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Reducing sediment production from forest roads during wet-weather use

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dc.contributor.advisor Skaugset, Arne E
dc.contributor.advisor Pyles, Marvin R
dc.creator Toman, Elizabeth Myers
dc.date.accessioned 2007-10-08T19:33:01Z
dc.date.available 2007-10-08T19:33:01Z
dc.date.issued 2007-10-08T19:33:01Z
dc.identifier.uri http://hdl.handle.net/1957/6647
dc.description Presentation date: 2007-08-03
dc.description Graduation date: 2008
dc.description.abstract Forest roads produce fine sediment with traffic during wet weather. If the forest road is connected to a stream it can be a source of turbidity and fine sediment that may be detrimental to aquatic organisms especially salmonids. The goal of this work was to investigate turbid runoff during wet-weather use from the pavement of forest roads that were designed to reduce sediment production. This research explored the opportunity costs associated with upgrading forest roads for environmental performance, determined a method to design an unbound aggregate pavement to reduce sediment production, and tested alternatives for road pavements that were designed specifically to minimize turbid runoff during wet weather hauling. The opportunity costs associated with restricted timber hauling and harvesting are potentially a resource that could be made available to improve aggregate road surfaces to minimize hauling restrictions during wet-weather. In this study the opportunity costs were 1.7 to 15 percent of the total net revenue for McDonald-Dunn Research Forest. A method of design for the pavement structure for unbound aggregate roads was developed. This "reduced stress" design method designs against subgrade mixing by reducing stresses on the subgrade to allow for strain hardening of the subgrade. The method recommends depths of surface aggregate that are greater than traditional pavement design methods but is an appropriate design method to reduce sediment production from subgrade mixing. Alternative designs of the pavement for unbound aggregate roads influenced the production of sediment, but results were not consistent; the pavement treatments produced different results across different research locations. The results suggest that fine sediment in surface runoff does not originate from the subgrade but rather from the surface aggregate. Road managers that want to minimize the production of sediment from forest roads should be concerned with the unbound aggregate pavement rather than the subgrade. Managers should design the aggregate pavement with consideration to the availability of fine sediment in the aggregate and should design the pavement to resist rut formation. en
dc.format.extent 5743319 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject Forest roads en
dc.subject sediment en
dc.subject.lcsh Forest roads -- Environmental aspects -- Oregon -- McDonald Forest en
dc.subject.lcsh Forest roads -- Environmental aspects -- Oregon -- Paul Dunn Forest en
dc.subject.lcsh Sediment transport -- Oregon -- McDonald Forest en
dc.subject.lcsh Sediment transport -- Oregon -- Paul Dunn Forest en
dc.subject.lcsh Soil erosion -- Oregon -- McDonald Forest en
dc.subject.lcsh Soil erosion -- Oregon -- Paul Dunn Forest en
dc.subject.lcsh Runoff -- Environmental aspects -- Oregon -- McDonald Forest en
dc.subject.lcsh Runoff -- Environmental aspects -- Oregon -- Paul Dunn Forest en
dc.subject.lcsh Roads, Gravel -- Environmental aspects -- Oregon -- McDonald Forest en
dc.subject.lcsh Roads, Gravel -- Environmental aspects -- Oregon -- Paul Dunn Forest en
dc.title Reducing sediment production from forest roads during wet-weather use en
dc.type Thesis en
dc.degree.name Doctor of Philosophy (Ph. D.) in Forest Engineering en
dc.degree.name Doctor of Philosophy (Ph. D.) in Civil Engineering
dc.degree.level Doctoral en
dc.degree.discipline Engineering en
dc.degree.discipline Forestry en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Kliewer, Julie
dc.contributor.committeemember Lundy, James R
dc.contributor.committeemember Hunter-Zaworski, Katharine
dc.contributor.committeemember Wildenschild, Dorthe


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