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題 名 | 高效率量測法應用於淨水場明渠流量之推估=An Efficient Method of Discharge Measurement in Open Channel of Water Purification Plant |
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作 者 | 陳彥璋; 張斐章; 楊翰宗; | 書刊名 | 農業工程學報 |
卷 期 | 48:3 2002.09[民91.09] |
頁 次 | 頁1-9 |
分類號 | 445.25 |
關鍵詞 | 流量量測; 熵; 最大流速; 機率分佈; 不確定性; Discharge measurement; Entropy; Maximum velocity; Probability distribution; Uncertainty; |
語 文 | 中文(Chinese) |
中文摘要 | 流量之資訊為自來水事業處管理之重要依據,而自來水事業處之流量量測主要靠大型之流量計推估流量資料,因此流量計需定時校正以確保其準確性。本研究應用高效率量測法於淨水池之水流於渠道進入管路之前,以高效率量測法量測管路之流量,以作為流量計之校正依據。高效率流量量測法主要是利用明渠之平均流速與最大流速為定值之規律以量測流量,而最大流速可由最大流速所在之垂線上測取少數之流速而加以推估。此外最大流速所在之垂線相當穩定,不受時間、流量或水位所影響。因此斷面之平均流速將可由所推估之最大流速與定值推求。此外通水斷面積可藉由水位、最大流速所在垂線之水深或其與水面寬之積推求。因此流量可由斷面之平均流速與斷面之通水面積推求。本研究利用臺北自來水事業處直潭淨水場之流速及水深資料建構高效率流量量測模式,以推求各淨水池之流量。其結果顯示此法可有效率且準確推估淨水場之流量,以供大型流量計校正使用。 |
英文摘要 | 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. |
本系統中英文摘要資訊取自各篇刊載內容。