 issue of Journal of Transport and Economic Policy.

Transportation occurs over a network and involves a multitude of different origins, destinations, and modes which complicates the estimation of structural models.  Yet, an understanding of the type and level of market adjustments among key transportation statistics is central to analyzing the effects of policy and to forecasting.  Time-series techniques are used to characterize the relationship between key transportation statistics e.g., movements on a waterway and shocks to barge rates.  Generally, the results suggest that the approach is useful in uncovering complicated relationships over networks and that it is well suited to short-run forecasting.

Fact Sheet | Report | Report Appendices

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Researchers Design New Towing Carriage
Researchers at the U.S. Naval Academy are designing a towing carriage to be fitted to the existing ESTEX (Estuarine Experimental) facility located at the Engineer Research and Development Center (ERDC) Coastal and Hydraulic Laboratory in Vicksburg, MS. The towing carriage is being designed to tow large-scale physical deep-draft vessel models maneuvering through non-distorted, scaled engineered channels. This work and capability is to support the Vessel Motion in Confined Waterways/ Enhancements to ERDC-WES Channel Analysis and Design Evaluation Tool (CADET) work unit of NETS.

Once installed, the carriage will be used to experimentally test the behavior of physical model vessels within varying model channel configurations and at varying speeds. Data and information collected from this new and unique capability will be analyzed to refine engineering guidance for waterway design, economic analysis, and algorithms for virtual simulation of vessel operations.

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