DOI: 10.5194/hess-20-1851-2016
Scopus记录号: 2-s2.0-84969760992
论文题名: High-frequency monitoring reveals nutrient sources and transport processes in an agriculture-dominated lowland water system
作者: Van Der Grift B ; , Broers H ; P ; , Berendrecht W ; , Rozemeijer J ; , Osté L ; , Griffioen J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 5 起始页码: 1851
结束页码: 1868
语种: 英语
Scopus关键词: Agricultural runoff
; Agriculture
; Catchments
; Clay
; Flow of water
; Groundwater flow
; Lakes
; Nutrients
; Pumping plants
; Pumps
; Rain
; Sea level
; Soils
; Water quality
; Waterworks
; Agricultural land
; Freeze-thaw cycles
; High-frequency monitoring
; Intensive rainfall
; Polder water systems
; Preferential flows
; Temporal dynamics
; Water quality monitoring
; Eutrophication
; agricultural runoff
; eutrophication
; lowland environment
; nitrous oxide
; phosphorus
; preferential flow
; pumping
; rainfall-runoff modeling
; resuspension
; retention
; turbidity
; water flow
; water quality
; Netherlands
英文摘要: Many agriculture-dominated lowland water systems worldwide suffer from eutrophication caused by high nutrient loads. Insight in the hydrochemical functioning of embanked polder catchments is highly relevant for improving the water quality in such areas or for reducing export loads to downstream water bodies. This paper introduces new insights in nutrient sources and transport processes in a polder in the Netherlands situated below sea level using high-frequency monitoring technology at the outlet, where the water is pumped into a higher situated lake, combined with a low-frequency water quality monitoring programme at six locations within the drainage area. Seasonal trends and short-scale temporal dynamics in concentrations indicated that the NO3concentration at the pumping station originated from N loss from agricultural lands. The NO3loads appear as losses via tube drains after intensive rainfall events during the winter months due to preferential flow through the cracked clay soil. Transfer function-noise modelling of hourly NO3concentrations reveals that a large part of the dynamics in NO3concentrations during the winter months can be related to rainfall. The total phosphorus (TP) concentration and turbidity almost doubled during operation of the pumping station, which points to resuspension of particulate P from channel bed sediments induced by changes in water flow due to pumping. Rainfall events that caused peaks in NO3concentrations did not results in TP concentration peaks. The rainfall induced and NO3enriched quick interflow, may also be enriched in TP but retention of TP due to sedimentation of particulate P then results in the absence of rainfall induced TP concentration peaks. Increased TP concentrations associated with run-off events is only observed during a rainfall event at the end of a freeze-thaw cycle. All these observations suggest that the P retention potential of polder water systems is primarily due to the artificial pumping regime that buffers high flows. As the TP concentration is affected by operation of the pumping station, timing of sampling relative to the operating hours of the pumping station should be accounted for when calculating P export loads, determining trends in water quality, or when judging water quality status of polder water systems. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78848
Appears in Collections: 气候变化事实与影响
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作者单位: Copernicus Institute of Sustainable Development, Faculty of Geosciences, Utrecht University, P.O. Box 80115, TA Utrecht, Netherlands; Deltares, P.O. Box 85467, AL Utrecht, Netherlands; TNO Geological Survey of the Netherlands, P.O. Box 80015, TA Utrecht, Netherlands; Berendrecht Consultancy, Stakenbergerhout 107, JE Harderwijk, Netherlands
Recommended Citation:
Van Der Grift B,, Broers H,P,et al. High-frequency monitoring reveals nutrient sources and transport processes in an agriculture-dominated lowland water system[J]. Hydrology and Earth System Sciences,2016-01-01,20(5)