The Probe Into The Weakening Wave Mechanism And Hydraulci Design Of Diffluent Piers With Low Ridge

The wave is the core problem of low Fr. current .In order to make diffluent piers with low ridge to be popularized and applied, the surface wave of low Fr. current is chosen as the research object .We measure the surface wave elements and the velocity distribution of various diffluent piers scheme by the experiment of physical model. We also analyze the average wave height, the the average value of the square of wave , unit width of the wave's energy , the probability density distribution of wave height ,and the power chart character, so as to reveal the weakening wave mechanism of the diffluent piers . We look for the optimum alternative on the basis of analyzing the internal connection of the diffluent piers body style parameters and the wave. What's more ,we put forward some experienced formulas on the basis of the cortical analysis .The result of the research show that by installing diffluent piers with low ridge, we can eliminate the root of oscillatiny water jump, perfect the energy dissipation effect of water jump, also, we can improve the flow condition ofdown-stream .The fact that the main flow of down-stream is in the middle ,not only effectively lower the speed of the bottom flow in the ridge rear ,alleviate the erosion to the river bed ,but also avoid the heavy wave resulted from the main flow in the surface ,thus improve the surface wave of down-stream obviously .We can work out the body style parameters of diffluent piers with low ridge according to the project flow condition and experience formulas ,and then reckon the down-stream surface wave condition for the protected building of the down-stream bank.