A fish pass simulation method based on individual model

A simulation method and individual technology, applied in ecological hydraulics simulation, predicting the simulation field of fish passing through low-head fishways during upward migration, and can solve the problems of predicting the effect of fish passing in fishways and the difficulty of predicting the effect of passing fish

Active Publication Date: 2020-02-14
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to break through the technical bottleneck that the effect of passing fish in the fishway is difficult to predict, the method can simulate the upward tracing process of fish groups in the fishway according to the response relationship of fish to changes in water flow, combined with the swimming behavior and swimming ability of fish, and solves the problem of The problem of predicting the effect of passing fish in the fishway

Method used

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  • A fish pass simulation method based on individual model
  • A fish pass simulation method based on individual model
  • A fish pass simulation method based on individual model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment is a fishway simulation method based on individual models, such as figure 1 shown.

[0047] In this embodiment, a research method combining fish behavior experiments with a two-dimensional hydraulic model is used to simulate the process of fish passing through the fishway.

[0048] The concrete steps of described method are as follows:

[0049] Step 1, the step of obtaining fish swimming ability data: Obtain the critical swimming speed of the target fish passing through the fish pass through indoor experiments and relative critical swimming speed .

[0050]

[0051] in, is the critical swimming speed, is the relative critical swimming speed, BL is the fish body length.

[0052] The indicators of fish swimming behavior characteristics mainly include critical swimming speed, which reflects the long-term swimming ability of fish, and is an important indicator for designing the mainstream of fishway ponds and determining the distance between p...

Embodiment 2

[0114] This embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment on the determination of the critical swimming speed. The assay method of the critical swimming speed of the target fish described in the present embodiment comprises the following sub-steps:

[0115] Conduct critical swimming speed pre-test: select one fish and place it in the experimental area of ​​the critical swimming speed tank, and increase the speed by 0.4 every 2 minutes on the basis of adapting to the initial flow rate of the critical swimming speed tank. BL / s Increase the speed of the water flow until the experimental fish is fatigued, record the water flow rate that causes the experimental fish to be fatigued, and it is the critical swimming speed of the target fish U crit The estimated value of , where BL is the body length of the experimental fish; this sub-step uses at least three fish to repeat the experiment three times, and takes the average value of ...

Embodiment 3

[0125] This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the method for obtaining the flow rate of flow in the above-mentioned embodiment. The acquisition method of the flow tendency rate described in this embodiment is as follows:

[0126] The flow rate experiment was carried out in a conventional rectangular water tank, and the size of the flow rate tank was 8m×0.4m. In the experimental area, a measurement section was set every 0.7 m along the water flow direction, and 30 measurement points were set for each section, and the flow velocity was measured with a current meter.

[0127] Set at least 8 flow rate gradients in the flow rate tank; put 1 fish in each experiment, and measure at least 8 fish under each flow rate condition; put a single experimental fish in the experimental area before the experiment, and adapt to static water for 1 hour;

[0128] Adjust the flow rate, and adjust the flow rate to the target flow rate within 5 mi...

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Abstract

The invention relates to an individual mode-based fishway fish passing simulation method. The individual mode-based fishway fish passing simulation method comprises the following steps: acquiring fishswimming ability data; acquiring fish rheotaxis frequency data; acquiring fish hobby flow speed data; establishing a simulated fishway hydrodynamic model; establishing an individual mode-based fish motion mathematical model; and acquiring fish upstream passing fishway process. According to the individual mode-based fishway fish passing simulation method, the effect of fish upstream passing fishway in the fishway is predicted, the fishway hydrodynamic model is established, the flow field frequent change condition in the fishway is simulated, the fish individual swimming ability, rheotaxis frequency and hobby flow speed range are acquired according to experiments, an individual mode-based fish motion model id established on the basis, motion of the fish individuals in the flow field is simulated, the model is coupled with the fishway hydrodynamic model, motion simulation of the fish individuals in the fishway is realized, basis is provided for estimation on the fishway fish passing effect, and prediction on the fishway fish passing effect is realized by the established mathematic model in an intuitive mode.

Description

technical field [0001] The invention relates to a fish passage simulation method based on an individual model, which is an eco-hydraulic simulation method, and a simulation method suitable for predicting the process of fish passing through a low water head fish passage during upward migration. Background technique [0002] Fishways are artificial waterways built in water conservancy projects for fish to migrate. The most direct impact of water conservancy projects on fish resources is to block the migration channels of fish, restrict the use of fish habitats such as spawning grounds, nursery grounds, and wintering grounds, and make them unable to effectively complete their life cycle. , threatening the anadromous reproduction of migratory fish and intrapopulation gene exchange of non-migratory fish. The construction of water conservancy projects has seriously affected the migration, population structure, and resource volume of fish. The establishment of fish passing facilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B1/02E02B8/08G06F30/13G06F30/23
CPCE02B1/006E02B1/02E02B8/08Y02A40/60
Inventor 韩瑞陈求稳吴一红赵懿珺穆祥鹏李若男石小涛陈端段亚飞
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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