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Application for Japanese Pipe Hydrophone in TaiwanforEstimating Bedload Discharge
作者：Nan-Huei Chen, Ming-Hong Lu, Yun-Chung Tsang, Yea-Chuan Tsai, Takahiro Itoh and Cheng-Chun Lee, Yi-Jie Tsai;
公佈日期：109 年 04 月 27 日
研討會論文
384
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In Taiwan, about the sediment monitoring method mostly was sampling by man in the past. The monitoring data were concentrate on wash load and suspended load. Method for bed load is few and results in lack of monitoring data. In Japan, the pipe hydrophone developed started in 1992. There were a lot of studies and monitoring station for pipe hydrophone. Base on those research results of Japanese pipe hydrophone, present study came clarify the relationship between sound pressure and momentum to estimate bedload discharge for each components. For clarifying the influence for sediment particle impacting angle, tests are carried out such that the steel ball to hit the pipe hydrophone in air and change the impact angle from 0 to 90 degree. Differences of sound pressure value on different impact angle are evaluated. For clarifying the particle velocity formula using restrict, observed the particle velocity in flow channel, which is analyzed by camera at 240 fps, is compared with the velocity calculated by Ashida-Michiue formula. According to those experiments, following results are obtained: (1) Influences of collision angle from 0 to 90 degree on sound pressure were not so much significant. (2) The measured velocity was faster than the velocity computed by Ashida-Michiue formula in 2~3 times, and (3) Sound pressure for the same particle in different flow situation, the difference of sound pressure value will be under 10 times, though there were some matters to be solved. After variable estimate sediment discharge by the sound pressure and momentum relationship, in this study, the average sound pressure and the modified velocity of particle to estimate particle mass are used and the impulse of hydrophone impacted are applied to estimate sediment discharge. |
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