Applied Mechanics and Materials Vols. 170-173

Abstract: The consistency of hydrological series has been destroyed by the impact of human activities and climate change. Hydrological series is consist of certain component and random element. The random and certain components of hydrological series are identified and separated through statistic analysis. The certain element is determined by using hydrologic model while the consistancy of random element is confirmed directly by hydrological frequency curve. And then add them together. The runoff series of the Huangtai Hydrometric Station in the Xiaoqing River is for example. It proves effective and feasible and the result accord with the reality of the basin.

Abstract: In this paper study findings of flow-induced vibration of gate in the emptying culvert of Tishengqiao power station are presented. At first stage structure’s dynamic characteristics are investigated carefully using the experimental modal analysis technique, and entire structure modal information is obtained. In addition, flow pulsating pressure properties acting on the gate are investigated. Various physical values including vibration acceleration, dynamic displacement and dynamic stress caused by high velocity flow are studied. Finally gate structure’s dynamic reliability is analyzed and safety operation principle are presented.

Abstract: The video surveillance system creates a basic condition for the operating and management in hydropower project to realize the aim of nobody on duty. This paper introduces some key technologies like image compression, image transmission and im video surveillance system age storage in the process of the middle line of the south to north water transfer project brake stood monitoring system, and to analyses the basic function like video surveillance, video control, video service, video coding, video search as well as video storage , in order to provide some references for the decision support system about river basin of water dispatching decision and management.

Abstract: Arch dam’s failure is a super nonlinear irreversible process. The research on process of it would give quite important information for safety evaluation. In this paper, it analyses overload of the highest RCC arch dam of the world with explicit FEM and shows the process of dam’s failure from normal operation, local deformation to overall failure by water-level overcharge method. It gives a more direct and precise safety factor. This method is also can be used in other structures.

Abstract: In this paper, a two-phase flow model combined with the Realizable k–ε turbulence model was used to simulate hydraulic characteristics of two-type dissipaters: the stepped spillway combined with stilling pool and the stepped spillway combined with wide tailing pier and stilling pool. The distributions of physical parameters, such as velocity field, pressure field, turbulence kinetic energy and turbulence dissipation rate were obtained. The grid was generated by using the regional division method, the unstructured grids used for the irregular and complex parts and the structured grids for the regular and simple parts, and the grid density is arranged according to the flow gradient size. The finite volume method was adopted to discretized the control equations; and the VOF method was adopted to deal with the free water surface; and the PISO algorithm was used to solve the velocity and pressure coupling equations. A comparative analysis of the two energy-dissipators in the velocity field, pressure field, turbulence kinetic energy and turbulence kinetic energy dissipation rate shows that the dissipation of overflow for a stepped spillway together with wide tailing piers and a stilling pool jointing energy dissipator is better than that with pier situation.

Abstract: Priority invested to conduct danger control and reinforcement according to the severity and risks of dams is a vital issue to Chinese government and administrative departments faced because of the large amounts of dangerous reservoirs. Dams risk sequence based on the dam deficiencies offers a new idea of danger control and reinforcement and its sequence decision-making.

Abstract: Traditionally the water resources development activities in China were related to improving irrigated agriculture. The quantity based administrative allocation is the most common water allocation mode in China today. This paper analysis the water allocation of Yellow River basin in Shanxi province via technical methods. The objectives of water allocation in Yellow River basin are expressed in terms of priority settings, and different demand management options are also evaluated using the proposed methodology.

Abstract: Pumping test is a common method to obtain the hydrogeology information for underground engineering construction, of which monitoring groundwater level is an important part. A system of automatic and continuous monitoring groundwater level was developed to meet the special requirements of pumping test. Considering the characteristics of groundwater level change in pumping test, the sensor of water pressure based on vibration string was used. For connecting the sensor and computer, serial communication protocols were programmed in JAVA language. The system was applied to an engineering project, and it achieved the satisfactory effects.

Abstract: TongGuTan shoal is typical pebble shoals of branching reach with bend in upper course of Yangtze river. Based on 2D numerical model and physical model tests, the features of flow and sediment movement, obstructing-navigation mechanism be studied. In order to achieve permanent improvement of navigation condition, it is suggested to excavate straight channel for navigation. The new structure such as bags-filled-stones dam body, irregular concrete block have achieved the good effects. It provides a good example of dredging construction in flood season to the similar shoal.

Abstract: Debris flow sabo dam is one of the most widely used debris flow control engineering. Its stability and safety operation is a key to controlling the effect of hazard prevention and avoiding secondary hazard. Because of the particularity of debris flow, it’s very hard to observe the process and morphology directly by field investigation. Although the scouring depth calculation method in hydraulic engineering provide an idea for debris flow sabo dam, but it can’t be used directly for the calculation of scouring depth downstream of debris flow sabo dams and foundation designation of the control engineering. This paper analyzed the influence factors of scouring laws downstream of debris flow sabo dams and the research status home and abroad. It suggests studying the scouring process and laws downstream of debris flow sabo dams by theoretical analysis, mechanical analysis and energy method combined with simulation experiments, establishing quantitative relationship between the scouring laws, limited depth, morphology, sediment transportation characteristics and the feature parameters of debris flow.