Ecological daily flow variation regulation and control method for river reach based on suitable habitat overlap of fishes

By drawing a map of the benchmark flow-regulated flow increment-fish suitable overlap rate distribution, combining two-dimensional hydrodynamic model and fish reproduction suitability cloud map, quantitatively evaluating the flow change amount, solving the problem of unquantitative flow change in the existing technology, achieving fine regulation of fish reproduction, and promoting the sustainable development of hydropower.

WO2025152709A1 Publication Date: 2025-07-24CHINA RENEWABLE ENERGY ENG INST +2
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Patent Information

Application Number
PCT/CN2024/140789
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-01-16
Filing Date
2024-12-20
Publication Date
2025-07-24

AI Technical Summary

Technical Problem

The existing technology lacks quantitative research on the flow changes per unit time of fish breeding period, which leads to the inability to describe the daily flow changes in the river section ecologically, affecting the effect of hydropower station scheduling on the aquatic ecology and fish breeding in the river section.

Method used

By drawing a distribution map of the benchmark flow-regulated flow increment-fish suitable overlap rate, combining the two-dimensional hydrodynamic numerical model and the fish breeding suitability cloud map, quantitatively assessing the overlap rate of the suitable egg spawning areas of fish at different flow changes under different benchmark flow rates, and determining the constraint value of the ecological flow change in the river section.

Benefits of technology

It has achieved strong adaptability and high practicality for fish of different research sections and different egg-laying properties, effectively reducing the adverse impact of hydropower station dispatch on the aquatic ecology and fish reproduction of river sections, and promoting the sustainable and high-quality development of hydropower.

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Abstract

The present invention provides an ecological daily flow variation regulation and control method for a river reach based on a suitable habitat overlap of fishes. The method comprises: drawing a distribution diagram of reference flows, regulated and controlled flow increments, and suitable overlaps of fishes; and obtaining a daily flow mean value of the current day as a reference flow, searching for the distribution diagram to obtain a regulated and controlled flow increment range of which a suitable overlap of fishes is greater than a preset value, and using the sum of the reference flow and the regulated and controlled flow increment range as a flow regulation and control range of the next day. According to the present invention, quantitative assessment of suitable overlaps of fishes in the spawning areas under different reference flows and different flow variations are carried out, and then the constraint value of the ecological flow variation of a river reach is obtained. The method is applicable to different research river reaches and fishes having different spawning properties, has good adaptability and high practicability, can effectively reduce the adverse effects of scheduling and operation of hydropower stations on aquatic ecology of river reaches and fish reproduction, and promotes continuous high-quality development of hydropower.
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