Study of Biological Film Effect on Fine Sediment Erosion at the Bed Mud Surface in Estuary

Abstract

The erosion behaviour of fine cohesive sediments is not yet well understood by the complexity of its physical and biological property. In order to discuss the effect of biological film formed on the bed mud surface, experimental investigations for erosion are performed by using the annular flume at Fukuoka University. Basis for the comparison of experimental results are as follows. 1) under the biological film formed condition, the erosion rate was decreased. 2) the biological film thickness under the high water temperature was thicker than the low water temperature condition. 3) the thickness of biological film reached 7mm at the maximum.