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原文传递 Improvement of Michigan Climatic Files in Pavement ME Design.

题名：	Improvement of Michigan Climatic Files in Pavement ME Design.
作者：	You, Z.; Yang, X.; Hiller, J.; Watkins, D.; Dong, J.
关键词：	Climatic files, Pavement designs, Quanitity, Quality checks, Sensitivity, Climate zones, MICHIGAN (STATE), Weather stations, Climatic variables, Road condition, Road Weather Information System (RWIS)
摘要：	Climatic inputs have a great influence on Mechanistic-Empirical design results of flexible and rigid pavements. Currently the state of Michigan has 24 climatic files embedded in Pavement ME Design (PMED), but several limitations have been identified. First, five of the climatic files cannot be directly utilized because of an entire month of missing data. These missing data should be filled properly. Second, the 24 weather stations in Michigan are not uniformly distributed geographically, with some regions poorly represented. It is desirable to add new weather stations for these gap regions. Third, existing climatic files for Michigan have not been updated since 2006. A longer climatic data length can better represent the long-term climatic conditions, so it is recommended that the data length of existing climatic files be extended. This study aims to improve the climatic files in Michigan for PMED. To achieve this goal, quantity and quality checks of the existing 24 climatic files were conducted to find out the potential missing data and erroneous data. Procedures for filling the missing data and correcting the erroneous data were proposed as well. The sensitivity of PMED design performance to weather station variation in Michigan, the five individual climatic variables, and the depth to ground water table was investigated. Two traffic levels (heavy and medium) and two pavement types (flexible and rigid) were used for the sensitivity analysis. Typical traffic load spectra, pavement structures and materials in Michigan were incorporated as well. Additional weather data from the Automated Surface Observation Systems (ASOS) and Michigan Road Weather Information System (RWIS) were investigated as potential sources to add new weather stations in gap regions and to extend the existing climatic files. Quantity and quality checks on both data sources were conducted to evaluate the feasibility of application in PMED. It was found the ASOS data and the existing climatic data are from the same historical data records. Fifteen additional weather stations were added to fill the gap regions using the ASOS data. In addition, all the existing climatic files have been extended from Feb. 2006 to Dec. 2014. Finally, climatic zones based on pavement design results and multiple climatic variables for Michigan were preliminarily investigated. Fifteen climate zones were established for Michigan based on pavement surface temperatures and distress predictions.
总页数：	You, Z.; Yang, X.; Hiller, J.; Watkins, D.; Dong, J.
报告类型：	科技报告