| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 106 === The concrete model of the concrete in this study was modeled by staggered arrangement. In order to obtain the Manning coefficient of the test model, and then to estimate the Manning coefficient value of the prototype. The result is compared with the Manning coefficient value of the previous model in a regular arrangement, discuss whether it is possible to improve the effectiveness of the energy dissipation loop to reduce the flow rate under cost saving.
According to the experimental results, when the height of the energy dissipation pier is the highest and the arrangement is tight, the Manning coefficient value is the largest. In this experiment, when the energy dissipation pier is 5 cm in height and 3 cm in pitch, the Manning coefficient is the largest. Its Manning n value also has different results depending on the spacing.
From the experiment, the water depth and the n value of the Manning coefficient are discussed. It is found that when the ratio of the water depth to the average height of the pier is increased, the Manning coefficient value will gradually become constant. That is, the immersion condition occurs in the water depth of this design. The ratio of the water depth to the average protruding height of the pier is inversely proportional to the Manning coefficient value. When the ratio of the water depth to the average protruding height of the pier is greater than 6, the energy dissipation effect of the pier is gradually stabilized. Therefore, the results of this experiment can be used as a reference for designing the energy dissipation pier in the channel.
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