推荐回答（3个）
The control of spillway often set contraction in paragraph after paragraph, and the spillway flow is generally rapids, therefore, will have a steep contraction in paragraph shock waves, so that flow pattern inside the spillway complex. Flow characteristics of the convergent section should be used shock wave theory, analysis and calculation, only the normal hydraulic chute segment can be calculated using the energy equation. Analysis shows that, due to contraction in the normal chute segment and the relative level of different segments, will produce different forms of surface convergence. In most cases, the steep contraction segment control of the spillway chute shock wave over-current capability and side-wall height.
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