RESEARCH ON POLLUTION DIFFUSION REGULARITY NEAR SEWAGE OUTLET AREAS IN CAIDIAN REACH OF HANJIANG RIVER, CHINA

摘要

Researches on the regulation of pollutant transition and diffusion in rivers are significant in engineering. A 2D-hydrodynamic and water quality model is developed based on the Navier-Stokes equation and the k-ε turbulence model. The model is used to simulate the 2D-distribution of pollutants along Caidian Reach of Hanjiang River under different discharge conditions for a proposed sewage outlet, and satisfactory results are achieved. Results show that chemical oxygen demand (COD) level exceeds surface water Class Ⅳ standard, with the accidental discharge of sewage outlet and when the pollution range in the river is wide, which seriously affect downstream water quality. We suggest that supervision and disposal should be strengthened, particularly in the case of accidental discharge. The space-time distribution of pollutants provides a scientific basis for water environmental planning and management research.