Abstract
As part of an investigation to evaluate the performance of Advanced Submergible Aerators installed in Hiyoshi Dam Reservoir (Kyoto), a field experiment was conducted on a destruction of a thermocline formed in August and October, 2012. At first, water temperature distribution near one aerator was observed in a vertical section of 10m-depth and 90m-disrance, by moving an observation device automatically from the aerator to a bank of the reservoir. Secondly, water temperature di stribution between two identical aerators 275m apart from each other was observed with five observation equipments fixed at regular intervals between two aerators. From these data, a horizontal intrusion of the entrained water, having an important role to destruct the thermocline, was visualized and its fundamental characteristics were clarified.
