Identifying geochemical hot moments and their controls on a contaminated river floodplain system using wavelet and entropy approaches

被引：35

作者：

Arora, Bhavna ^{[1
]}

Dwivedi, Dipankar ^{[1
]}

Hubbard, Susan S. ^{[1
]}

Steefel, Carl I. ^{[1
]}

Williams, Kenneth H. ^{[1
]}

机构：

[1] Lawrence Berkeley Natl Lab, Berkeley, CA USA

来源：

ENVIRONMENTAL MODELLING & SOFTWARE | 2016年 / 85卷

关键词：

Wavelet analysis; Temporal variability; Biogeochemical processes; Field data; MUTUAL-INFORMATION; SULFATE REDUCTION; URANIUM; SPOTS; BIOREMEDIATION; HETEROGENEITY; REGISTRATION; GROUNDWATER; AQUIFER;

D O I：

10.1016/j.envsoft.2016.08.005

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Geochemical hot moments are defined here as short periods of time that are associated with disproportionally high levels of concentrations (biogeochemically-driven or transport-related) relative to longer intervening time periods. We used entropy and wavelet techniques to identify temporal variability in geochemical constituents and their controls along three transects within a contaminated floodplain system near Rifle CO. Results indicated that transport-dominated hot moments drove overall geochemical processing in the contaminated groundwater and seep zones. These hot moments were associated with seasonal hydrologic variability (similar to 4 months) in the contaminated aquifer and with annual hydrologic cycle and residence times in the seep zone. Hot moments associated with a naturally reduced zone within the aquifer were found to be biogeochemically-driven, with a different dominant frequency (similar to 3 months) and no correlation to hydrologic or weather variations, in contrast to what is observed in other regions of the floodplain. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：27 / 41

页数：15

共 73 条

[1] Stimulating the in situ activity of Geobacter species to remove uranium from the groundwater of a uranium-contaminated aquifer [J].