Research About Applying Diffluent Piers With Low Ridge To Jingjitan Hydro-Junction

The results of the finished research show that the new energy dissipater named diffluent piers with low ridge can solve the problem of the energy dissipation and erosion control better in the condition of the low Fr. current, the engineering quantity is saved, and this new art of energy dissipation reserves the abroad practice. The author of this article has experimented, researched and analyzed about applying the diffluent piers with low ridge to Jingjitan Hydro-junction from the point of view of the project applications. We study out several schemes with different parameter of bodily form, make sectional hydraulic model test, and select the best scheme by comparing their effects of the energy dissipation. Then we make whole hydraulic model test to verify its effect of the energy dissipation, and compare the effect of the energy dissipation of the diffluent piers with low ridge with stilling pool by the hydraulic element of the velocity distribution of the current, the wave and the erosion etc. In the end, we calculate and analyze several problems that have to be taken into account when the diffluent piers with low ridge are adopted, viz. if the diffluent piers withlow ridge influence the discharge capacity, if the cavitation erosion will happen and if the structure is steady. By the experiment and analysis, we conclude that the velocity of the current adjust to natural distributing in a short distance, the velocity of the bottom and surface current and the wave are small, and the erosion to the river bed and the bank is slight. Setting diffluent piers with low ridge don't influence the discharge capacity. The velocity of the current between piers are small and cavitation number is big, and the cavitation erosion will happen impossibly. The structure of the diffluent piers with low ridge is steady. So it is demonstrated that applying the diffluent piers with low ridge to Jingjitan Hydro-junction is feasible.