Deterministic versus stochastic modelling of unsaturated flow in a sandy field soil based on dual tracer breakthrough data

• Autorzy: Nützmann Gunnar , Maciejewski Stanisław , Gorczewska-Langner Wioletta

Identyfikatory

DOI

10.7306/gq.1669

• Języki publikacji: EN

Abstrakty

EN

The 216 km² Neuenhagen Millcreeck catchment can be characterized as a drought-sensitive landscape in NE Germany. It is therefore of fundamental human interest to understand how water that fell as precipitation moves through the unsaturated soils and recharges groundwater. Additionally, a better knowledge of nutrient transport from soil to groundwater is important, especially in landscapes with light sandy soils. For a better understanding of these processes a dual tracer field experiment with bromide (Br^-) and deuterium (D₂ O) was carried out some years ago. The aim of the present study is to use the results of this experiment to model tracer transport in the unsaturated zone via two different concepts, the classical deterministic advection-dispersion equation and a new stochastic approach. The advantage of the stochastic modelling method proposed here for field-scale tracer application is to produce reliable information about expected total solute fluxes from the unsaturated zone to groundwater and about mean transit times. Moreover, this allows one to evaluate the mass of solute in the soil profile and to determine the range of water velocity fluctuations. Field experiments should be concentrated on estimation of fluctuation of water flow velocity to make stochastic models more accurate. To summarize, this work contributes to new modelling methods for the simulation of water and solute transport in unsaturated sandy soils which are heavily affected by droughts and irregular hydrological processes in the subsurface.

Słowa kluczowe

EN

unsaturated flow; tracer transport; breakthrough curve; deterministic modelling; stochastic modelling

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2022
• Tom: Vol. 66, No. 4
• Strony: art. no. 37
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Nützmann Gunnar

• Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, D-12587 Berlin, Germany
• Humboldt-University of Berlin, Germany and Geographical Department, Unter den Linden 6, D-10099 Berlin, Germany

autor

Maciejewski Stanisław

• Institute of Hydroengineering of Polish Academy of Sciences, Koœcierska 7, 80-828 Gdańsk, Poland

autor

Gorczewska-Langner Wioletta

• Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, Narutowicza 11/12, 80-233 Gdańsk, Poland

• https://orcid.org/0000-0001-9907-552

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).