Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33530
標題: 滯洪壩下游逆坡元鼎塊消能之試驗研究
A Study on the Energy Dissipation of Adverse Slope Hexa-Hollow Tri-Leg Structure of Flood Detention Dam
作者: 高玉玲
Kuo, Yu-Ling
關鍵字: 逆坡
Adverse
元鼎塊
滯洪壩
Hexa-Hollow Tri-Leg Structure
Flood-Detention Dam
出版社: 水土保持學類
摘要: 本試驗以自然沖刷坑形狀為設計依據,於開口式滯洪壩下游鋪設順坡 、水平及三種逆坡角度(-3.49%、-6.99%、-10.51% )之元鼎塊護坦,在 三種滯洪壩開口寬度、四種渠糟坡度及四種流量下,以清水流況進行水工 試驗,探討護坦下游之沖刷及消能之情形。 經由試驗結果得知,護坦 之消能效率以逆坡鋪設最佳,水平次之,順坡最差,且消能效率隨元鼎塊 護坦逆坡角度、流量及渠糟坡度增加而增加,而隨矩形開口寬度之增加而 減少。而在開口寬度4.0cm 時,以元鼎塊逆坡 10.51% 消能效率最佳;開 口寬度4.5cm及5.0cm 時,渠坡4.5% 及 5.56% 之最佳逆坡角為 -6.99% ,渠坡6.56% 及7.56% 時,仍以逆坡 10.51% 最佳。 根據此試驗結果 ,與防砂壩下游逆坡排列元鼎塊護坦比較後發現,在相同的流量及渠槽坡 度下,滯洪壩下游逆坡元鼎塊之最佳逆坡角度較大,故防砂壩下游之保護 措施應用於滯洪壩下游時,需針對滯洪壩之矩形開口及扇形水流多作考量 。
This study accords with the natural scouring hole of detention damand uses the hexa-hollow tri-leg structure to form adverse-slope apron.With declining, horizontal and different adverse slopes, the energydissipation and scouring phenomenon are discussed under thenonsediment flow with defferent combination bed slopes, discharges,and widths of rectangular opening. According to the result of the experiment, the energy dissipationeffectiveness will increase with increasing bed slope, discharge and the angle of adverse slope, but decrease with decreasing width of therectangular opening. Under these experimental conditions, the mosteffective adverse-slope angle is 10.51% when the opening width is 4.0cm.When the opening width is 4.5cm or 5.0cm, the most effective adverse- slope angle is 6.99% for bed slopes of 4.5% and 5.56% and 10.51% for bed slopes of 6.56% and 7.56%. Comparing the result of this experiment with that of adverse slopehexa-hollow tri-leg structure of check dam, we can find that, with thesame bed slope and discharge, the most effective adverse-slope angle ofthe adverse-slope apron with detention dam is larger than that for checkdam. Therefore, it is necessary to consider the effects of rectangularopening and semi-cone-like flow of a detention dam when placing thecheck dam apron for detention dam.
URI: http://hdl.handle.net/11455/33530
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