STUDY ON MOVEMENT OF SUSPENDED SOLID AND ESTIMATION OF SEDIMENT RESUSPENSION IN AN OXBOW LAKE

Field observation of turbidity, chlorophyll and current velocity was conducted in the Barato River, which is the oxbow lake in the Ishikari River. In this oxbow lake resuspension of the sediment is main factor of water pollutant. In this survey, relationship among sediment resuspension, wind speed and current velocity were investigated. And the rate of sediment resuspesion was estimated by using observation results.Clear relationship exists between wind speed and turbidity when the wind speed was larger than certain level in each survey point. We tried to estimate the rate of sediment resupension by the methods in our study. The estimated value was generally adjusted to observed results in 2005; however, considerable difference was found in 2006.