Annular Water Tank for Fish Spawning Flow Simulation
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Solution Overview
Problem
Current experimental methods lack the capability to study the quantitative relationship between spawning behaviors of large parent fish and flow velocity stimulation, as existing devices are not suitable for simulating the complex flow conditions required by parent fish of Chinese carps, which are crucial for understanding spawning mechanisms.
Innovation Solution
An annular water tank system combining arc-shaped and special-shaped tanks to create varying flow velocities and patterns, allowing for the simulation of natural river conditions, with specific design features such as inclined walls and baffles to generate complex flow fields and separate flow pushers from fish, enabling the study of spawning behaviors at different velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a large-size water tank is used to accommodate parent fish of Chinese carps (body length 0.6m to 1m), then the fish can exhibit natural spawning behaviors, but it becomes difficult to construct suitable flow velocity distribution and diverse flow patterns throughout the tank
Solution Approach 1:
The water tank is divided into multiple functional zones including a flow generation zone with water flow pushing equipment, a spawning zone with appropriate flow velocity for spawning behavior, and a rest zone with lower flow velocity. This segmentation allows different flow patterns to be created in different regions of the large tank, accommodating both the size requirements for natural fish behavior and the complexity of flow field construction.
2Speed
If water flow pushing equipment is placed directly in the water tank to generate flow velocity, then the required flow velocity range (1.0m/s to 1.65m/s) can be achieved, but the equipment may interfere with or harm the fish
Solution Approach 1:
A flow guide structure acts as an intermediary between the water flow pushing equipment and the fish. The equipment generates the required flow velocity in the flow generation zone, and the flow guide structure channels this flow toward the spawning zone while filtering out harmful turbulent components. This intermediary structure allows the equipment to operate at optimal velocities without directly exposing fish to harmful flow patterns or equipment components.
3Ease of manufacture
If the water tank design is simplified for ease of construction, then manufacturing cost and complexity are reduced, but it becomes difficult to simulate the complex flow conditions required for spawning of parent fish
Solution Approach 1:
The water tank employs local quality differentiation where different sections have different structural characteristics optimized for their specific functions. The flow generation zone has a structure optimized for equipment installation and flow generation, the spawning zone has a structure optimized for natural spawning behavior, and the rest zone has a simpler structure. This allows the overall tank to be relatively simple to construct while specific local areas provide the complex flow conditions needed for spawning simulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The experimental device effectively simulates spawning conditions for parent fish, providing a scientific basis for ecological operations by allowing the study of spawning behaviors at specific flow velocities, enhancing our understanding of the relationship between flow velocity and spawning, and improving reproduction outcomes for Chinese carps.
Implementation Method 1
water flow pushing equipment capable of enabling the maximum water flow velocity in the water tank to reach a preset value are respectively placed in the first special-shaped water tank and the second special-shaped water tank
Data Source
AI summary
A experimental device is specifically an annular water tank formed by a first arc-shaped water tank, a first special-shaped water tank, a second arc-shaped water tank and a second special-shaped water tank which are sequentially connected head to tail, and the outer perimeter is 70 m to 110 m, wherein the inner walls of both the first special-shaped water tank and the second special-shaped water tank are flat, both of the widths between the outer walls and the inner walls are gradually increased from the two ends to the middle, and water flow pushing equipment which are capable of enabling the maximum water flow velocity in the experimental device to reach a preset value are respectively placed in the first special-shaped water tank and the second special-shaped water tank.