TURBID WATER BEHAVIOR DURING FLOOD IN THE KAWAJI DAM RESERVOIR

We have conducted field observations for turbid water behavior during flood in the Kawaji dam reservoir in the summer and autumn seasons of 2002. The detailed data sets of water-temperature, turbidity, suspended solid, flow velocity, and grain-size distribution were obtained in the reservoir and its inflow river during flood. The observed data in the curved part of the reservoir indicated that we should take account of three-dimensional flow for more accurate estimation of the turbid water behavior. Furthermore, we also conducted numerical simulation of the behavior in the reservoir using 2D model. The simulated results indicated that the grain-size distribution of inflow water can largely change during flood in the reservoir.