Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope

LI Dashuai; WU Shaojing; LI Jianhong; ZHANG Tao

doi:10.11932/karst2022y02

Volume 41 Issue 2

Jul. 2022

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LI Dashuai, WU Shaojing, LI Jianhong, ZHANG Tao. Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope[J]. CARSOLOGICA SINICA, 2022, 41(2): 183-196. doi: 10.11932/karst2022y02

Citation:

LI Dashuai, WU Shaojing, LI Jianhong, ZHANG Tao. Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope[J]. CARSOLOGICA SINICA, 2022, 41(2): 183-196. doi: 10.11932/karst2022y02

Citation:

LI Dashuai, WU Shaojing, LI Jianhong, ZHANG Tao. Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope[J]. CARSOLOGICA SINICA, 2022, 41(2): 183-196. doi: 10.11932/karst2022y02

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Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope

doi: 10.11932/karst2022y02

LI Dashuai^{1, 2
,},
WU Shaojing³,
LI Jianhong^{2
,
,},
ZHANG Tao²

1.
School of Geographical Sciences, Southwest University, Chongqing 400715, China
2.
Institute of Karst Geology, CAGS/ Key Laboratory of Karst Dynamics, MNR & GZAR, Guilin, Guangxi 541004, China
3.
Management Institute of Dalongdong Water Conservancy Project, Shanglin County, Nanning, Guangxi 530500, China

Received Date: 2020-12-01

Abstract

Abstract

Dalongdong Reservoir, a typical groundwater recharge reservoir in karst area of southwest China, is located at 23°30′01″−23°40′08″N and 108°30′02″−108°36′04″E in Shanglin county, Nanning City, Guangxi. This large reservoir was built mainly for irrigation and power generation by blocking caves, sinkholes and some fissures in a karst valley in 1958. It covers a rainwater collecting area of 310 km², totaling storage capacity of 151 million m³. Approximately 95% of the recharge water comes from two karst subterranean streams. The principal strata in the reservoir catchment are carbonate rocks of Carboniferous (C1) and Devonian (D₂d³) era. Influenced by the subtropical monsoon climate, the average temperature in the reservoir area is 21℃ and the average rainfall is 1,837.3 mm. The rainy season in this area is from April to September. Samples were collected respectively by the plankton method at the upper, middle and downstream monitoring sites in January, April, July, October and December, 2018. Based on DIC concentration, δ¹³C_DIC value, water temperature, DO, SIC, partial pressure of carbon dioxide, carbon dioxide diffusion flux and other indicators, the thermal structure change on DIC concentrations and isotope composition δ¹³C_DIC in each water layer of reservoir and its influencing factors are systematically studied. The gradient differences of DIC concentrations and isotopic composition δ¹³C_DIC in different water layers and their causes are also discussed.In order to provide scientific and technological support for accurate assessment of carbon budget of land and water, the carbon cycle process of karst reservoirs was deeply revealed. The results show that Dalongdong reservoir presents periodic thermal structure changes in the mixing stage−stratification stage−in a hydrological year. The thermal stratification begins to appear in April, gradually presents complete thermal stratification in July, and gradually disappears after October.Besides, thermal stratification is an important driving force of DIC concentration and δ¹³C_DIC value. After the formation of thermal stratification, DIC concentrations in the upper, middle and lower reaches show the same characteristics as those of the δ¹³C_DIC values at the same layer, and DIC concentrations increase with depth, while δ¹³C_DIC values become negative. DIC concentrations and δ¹³C_DIC values are respectively 3.22 mmol·L⁻¹ and −9.15‰ in surface water, 3.43 mmol·L⁻¹ and −9.70‰ in thermocline, and 4.32 mmol·L⁻¹ and −11.89‰ in bottom water. After thermal stratification, the vertical, horizontal and seasonal variations of DIC concentrations and δ¹³C_DIC values gradually disappear, and finally show their homogenization.Finally, carbon dioxide degassing and photosynthesis dominate the water-air interface in the surface water layer. Degradation of organic matter is the main process in thermocline, and carbonate precipitation can be mostly found in the bottom water layer. The change of these three processes with the reservoir thermal structure may drive the variation of DIC concentrations and isotope gradient G (DIC) and G (δ¹³C_DIC), which shows the characteristics of bottom water layer < surface water layer < thermocline layer.
- dissolved inorganic carbon,
- stable carbon isotope,
- thermal stratification,
- carbon dioxide degassing

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References(45)

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Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope

doi: 10.11932/karst2022y02

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Influence process of thermal structure variations of a karst water reservoir on dissolved inorganic carbon and its stable carbon isotope

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