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Application of Acoustic Doppler Current Profiler to Discharge Measurement in Rivers
|關鍵字:||Acoustic Doppler Current Profiler|
|摘要:||中 文 摘 要
而此等水文 資料又為河川治理與水資源規劃、設計之重要依據。 因此，
本研究引進高精密度之聲波 杜普勒剖面測速儀，並配合邱氏 ( Chiu )以
究嘗試於拖曳水槽中， 利用相對運動原理與台車速度作杜普 勒剖面測速
外， 其餘準確度甚佳 。另外佐以分析美國科羅拉多大學動床水槽實驗之
Abstract In general, rivers are steep and rapid in Taiwan. It is hard to measure the flow discharges during the medium and high flow stages.These data, however , are very important for the regulation of rivers and the water resources planning. To overcome the problem, this research used an acoustic doppler profiler ( ADP ) and Chiu's discharge theorem to more efficiently measure the medium and high flows. Both ADP and ADCP ( accoustic doppler current profiler) were calibrated in a tow tank based on the concept of relative motion. In addition, ADP were installed in a 300-pound lead fish and used to measured the flow discharges inthree rivers in the central region of Taiwan. The results of the tests indicated that the new equipment were fairly accurate except the regions near the channel bottom and the water surface due to the " side-lobe " effect and the limitation of " blanking distance ", respectively. In order to check the applicability of Chiu's discharge theorem, a set of alluvial channel data collected at Colorado State University were analyzed. It was found that the ratio of the cross-sectional average velocity to maximum velocity were relatively stable for wholly turbulent flow with rough bed, and it decreased slightly with an increase of the channel roughness. For the Chien-Fong and Nan-Pei Tong hydrological stations, both the ratio of and Y-axis ( the vertical passing through the maximum velocity of the cross section ) were reasonably stable. With application of both the Chiu's discharge theorem and the ADP, these two stations can be considered as an automatic hydrologic stations for discharge measurement in the future. As regareds Tong-Tou hydrological station, both the ratio of and the Y-axis varied with flow stage during the low flow, and additional data for medium and high flow need to be collected for further anysis in the future.
|Appears in Collections:||土木工程學系所|
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