Slope-changing type fish swimming capacity testing water tank

Abstract

The invention discloses a slope-changing type fish swimming capacity test water tank. The tank comprises an open type water tank body, wherein one end of the tank body is communicated with an energy dissipation tank, an outlet of the other end of the tank body is provided with a tail door which can be opened and closed in a turnover mode, a bottom surface of middle of the tank body is supported bya T-shaped reversing support, two ends of the tank body vertically swing by taking the T-shaped reversing support as a fulcrum, the bottom of the tank body is supported by the same number of movableends of an elevator on both sides of the T-shaped reversing support, a wall of the tank body is fixedly installed with water level gauges, the water level gauges are arranged equidistantly along the length of the tank body, an upper part of the tank body is movably equipped with a flow meter and two fish blocking nets, the flow meter and the fish blocking net can move along the longitudinal direction of the tank body, and the two fish blocking nets enclose a space for fish to move in the tank body. A water pump pumps water from an underground water tank and then enters the energy dissipation tank through a water inlet pipe, the water flows stably and then flows into the tank body, the water discharged through the tank body and the tail gate circulates back to the underground water tank through a pipeline, and a electromagnetic flowmeter is further installed on the water inlet pipe. The device can be used for testing large individual fishes, and can conduct swimming capacity experimentsin a state close to natural pressureless 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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