三峡水库调度对香溪河库湾水体溶存甲烷时空分布的影响

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Abstract This study took Xiangxi Reservoir Bay, a typical tributary of Three Gorges Reservoir, as an example to evaluate impacts of Three Gorges dam operations on spatiotemporal variations of dissolved CH₄concentration during the drainage and impoundment periods. Results show that the dissolved CH₄concentrations were (0.41±0.54) and (0.50±0.66) μmol/Lin drainage and impoundment period, respectively, with a large spatiotemporal variation-higher concentrations in the upstream than in the downstream. The dam operation regulated how the mainstream water went to the reservoir bay through the hyperpycnal flow, which could alter the stratification of the water body and thus affect the spatiotemporal variability of dissolved CH₄. At the same time, the dilution of the mainstream water would also directly reduce the dissolved CH₄ concentration in the reservoir bay due to its lower dissolved CH₄ concentration. In addition, the dam operation would have an indirect impact on the CH₄ production and consumption in the reservoir bay, and the underlying mechanisms still need to be further explored.

Key words： Three Gorges Reservoir Xiangxi Bay methane spatiotemporal variations

Received: 14 October 2022

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X511

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	LIU Jia
	HU Jie-ming
	ZHENG Xiang-wang
	KANG Man-chun
	MENG Jiang-huai
	XIAO Shang-bin

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LIU Jia,HU Jie-ming,ZHENG Xiang-wang等. Effects of Three Gorges Reservoir operation on tempo-spatial distribution of dissolved methane in Xiangxi Reservoir Bay[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2508-2518.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2508

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