Honors College Thesis
 

Streambed scour and redeposition behavior in streambed simulated culverts over an annual period

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https://ir.library.oregonstate.edu/concern/honors_college_theses/tt44pp59q

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  • The objective of this study was to provide first order observations of bed level changes occurring in streambed simulated culverts throughout an annual period. To accomplish this, 30 culvert sites were selected in Oregon and Washington, and monitored over, at least, a 2 year period. Streambed scour and redeposition data was collected through scour chains, installed at the inlet and outlet of each culvert. Site characteristics including culvert dimensions, slope, bed material, and installation year were recorded, and the peak instantaneous discharge was estimated for each site. The peak flow was also related to recurrence intervals to normalize the magnitude of the events seen across the study sites. The results indicated no strong correlations between the bed level changes observed and the site characteristics measured, alluding to the complexity of these systems. Hjulström’s Diagram however provided some context for the scour results seen, by comparing whether scour was predicted at that site based on the summer bed level and instantaneous peak velocity. Overall, this study’s results indicated that streambed levels can change drastically throughout the year despite similar summertime bed levels, and brings into question the current methods of determining the success of these dynamic systems. Key Words: Streambed Simulated Culverts, Scour Chains, Streambed Scour, Streambed Redeposition, Oregon, Washington, Forest Roads, Forestry, Hydrology
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