Modelling nitrate transport and turnover in a lowland catchment system

Wriedt, Gunter; Rode, Michael

doi:10.1016/j.jhydrol.2005.12.017

Cited by 93 publications

(57 citation statements)

References 39 publications

(52 reference statements)

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“…Donner et al, 2002;Huang et al, 2014;Johnes, 1996;Smethurst et al, 2014;Wagenschein and Rode, 2008;Wriedt and Rode, 2006). Nevertheless, there is still a lack of knowledge on how the spatial patterns of in-stream nitrate concentrations evolve throughout stream networks and whether these patterns are constant over time or vary in time.…”

Section: T Schuetz Et Al: Nitrate Sinks and Sources As Controls Of mentioning

confidence: 99%

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Schuetz¹,

Gascuel‐Odoux²,

Durand³

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. Several controls are known to affect water quality of stream networks during flow recession periods, such as solute leaching processes, surface water-groundwater interactions as well as biogeochemical in-stream turnover processes. Throughout the stream network, combinations of specific water and solute export rates and local in-stream conditions overlay the biogeochemical signals from upstream sections. Therefore, upstream sections can be considered functional units which could be distinguished and ordered regarding their relative contribution to nutrient dynamics at the catchment outlet. Based on snapshot sampling of flow and nitrate concentrations along the stream in an agricultural headwater during the summer flow recession period, we determined spatial and temporal patterns of water quality for the whole stream. A data-driven, in-stream-mixingand-removal model was developed and applied for analysing the spatio-temporal in-stream retention processes and their effect on the spatio-temporal fluxes of nitrate from subcatchments. Thereby, we have been able to distinguish quantitatively between nitrate sinks, sources per stream reaches, and subcatchments, and thus we could disentangle the overlay of nitrate sink and source signals. For nitrate sources, we determined their permanent and temporal impact on stream water quality and for nitrate sinks, we found increasing nitrate removal efficiencies from upstream to downstream. Our results highlight the importance of distinct nitrate source locations within the watershed for in-stream concentrations and in-stream removal processes, respectively. Thus, our findings contribute to the development of a more dynamic perception of water quality in streams and rivers concerning ecological and sustainable water resource management.

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Section: T Schuetz Et Al: Nitrate Sinks and Sources As Controls Of mentioning

confidence: 99%

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Schuetz¹,

Gascuel‐Odoux²,

Durand³

et al. 2016

Hydrol. Earth Syst. Sci.

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show abstract

“…− concentrations are often found spatially and temporally variable in aquifers (Böhlke et al 2002;Wriedt and Rode 2006;Thayalakumaran et al 2008); this is usually related to variations in groundwater flow and NO 3 − attenuation rate (Tesoriero et al 2000;Almasri and Kaluarachchi 2007). In Italy, the Po River valley is the largest and more intensively farmed alluvial plain, and it is heavily impacted by NO 3 − groundwater contamination (Mastrocicco et al 2010a, b;Onorati et al 2006;Cinnirella et al 2005) and surface water eutrophication (Provini et al 1992;Palmieri et al 2005).…”

Section: Nomentioning

confidence: 99%

Reactive Modeling of Denitrification in Soils with Natural and Depleted Organic Matter

Mastrocicco

Colombani

Salemi

et al. 2011

Water Air Soil Pollut

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Nitrogen fertilizers used in agriculture often cause nitrate leaching towards shallow groundwater, especially in lowland areas where the flat topography minimize the surface run off. In order to introduce good agricultural practices that reduce the amount of nitrate entering the groundwater system, it is important to quantify the kinetic control on nitrate attenuation capacity. With this aim, a series of anaerobic batch experiments, consisting of loamy soils and nitrate-contaminated groundwater, were carried out using acetate and natural dissolved organic matter as electron donors. Acetate was chosen because it is the main intermediate species in many biodegradation pathways of organic compounds, and it is a suitable carbon source for denitrification. Sorption of acetate was also determined, fitting a Langmuir isotherm in both natural and artificially depleted organic matter soils. Experiments were performed in quadruplicate to account for the spatial variability of soil parameters. The geochemical code PHREEQC (version 2) was used to simulate kinetic denitrification using Monod equation, equilibrium Langmuir sorption of acetate, and equilibrium reactions of gas and mineral phases (calcite). The reactive modeling results highlighted a rapid acetate and nitrate mineralization rate, suggesting that the main pathway of nitrate attenuation is through denitrification while calcite acted as a buffer for pH. However, in the absence of acetate, the natural content of organic matter did not allow to complete the denitrification process leading to nitrite accumulation. Reactive modeling is thought to be an efficient and robust tool to quantify the complex biogeochemical reactions which can take place in underground environments.

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“…In a sandy aquifer in Denmark, the dominance of pyrite oxidation was attributed to the low in situ reactivity of the organic matter (Postma et al, 1991). Several modeling studies focusing on denitrification in groundwater also include pyrite oxidation (Frind et al, 1990;Boettcher et al, 1991;Wriedt and Rode, 2006;Spiteri et al, 2008). They further illustrate the potential role of kinetic factors related to the reactivities of pyrite and organic matter in determining which denitrification process is most important in a given aquifer.…”

Section: Introductionmentioning

confidence: 99%

Denitrification coupled to pyrite oxidation and changes in groundwater quality in a shallow sandy aquifer

Zhang

Slomp

Broers

et al. 2009

Geochimica et Cosmochimica Acta

115

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Modelling nitrate transport and turnover in a lowland catchment system

Cited by 93 publications

References 39 publications

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Reactive Modeling of Denitrification in Soils with Natural and Depleted Organic Matter

Denitrification coupled to pyrite oxidation and changes in groundwater quality in a shallow sandy aquifer

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