River Gate Control for Fish Overwintering Habitat
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Solution Overview
Problem
Hydraulic engineering in rivers has resulted in shallow water depths in fish overwintering areas, posing a threat to fish survival during winters due to inadequate water depth, which existing river management practices fail to address.
Innovation Solution
A method to control river gates based on habitat requirements for fish overwintering, involving the collection of fish resources, screening of target species, establishing temperature-water level relationships, and using a hydrodynamic model to manage water depth and discharge, ensuring a minimum tolerable water temperature for fish survival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic engineering is built to meet social and economic development needs, then productivity and energy supply are improved, but water depth in fish overwintering areas decreases, threatening fish survival
Solution Approach 1:
The patent changes the operational parameters of the hydraulic structure by establishing ecological flow standards and implementing scheduled discharge regimes that maintain minimum water depths in fish overwintering areas. The system adjusts discharge volumes and timing to preserve thermal habitats while meeting energy production requirements
Solution Approach 2:
The patent implements dynamic gate control mechanisms that adjust water release in real-time based on seasonal fish habitat requirements. The system transitions from static operational modes to dynamic regulation that responds to ecological conditions, particularly maintaining adequate water depths during fish overwintering periods
2Reliability
If gate discharge is increased to maintain water depth in overwintering areas, then fish habitat conditions are improved, but energy generation and runoff utilization are reduced
Solution Approach 1:
The patent implements periodic gate operation schedules that align with fish life cycle requirements. Discharge is intensified during critical periods such as overwintering and spawning seasons, then reduced during periods when fish habitat requirements are less stringent, creating a rhythmic operational pattern that balances ecology and energy production
Solution Approach 2:
The patent employs preliminary ecological assessments and predictive modeling to determine optimal discharge schedules before critical fish habitat periods begin. The system proactively adjusts gate operations in advance of seasonal transitions to ensure habitat requirements are met before ecological stress occurs
Data Source
AI summary
A method for controlling the gate based on the habitat requirement for fish overwintering in rivers. According to the characteristics of biological habitat of the river and the habitat demand of fishes during overwintering, the method specifically comprises the steps of: firstly, determining candidate fishes for ecological flow calculation though fish resources investigating and historical data, and then screening out the target fish by adopting hierarchical analysis method; Secondly, establishing a quantitative response relationship curve between target fish physiological adaptions and water temperature, obtaining ecological water level which ensures the target fish overwintering safely according to the vertical temperature distribution, and establishing the relation between water depth and discharge using hydrodynamic model; finally, setting up a gate control system including a radar water level meter in the overwintering areas and an ecological water level management system in a gate control room.