Abstract
The tidal dam is a new technoIogical construction designed to improve the ecological environment of culture
farm by providing oxygen to the oxygen-deficient sea water of the bay bottom in summer.
There are three types of tidal dam ; One-Pipe-Type, Two-Pipe-Type (a), Two-Pipe-Type (b). The focus of this
Study is experimentally and theoretically to find out a method of calculating the discharge of pipe-1ine in the Two-
Pipe-Type (b) [TPT (b)] tidal dam among them. In this type tide dam, two pipes of different diameter were used.
They were placed on the sane axis at some distance (⊿) from each other. TPT (b) doesn't need the gate for
controlling water flow. At flood tide, the surface bay water flows into the reservoir through the upper pipe by its
potential energy. At ebb tide, Water flows from the reservoir into the bottom of bay through two pipes.
We here report a method to calculate discharge flowing through the two pipes.
(1) The coefficient of energy loss (⊿f) occurring at the distance between two pipes, Which can be calculated by
the equation (8), is in functional relation with their cross sectional area ratio (A2/A1), their distance ratio (⊿l/
D1) and Reynolds number (Re).
(2) The discharge of TPT (b) can be calculated by the equations (9) and (10).
