Impacts of hydropeaking: A systematic review

Hydropower is often viewed as a renewable energy alternative. However, its ecological impacts are not fully understood. Current research shows that hydropeaking—rapid flow fluctuations from hydropower—disrupts river ecosystems. Prior studies have documented effects on flow patterns and aquatic life. Yet, the full scope of these impacts remains unclear. No consensus exists on quantifying ecosystem services or cumulative effects. This uncertainty limits effective policy and management. The need for systematic synthesis is clear. A review of existing literature can clarify these issues.

This study aims to consolidate current knowledge on hydropeaking's ecological effects. It addresses the lack of a comprehensive synthesis in the field. The authors seek to identify key impacts and unresolved questions. By compiling 155 relevant studies, they provide a structured overview. The review follows PRISMA guidelines for transparency. It focuses on aquatic and terrestrial ecosystem responses. The goal is to highlight areas needing further research. This approach supports informed decision-making in energy and conservation.

The team used a systematic review approach following PRISMA guidelines. They searched databases up to November 2023 for relevant studies. Inclusion criteria ensured focus on hydropeaking impacts. Studies were screened for relevance and quality. Data extraction focused on ecological effects and knowledge gaps. The review categorized findings by ecosystem type and impact. A narrative synthesis organized the results thematically. This method ensures a transparent and replicable process.

Hydropeaking alters flow patterns, water temperature, and sediment dynamics. These changes affect fish growth, behavior, and migration. Benthic macroinvertebrates also show disrupted communities. Habitat fragmentation and erosion are additional consequences. Riparian vegetation loss impacts terrestrial ecosystems. Dissolved gas fluctuations further stress aquatic life. The review highlights limited data on long-term effects. Cumulative impacts remain poorly quantified in current literature.

The authors emphasize the need for more research on long-term ecological effects. They note a lack of consensus on quantifying ecosystem services. Hydropeaking's cumulative impacts remain poorly understood. The review identifies gaps in soil moisture and energy production trends. These findings suggest a need for interdisciplinary studies. Policy development should consider these uncertainties. Balancing energy production and ecosystem health is crucial. Future research must address these unresolved questions.