Abstract
According to the previous report, by discussing the frequency range of wave form of the fluctuation amount of flowing water generated inside open channels, the most important information could be extracted, and with this, evaluation of the dynamic character of the open channel system in simplified form became possible. Furthermore, it was found that aside from the flow effect, open channels have the stock effect capable of performing the essential role of the smooth water management. It was also clarified that the general index of both the stock effect and flow effect expressed in mean retention time and relative retention time represents the effect that averages the fluctuations.
In this regard, this report investigates water management considering the stock effect inside open channels in situating the mean retention time and relative retention time for solution of the water management problems by using the method discussed previously.
As a result, the fluctuation absorption has frequency effects and depth effects. Both these factors have effects connected to each other.
As for its application to the problems of water management, open channels that were made as models in the continuous elements were investigated. As a result, the relative retention time is an index to decide the condition of water management (supply-oriented type or demand-oriented type).
