DOI: 10.5194/hess-19-4859-2015
Scopus记录号: 2-s2.0-84977666956
论文题名: Spatially distributed influence of agro-environmental factors governing nitrate fate and transport in an irrigated stream-aquifer system
作者: Bailey R ; T ; , Ahmadi M ; , Gates T ; K ; , Arabi M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 12 起始页码: 4859
结束页码: 4876
语种: 英语
Scopus关键词: Aquifers
; Crops
; Denitrification
; Groundwater
; Groundwater pollution
; Groundwater resources
; Hydraulic structures
; Leaching
; Nitrates
; Remediation
; Sensitivity analysis
; Soils
; Anthropogenic activity
; Autotrophic denitrification
; Environmental parameter
; Groundwater concentrations
; Heterotrophic denitrification
; Lower arkansas river valleys
; Reactive transport modeling
; Remediation strategies
; River pollution
; aquifer
; concentration (composition)
; denitrification
; environmental factor
; environmental fate
; finite difference method
; groundwater
; human activity
; irrigation system
; nitrate
; nitrogen cycle
; oxygen
; pollutant transport
; sensitivity analysis
; spatial distribution
; stream
; Arkansas Valley
; Colorado
; United States
英文摘要: Elevated levels of nitrate (NO3) in groundwater systems pose a serious risk to human populations and natural ecosystems. As part of an effort to remediate NO3 contamination in irrigated stream-aquifer systems, this study elucidates agricultural and environmental parameters and processes that govern NO3 fate and transport at the regional (500 km2), local (50 km2), and field scales (<1 km2). Specifically, the revised Morris sensitivity analysis method was applied to a finite-difference nitrogen cycling and reactive transport model of a regional-scale study site in the lower Arkansas River valley in southeastern Colorado. The method was used to rank the influence of anthropogenic activities and natural chemical processes on NO3 groundwater concentration, NO3 mass leaching, and NO3 mass loading to the Arkansas River from the aquifer. Sensitivity indices were computed for the entire study area in aggregate as well as each canal command area, crop type, and individual grid cells. Results suggest that fertilizer loading, crop uptake, and heterotrophic denitrification govern NO3 fate and transport for the majority of the study area, although their order of influence on NO3 groundwater concentration and mass leaching varies according to crop type and command area. Canal NO3 concentration and rates of autotrophic denitrification, nitrification, and humus decomposition also dominate or partially dominate in other locations. Each factor, with the exception of O2 reduction rate, is the dominating influence on NO3 groundwater concentration at one or more locations within the study area. Results can be used to determine critical processes and key management actions for future data collection and remediation strategies, with efforts able to be focused on localized areas. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78368
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Civil and Environmental Engineering, Colorado State University, 1372 Campus Delivery, Fort Collins, CO, United States; Department of Civil Engineering, Sharif University of Technology, Azadi St., Tehran, Iran
Recommended Citation:
Bailey R,T,, Ahmadi M,et al. Spatially distributed influence of agro-environmental factors governing nitrate fate and transport in an irrigated stream-aquifer system[J]. Hydrology and Earth System Sciences,2015-01-01,19(12)