Seite - 679 - in Book of Full Papers - Symposium Hydro Engineering

provided by flowing electrical current in copper wires of the sensing cable. When forced to change temperature the cable will need a certain time to arrive at a certain temperature, defined as T-heating, and as well a certain time to go back in its initial condition. Studying the cooling transient and the value of the maximum temperature reached during the heating phase the analysis software figure out automatically if some events are occurring. Fig. 3 Sensing cable installation at Grand Ethiopian Rennaissance Dam (GERD) Fig. 4 DiTemp Heat Pulse Method working principle As an example, a cable surrounded by still water will require more time to heat up, while a cable within flowing water will cool down more quickly. 679