Potential hazard analysis from the viewpoint of flow measurement in large open-channel junctions |
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Authors: | Yang Han-Chung Chen Cheng-Wu |
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Institution: | (1) Department of Leisure, Recreation and Tourism Management, Shu-Te University, No.59, Hengshan Rd., Yanchao, Kaohsiung, 82445, Taiwan;(2) Institute of Maritime Information and Technology, National Kaohsiung Marine University, Kaohsiung, 80543, Taiwan;(3) Global Earth Observation and Data Analysis Center, National Cheng Kung University, Tainan, 701, Taiwan, R.O.C.; |
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Abstract: | A robust and reliable risk assessment procedure for hydrological hazards deserves attention. The transport of mixed material
in the types of hazard, such as flash floods and debris flows, plays an important role and should be taken into consideration.
At present, however, the mixed material transport phenomenon is not systematically and simply included in the procedures for
the elaboration of hazard analysis. The consequence is the risk of losing prediction accuracy and of underestimating hazard
impacts. The phenomenon of open-channel junction flow such as in irrigation ditches and at wastewater treatment facilities
is an important aspect of hydrological engineering. Extensive experimental studies of the flow characteristics have been conducted.
In this study, an Acoustic Doppler Velocimeter is used to monitor the flow in large open-channel junctions at the Chihtan
purification plant in Taipei. The condition of the experiment is made up of different discharge. The result of the measurement
data shows that the mean velocity profile, aspect ratio, measured vertical line location and the ratio of the distance of
the vertical line maximum velocity from the bed to water depth. An artificial neural network (ANN) is used to simulate the
mean velocity profiles in this study. The results show that the ANN can accurately and reliably simulate the mean velocity
profiles. The result is believed to provide hints for the consideration of the effects, induced by mixed material transport,
in the elaboration of hazard analysis. |
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