DEVELOPMENT OF A DETACHMENT MODEL OF ATTACHED ALGAE CONSIDERING EFFECTS OF SEDIMENT DIAMETER AND COMPOSITION OF ATTACHED ALGAE

Abstract

The growth and detachment of attached algae are key processes in riverine ecosystems. Flood impacts are one of the major factors causing drastic changes in the attached algae community. However, the detachment of algae during a flood is a complex phenomenon. In previous study, it was suggested that the detachment ratio was closely correlated with work performed by sediment impinging on the substrate. However, the previous model was not able to account the effect of diameter well. In this study, I intended to create the detachment model that considering effects of both sediment diameter and the composition of attached algae. The experiment of detachment of attached algae and the analysis of sediment transport were conducted to evaluate the model. Finally, the detachment model that considering the difference of sediment diameter and the composition of attached algae was proposed.