Study and Application on the Variation Law of the Energy Dissipation Head in Stepped Spillways

臺階式溢洪道消能水頭變化規律研究及應用

JIN WANG ； HAN-SHENG LIU

《台灣水利》 70卷3期 (2022/09) Pp. 64-75

https://doi.org/10.6937/TWC.202209_70(3).0006

摘要

The energy dissipation head of stepped spillway is an important hydraulic parameter, which directly reflects the energy dissipation of the stepped spillway. Dimensional analysis is carried out on the energy dissipation head of the stepped spillway and its influencing factors, and the relative critical water depth, relative position and slope related to the dimensionless energy dissipation head are introduced. Through the hydraulic model tests of stepped spillway under 45 combined conditions with 5 sets of slopes, 3 sets of step heights, and 3 sets of discharge per unit width, the variation law of the dimensionless energy dissipation head along the way and the relationship with the relative critical water depth and slope were systematically analyzed. The results show that the dimensionless energy dissipation head has a good linear relationship along the way, and the linear slope rate k is positively correlated with the slope, and has nothing to do with the relative critical water depth. According to the law to get a more accurate energy dissipation calculation method.

關鍵字

Stepped spillway ； Energy dissipation head ； Dimensionless ； Hydraulics

並列摘要

臺階式溢洪道消能水頭是重要的水力參數，直接反映了臺階式溢洪道的消能情。對臺階式溢洪道的消能水頭及影響因素進行因次分析，引入與無因次消能水頭相關的相對臨界水深、相對位置、坡度。通過對5組坡度，3個臺階高度，3個單寬流量下共45個組合工的臺階式溢洪道水工模型試驗，系統分析無因次消能水頭的沿程變化規律及其與相對臨界水深、坡度的關係。結果表明：無因次消能水頭沿程呈現良好的線性關係，直線斜率與坡度正相關，與相對臨界水深無關。依據這一規律得到更準確的消能率計算方法。

並列關鍵字

臺階式溢洪道 ； 消能水頭 ； 無因次化 ； 水力學

參考文獻

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