Fish Migration Slot Pass with Variable Width and Roughness
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Solution Overview
Problem
Conventional fish migration systems face issues such as high water requirements, reduced electricity generation, high flow velocities, turbulence, and large space requirements, leading to increased operating costs and restricted fish passage, especially for weak swimmers.
Innovation Solution
The proposed fish migration system incorporates slot passes with varying widths and roughness elements, designed to minimize water flow while maintaining high passability, using hydraulic losses, friction losses, and deflection losses to reduce water throughput and space requirements, allowing for efficient fish migration across large height differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional migration systems are used, then fish migration is enabled, but water flow requirement increases and electricity generation decreases
Solution Approach 1:
The patent changes the hydraulic parameters of the migration system by introducing roughness elements that increase flow resistance, thereby reducing water flow requirements while maintaining fish passage capability. This allows the system to enable fish migration with minimal impact on electricity generation.
2Reliability
If conventional migration systems are used, then fish migration is enabled, but flow velocity and turbulence increase
Solution Approach 1:
The patent modifies flow parameters by introducing roughness elements that increase flow resistance and reduce flow velocity. This creates calmer water conditions while maintaining sufficient flow for fish migration, thereby reducing turbulence and improving passability for weak swimmers.
3Reliability
If conventional migration systems are used, then fish migration is enabled, but space requirement and construction cost increase
Solution Approach 1:
The patent changes the geometric parameters of the migration system by optimizing slot dimensions and adding roughness elements that increase flow resistance. This allows the system to achieve fish passage in a more compact configuration, reducing space requirements and construction costs while maintaining migration effectiveness.
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
This design achieves low water flow rates and high fish passability, reducing operational costs and space needs, enabling effective fish migration across varying water levels while maintaining laminar flow, thus supporting ecological restoration of water bodies.
Implementation Method 1
The slot 5 has a slot length 51—measured in the slot flow direction 4—which slot length 51 is between 20% and 80%, in particular 40% to 75%, preferably 50% to 70%, of the first width 80
Implementation Method 2
roughness elements, for example wall roughness and/or base roughness elements, can be formed in the slot, with the hydraulic flow loss at the slot being able to be particularly high due to a composite effect of the roughness elements with one another and with the slot width and/or the slot length
Implementation Method 3
The variation of the slot width can be formed by the wall roughness elements, in particular by elevations and/or depressions
Implementation Method 4
roughness elements, for example wall roughness and/or base roughness elements, can be formed in the slot, with the hydraulic flow loss at the slot being able to be particularly high due to a composite effect of the roughness elements with one another and with the slot width and/or the slot length
Implementation Method 5
the flow in the slot is essentially laminar, so that the organism migration system exhibits a particularly high level of organism passability
Data Source
Figure 1~4
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Figure 8~13
AI summary
The organism migrant system (1) is formed with a primary length, primary width (80) and primary height. Two slit passes (2) and a reservoir (3) are provided along the primary length. A slit (5) is provided, which has a slit length (51). The slit length amounts between 20 and 80 percentage of the primary width, and the slit has a variable slit width.