Funiuxi Water Quality Improvement Measures Impact On Hydrodynamic Numerical Simulation Study

The problem of river water pollution in China is very serious, Chongqing heavy pollution in typical small seasonal river Funiuxi as the research object, research has been carried out in Funiuxi seasonal river waterpower measures.This paper first established in Funiuxi water power and water environment are analyzed, hydrodynamic numerical model and the establishment of Funiuxitypical retention area, then according to the characteristics of Funiuxi seasonal rivers, to simulated.the improvement measures of the wet season and dry season flow under different conditions. Finally, according to the analysis of the simulation results of Funiuxi, a scheme is proposed for technical methods to improve the hydrodynamic action. The research results of this paper can effectively guide the practical work of Funiuxi water environment improvement. Study on the dry season simulation conclusions are as follows:①2 x 104m3/d the amount of ecological water on the simulation of water power to improve the effect of limited scope. If the water supply from 2 x104m3/d to 4 x 106m3/d, inhibition of Duckweed growth dynamic water surface area accounted forthe proportion increased from 1% to 14.2%, but the water replenishment measures is not conducive to the actual implementation of the project, on the other hand, water transfer costs are high, so the only way to inhibit water the typical residence district Funiuxi algae growth can not be implemented.②Landscape fountain for the typical hydrodynamic retention area significantly improved. Retention area increased 3 landscape in the form of a fountain, inhibition of Duckweed growth water power for water area ratio increases from 19.3% to80.7%, and the installation distance is 10 m, installed the fountain(triangle, straight line type water power) to improve the retention of different area was not significantly different. In the actual project 3 can be installed, the distance between the 10 mfountain, to improve the water retention area.③Water power plant caused not promote growth of algae in Funiuxi. Thescattered resettlement areas of the island remained plants, for the river water areahas not significantly improved, but because the plant island growth plant required for the growth of N, P and other nutrients and shading can inhibit the growth of algae.So this method can provide a feasible solution for the improvement of Funiuxi water quality is poor place.④Study on the Riparian zone of Funiu Creek river hydrodynamic effects on the numerical simulation results show that in the wet period, littoral of the overall river water power hinders, but the main channel water power has improved, has little effect on the river water level.1)The width of the riparian zone for different hydrodynamic flow area planted riparian zones of inhibition. To the river main channel has obvious improving effect.2)Beach with little effect for Funiuxi water level. Belt planting width on the shore is increased from 5m to 13, the absolute level of the river has been in the 7 meters,little change.After the analysis, simulation of River riparian planting width of less than 10 m is reasonable.