Applied Mechanics and Materials Vols. 256-259

Abstract: As an important yardstick of water quality evaluation, total dissolved solids (TDS) is strongly correlated with apparent resistivity and static spontaneous potential (SSP) parameters from electrical logging curves.A lot of electrical logging data accumated in the hydrogeologic survey during last decades can be used to predict the underground water TDS. Based on electrical characteristic analysis of sandstone reservoir, taking the influfential factors of the Archie’s Equation and creation mechanism of spontaneous potential (SP) as starting points, the theoretical relationship between the underground water TDS and formation resistivity (Rt) without considering the infuence of the porosity is modeled in this paper, and also the relationship between the underground water TDS and SSP in the same section of drilling well. Utilizing the apparent resistivity logging and static potential logging data, and employing the numerical fitting method, the relationship between groundwater TDS and conductivity is analyzed and determined, finally, the electrical parameters of determining the water quality and the regional evaluation of water quality are expounded in Daqing oil field,songliao plain Quaternary sandstone aquifer.

Abstract: According to the high earth dam with a large volume, high construction intensity, tense schedule, numerous construction machines, complex technology, and a lot of unexpected risk factors, the construction transportation becomes poor if the arrangement for transportation to the dam is unreasonable, which may result in schedule delays. This paper discusses the system of the real-time 3D visualization on network environment which is based on Unity3D engine, and the query of real-time three-dimensional visual information for transportation to the dam on the network environment is achieved. Users can have a real-time view of the dump truck during transportation and optimize the arrangements of construction organization. The results of research have great practical significance.

Abstract: The numerical simulation study for water conveyance of inverted siphon on water security is of great significance. Three-dimensional air-water two-phase flow turbulence model coupled with VOF（volume of fluild） method is proposed to simulate water transfer project of Luolingou inverted siphon in the east route of the South-to-North Water Transfer Projec.Moreover, mesh sensitivity and the distribution of air-water volume fraction is analyzed. The simulation results show that the flow capacity of inverted siphon with the increased flow rate 60m3/s is enough for the requirements, which gain the validation of the engineering structure reliability. The analysis of mesh sensitivity suggests that the fine grid model is identified reasonable and effective.

Abstract: Construction progress and quality are two important objectives in the construction of high core rockfill dam. It is of great significance to evaluate their control effect comprehensively. In this paper, the progress and quality of high core rockfill dam construction management are the study objectives. in order to achieve the real-time control of coupling them, the comprehensive evaluation method for the quantitative analysis of their complex relationship is proposed. Based on the comprehensive analysis of the mechanisms of the influence related factors in the construction process, the comprehensive evaluation index system of the high core rockfill dam coupling construction progress and quality is designed ; the comprehensive evaluation index data acquisition process is analyzed; the comprehensive evaluation method for the high core rockfill dam filling unit is put forward. finally, a comprehensive evaluation of high core rockfill dam filling unit model based on TOPSIS is established. Engineering examples show that this method plays a guiding role in real-time control of coupling high core rockfill dam construction progress and quality.

Abstract: This paper will examine the concept of evapotranspiration (ET) in more detail and provide more details into the concept of reference evapotranspiration (ETo) and of the measurement and estimation of ETo. Studies of ET models usually involve the comparison of a single model in different climates, different model types in the same location, or model output to either lysimeteric measurements or a local evaporation pan. This paper will examine the performance of ET models versus ET measured using lysimetery or pan evaporation and the performance of ET models when compared to a standard ETo model. A review of the performance of pan evaporation to the standard ETo model will also be performed.

Abstract: By analyzing feeding sources and material accepted fields involved in the earthwork allocation for rock-fill dam, a dynamic model of earthwork allocation is set up by incorporating dynamic programming. Dividing filling and excavation process into n steps, functions of allocation costs during each period is defined according to equation of state transitions, on the basis of which the optimization function is formed. Then the sequential method is employed to get the optimized solution. Finally a practical case is studied for application of this model.

Abstract: Optimization degree of risk population allocation on evacuation route is one of the key points impacting emergency evacuation efficiency in dam-break event.The evacuatees optimization allocation mechanism considering route flow and route length was studied; optimization degree evaluation methods based on submerged number were constructed; corresponding formula for calculating submerged number was deduced; optimization degree classification and its standards were put forward; its availability was proved through case simulation.

Abstract: Based on the Reynolds averaged Navier-Stokes equations, numerical simulation of unsteady flows in the flow passage in spiral case of a hydro-turbine was conducted. The computational domain of the flow passage includes spiral case, stay vanes and guide vanes. The RNG turbulence model in curvilinear body-fitted coordinate systems with finite volume algorithm is adopted. Numerical calculations are conducted under the boundary condition with operating regime for current guide vane openings. And pressure distribution and velocity distribution within the flow path are obtained. The results are helpful to improve the comprehensive hydraulic performances and to enhance the operating stability of a machinery set.

Abstract: This paper experimentally investigated hydraulic characteristics in working section of multi-square-hole orifice plates of hydrodynamic cavitation reactor by use of three-dimensional Particle Image Velocimetry (PIV) and High Speed Photography etc. Arrangements of holes in the orifice plates can be divided into diagonal, cross and checkerboard categories. The three-dimensional velocity distribution, pressure and cavitation characteristics for each arrangement of multi-hole orifice plates were measured by PIV system, pressure data acquisition system and high speed camera, and a comparison of hydraulic characteristics of the three categories of arrangements of the multi-hole orifice plates were made.

Abstract: The discharge capacity, pressure and downstream dissipation for scour prevention under fluctuating pressure of the power station headwork spillway dam were measured and analyzed through model test. The research showed that the discharge capacity of the spillway dam met the design requirement, the designed body type of the spillway dam met the requirement of standards. The modified spillway basin body type and the downstream protection type could meet the requirement of dissipation for scour prevention. In the experiment, the mean square root, spectral characteristics and amplitude sampling of the spillway dam flow fluctuating pressure were measured and analyzed. The maximum fluctuating pressure mean root was about 4.31m water column, the dominant frequencies of flow fluctuating pressure at all measuring points ranged from 0.01 to 2Hz (prototype), and the random process of the flow fluctuating pressure conformed to probability normal distribution (Gaussian distribution) on the whole.