Effects of Three Gorges Reservoir operation on tempo-spatial distribution of dissolved methane in Xiangxi Reservoir Bay

被引：0

作者：

Liu, Jia ^{[1
,2
,3
,4
]}

Hu, Jie-Ming ^{[2
,3
,4
]}

Zheng, Xiang-Wang ^{[5
]}

Kang, Man-Chun ^{[2
,3
,4
]}

Meng, Jiang-Huai ^{[2
,3
,4
]}

Xiao, Shang-Bin ^{[2
,3
,4
]}

机构：

[1] Post Doctoral Research Station of Hydraulic Engineering of Three Gorges University, Yichang,443002, China

[2] Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Yichang,443002, China

[3] Hubei Field Observation and Scientific Research Stations for Water Ecosystem in Three Gorges Reservoir, Yichang,443002, China

[4] College of Hydraulic and Environment Engineering, China Three Gorges University, Yichang,443002, China

[5] Huaneng Lancang River Hydropower Inc., Kunming,650214, China

来源：

Zhongguo Huanjing Kexue/China Environmental Science | 2023年 / 43卷 / 05期

关键词：

Barium compounds - Dissolution - Rivers - Water;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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/L in 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. © 2023 Chinese Society for Environmental Sciences. All rights reserved.

引用

页码：2508 / 2518