CRITICAL DEPTH MODEL (MODIFIED SVERDRUP EQUATION) —DESIGN METHOD FOR BUBBLE CIRCULATION—

抄録

 A new critical depth (z_cr) model was developed by adding light saturation effects during photosynthesis to a Sverdrup z_cr model in order to design an artificial circulation system as a countermeasure to eutrophication. A Blackman-type equation was selected from various P-I equations for its accuracy and relationship to the original Sverdrup model. Quantitative differences between the z_cr values of some new equations were found to be remarkable in specific high light conditions. Furthermore, the z_cr calculated by the Sverdrup model overestimated the z_cr compared to the modified Sverdrup equation proposed by this research. We discuss methods for the design of a practical air diffuser depth that prevents cyanobacteria bloom from the point of view of design and management of bubble circulation countermeasures.