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Adam Szymkiewicz
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland

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Journal article
Published: 07 April 2020 in Water
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This study focuses on the modeling of groundwater flow and nitrate transport in a multi-aquifer hydrosystem in northern Poland, adjacent to Puck Bay (Baltic sea). The main goal was to investigate how changes in land use and farming practices may affect groundwater recharge and submarine groundwater discharge (SGD) to the sea and the associated N-NO3 fluxes. An integrated modelling approach has been developed, which couples the SWAT hydrologic model, MODFLOW-NWT groundwater flow model, and MT3DMS transport model. Transient simulations were performed for a 10 y period, assuming 10 different scenarios of land use (farming, grassland, forest) and crop types. Both recharge and SGD showed a distinct pattern of seasonal time variability. In terms of the average flow rates, the effect of varying crop type was more significant than that of land use change, with the minimum recharge and SGD corresponding to winter wheat and the maximum for peas and potatoes. Nitrate loads were strongly affected by both land use and crop type, with minimum values obtained for grassland and maximum values for canola.

ACS Style

Adam Szymkiewicz; Dawid Potrykus; Beata Jaworska-Szulc; Anna Gumuła-Kawęcka; Małgorzata Pruszkowska-Caceres; Lidia Dzierzbicka-Głowacka. Evaluation of the Influence of Farming Practices and Land Use on Groundwater Resources in a Coastal Multi-Aquifer System in Puck Region (Northern Poland). Water 2020, 12, 1042 .

AMA Style

Adam Szymkiewicz, Dawid Potrykus, Beata Jaworska-Szulc, Anna Gumuła-Kawęcka, Małgorzata Pruszkowska-Caceres, Lidia Dzierzbicka-Głowacka. Evaluation of the Influence of Farming Practices and Land Use on Groundwater Resources in a Coastal Multi-Aquifer System in Puck Region (Northern Poland). Water. 2020; 12 (4):1042.

Chicago/Turabian Style

Adam Szymkiewicz; Dawid Potrykus; Beata Jaworska-Szulc; Anna Gumuła-Kawęcka; Małgorzata Pruszkowska-Caceres; Lidia Dzierzbicka-Głowacka. 2020. "Evaluation of the Influence of Farming Practices and Land Use on Groundwater Resources in a Coastal Multi-Aquifer System in Puck Region (Northern Poland)." Water 12, no. 4: 1042.

Journal article
Published: 16 March 2019 in Water
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This study focused on the estimation of groundwater recharge rates and travel time of conservative contaminants between ground surface and aquifer. Numerical simulations of transient water flow and solute transport were performed using the SWAP computer program for 10 layered soil profiles, composed of materials ranging from gravel to clay. In particular, sensitivity of the results to the thickness and position of weakly permeable soil layers was carried out. Daily weather data set from Gdańsk (northern Poland) was used as the boundary condition. Two types of cover were considered, bare soil and grass, simulated with dynamic growth model. The results obtained with unsteady flow and transport model were compared with simpler methods for travel time estimation, based on the assumptions of steady flow and purely advective transport. The simplified methods were in reasonably good agreement with the transient modelling approach for coarse textured soils but tended to overestimate the travel time if a layer of fine textured soil was present near the surface. Thus, care should be taken when using the simplified methods to estimate vadose zone travel time and vulnerability of the underlying aquifers.

ACS Style

Adam Szymkiewicz; Julien Savard; Beata Jaworska-Szulc. Numerical Analysis of Recharge Rates and Contaminant Travel Time in Layered Unsaturated Soils. Water 2019, 11, 545 .

AMA Style

Adam Szymkiewicz, Julien Savard, Beata Jaworska-Szulc. Numerical Analysis of Recharge Rates and Contaminant Travel Time in Layered Unsaturated Soils. Water. 2019; 11 (3):545.

Chicago/Turabian Style

Adam Szymkiewicz; Julien Savard; Beata Jaworska-Szulc. 2019. "Numerical Analysis of Recharge Rates and Contaminant Travel Time in Layered Unsaturated Soils." Water 11, no. 3: 545.

Journal article
Published: 01 December 2018 in Archives of Hydro-Engineering and Environmental Mechanics
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In this paper we describe a numerical model of transient water flow in unsaturated expansive soils and the resulting soil volume change. The unsaturated flow equation is solved in a 2D domain using a finite-volume method and an explicit time discretization scheme. Strains in the soil mass are calculated by two simplified approaches, assuming that the strain state is either 1D (in the vertical direction only) or 2D with equal strains in horizontal and vertical directions. The model is applied to two cases described in the literature, in which the strains were computed from the solution of the stress equilibrium equation. It is shown that the simplified methods give results which are reasonably close to the more complex approach based on the equilibrium equations. The proposed model can be used to predict time-varying soil shrinkage and swelling caused by natural and anthropogenic factors.

ACS Style

Sławomir Michalski; Adam Szymkiewicz. Numerical Modeling of Water Flow in Expansive Soils with Simplified Description of Soil Deformation. Archives of Hydro-Engineering and Environmental Mechanics 2018, 65, 301 -313.

AMA Style

Sławomir Michalski, Adam Szymkiewicz. Numerical Modeling of Water Flow in Expansive Soils with Simplified Description of Soil Deformation. Archives of Hydro-Engineering and Environmental Mechanics. 2018; 65 (4):301-313.

Chicago/Turabian Style

Sławomir Michalski; Adam Szymkiewicz. 2018. "Numerical Modeling of Water Flow in Expansive Soils with Simplified Description of Soil Deformation." Archives of Hydro-Engineering and Environmental Mechanics 65, no. 4: 301-313.

Journal article
Published: 10 October 2018 in Water
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Estimation of contaminant travel time through the vadose zone is needed for assessing groundwater vulnerability to pollution, planning monitoring and remediation activities or predicting the effect of land use change or climate change on groundwater quality. The travel time can be obtained from numerical simulations of transient flow and transport in the unsaturated soil profile, which typically require a large amount of data and considerable computational effort. Alternatively, one can use simpler analytical methods based on the assumptions of steady water flow and purely advective transport. In this study, we compared travel times obtained with transient and steady-state approaches for several scenarios. Transient simulations were carried out using the HYDRUS-1D computer program for two types of homogeneous soil profiles (sand and clay loam), two types of land cover (bare soil and grass) and two values of dispersion constant. It was shown that the presence of root zone and the dispersion constant significantly affect the results. We also computed the travel times using six simplified methods proposed in the literature. None of these methods was in good agreement with transient simulations for all scenarios and the discrepancies were particularly large for the case of clay loam with grass cover.

ACS Style

Adam Szymkiewicz; Anna Gumuła-Kawęcka; Dawid Potrykus; Beata Jaworska-Szulc; Małgorzata Pruszkowska-Caceres; Wioletta Gorczewska-Langner. Estimation of Conservative Contaminant Travel Time through Vadose Zone Based on Transient and Steady Flow Approaches. Water 2018, 10, 1417 .

AMA Style

Adam Szymkiewicz, Anna Gumuła-Kawęcka, Dawid Potrykus, Beata Jaworska-Szulc, Małgorzata Pruszkowska-Caceres, Wioletta Gorczewska-Langner. Estimation of Conservative Contaminant Travel Time through Vadose Zone Based on Transient and Steady Flow Approaches. Water. 2018; 10 (10):1417.

Chicago/Turabian Style

Adam Szymkiewicz; Anna Gumuła-Kawęcka; Dawid Potrykus; Beata Jaworska-Szulc; Małgorzata Pruszkowska-Caceres; Wioletta Gorczewska-Langner. 2018. "Estimation of Conservative Contaminant Travel Time through Vadose Zone Based on Transient and Steady Flow Approaches." Water 10, no. 10: 1417.