The2-D Simulation And Study On Sediment Deposition Of Fen He Reservoir

As an effective means of regulation and control of surface water resources, reservoir is a great significant part of the full exploitation and utilization of water resources systems, for northern dry lands, reservoir is often taken as a source of drinking water, maintain effective storage can not only ensure normal water supply, as well as is conducive to the degradation of pollutants in water, thus improve water quality, however, the problem of sedimentation is prevalence during operation, it will results in reduce the ability of save water resource of the reservoir, decrease the effective capacity and shorten the service life of the reservoir, and will lead to reduce the supply water quality;, increase treatment costs, affect the safety of drinking water for the city residents, therefore, to study the reservoir sedimentation is particularly important and significance.This paper regards medium-sized reservoirs in northern arid regions as.the background, selects reservoir sedimentation as the main study content, applies total thought of environmental system analysis, determines the targeted technical route of study; Based on hydrodynamic model and combines sand transport model, establishes the reservoir hydrodynamic-sand transport coupling numerical model. Taking FenHe Reservoir in Shanxi Province as the research carrier, establishes a two-dimensional numerical model which can describes the reservoir sediment transport in hydrodynamic, does quantitative research on reservoir sediment transport and deposition, reveals the law of sediment transport and deposition of FenHe Reservoir; predicts reservoir erosion and deposition for the next ten years, while put forward suggestions for the current reservoir operation method and reduction measures of sediment deposition, the research results have certain theoretical significance and application value.The study results of this paper are:(1)According to the characteristics of medium-sized reservoirs in northern arid regions, applies the systematic design ideas, comprehensive hydrodynamic and sand transport model, develops a quantitative method of research on the reservoir deposit.(2)Based on the two-dimensional hydrodynamic model, considers all the factors that affect sediment deposition, such as:hydrodynamic, sediment particle size, porosity, relative density, wind field, eddy viscosity coefficient, bed surface roughness, etc., integrated the hydrodynamic model and sand transport model, establishes reservoir hydrodynamic-sand transport coupling model.(3) Taking FenHe Reservoir in Shanxi Province as the research vehicle, combined with the surrounding land and water environment, this research determines the simulation range; and base on natural terrain characteristics of the reservoir, establishes the triangle grid system, applies the smoothing technology to generate the corresponding reservoir numerical terrain. (4) On the basis of determined the basic parameters and the definite condition, simulate for sediment transport and deposition in flood season of2013, at the same time analyses for sediment deposition from1959to2009, the simulation results reveals the rule of sediment erosion and deposition of FenHe Reservoir, more truly reflect the sediment transport and deposition distribution, on the other hand also validates the correctness of the model. the results of the simulation reveals the laws of the FenHe Reservoir sediment erosion and deposition, more truly reflects the transport and distribution of sediment erosion and deposition, forecasts the next decade of reservoir sediment, reflect the reservoir sedimentation trend and the impact on the capacity under the current sediment concentration and operation mode.(5) Provides recommendations for the reservoir current operation method and sediment dredging measures.This study integrated hydrodynamic and sand transport model, establishes hydrodynamic-sand transport coupling model, and applying to the study of FenHe Reservoir, which has certain innovativeness; analysis the hydrodynamic conditions and sediment deposition distribution of FenHe Reservoir systematically, provides a strong theoretical basis and technical support to alleviate the problem of siltation of the reservoir, assure the safety of residents drinking water, promote the rational use of water resources, and give full play to the reservoir’s comprehensive benefit.