The 24th IAHR-APD Congress (24th IAHR-APD Congress)

69 / 2023-12-29 10:56:36

Impact of Sediment Deposition in the Three Gorges Reservoir on the Spatiotemporal Distribution of Dissolved Methane Concentration

Three Gorges Reservoir,Sediment Deposition,Dissolved Methane,Spatiotemporal Distribution

This study aims to investigate how sediment Deposition in the Three Gorges Reservoir affects the spatiotemporal distribution of dissolved methane concentration in water. The Three Gorges Reservoir, a critical water resource in China, has undergone significant changes in water and sediment conditions and reservoir sedimentation due to a series of water and hydropower developments along the upper reaches of the Yangtze River. Understanding the impact of sediment Deposition on dissolved methane concentration is crucial for comprehending its ecological consequences and formulating effective environmental management strategies. This study addresses several key issues. Firstly, it explores the relationship between dissolved methane concentration and water-sediment conditions at different spatiotemporal scales. Secondly, it analyzes the mechanisms of changes in dissolved methane concentration by examining sediment deposition forms at typical cross-sections. Thirdly, the research aims to assess potential environmental risks associated with the increase in methane concentration, including its impact on aquatic ecosystems and water quality. Finally, it proposes mitigation measures for controlling methane emissions from reservoirs affected by sedimentation. To achieve these goals, a multidisciplinary approach was employed. Sediment and water samples were collected at various locations and time intervals in the Three Gorges Reservoir. Laboratory analyses, including sediment particle size analysis and hydrochemical measurements, were conducted to quantify sediment particle size distribution and dissolved methane concentration. Additionally, a long-time series of water and sediment data, along with reservoir sedimentation information, were integrated to establish the relevant relationship between water body dissolved methane concentration and analyze factors influencing the spatiotemporal distribution of dissolved methane in the Three Gorges Reservoir. The study concludes that sediment Deposition significantly influences the spatiotemporal distribution of dissolved methane concentration in the Three Gorges Reservoir. Methane release from sediment is a complex process influenced by various environmental factors. This study provides valuable insights into understanding the mechanisms of methane dynamics, enhancing comprehension of ecological consequences. The results underscore the importance of considering sediment management strategies in reservoir ecosystems to mitigate potential environmental risks associated with increased methane concentration. The study contributes to a broader understanding of the interaction between freshwater reservoir sediment dynamics and methane cycling, laying a foundation for sustainable water resource management practices.