Is Our Ground-Water Monitoring Strategy Illogical?

Cullen, Stephen J.; Kramer, John H.; Everett, Lorne G.; Eccles, Lawrence A.

doi:10.1201/9780203752524-1

Cited by 2 publications

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“…Transit time distributions (TTDs), defined as the distribution of the age of water parcels at their exit through drainage/streamflow or evapotranspiration, are widely accepted as the tool to quantify storage or release of solutes (Botter et al, ; Kirchner et al, ; McGuire & McDonnell, ; Rinaldo et al, ; Sprenger et al, ). As factors like urbanization and climate change urge us to be proactive in our assessment of the possible impacts on water quality (Danesh‐Yazdi et al, ; Sprenger et al, ), the critical zone represents a starting point to estimate the long‐term impact of such changes (Cullen et al, ; Grant & Dietrich, ; Wilson, ).…”

Section: Introductionmentioning

confidence: 99%

Transport and Water Age Dynamics in Soils: A Comparative Study of Spatially Integrated and Spatially Explicit Models

Asadollahi

Stumpp

Rinaldo

et al. 2020

Water Resources Research

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We address transport by transit times (i.e., the age of water parcels leaving a storage as discharge, deep loss, or evapotranspiration) in subvertical soil systems, key to our understanding of water quality in catchments and streams. While the use of field and lysimeter observations to constrain and validate modeling approaches is generally accepted, different views exist on the relative ranges of applicability of spatially integrated or spatially explicit approaches. This study specifically illustrates how one class of spatially integrated models of transport, based on StorAge Selection (SAS) functions, fares with respect to spatially explicit hydrologic models in a case where detailed tracer data from experimental lysimeters exist and for which both approaches are viable. Data from two lysimeters experiments that differ in atmospheric conditions, size of the installation, tracer type, soil texture, and vegetation are used to contrast results from two transport models: tran‐SAS (space implicit) and HYDRUS‐1D (space explicit). Results suggest that although the two lysimeters are characterized by different transit time distributions, their underlying transport mechanisms are similar and represented well by both models. The comparison between the two models results in robust estimates of the transport timescales and clearly shows that percolation fluxes at the bottom of a lysimeter tend to drain the relatively old components of the soil storage. We conclude that the convergence of the approaches in a geomorphologically simple and data‐rich problem supports extensive uses of the spatially integrated approach in cases where the scale of the problem, or subgrid parameterization needs, may limit the applicability of detailed modeling approaches.

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Section: Introductionmentioning

confidence: 99%

Transport and Water Age Dynamics in Soils: A Comparative Study of Spatially Integrated and Spatially Explicit Models

Asadollahi

Stumpp

Rinaldo

et al. 2020

Water Resources Research

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“…The vadose zone is that portion of the geologic profile beneath the earth's surface and above the first principal water-bearing zone (Cullen et al. 1993).…”

Section: Introductionmentioning

confidence: 99%

Field estimation of soil hydraulic and chemical transport properties

Al-Jabri

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V 2.6 Conclusion 39 2.7 Acknowledgments References CHAPTER 3 FIELD DETERMINATION OF SOIL HYDRAULIC AND CHEMICAL TRANSPORT PROPERTIES 3.1 Abstract 3.2 Introduction 3.3 Materials and Methods 51 3.4 Results and Discussions 3.4.1 Hydraulic Properties 3.4.2 Chemical transport properties 3.5 Conclusion 73 References 74 CHAPTER 4 A TDR-BASED METHOD FOR FIELD DETERMI NATION OF CHEMICAL TRANSPORT PROPERTIES 79 4.1 Abstract 79 4.2 Introduction 80 4.3 Theory: Use of TDR to estimate Transport Parameters 83 4.4 Materials and methods 86 4.4.1 Estimation of transport parameters 89 4.4.2 Spatial distribution of transport properties 90 4.5 Results and Discussions 91 4.5.1 Spatial distribution of chemical transport properties 94 4.5.2 Comparison of chemical transport properties with previously re ported values 97 4.6 Conclusion 98 vi References CHAPTER 5 GENERAL CONCLUSIONS 5.1 Recommendations for Future Research Work APPENDIX RAW DATA vii LIST OF FIGURES xi ACKNOWLEDGEMENTS All praise to ALLAH, the Most Gracious the Most Merciful, without His Mercy I won't be able to finish this work. I would like thank all my family members for their prayers, love, support, and en couragements.

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Is Our Ground-Water Monitoring Strategy Illogical?

Cited by 2 publications

References 0 publications

Transport and Water Age Dynamics in Soils: A Comparative Study of Spatially Integrated and Spatially Explicit Models

Transport and Water Age Dynamics in Soils: A Comparative Study of Spatially Integrated and Spatially Explicit Models

Field estimation of soil hydraulic and chemical transport properties

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