DOI: 10.5194/hess-20-2119-2016
Scopus记录号: 2-s2.0-84973664235
论文题名: Quantifying the influence of surface water-groundwater interaction on nutrient flux in a lowland karst catchment
作者: McCormack T ; , Naughton O ; , Johnston P ; M ; , Gill L ; W
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 5 起始页码: 2119
结束页码: 2133
语种: 英语
Scopus关键词: Catchments
; Climate models
; Floods
; Groundwater
; Groundwater flow
; Hydrology
; Lakes
; Landforms
; pH
; Runoff
; Sedimentation
; Surface waters
; Water pollution
; Conservative conditions
; Groundwater flow systems
; Hydrological modeling
; Karst groundwater
; Nitrogen concentrations
; Nutrient concentrations
; Nutrient contamination
; Surface water-groundwater interaction
; Nutrients
; agricultural runoff
; catchment
; concentration (composition)
; ephemeral lake
; food production
; global perspective
; groundwater-surface water interaction
; hydrological modeling
; karst hydrology
; nutrient loss
; quantitative analysis
英文摘要: Nutrient contamination of surface waters and groundwaters is an issue of growing importance as the risks associated with agricultural run-off escalate due to increasing demands on global food production. In this study, the influence of surface water-groundwater interaction on the nutrient flux in a lowland karst catchment was investigated with the aid of alkalinity sampling and a hydrological model. The objective of the study was to determine the impact of ephemeral karst lakes (turloughs) on the surface water-groundwater nutrient flux, and whether these lakes act as sources or sinks of nutrients within the groundwater flow system. Water samples were tested from a variety of rivers, turloughs, boreholes and springs at monthly intervals over 3 years. Alkalinity sampling was used to elucidate the contrasting hydrological functioning between different turloughs. Such disparate hydrological functioning was further investigated with the aid of a hydrological model which allowed for an estimate of allogenically and autogenically derived nutrient loading into the karst system. The model also allowed for an investigation of mixing within the turloughs, comparing observed behaviours with the hypothetical conservative behaviour allowed for by the model. Within the turloughs, recorded nutrient concentrations were found to reduce over the flooded period, even though the turloughs hydrological functioning (and the hydrological model) suggested this would not occur under conservative conditions. As such, it was determined that nutrient loss processes were occurring within the system. Denitrification during stable flooded periods (typically 3-4 months per year) was deemed to be the main process reducing nitrogen concentrations within the turloughs, whereas phosphorus loss is thought to occur mostly via sedimentation and subsequent soil deposition. The results from this study suggest that, in stable conditions, ephemeral lakes can impart considerable nutrient losses on a karst groundwater system. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78832
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, Dublin, Ireland; Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland
Recommended Citation:
McCormack T,, Naughton O,, Johnston P,et al. Quantifying the influence of surface water-groundwater interaction on nutrient flux in a lowland karst catchment[J]. Hydrology and Earth System Sciences,2016-01-01,20(5)