Chen Xiaohong Tu Xinjun |
(Zhongshan University) |
Abstract In this paper,the features of the risk for pollutant concentrations exceeding the standard values(RCESV) are analyzed and the Clustering Stochastic Point Process Compound (CSPPC) model is developed based on the theory of stochastic point process.The model is used to evaluate the rate of RCESV at the outlet of Xili Reservoir.The distribution of the point process for concentrations exceeding the standard values is tested and fitted by measured data.The results are satisfactory.
Key words water quality,risk for concentrations exceeding the standard values,Clustering Stochastic Point Process Compound model.
Shen Dajun Yang Xiaoliu Wang Hao Wang Dangxian Ma Jing |
(China Institute of Water Resources and Hydropower Research) |
Key words urban residenital water demand,demand function,elasticity coefficients.
| Liu Chunping |
| (Hunan Normal University) |
| Shao Mingan |
| (Institute of Soil and Water Conservation,CAS) |
Abstract The boundary layer movement of solute transport in a semi-infinite soil media is studied in this paper.Laplace transform method is applied to deduce the boundary layer flow equation for solute transport in soil.The mathematical analysis shows that the assumption of solute flux in boundary is valid in calculating the advance distance of boundary layer and solute concentration profile.The boundary layer movement equation is applicable in estimating the parameters of solute transport.
Key words soil,solute transport,boundary layer theory.
| Li Nansheng Zhou Jing Lin Gao |
| (Dalian University of Technology) |
Abstract Based on the method of contact mechanic,a dynamic contact model for high arch dams with contraction joints under earthquake excitation is estabilished and the corresponding numerical solution of penalty for the method is proposed.In this model the opening and closing of joints as well as their frictional reaction are modeled by contacting boundary surfaces and the rigrous contact constraints are considered so that this model can describe the dynamic response of joints precisely.The explicit integration and penalty method,which is compatible with the explicit operators,is adopted.The applicability of the algorithm is illustrated by numerical calculations of two expales.
Key words high arch dam,vertical contraction joint,dynamic contact model,penalty method,explicit operators.
| Lian Jijian Cui Guangtao Lin Jiyong |
| (Tianjin University) |
Abstract A computational model for flow induced vibration of over flow high arch dam is proposed. The hydroelastic model test results of three high arch dams and the prototype observation data of an arch dam are used to verify the feasibility of the model. Rough agreements have been attained. It is concluded that the response of flow induced vibration of over flow high arch dam can be predicted by using this computational model according to the fluctuating load measured in a conventional hydraulic model.
Key words flow induced vibration, high arch dam, calculation model, verification.
| Chen Weizhong Zhu Weishen |
| (Institute of Rock and Soil Mechanics,CAS) |
Abstract Based on the hypothesis of equivalent strain, the rheology and fracture damage coupled model for rock mass is developed. The model is applied to analyze the stability of the slope in shiplock of the Three Gorges Project during excavation.
Key words jointed rock mass, excavation, fracture damage, coupled, rheology.
| Wu Mengxi Gao Lianshi |
| (Tsinghua University) |
Abstract This paper presents an adapted finite element method for unsaturated analysis. Numerical confusion phenomenon in unsaturated seepage numerical analysis is avoided effectively. A new method for seepage spill boundary handling is also presented. Some analysis examples are given.
Key words unsaturated, unsteady, seepage, spill boundary, numerical method.
| Chen Jiansheng Wang Yuan Zhao Weibing |
| (Hohai University) |
Abstract An isotope tracer method for detecting the permeability and its parameters of fissured rock in borehole is presented in this paper.Based on the combination of dilution logging and tracer logging methods the flow principle is established.The formulas for calculating the permeability coefficient,equivalent mechanical fissured rock width,static water level,reference radius and hydraulic gradient of the coupled well system are proposed.
Key words isotope tracer method, flow principle, well flow, fissured rock,seepage flow, borehole.
| Qin Chongren Qiu Xueyan Li Dejun |
| (Tianjin University) |
| Zao Chongjiu |
| (Tianjin Research Institute of Water Transport Engineering) |
Abstract The concept of wave spectrum is applied to the study on bottom shear stress under random wave action.According to the wave characteristics in shallow water,the wave spectrum is used as the input spectrum to determine the bottom shear spectrum through the transmission function and the output spectrum is obtained as the result.The instrument for measuring the bottom stress is developed.
Key words random wave, wave spectrum, laminar boundary layer, bottom shear stress spectrum.
| Cheng Zhao Chen Shenghong |
| (Wuhan University of Hydraulic and Electric Engineering) |
Abstract Based on the hierarchical characteristic of p-version FEM,the analytic process and the way to realize the 3-D hierrchical FEM are explained in detail,including the construction of basic functions,the way to deal with the constraint conditions,the formation of stiffness matrix and load vector as well as the method for efficient numerical quadrature.The concepts of virtual nodes and generalized nodes for 3-D hierarchical FEM are introduced.The method is applied to hydraulic structure calculation practice.
Key words FEM,hierarchical element, 3-D analysis,p-version,hydraulic structure.
| Liu Run Yan Chi Xu Yu Yan Shuwang |
| (Tianjin University) |
Abstract In this paper, the process of the model test is presented in detail. The test data are sorted out and analyzed. The effect of crack mechanism is taken into account and a constitutive relation for cracked soil is established. An elastoplastic finite element program is developed in order to simulate the model test procedure. The calculated result is in good agreement with the test data.
Key words model test, crack, earth pressure, deformation.
| Li Wenguang |
| (Gansu University of Technology) |
Abstract The flow field in an impeller of centrifugal pump is calculated numerically by applying the finite differential method in body-fitted coordinate system. The differences of average relative velocities between computed results and model test data are 11% in average at best efficiency point. It is concluded that the numerical method possesses satisfactory accuracy in the calculation of quasi 3-D inverse problem in the design of centrifugal pump blade。
Key words centrifugal pump, impeller flow, numerical solution.
| Li Shicai, Wu Getang, and Lin Ying |
| (Guangxi Nanning Design Institute of Water Resources and Electric Power, Nanning 530001) |
Key words Γ function; Γ distribution function; new interpretation of the algorithm; the exact analytic expression; mathematical model;numerical evaluation.