The paper uses the research means of numerical simulation for the current environmental pollution problem of the ocean dumps from offshore industries, which is concerned by the coastal countries; it adopts ECOM 3D Porous Water Quality Model for the 900,000ton Pulp, 450,000ton packing boards and 450,000ton cultural paper of Stora Enso Guangxi Forest-Pulp-and-Paper Co., LTD; and it has carried out the simulation research on those projects' influence on the environment of sea area, and reseached and confirmed the influence range of sewage point's diffusion and the rationality of sewage point's location.
The sewage point B3 of Stora Enso Guangxi Forest-Pulp-and-Paper Co., LTD locates in Guangxi Tieshan Bay (see Figure 1-1. Tieshan Bay is a table-land and submerged-valley bay in the funnel shape with north-south orientation; it has over 40km water area from south to north and 4km east-west width, when the widest part from east to west is 10km; it is the depression structure drowned by the lifted sea level in the post frozen age, so it has 40km long (from the bay's top to the shoal) and 3~4km narrow tidal channel(ZHAO et al., 2002).
The paper use the method of ECOM 3D hydrodynamic numerical simulation(WANG et al., 2008).Hydrodynamic equations include the continuity equation and momentum equation. Continuity Equation: ∇.⊽ + ∂W/∂Z = 0 (1) In which: ρ 0—the reference density; ρ —the in ditu dendity; P—the pressure; KM—the vertical eddy diffusivity of turbulent momentum mixing; f—Coriolis Coefficient; V v—Horizontal Velocity Vector; W—Vertical Velocity; U, V—Horizontal Components of Velocity corresponding to x, y Axes; t—Time Coordinate;z—At Searwater's Surface, z=η(x, y, t), On seafloor, z=-H(x, y); g—Acceleration of
