An Efficient Method of Discharge Measurement in Open Channel of Water Purification Plant
Resource
農業工程學報 48 (3): 1-9
Journal
農業工程學報
Journal Issue
3
Pages
1-9
Date Issued
2002-09
Date
2002-09
Author(s)
Abstract
Discharge is among the most important information necessary for the management of the water purification plant. To accurately measure discharge, the flowmeters have to be calibrated regularly. An efficient method presented herein is used to estimate discharge quickly and accurately. The data of discharge is devoted to calibrate the coefficients of the flowmeters. An efficient method bases on the regularity in open-channel flows that the nature maintains a constant ratio of mean to maximum velocities at a given channel section by adjusting the velocity distribution and the channel geometry. The maximum velocity at a given section can be easily determined on a single vertical, which tends to remain invariant with time and discharge, and can be converted to the mean velocity of the entire cross section by timing the constant ratio. The channel cross-sectional area can be determined from the gage height, the water depth at the y-axis or the product of the channel width multiplied by the water depth at the y-axis. Then the most commonly used method, the velocity-area principle, which determines discharge as the product of the cross-sectional area timing mean velocity is applied to estimated the discharge. The available data of the Chihtan Water Purification Plant is used to illustrate the accuracy and reliability of the proposed method. The results show that it can efficiently and accurately estimate discharge for the calibration of the flowmeters.
Subjects
Discharge measurement
Entropy
Maximum velocity
Probability distribution
Uncertainty
Type
journal article
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高效率量測法應用於淨水場明渠流量之推估.pdf
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