The method for numerical simulation of advection-diffusion of blue-green algae using multi-scale model including agent-based model

摘要

The present invention relates to a numerical simulation method for transferring and spreading behaviors of cyanobacteria using a multi-scale model including an agent-based model. The method comprises: a step (a) of allowing a shallow water model performance module to calculate the depth of water and the velocity of flow at a random time and position by using a numerical model to which an HLLC finite volume method is applied to a shallow water equation; a step (b) of allowing a nutrient salt transferring and spreading model performance module to calculate the concentration of nutrient salt at a specific time and position by using a numerical model in which a finite difference method is applied to a nutrient salt transferring and spreading equation; a step (c) of allowing an agent-based model performance module to determine the position and speed of cyanobacteria particles by using a numerical model in which the finite difference method is applied to a flow equation; a step (d) of allowing the agent-based model performance module to determine the moving direction and moving distance of the cyanobacteria particles due to collisions among the particles through probability of the number of cyanobacteria particles in an adjacent grid cell; a step (e) of allowing the agent-based model performance module to calculate the amount of nutrient salts dissolved in a fluid and absorbed by the cyanobacteria; a step (f) of allowing the agent-based model performance module to calculate the amount of nutrient salts used by the cyanobacteria and the amount of proliferated cyanobacteria; a step (g) of allowing the agent-based model performance module to make a segment probability increase as the volume of the cyanobacteria gets larger with respect to a critical volume; and a step (h) of allowing the agent-based model performance module to change the cyanobacteria into a growth mode or a spore mode under a predetermined condition. Therefore, the present invention can accurately simulate ecological mechanism on initial generation and proliferation of cyanobacteria.