Spring Thaw Predictor and Development of Real Time Spring Load Restrictions

In the fall of 2006, the State of New Hampshire Department of Transportation (NHDOT) began a two - year study to develop a Real Time Spring Load Restriction Methodology. The methodology is intended to guide the Maintenance Districts in their management of spring load restrictions by identifying the beginning and duration of spring thaw. Two methods will be used to determine how long load restrictions will be needed after the date of actual thaw: frost tube readings and computer model forecasting. A total of nine sites in the central part of the state were instrumented with frost tubes, water wells, subsurface temperature and moisture sensors, and weather stations. Falling Weight Deflectometer (FWD) tests were conducted at those sites from January 2008 through June 2008 with an additional test in August 2008 and another in October 2008. The U.S. Forest Service is continuing its work with the current developer of the Enhanced Integrated Climatic Model (EICM), which is embedded in the Mechanistic Pavement Design Procedure (MEPDG). It is proposed to use the EICM (isolated from the MEPDG) with the 7–10 day forecast temperatures to predict thaw. This paper describes the overall project, data collected to date, and preliminary results.


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Maps; References; Tables;
  • Pagination: pp 551-561
  • Monograph Title: Cold Regions Engineering 2009. Cold Regions Impact on Research, Design and Construction

Subject/Index Terms

Filing Info

  • Accession Number: 01144313
  • Record Type: Publication
  • ISBN: 9780784410721
  • Files: TRIS
  • Created Date: Nov 17 2009 12:32PM