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- W4379162605 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Reservoirs can emit substantial amounts of the greenhouse gas methane (CH<sub>4</sub>) via different emission pathways. In some reservoirs, reservoir flushing is employed as a sediment management strategy to counteract growing sediment deposits that threaten reservoir capacity. Reservoir flushing utilizes the eroding force of water currents during water level drawdown to mobilize and transport sediment deposits through the dam outlet into the downstream river. During this process, CH<sub>4</sub> that is stored in the sediment can be released into the water and degas to the atmosphere resulting in CH<sub>4</sub> emissions. Here, we assess the significance of this CH<sub>4</sub> emission pathway and compare it to other CH<sub>4</sub> emission pathways from reservoirs. We measured seasonal and spatial CH<sub>4</sub> concentrations in the sediment of Schwarzenbach Reservoir, providing one of the largest datasets on CH<sub>4</sub> pore water concentrations in freshwater systems. Based on this dataset we determined CH<sub>4</sub> fluxes from the sediment and estimated potential CH<sub>4</sub> emissions due to reservoir flushing. CH<sub>4</sub> emissions due to one flushing operation can constitute 7–14 % of the typical annual CH<sub>4</sub> emissions from Schwarzenbach Reservoir, whereby the amount of released CH<sub>4</sub> depends on the timing of the flushing operation within the season. The larger the thickness of the sediment layer mobilized during the flushing operation the larger the average CH<sub>4</sub> concentration per unit volume of flushed sediment. This suggests that regular flushing of smaller sediment layers releases less CH<sub>4</sub> than removal of the same sediment volume in fewer flushing events of thicker sediment layers. In other reservoirs with higher sediment loadings than Schwarzenbach Reservoir, reservoir flushing could cause substantial CH<sub>4</sub> emissions, especially when flushing operations are conducted frequently. Therefore, CH<sub>4</sub> emissions due to reservoir flushing must be included in estimates of annual overall greenhouse gas emissions from reservoirs that are subject to regular flushing operations." @default.
- W4379162605 created "2023-06-03" @default.
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- W4379162605 date "2023-06-02" @default.
- W4379162605 modified "2023-10-06" @default.
- W4379162605 title "Reply on RC2" @default.
- W4379162605 doi "https://doi.org/10.5194/egusphere-2023-422-ac2" @default.
- W4379162605 hasPublicationYear "2023" @default.
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