頁籤選單縮合
題 名 | 調節池孔口配置之水理特性研究=Hydraulic Characteristic of Orifice Setup on Detention Pond |
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作 者 | 黃宏斌; | 書刊名 | 臺灣水利 |
卷 期 | 46:1=181 1998.03[民87.03] |
頁 次 | 頁53-59 |
分類號 | 443.46 |
關鍵詞 | 水理特性; 調節池; 孔口流; Hydraulic characteristic; Detention pond; Orifice flow; |
語 文 | 中文(Chinese) |
中文摘要 | 影響調節池設計之因子很多,其中,開口配置與流量之關係最為密切。本研究以 射流理論為基礎,配合水槽試驗結果,求得在不同排水孔口徑、個數,以及不同排列方式下 之流量變化,以及流量修正係數。本研究使用三座圓形開孔之滯洪壩從事固定底床坡度之水 槽試驗。試驗項目分單孔(口徑分別為 2.5 公分、4.4 公分,及 7.6 公分三種;流量範圍 為 0.066 × 10 □∼ 4.83 × 10 □ cms )、2.5 公分口徑之多孔水平排列(開孔數為 1 ∼ 8 孔;流量範圍為 0.066 × 10 □∼ 3.78 × 10 □ cms ),4.4 公分及 7.6 公分兩 種口徑之多孔上下交錯排列(開孔數為 1 ∼ 5 孔; 流量範圍為 1.37 × 10 □∼ 22.01 × 10 □ cms )三大項目。 在分析試驗數據之後,得到主要之結果如下: 1. 單孔之流量係數並非為固定值; 會隨相對水頭(水頭高度對孔徑之比值)之增加而遞增 。 2. 水平間隔排列之孔徑大小對修正係數與相對水頭間之關係影響不大, 其平均修正係數值 為 1.19。 3. 上下間隔排列中,7.6 cm 孔徑之排列常可得到一平均 C �搨�; 而 4.4 cm 者則可以得 到修正係數與相對水頭間之關係為負冪次關係。 4. 利用多個小孔徑來取代一大孔徑, 其排除洪水將更有效率,此時所需設計之調節池蓄水 高度將較小,可較節省工程經費。 |
英文摘要 | There were many factors for designing detention pond in which the relationship between opening setup and outflow discharge was most important. This study, based on jet-flow theory and experimental data explored the variety on discharge for different diameters, numbers and setup types of orifice as well as the correcting discharge coefficient. This study conducted flume experiment with three models of detention dam with circular opening and constant slope. The content of tests were single opening which diameters were 2.5, 4.4 and 7.6 cm, respectively, with flow discharge from 0.066×10□ to 4.83×10□ cms; 2.5 cm-diameter multiple opening with horizontal arrangement which opening numbers from 1 to 8 with flow discharge from 0.066×10□ to 3.78×10□ cms, and 4.4 and 7.6 cm-diameter multiple opening with triangular arrangement which opening numbers from 1 to 5 with flow discharge from 1.37×10□ to 22.01×10□ cms. After analyzing experimental data, the principle results were got as following: 1. The discharge coefficient was not a constant which would be increased with increasing relative head which was the ratio of water depth to orifice diameter). 2. In test of multiple opening with horizontal setup, the effect of orifice opening to relationship between modified coefficient and relative head was insignificant so that the averaged modified coefficient was calculated as a constant. 3. In test of multiple opening with alternated setup, the case of 7.6 cm opening could usally get its average modified coefficient while that of 4.4 cm opeining got the negative power relation for modified coefficient and relative head. 4. Using multiple opening to replace with single opening could get more efficiency in draining flood. Moreover, the height of detention pond would be lower and save more money in construction. |
本系統中英文摘要資訊取自各篇刊載內容。