A variable slope type fish swimming ability test tank

Abstract

The invention discloses a water tank for testing the swimming ability of fish with variable slope, which includes an open tank body, one end of which is connected to an energy dissipation pool, and a tailgate that can be flipped and opened and closed is installed at the outlet of the other end, and the bottom surface of the middle part of the tank body is formed by T Type reversing support support, the two ends of the tank swing up and down with the T-shaped reversing support as the fulcrum, the bottom of the tank body is supported by the movable ends of the same number of elevators on both sides of the T-shaped reversing support, and the tank body The longitudinal direction of the tank body is equidistantly arranged. The upper part of the tank body is movable with a current meter and two fishing nets. The current meter and the fishing net can move along the longitudinal direction of the tank body. The two fishing nets surround the tank body for fish to swim. space. The water pump pumps water from the underground pool and enters the energy dissipation pool through the inlet pipe. After the water flow is stable, it flows into the tank body. The water discharged through the tank body and tailgate circulates back to the underground pool through the pipeline. An electromagnetic flowmeter is also installed on the water inlet pipe. The device can test large individual fish, and can carry out swimming ability experiments in a state close to natural unpressurized flow.

Description

technical field [0001] The invention relates to the technical field of fish passing facilities, in particular to a slope-changing fish swimming ability testing water tank. Background technique [0002] The swimming ability of fish is the basic behavioral indicator for the design of fish passing facilities. The tank test is the most direct and quantitative test method, and it is widely used. The existing fish swimming ability test tank has small volume, closed test section, and the water body is a pressurized flow (CN202979896U / CN206150174). Because it is a closed device, it can only test small-sized fish, and it is the same as that of natural water bodies. There are differences in pressurized water bodies, which cannot fully reflect the swimming behavior indicators of fish in the natural state. Or the open-type unpressurized flow test water tank (CN206629782 U) that adopts fixed gradient also can not solve following two types of problems: 1) under different flow rate workin...

AI Technical Summary

Problems solved by technology

The existing fish swimming ability test tank has small volume, closed test section, and the water body is a pressurized flow (CN202979896U / CN206150174). Because it is a closed device, it can only test small-sized fish, and it is the same as that of natural water bodies. There are differences in pressurized water bodies, which cannot fully reflect the swimming behavior indicators of fish in their natural state

Or the open-type unpressurized flow test water tank (CN206629782 U) that adopts fixed gradient also can not solve following two types of problems: 1) under different flow rate working conditions, the depth of water of tank water body is also different, it is difficult to accurately split two indexes to fish swimming. 2) According to the principle of hydraulics, the uniform flow in open channels is the flow when gravity and resistance are in balance, and its kinetic energy remains unchanged, while the head loss comes from the reduction of potential energy

For this reason, in the case of constant bottom slope, a uniform flow body with a flow rate of a tank corresponds to a slope, so except for the flow rate condition corresponding to uniform flow, the flow velocity and water level line of other flow rate conditions will change along the course, causing fish When species move in different sections of the tank, the corresponding flow velocity and water level are different, and the swimming speed index of fish cannot be accurately quantified

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