Model study on reinforced concrete orifice of high dam

Abstract In this paper the experimental study on structure characteristics and failure mechanism of reinforced concrete orifice in high dam are presented. Seven small models and one large scale model are to be used. The stress and strain of reinforcement, crack width and its development are studied in detail.

Study on effect of Lode angle variation of stress

Abstract According to the complete stress increment formulation of soil elastoplastic stress strain relation presented in this paper, the effect of Lode angle variation of stress is owing to the shear yield and dilatancy of the generalized shear division of stress increment. The computation methods for the plastic deformation (drained) or pore pressure (undrained) caused by pure variation of stress Lode angle are also provided. The computation results accord with the relevant experimental data qualitatively.

Inversion analysis of viscosity coefficient of dam and rock foundation

Fuzzy iteration methodology of reservoir food operation for flood control

Abstract A fuzzy iteration methodology, which gives the objective weight and the relative membership degree of alternative at the same time, is presented in this paper. Since the weight and relative membership degree are directly obtained from the recommended alternatives supplied by decision makers, the results are more reasonable and realistic and the difficulty of weights determination can be avoided. Based on strong and flexible decision making support system, the effectiveness of decision making is improved.

The wavelet estimation of Hurst coefficient in hydrological time series

Abstract In order to describe the correlative configuration of annual flow peak series, the wavelet estimation method of Hurst coefficient is introduced. The method is compared with the existing methods and used to calculate the wavelet estimation value of annual flow peak series.

Infiltration parameter and reduced infiltration rate coefficient determination

according to data of surge flow border irrigation

Abstract Based on the principle of balance of surface irrigation water volume, a method for determination of field average infiltration parameter according to the irrigation data is introduced. On this basis, the method for determination of reduced infiltration rate coefficient from irrigation data of surge flow border irrigation is deduced. The calculation example shows that the method is simple and effective.

Study on evaluation of soil water resources

Abstract Data observed in Wangtong Experimental Area, Hebei, are analyzed as a case study to explore the method and content for evaluation of soil water resources. The annual recharged soil water and the amount of usable soil water in crop growing period are used as the main indices to evaluate the soil water resources.

Water deficit crop yield model based on remote sensing and crop photosynthesis

Abstract In this paper, the concept of crop yield model affected by water deficit is discussed. A model is established based on the remote sensing information from NOAA AVHRR,crop photosynthesis characteristic and meteorological data. In the model the crop stomatal conductance acts as an explicit parameter。The yield distribution of winter wheat in North China Plain is demonstrated as an example. It shows that this model possesses higher accuracy than other existing models.

Experimental study on water production function for subsurface drainage

Abstract Based on the analysis of existing water production function for subsurface drainage,four new functions are suggested.The parameters of these functions are determined by field data observed in experimental station of Anhui Institute of Water Resources.

Study on 3-D line buoyant jets in cross flows

Abstract Hybrid Finite Analytic Method(HFAM)and staggered grid are applied to calculate the line buoyant jets in cross flows.The phenomenon and development of end-vortex are simulated successfully and the influences of diffuser length and buoyancy on turbulent buoyant jets are analyzed.

Numerical Simulation of sediment deposition and horizontal

axis circulation flow in lateral trenches

Abstract A 2-D flow-sediment mathematical model is established.The flow field is calculated by using zero-equation turbulence model with boundary-fitted coordinate system.The concentration field of suspended sediment is calculated by using diffusion equation.The sediment deposition and the horizontal axis circulation flow are simulated and their relationship is also analyzed.

Propagation of Surface Wave Over Twain-circular Shoal

Abstract Parabolic mild-slope equation and modified mild-slope equation are applied to solve refraction-diffraction of waves over twain-circular shoal.The results are compared with that of single circular shoal.The phenomenon of evanescent wave is found.

Design of Flow Cutting System with Compressed Air for Pump Station

Abstract The operation principle and design method of flow cutting system with compressed air are introduced.An example is given.

Optimization of impact position and simulation of small vibratory pile driver

Abstract The mechanical model of the small vibratory pile driver is established. The optimization of the impact position is analyzed and the best working condition is deduced. The simulation of the mechanical system is carried out by means of computer. The suitability of the model is verified in the practice of a sample machine.

Real time simulation of navigation condition of ship