| With the increasing transportation of liquid chemicals, the risk of chemicals spill is getting higher and higher. The reasonable numerical modeling of the spilled chemicals at sea is a key technique for risk assessment and contingency decision making, and the design of decision-making support system based on GIS has academic and applied sense.The tidal ground is the key factor which affects the action of spilled chemicals. Based on analysis of the state numerical modeling on the tidal current, the Ningbo-Zhoushan harbor was selected as the application region with simulated tidal ground using POM.Because of the flexuous coastal line and the diverse topography near the harbor, nested grid method was used to simulate the concerned area. The opening boundary condition of the small area was obtained from the calculation results in large area.Then the tidal consistent constant was calculated and saved as the data in map layer for tidal fast prediction. The result of the model and investigative data indicated its rationality.Based on the analysis of the research and application of numerical simulation of the status quo of environmental pollution in coastal waters, according to the type of settlement of the nature of chemicals and their behaviors at sea, settlement-based numerical simulation of chemical behaviors of the convection-diffusion equation model and Lagrangian particle migration patterns were established.Later the model was applied in a simulated chemicals spill accident around Ningbo-Zhoushan harbor.The quantity of spilled chemicals,the type of chemicals,the marine environment background et al.were inputed in the model,and the physical and chemical character of the chemicals from established database were got and its individual action for each progress was finally simulated by the established model. |
