Modelling the hydraulic characteristics of diaphragm fishways and the effects on fish habitats

Diaphragm fishways are often used in fishway engineering construction. Although there an increasing number of new types fishways, other diaphragm can be derived from the combination or evolution following three basic fishways: vertical slot, overflow weir and orifice. To compare hydraulic characteristics different foundation operations slot orifice calculated by numerical simulation, we comprehensively flow field application scenarios various two dimensions characteristics. This paper analyses field, such as velocity distribution turbulent kinetic energy, aspects applicable flow, favourite swimming speed range, explosive speed, fish passing position, matching typical target fish. It is concluded that widely applied to species due its own advantages, less impact environmental conditions. The need analysed with fishway, ability natural