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Disturbance on riverbed is one of the key factors for controlling habitat condition in the middle reach of rivers, which depends on the frequency of the disturbance. If it was lower degree owing to some kinds of human impacts (e. g., dam operation, erosion control works and so on), it could cause degradation of habitat quality for many organisms in the river like nuisance growth of attached algae on the riverbed. Therefore, the role of the disturbance on riverbed should be evaluated efficiently, but the convectional study didn't pay attention to it. In the present study, we discuss about the estimation of the role of the disturbance on riverbed by using the effect of detachment of attached algae. Introducing the mechanics of bed-load transport and the impact of the bed-load against riverbed and the relationship between the impact and detachment of attached algae, we can estimate the effect of detachment of it.

EVALUATION OF DISTURBANCE ON RIVERBED BY ESTIMATING DETACHMENT OF ATTACHED ALGAE DUE TO BED-LOAD TRANSPORT