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A framework for impact analysis of small hydropower on river ecological integrity
Xintong Li1, Yuanming Wang2, Wouter Buytaert3
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China; Department of Civil and Environmental Engineering, Imperial College London, London, UK.
Water Research
|June 25, 2025
Summary
Small hydropower development significantly degrades river ecological integrity in mountainous regions. This study quantifies impacts on hydrological, habitat, and biological factors, offering insights for conservation.
Area of Science:
- Environmental Science
- River Ecology
- Hydropower Engineering
Background:
- Small hydropower development pressures river ecosystems, impairing ecological integrity and ecosystem services in mountainous regions.
- Existing legislation lacks quantitative frameworks for assessing hydropower impacts on river ecological integrity.
- Understanding interdisciplinary mechanisms for maintaining river ecological integrity is crucial.
Purpose of the Study:
- To develop and apply a quantitative assessment framework for evaluating the ecological integrity of rivers impacted by small hydropower.
- To analyze the specific impacts of small hydropower on hydrological, habitat, and biological dimensions of river ecosystems.
- To provide insights for mitigating the negative effects of hydropower development on riverine environments.
Main Methods:
- Conceptualized river ecological integrity using hydrological, habitat, and biological dimensions.
- Identified 10 hydrological, 7 habitat, and 17 biological indicators for assessment.
- Established comprehensive integrity indexes and applied them to a case study river impacted by small hydropower.
Main Results:
- Ecological integrity was significantly degraded following small hydropower development.
- Hydrological, habitat, and biological integrity indexes declined by 48%, 73%, and 8% respectively in water-reduced sections.
- Extreme flow events, flow dynamics, connectivity, hydrodynamics, riparian conditions, and species composition (algae, macroinvertebrates, fish) were key indicators.
Conclusions:
- Small hydropower development poses a substantial threat to river ecological integrity in mountainous areas.
- The developed quantitative framework effectively assesses hydropower impacts across multiple ecological dimensions.
- Findings offer critical data for informed river management and conservation strategies to address human-induced ecological degradation.
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