Modeling hydro-biogeochemical transformation of chromium in hyporheic zone: Effects of spatial and temporal resolutions

Yang，Chen1,2; Zheng，Fei3; Liu，Yuanyuan4; Zhang，You Kuan1,2; Liu，Wei5; Zhang，Qiang1,2; Yang，Xiaofan6

2019-12-01

10.1016/j.jhydrol.2019.124152

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

Effects of spatial and temporal resolutions (SR and TR) on modeling hydro-biogeochemical transformation of chromium (Cr) are important in simulating reactive transport processes. The current study was conducted in the hyporheic zone (HZ) at the Hanford Site of the U.S. Department of Energy, which has been known for its highly heterogeneous sediments and transient hydrodynamics. Distributions of hydraulic conductivity and sediment-associated Fe concentration were averaged at a group of SRs, while measured hourly water levels were further moving averaged at daily and monthly TRs. Fe concentration is selected for assembling geochemical heterogeneity due to its important role in redox transformation of Cr at the site. Three Fe distributions, with Fe concentrated on small, medium, and large sediment grains, respectively, were also considered. A series of flow and reactive transport simulations configured with different combinations of SRs, TRs, and Fe distributions were conducted. Simulated results revealed that Cr(VI) discharged to river is underestimated if SR decreases. For both the hydrodynamics and the discharge of Cr(VI) to river, difference caused by SR can be amplified with the decrease of TR. Biogeochemical transformation of Cr is more dependent on SR while hydrodynamics is on TR. The stronger control of SR than TR on biogeochemical transformation of Cr is resulted from more sensitive increase of Fe(II) with decreasing SR than with decreasing TR. Effect of SR is highly sensitive to variations of SR with Fe on medium-size grains while is persistent to a much smaller SR with Fe on small-size grains. Results from the current study are expected to benefit modelers on the selections of the spatial-temporal resolutions for in-house modeling and field sampling, which may also have implications for upscaling.

Chromium Discretization scale Hydro-biogeochemical processes Hyporheic zone Reactive transport modeling

SCI ; EI

英语

第一

Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, China[2017B030301012]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000500371200024

ELSEVIER

20193907473180

Biogeochemistry ; Chromium ; Hydrodynamics ; Iron compounds ; Sediments ; Stream flow ; Water levels

Waterways:407.2 ; Geochemistry:481.2 ; Soil Mechanics and Foundations:483 ; Chromium and Alloys:543.1

ENGINEERING

2-s2.0-85072576243

Scopus

1.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution ControlSchool of Environmental Science and EngineeringSouthern University of Science and Technology,Shenzhen,518055,China
2.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution ControlSchool of Environmental Science and EngineeringSouthern University of Science and Technology,Shenzhen,518055,China
3.MCC Water Environment Technology Research InstituteMCC Huatian Engineering & Technology Corporation,Nanjing,210019,China
4.School of Earth Sciences and EngineeringNanjing University,Nanjing,210023,China
5.Institute of Geological SurveyChina University of Geosciences,Wuhan,430074,China
6.State Key Laboratory of Earth Surface Processes and Resource EcologyFaculty of Geographical ScienceBeijing Normal University,Beijing,100875,China

Yang，Chen,Zheng，Fei,Liu，Yuanyuan,et al. Modeling hydro-biogeochemical transformation of chromium in hyporheic zone: Effects of spatial and temporal resolutions[J]. JOURNAL OF HYDROLOGY,2019,579.

Yang，Chen.,Zheng，Fei.,Liu，Yuanyuan.,Zhang，You Kuan.,Liu，Wei.,...&Yang，Xiaofan.(2019).Modeling hydro-biogeochemical transformation of chromium in hyporheic zone: Effects of spatial and temporal resolutions.JOURNAL OF HYDROLOGY,579.

Yang，Chen,et al."Modeling hydro-biogeochemical transformation of chromium in hyporheic zone: Effects of spatial and temporal resolutions".JOURNAL OF HYDROLOGY 579(2019).