Inferring the interconnections between surface water bodies, tile-drains and an unconfined aquifer-aquitard system: A case study

JOURNAL OF HYDROLOGY

卷:537

Article

Colombani, N.¹  Di Giuseppe, D.²  Faccini, B.²  Ferretti, G.²  Mastrocicco, M.³  Coltorti, M.² 

[1] Univ Roma La Sapienza, Dept Earth Sci, Ple A Moro 5, I-00185 Rome, Italy

[2] Univ Ferrara, Dept Phys & Earth Sci, Via Saragat 1, I-44122 Ferrara, Italy

[3] Univ Naples 2, Dept Environm Biol & Pharmaceut Sci & Technol, Via Vivaldi 43, I-81100 Caserta, Italy

关键词: Modelling;    Groundwater;    Salinization;    Monitoring;    Lowland landscape;    Drainage;   

DOI  :  10.1016/j.jhydrol.2016.03.046

来源: Elsevier

【 摘 要 】

Shallow lenses in reclaimed coastal areas are precious sources of freshwater for crop development, but their seasonal behaviour is seldom known in tile-drained fields. In this study, field monitoring and numerical modelling provide a robust conceptual model of these complex environments. Crop and meteorological data are used to implement an unsaturated flow model to reconstruct daily recharge. Groundwater fluxes and salinity, water table elevation, tile-drains' discharge and salinity are used to calibrate a 2D density-dependent numerical model to quantify non-reactive solute transport within the aquifer-aquitard system. Results suggest that lateral fluxes in low hydraulic conductivity sediments are limited, while water table fluctuation is significant. The use of depth-integrated monitoring to calibrate the model results in poor efficiency, while multi-level soil profiles are crucial to define the mixing zone between fresh and brackish groundwater. Measured fluxes and chloride concentrations from tile drains not fully compare with calculated ones due to preferential flow through cracks. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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