Pool Head and Tail Fishway for Water Level Adaptation
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Solution Overview
Problem
Existing fishways face challenges in balancing flow regulation with ensuring suitable fish passage conditions, leading to complex designs and difficulty in standardization due to varying hydrological conditions.
Innovation Solution
A fishway design incorporating a pool head and pool tail with dual-control gates and steep-slope fishways to adapt to upstream and downstream water level variations, maintaining optimal water depth for fish passage and regulating flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gates are installed at the entrance and exit of the fishway to regulate flow and water depth, then flow control capability is improved, but localized high flow velocities or chaotic water flow conditions occur when gates are partially opened, seriously affecting fish passage effectiveness
Solution Approach 1:
The fishway is divided into multiple sections with separate gate control mechanisms. The entrance gate and exit gate can be independently controlled, allowing different sections to have different flow conditions. This segmentation enables flow regulation while avoiding chaotic water flow patterns that would occur with single-point control, thereby maintaining fish passage effectiveness.
Solution Approach 2:
The gates are designed with dynamic control capabilities, allowing them to adjust opening degrees based on real-time water level and flow conditions. The system can transition between different operating states (fully open, partially open, fully closed) smoothly, preventing sudden changes in flow velocity and avoiding chaotic water flow patterns while maintaining effective flow control.
2Reliability
If gates are fully open during fishway operation to ensure fish passage, then fish passage effectiveness is improved, but the longitudinal structural dimensions of the fishway are determined by upstream water level variations and downstream water level variations, making the design and construction complex and standardization difficult
Solution Approach 1:
The fishway design incorporates adjustable parameters including gate opening degrees, water depth, and flow velocity that can be modified based on hydrological conditions. By changing these parameters dynamically rather than fixing structural dimensions, the fishway maintains effective fish passage across different water levels while avoiding complex structural designs. The longitudinal dimensions are standardized with adjustable operational parameters.
3Adaptability or versatility
If the fishway structure is designed to adapt to varying hydrological conditions, then adaptability is improved, but the design and construction become complex and standardization is difficult to achieve
Solution Approach 1:
The fishway is designed with universal structural dimensions that can accommodate various hydrological conditions through operational adjustments rather than structural changes. The same standardized structure serves multiple functions across different flow regimes by adjusting gate positions and water depth, eliminating the need for complex adaptive structures while maintaining high adaptability to varying hydrological conditions.
Data Source
AI summary
The present application discloses a fishway with a pool head and pool tail in the field of fishway technology. The fishway includes a pool head, a main fishway, and a pool tail arranged sequentially from an upstream to a downstream. The main function of the pool head and the pool tail is to adapt to the fluctuation of the upstream and downstream water levels, so as to avoid the impact of the upstream and downstream water level changes on the main fishway. To achieve the above purpose, an upstream maintenance gate, a double-gate and dual-control working gate (dual control refers to flow control and fish passage effect control), an upstream steep-slope fishway, and fish guiding facilities are set at the pool head. A downstream steep-slope fishway, a water replenishment channel, and a downstream maintenance gate are set at the pool tail.