Abstract
Erosional processes of fluid mud in Lake Kasumigaura were examined in a test flume for the sake of practical estimations of mud suspension in the lake. The mud is characterized by its high water content, higher than 1000% around its surface. As the water content is regarded as a major factor on the entrainment of mud, the vertical distributions of water content were measured with a high precision. The displacement of mud surface caused by both erosion and compression was also measured respectively in a careful way. A simple data analysis showed that the entrainment rate of mud was expressed as a function of water content of mud and flow velocity, which expression would be useful in practical ways.
