摘要:
The present invention comprises a fish guidance rack (2) for use in a fish guidance system in a watercourse (W) at a run-of-river hydropower plant or a water intake. The rack comprises a series of vertical bars (1) mounted on a rack frame (7) along a longitudinal axis (L) of the rack between a first end (5) of the rack and a second end (6) of the rack. The rack comprises bars with a hydrodynamic curved form, and a generally increasing inter-bar spacing (sb) in the downstream direction.
摘要:
Transporter and fish lock including an upper inlet and an upper outlet adapted to be in flow communication with an upper volume of water, and a lower outlet and a lower inlet adapted to be in flow communication with a lower volume of water. The upper inlet and the lower outlet communicate via a downstream passage having a first effective through-flow area, and the lower inlet and the upper outlet communicate via an upstream passage having a second effective through-flow area. The downstream passage includes a first helical rotor having a thread-direction that by a flow directed downstream causes the first rotor to rotate around its axis. The upstream passage includes a second helical rotor, wherein the rotors are mutually connected such that the first rotor drives the second rotor in rotation around its axis, and the second rotor has a thread-direction that upon rotation generates a flow directed upstream.
摘要:
A fish screen is presented having a porous surface made of two or more corrugations (e.g., elongated convex shapes) having an at least partially porous surface. The incorporation of a porous area on the corrugations allows increasing the total porous surface area compared to an underlying diversion area. The porous area is a magnification of an underlying diversion area, which reduces the fluid pressure (e.g., impingement forces) acting on the porous area of the screen. The valley between each pair of corrugations is solid, not porous. The solid valley(s) provide two important functions; they provide multiple small solid surface flow channels over the screen surface. These solid channels protect small or weak swimming aquatic organisms from impingement on the screen. That is, once organisms reach the solid channel, they may move along the solid channel free of impingement until they reach the edge of the screen.
摘要:
Devices and methods are disclosed for repelling elasmobranchs with high-pull-force magnets, including devices and methods for reducing by-catch in commercial fisheries and protecting humans from attacks by elasmobranchs.
摘要:
A mobile electric field monitor with a floatable housing, an electric field probe, and a computer processor to measure the electric field generated by an electrofisher while the electrofisher is being used in a body of water, this mobile electric field monitor is coupled to computing system to generate a three dimensional map of electric field.
摘要:
A method and apparatus for separating fish and debris from water, the apparatus being made up of a frame member within which a rotating drum member is mounted, the drum member containing circumferentially mounted, longitudinally extending chamber members with an open side, and an air distribution member for inducing air into the chambers, facilitating rotation of the drum member. The method and apparatus are conformable for use in areas where the flow of water is a concern.
摘要:
A structure for diverting fish away from water intakes comprises a porous dike having a bottom portion, a central portion, and a top portion, the top portion preferably being submerged a short distance below the surface, and the central portion having flow passages. In a preferred embodiment, the top and bottom portions comprise solid blocks and the flow passages in the central portion are lined with zebra mussel resistant sleeves to minimize clogging. Preferably the sleeve can be readily replaced as desired.
摘要:
A method for enhancing or generating a water flow current by the generation of a velocity head differential, to guide fish, including: a venturi eductor to induce higher water pressures; a pump, piping or other motive water source; an adjustable frame to mount the venturi eductor; and a method of using this equipment. Fish may be guided into or away from a waterway area by generating or enhancing a current to guide them. The apparatus may be used as a method to guide fish through low velocity areas of a river, lake, reservoir or other waterway. The apparatus may also be used as a method to create water flow velocities that fish are reluctant to pass through for a barrier or curtain to further guide the fish. The apparatus and method may also be used to transfer temperature-variant water in a waterway.
摘要:
A method of deterring fish from an underwater area includes creating a zone of turbulence along the underwater area, providing a visual deterrence to the fish within the zone, and producing a predefined level of frequency sounds along the zone of turbulence.
摘要:
A screened water or fluid diversion having a screen that is disposed in a generally horizontal manner (i.e., more horizontal than vertical, and substantially parallel to the direction of flow over the screen). Various representative embodiments are disclosed. Downstream flow control preferably maintains a head profile or grade line above the level of the screen and a uniform flow transition chamber (UFTC) or like structure is preferably coupled to the screen to facilitate more even and distributed flow through the screen (the diverted flow). In an embodiment that provides safe passage of fish, the grade line is provided sufficiently above the screen to provide safe fish passage. Various screen configurations, downstream flow control, UFTC configurations and other design considerations are disclosed.