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

Gunnar Nützmann; Stanislaw Maciejewski; Wioletta Gorczewska-Langner

doi:10.7306/gq.1669

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

Abstract

The 216 km2 Neuenhagen Millcreeck catchment can be characterized as a drought sensitive landscape in NE Germany. It is therefore a 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 also, especially in landscapes with light sandy soils. For a better understanding of these processes a dual tracer field experiment with bromide (Br-) and deuterium (D2O) was carried out years ago. The aim of the present study is to use results of these data for modelling tracer transport in the unsaturated zone with 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 or 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 simulation of water and solute transport in unsaturated sandy soils which are heavily affected by droughts and irregular hydrological processes in the subsurface.

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Authors (3)

Gunnar Nützmann
- Humboldt-University of Berlin, Germany and Geographical Department
Stanislaw Maciejewski
- Institute of Hydroengineering of Polish Academy of Sciences
Wioletta Gorczewska-Langner dr inż.

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Category:

Articles

Type:

artykuły w czasopismach

Published in:

GEOLOGICAL QUARTERLY no. 66,
ISSN: 1641-7291

Language:

English

Publication year:

2022

Bibliographic description:

Nützmann G., Maciejewski S., Gorczewska-Langner W.: Deterministic versus stochastic modelling of unsaturated flow in a sandy field soil based on dual tracer breakthrough data// GEOLOGICAL QUARTERLY -, (2022),

DOI: