Model-Based Analysis of the Effects of Dam-Induced River Water and Groundwater Interactions on Hydro-Biogeochemical Transformation of Redox Sensitive Contaminants in a Hyporheic Zone

Yang, Chen1,2; Zhang, You-Kuan2; Liu, Yuanyuan3; Yang, Xiaofan4; Liu, Chongxuan2

2018-09

10.1029/2018WR023286

WATER RESOURCES RESEARCH   影响因子和分区

0043-1397

1944-7973

Biogeochemical processes in the hyporheic zone (HZ) may retard the contaminants migration from groundwater to the river and vice versa. Anthropogenic activities may further complicate such processes. This study investigated the effects of dam-induced hydrodynamics on biogeochemical transformation of contaminants using Cr as an example in the HZ of the Columbia River at the U.S. Department of Energy's Hanford Site. The flow velocities in the HZ were first simulated using the measured or averaged groundwater level and river stage at hourly, daily, weekly, and monthly time scales. The flow velocities were then incorporated into a reactive transport model with independently characterized biogeochemical reactions and kinetics. Simulation results indicated that hydrodynamics can significantly influence the rate and extent of Cr (VI) biogeochemical transformation, which was mainly controlled by the kinetic reduction of Cr (VI) to sparely soluble Cr (III) by sediment-associated Fe (II) that can be regenerated by microorganisms with organic carbon as electron donor. The frequent flow direction reversals in the HZ induced by dam operations enhanced the rate of microbial consumption of bioavailable OC, which, if there was no organic carbon supply, can eventually terminate the Fe (II) regeneration mechanism and exhaust the HZ's redox capacity in reducing Cr (VI) to Cr (III). This study demonstrated the importance of hydrodynamics on biogeochemical transformation of contaminants in the HZ and of the time scales used in assessing the reactive transport of chemicals and contaminants in the HZ as the net supply of redox sensitive chemicals such as dissolved oxygen into the HZ is a function of the frequency of flow direction reversal.

anthropogenic activities river water and groundwater interactions reactive transport coupled hydrology and biogeochemistry retardation capacity hyporheic zone

SCI ; EI

英语

通讯

Southern University of Science and Technology[G01296001]

Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources

Environmental Sciences ; Limnology ; Water Resources

WOS:000448088100008

AMER GEOPHYSICAL UNION

20183705800236

Biogeochemistry ; Contamination ; Dissolved oxygen ; Flow velocity ; Groundwater ; Groundwater pollution ; Hydrodynamics ; Iron compounds ; Organic carbon ; Oxygen supply ; River pollution ; Rivers ; Stream flow

Groundwater:444.2 ; Water Pollution:453 ; Geochemistry:481.2 ; Fluid Flow:631 ; Fluid Flow, General:631.1 ; Chemical Products Generally:804 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

Web of Science

1.China Univ Geosci, Sch Environm Studies, Wuhan, Hubei, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Prov Key Lab Soil & Groundwater Pollut Control, Shenzhen, Peoples R China
3.Nanjing Univ, Sch Earth Sci & Engn, Nanjing, Jiangsu, Peoples R China
4.Beijing Normal Univ, Fac Geog Sci, Beijing, Peoples R China

Yang, Chen,Zhang, You-Kuan,Liu, Yuanyuan,et al. Model-Based Analysis of the Effects of Dam-Induced River Water and Groundwater Interactions on Hydro-Biogeochemical Transformation of Redox Sensitive Contaminants in a Hyporheic Zone[J]. WATER RESOURCES RESEARCH,2018,54(9):5973-5985.

Yang, Chen,Zhang, You-Kuan,Liu, Yuanyuan,Yang, Xiaofan,&Liu, Chongxuan.(2018).Model-Based Analysis of the Effects of Dam-Induced River Water and Groundwater Interactions on Hydro-Biogeochemical Transformation of Redox Sensitive Contaminants in a Hyporheic Zone.WATER RESOURCES RESEARCH,54(9),5973-5985.

Yang, Chen,et al."Model-Based Analysis of the Effects of Dam-Induced River Water and Groundwater Interactions on Hydro-Biogeochemical Transformation of Redox Sensitive Contaminants in a Hyporheic Zone".WATER RESOURCES RESEARCH 54.9(2018):5973-5985.