A STUDY OF WAVE CHARACTERISTICS AFTER HYDRAULIC JUMP

An experimental study of wave characteristics after jump in energy dissipation ofhydraulic jump is presentedinthis paper.It was completed in a trough with a horizontal bed,40cm in width.Various elements of wave were measured,the wave form,period,spectrumand its attenuation along course are analyzed,and the physical mechanism of wave is discussed.An expression of the maximum wave height after jump is given,based on the measured data.Some measures to diminish wave are discussed preliminarily also.     

梯形断面渠道中水跃共轭水深计算

提出先由经验公式计算梯形断面渠道中水跃共轭水深的初值，然后由相应的公式计算出准确的共轭水深的方法。     

HYDRAULIC CHARACTERISTICS OF PARTIAL OPENING OF THE WORKING GATE FOR A DISCHARGE TUNNEL

The partial opening of the working gate for a discharge tunnel is used more and more widely in the various conditions, such as releasing discharge to meet the needs of the various stages under construction, or of the operations at low reservoir levels. In this article the hydraulic characteristics were investigated of the partial opening of the working gate based on the physical model experiments of the discharge tunnel for the Longtan Hydropower Project, including the discharge coefficient, the surface profile of the free flow section, the bottom pressure distribution of the tunnel with an aerator, the cavity length just from the ramp, and the wall pressure of the curve section of the outlet. Some new issues were discussed and the properties were presented of the partial opening of the gate.     

WAVE-BODY INTERACTIONS FOR A SURFACE-PIERCING BODY IN WATER OF FINITE DEPTH

Nonlinear wave-body interactions for a stationary surface-piercing body in water of finite depth with flat and sloping bottoms are simulated in a two-dimensional numerical wave tank,which is constructed mainly based on the spatially averaged Navier-Stokes equations with the model for simulating the turbulence.The equations are discretized based on the finite volume method and the scheme of the pressure implicit splitting of operators is employed to solve the Navier-Stokes equations.By using the force time h...