Title: Analysis of hydraulic characteristics of flow spring at stepped spillway
Abstract: 【Objective】 The research is to study the hydraulic characteristics of flow spring caused during the overflow at the stepped spillway.【Method】 The model test and dimensional analysis are adopted to study the hydraulic characteristics of flow spring at the stepped spillway.【Result】 The phenomena of flow spring takes place at a large range of nappe flow during the overflow.The spring height along the vertical direction of dam is 2.6 times height of step.The ratio of height of step to the spring length along the slope direction of dam is 15.6.The maximal value of pressure on the horizontal surface of step where the flow falls appears,and the ratio of pressure head to the height of step is up to 1.88.【Conclusion】 The flow spring will surely happen at the first step during the transfer of nappe flow to transition flow with the slope ≥40°.Meanwhile,the flow spring will directly impact the bottom of still basin with the increase of slope,the length and the height of spring flow will increase along with the dam slope and the height of steps as well as the discharge of overflow raising.Moreover,the pressures on the steps vary with the flow springing or impacting.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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