DOI: 10.5194/hess-20-347-2016
Scopus记录号: 2-s2.0-84956982843
论文题名: High-frequency monitoring of water fluxes and nutrient loads to assess the effects of controlled drainage on water storage and nutrient transport
作者: Rozemeijer J ; C ; , Visser A ; , Borren W ; , Winegram M ; , Van Der Velde Y ; , Klein J ; , Broers H ; P
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 1 起始页码: 347
结束页码: 358
语种: 英语
Scopus关键词: Agriculture
; Aquatic ecosystems
; Catchments
; Eutrophication
; Groundwater
; Salinity measurement
; Soil moisture
; Surface waters
; Water conservation
; Water levels
; Concentration Measurement
; Controlled drainage
; Elevated concentrations
; High-frequency monitoring
; Moisture conditions
; Precipitation rates
; Shallow groundwater
; Time-averaged concentrations
; Nutrients
; catchment
; concentration (composition)
; drainage
; groundwater
; nitrogen
; nutrient uptake
; optimization
; phosphorus
; soil moisture
; water exchange
; water storage
; Netherlands
英文摘要: High nitrogen (N) and phosphorus (P) fluxes from upstream agriculture threaten aquatic ecosystems in surface waters and estuaries, especially in areas characterized by high agricultural N and P inputs and densely drained catchments like the Netherlands. Controlled drainage has been recognized as an effective option to optimize soil moisture conditions for agriculture and to reduce unnecessary losses of fresh water and nutrients. This is achieved by introducing control structures with adjustable overflow levels into subsurface tube drain systems. A small-scale (1 ha) field experiment was designed to investigate the hydrological and chemical changes after introducing controlled drainage. Precipitation rates and the response of water tables and drain fluxes were measured in the periods before the introduction of controlled drainage (2007-2008) and after (2009-2011). For the N and P concentration measurements, auto-analyzers for continuous records were combined with passive samplers for time-averaged concentrations at individual drain outlets. The experimental setup enabled the quantification of changes in the water and solute balance after introducing controlled drainage. The results showed that introducing controlled drainage reduced the drain discharge and increased the groundwater storage in the field. To achieve this, the overflow levels have to be elevated in early spring, before the drain discharge stops due to dryer conditions and falling groundwater levels. The groundwater storage in the field would have been larger if the water levels in the adjacent ditch were controlled as well by an adjustable weir. The N concentrations and loads increased, which was largely related to elevated concentrations in one of the three monitored tube drains. The P loads via the tube drains reduced due to the reduction in discharge after introducing controlled drainage. However, this may be counteracted by the higher groundwater levels and the larger contribution of N-and P-rich shallow groundwater and overland flow to the surface water. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78937
Appears in Collections: 气候变化事实与影响
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作者单位: Deltares, P.O. Box 85467, AL Utrecht, Netherlands; Lawrence Livermore National Lab, P.O. Box 808, Livermore, CA, United States; Allseas Engineering, Poortweg 12, PA Delft, Netherlands; Department of Earth Sciences, VU University Amsterdam, Boelelaan 1085, HV Amsterdam, Netherlands; TNO Geological Survey of the Netherlands, P.O. Box 80015, TA Utrecht, Netherlands
Recommended Citation:
Rozemeijer J,C,, Visser A,et al. High-frequency monitoring of water fluxes and nutrient loads to assess the effects of controlled drainage on water storage and nutrient transport[J]. Hydrology and Earth System Sciences,2016-01-01,20(1)