Hydraulic evaluation of flow transmissibility in patchy concrete open channel
2015
Fujiyama, S. (Sanyu Consultants Inc., Toshima-ku, Tokyo (Japan)) | Taruya, H. | Nakada, T. | Mineta, T. | Ito, Y. | Momii, K.
At present, in facilities management project, the hydraulic function is not diagnosed for patchy concrete open channels that have been repaired sporadically by several repair methods over a short distance. Therefore, it is necessary to clarify the influences of sporadic repairs of a channel on its flow transmissibility. This study aimed to evaluate flow transmissibility in the hydraulic function of patchy concrete open channels based on field surveys and nonequivalent flow analysis. The field surveys resulted in small changes in water level and flow velocity at the center of each repair section in the channel. The nonequivalent flow analysis showed that patchy repairs led to longitudinal fluctuations of water surface by changes in the longitudinal slope of channel bottom, but hardly by changes in the wall roughness and width of the channel. Accordingly, we suggested a new procedure for the diagnosis of the hydraulic function, i.e. flow transmissibility, in patchy concrete open channels. In this procedure, we proposed three factors-roughness, bottom slope, and width of the channel-as diagnosis indicators, and moreover did the way of field investigations to examine the three factors.
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