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- W2891619457 abstract "Multi-plane stereoscopic PIV measurements were performed in an open-channel flume fitted with cubes to investigate very low submergence ratios, h/k={1.5,2,3}, where h is the water depth and k the roughness height. The spatial standard deviation of the mean flow components reveals that the extent of the roughness sublayer increases drastically with the decrease in h/k to span the entire water column for the lowest h/k investigated. Despite this, the logarithmic law is still observed on the double-averaged velocity profiles for all h/k, first with a fixed von Kármán constant κ and, second, via the indicator function where κ is a free parameter. Also, the longitudinal and vertical normal stresses indicate a universal boundary layer behaviour independent of h/k. The results suggest that the logarithmic and wake-defect laws can still be applied at such low h/k. However, the lateral normal stress depends on h/k in the range investigated as well as on the geometry of the roughness pattern." @default.
- W2891619457 created "2018-09-27" @default.
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- W2891619457 date "2018-09-11" @default.
- W2891619457 modified "2023-10-15" @default.
- W2891619457 title "Low relative-submergence effects in a rough-bed open-channel flow" @default.
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- W2891619457 doi "https://doi.org/10.1080/00221686.2018.1478894" @default.
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