Abstract
The Daharan Dam, like other dams, is subject to concrete surface wear or cavitation in the chute structure. This article looks into the concurrent effects of decreasing the chute angle and slope profile changes from a single slope to a double slope and the simultaneous latitudinal convergence of the chute structure on the cavitation index and the economy of project. In order to perform this research, the geometric specifications were collected of the dam, and the chute structure as well as those of a flood with a return period of 1000 years, which make up the basis of the spillway design. Taking advantage of the numerical WS77 model, different modes were simulated with a single slope, double slope with fixed latitude, double slope with latitudinal convergence, and the cavitation index and the excavation volumes for each option were calculated. The results indicated that a decrease in slope led to a rise in the cavitation index to over 1.2 and that the convergence of the chute structure positively affected the increase in the cavitation index.
Highlights
In the light of the current issues and the ongoing discussions about the shortage of water resources and deepeningHow to cite this paper: Ghodousi, H. and Abedini, A.M. (2016) Simultaneous Effect of Convergence and Reducing Slope of Chute Construction on the Economic of the Plan and Cavitation Index (Case Study: Daharan Dam)
In order to avoid cavitation in the Daharen Dam, instead of constructing the chute structure with a single slope, the slope profile of the chute structure was designed with double slope
In a 2007 research entitled “Cavitation characteristics of high velocity flow with and without aeration on the order of 50 m/s”, Zhi-yong Dong et al stated that experimental study of cavitation characteristics with and without aeration was conducted at the flow velocity 50 m/s in the non-circulating type water tunnel in the Hydraulics Laboratory at Zhejiang University of Technology
Summary
In the light of the current issues and the ongoing discussions about the shortage of water resources and deepeningHow to cite this paper: Ghodousi, H. and Abedini, A.M. (2016) Simultaneous Effect of Convergence and Reducing Slope of Chute Construction on the Economic of the Plan and Cavitation Index (Case Study: Daharan Dam). Cavitation occurs when the concrete surface is eroded and the dam sustains serious damage. Knowledge of this phenomenon and preventing it are fundamental issues that should be considered in the construction of dams. The laboratory environment for the aeration was closely designed and the behavior reducing the cavitation-related damage was investigated from three different aspects. In a 2007 research entitled “Cavitation characteristics of high velocity flow with and without aeration on the order of 50 m/s”, Zhi-yong Dong et al stated that experimental study of cavitation characteristics with and without aeration was conducted at the flow velocity 50 m/s in the non-circulating type water tunnel in the Hydraulics Laboratory at Zhejiang University of Technology.
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