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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摘要以三峡水库典型支流香溪河库湾为研究对象,在泄水期和汛期开展表层和垂向水体溶存甲烷浓度的高分辨率监测,探讨水库调度对香溪河库湾溶存甲烷时空分布规律的影响.结果表明,泄水期和蓄水期库湾溶解甲烷浓度分别为(0.41 ± 0.54)和(0.50 ± 0.66) μmol/L,呈现上游高下游低,表层低底层高的空间分布特征,且呈现出极强的空间差异.水库调度促使干流水体通过异重流进入库湾,改变了水体分层状态,也改变了库湾内溶存甲烷的时空差异;同时干流水体的稀释作用,还将直接降低库湾水体甲烷浓度.此外,水库调度对库湾甲烷产生,消耗将产生间接影响,其潜在机制还需进一步探讨.

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	刘佳
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	孟江槐
	肖尚斌

关键词 ：三峡水库, 香溪河库湾, 甲烷, 时空分布

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

收稿日期: 2022-10-14

PACS:

X511

基金资助:国家自然科学基金资助项目(51979148)

通讯作者: 肖尚斌,教授,shangbinx@163.com E-mail: shangbinx@163.com

作者简介: 刘佳(1993-),男,四川眉山人,博士后,主要从事水库碳循环研究.发表论文10余篇.ljia@ctgu.edu.cn.

引用本文:

刘佳, 胡杰茗, 郑祥旺, 康满春, 孟江槐, 肖尚斌. 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[J]. 中国环境科学, 2023, 43(5): 2508-2518. LIU Jia, HU Jie-ming, ZHENG Xiang-wang, KANG Man-chun, MENG Jiang-huai, XIAO Shang-bin. Effects of Three Gorges Reservoir operation on tempo-spatial distribution of dissolved methane in Xiangxi Reservoir Bay. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2508-2518.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I5/2508

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