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研究生:謝清宗
研究生(外文):Ching-Chung Hsieh
論文名稱:攔砂堰跌水沖刷之實驗分析
指導教授:周憲德
指導教授(外文):Hsien-Ter Chou
學位類別:碩士
校院名稱:國立中央大學
系所名稱:土木工程研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:120
中文關鍵詞:自由沖射流沖刷深度沖刷參數
外文關鍵詞:Free jetScouring depthScouring parameter
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堰壩下游河床局部沖刷之形成,源於堰壩頂溢流水舌形成自由沖射流,擾亂並起動底床泥沙顆粒,再由縱向水流沖刷推移至下游區域,而沖刷坑之發生及發展可能影響到堰壩本身的安全。本研究自堰壩下游局部沖刷之機制出發,採用巴金漢-π理論來推估渠床面沖刷坑深度達穩定時,其相對沖刷深度之變化規律。推估結果顯示,最大沖刷深度受沖刷參數所影響,即:
式中 為沖刷平衡時之最大動沖刷深度;F0為密差福祿數;Yt為尾水深;b0為射流厚度;Yc為臨界水深。檢視該方程式可知,在同一流況下,當尾水深較深時其最大沖刷深度較淺,再由實驗資料驗證發現,最大沖刷深度與尾水深關係也是成反比關係,理論與實驗資料之驗證均能顯示上述物理特性,所以更驗證了本研究之推論與可用性。
The local scour in the channel bed below a weir or a check dam is caused by the plunging jet of free fall nappe from the crest. The turbulence therefrom disturbs and moves the sediment partical downstream. The formation and development of the scour hole can be influenced on the stability of the hydraulic structures. This study is focused upon the mechanism about the scour by using the Buckingham π-method, the evolution of the relative scour depth and therminal state of the relative scour depth under asymptotic condition. The inference shows that the maximum scour depth is influenced by the erosion parameter Ep, i.e.,
We can know that to view the scour equation. Under the same flow condition, the deep tailwater depth makes the shallower scour depth. It also can be found from the data of the experiment, the maximum scour depth is inversely proportionate to the tailwater depth. Both of the theory and the experiment can also show above mentions that the physical characters, so they were able to vertify the proposed relation and usability.
第一章導論1
1.1緒論 1
1.2文獻回顧2
1.3研究目的28
1.4本文架構28
第二章理論分析30
2.1 沖刷機制30
2.2 邊壁射流沖刷二維特性31
2.3 邊壁射流沖刷三維特性33
2.4 邊壁射流擴散特性37
第三章實驗配置與方法39
3.1實驗配置39
3.2流量率定與儀器率定39
3.2.1流量率定39
3.2.2聲波都普勒流速儀(ADV)率定40
3.3實驗條件40
3.4實驗方法41
3.4.1水深量測41
3.4.2沖刷深度及位置的量測42
3.4.3沖刷坑剖面演變的量測42
3.4.4沿射流中心線速度及沖刷坑內渦漩頻率之量測42
第四章實驗結果與討論44
4.1 沖刷坑之演變44
4.2 沖刷坑之相似剖面…………………………………………….47
4.3 沖刷型態48
4.4 沖刷前後之粒徑分佈比較50
4.5 沖刷坑特徵尺度與沖刷參數的關係51
4.6 沖刷坑內之甲護效應54
4.7 沖刷坑內流速頻譜分析56
第五章結論與建議57
5.1 結論57
5.2 建議58
參考文獻60
附圖……………………………………………………………………..73
附錄.116
中文參考文獻
1. 陳正炎、李華寧,「堰壩投潭局部沖刷試驗研究」,台灣水利,第33卷第4期,第31∼38頁(1985)。
2. 陳正炎,「投潭水作用下渠床沖刷剖面之研究」,台灣水利,第35卷第1期,第35∼53頁(1987)。
3. 葉昭憲,「系列防砂壩之沖淤試驗與初步規劃」,國立中興大學水土保持研究所碩士論文(1988)。
4. 吳金洲,「堰壩溢流水舌對下游河床沖刷之研究」,逢甲大學土木及水利工程研究所碩士論文(1990)。
5. 蘇重光、連惠邦、楊書昌,「沖射流理論應用於堰壩下游局部沖刷之研究」,流域暴雨逕流經理研討會論文集,第211∼228頁(1991)。
6. 蘇重光、連惠邦,「防砂壩下游天然河床受壩頂溢流沖刷之研究」,台灣水利,第41卷第2期,第35∼41頁(1993)。
7. 林聰悟,「快速傅立葉轉換在動力分析上之應用及計算原理」,結構 工程,第三卷第四期,第3∼12頁(1988)。
英文參考文獻
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19.Hartung, F., and Haustler, F. “Scours, Stilling Basins and Downstream Protection under Free Jets”, Transactions of the 11th International Congress on Large Dams, Vol. Ⅱ, Question 41, Reply 3, Madrid, Spain, June, pp.39-56, (1973).
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22.Kobus,H., Leister,P. and Westrich,B.,“Flow field and scouring effects 0f steady and pulsating jets impinging on a movable bed”,J. of Hydr-aulic Research,No.3,pp.175-192, (1979).
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26.Mason,P.J. and Arumugam,K.,“Free jet scour below dams and flip buckets”,J. of Hydraul Engineering,ASCE,Vol.111,No.2, pp.220-235,(1985).
27. Mason,P.J.,“Effects of air entrainment on plunge pool scour”, J. of Hydraulic Engineering 115(3), pp385-399;117(2), pp.256-265, (1989).
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