Investigation by hydraulic model experiment on recovery of flow transmissibility in partial repaired patchwork-like channel
2018
Nakada, T. | Namihira, A. | Taruya, H.
Hydraulic model experiments and non-uniform flow analysis were conducted to clarify the influence of the decrease of roughness coefficient on the water surface profiles and energy loss according to the installation pattern of the repair section, assuming the intermittent repaired channel. Regardless of the length of repaired sections nor frequency of switching repaired/non-repaired sections, local loss of energy did not occur in the boundary of the both sections, and it was found that the water surface profiles can be calculated accurately by conventional non-uniform flow analysis. To avoid flooding, it is necessary to determine the total repair length required for water surface recovery by conducting a hydraulic analysis beforehand. In designing and constructing a repaired channel, it is effective to repair preferentially the part with severe deterioration from the downstream side of the overflow point.
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