Graduate Thesis Or Dissertation
 

Hydraulic performance of countersunk culverts in Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/m613n146n

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  • Twenty eight countersunk culverts in Oregon were evaluated to assess current conditions and hydraulic performance. The culverts were also assessed with respect to their stability, particularly when subjected to high flows. In general, the culverts were found to be resistant to erosion and effective at conveying large discharges. Based on study results and reviewed literature, recommendations are given for design of countersunk culverts. Recommendations include countersinking culverts at least 20% of their height and using boulder weirs or bed riprap to stabilize channel bed elevation downstream from culvert outlets. Water velocity within the barrels of selected culverts was examined. Detailed measurement of water velocity distributions in several culverts during fall and winter discharges documented the presence of zones of velocity of a magnitude currently accepted in the literature as passable by juvenile salmonids. A method for predicting the extent of low velocity zones within the flow cross-section, based on commonly used hydraulic parameters such as normal depth, channel slope, and average cross-sectional velocity, was explored. The extent of low velocity zones was under-predicted in most cases. In all cases the relationship between predicted and measured areas of low velocity appeared linear, suggesting that the development of such a method for use in culvert design may be possible.
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Déclaration de droits
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