Erosion control for highway applications : phase I, review and synthesis of literature.
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2002-05-01
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Alternative Title:Phase I, review and synthesis of literature
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Edition:Final report.
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Abstract:The project described herein has led to a convenient, computer-based expert system for ; identifying and evaluating potentially effective erosion- and sedimentation-control ; measures for use in roadway construction throughout Iowa and elsewhere in the Midwest. ; The expert system is intended to be an accessible and efficient practical resource to aid ; state, county, and municipal engineers in the selection of the best management practices ; for preventing unwanted erosion and sedimentation at roadway construction sites, during ; and after construction. ; The expert system is based on a comprehensive review of the literature on erosion and ; sedimentation control methods (ESCMs). The literature includes diverse in-house ; manuals, information on state-DOT websites, as well as an array of publications from ; various agencies (state, and federal government) and industry, design manuals, federal ; and national guidelines, and specialized computer programs. In addition, surveys of state ; DOTs within the U.S. Great Plains and Upper & Middle Mississippi Valley Regions, and ; of Iowa County engineers were conducted. The literature review and the surveys led to ; the expert system, which comprises a structured synthesis of information on ESCMs. It ; provides information on the principal technical, implementation, economic, and ; operational efficiency considerations. ; A notable finding of the literature review and the state DOTs survey is the identification ; of numerous in-house manuals developed by the various agencies directly involved with ; mitigating erosion and sedimentation concerns. The manuals are mainly in hardcopy ; format, though some are in an electronic format. The literature review and survey ; revealed that, although extensive ESCM literature exists, much of it is not organized to ; enable effective use by highway engineers. This finding motivated the project ; investigators to initiate and develop a contemporary, computer-based expert system. ; The expert system is a comprehensive “inference engine” that will assist state, county, ; and municipal engineers in the selection, design, construction, inspection, and ; maintenance of ESCMs for a particular roadway construction situation. The expert ; system was designed to ensure that selected ESCMs take into account site characteristics, ; the lifetime of the planned method, and Iowa’s Midwest environment. The expert system ; can be further developed by refining its database content and by adapting the current ; inference engine for web-based environment. Those further steps were beyond this first ; phase of the Project. ; The project also led to a significant shortlist of ESCM research needs. Among them is ; the need to better take into account the impacts on ESCMs of frigid winter conditions. In ; this regard, a common concern is the establishment of protective vegetation to mitigate ; erosion and sedimentation concerns at roadway construction sites.
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