Current Insights into Nonuniform Flow across Scales, Processes, and Applications

Najm, Majdi Abou; Lassabatère, Laurent; Stewart, Ryan D.

doi:10.2136/vzj2019.10.0113

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…Water recharge processes can be divided into slow uniform movements of water through smaller pores, and fast non-uniform water movement along larger and more active pathways referred to as preferential flow. 101 Preferential flow can contribute to the rapid transport of contaminants from the soil surface into receiving streams, bypassing the filtering capacity of the soil. 102 Developing appropriate approaches to study preferential water movement is a prerequisite to understanding groundwater recharge processes.…”

Section: Soil Water and Hydrologymentioning

confidence: 99%

Soil Science Challenges in a New Era: A Transdisciplinary Overview of Relevant Topics

Rodrigo‐Comino

López‐Vicente

Kumar³

et al. 2020

Air, Soil and Water Research

101

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Transdisciplinary approaches that provide holistic views are essential to properly understand soil processes and the importance of soil to society and will be crucial in the future to integrate distinct disciplines into soil studies. A myriad of challenges faces soil science at the beginning of the 2020s. The main aim of this overview is to assess past achievements and current challenges regarding soil threats such as erosion and soil contamination related to different United Nations sustainable development goals (SDGs) including (1) sustainable food production, (2) ensure healthy lives and reduce environmental risks (SDG3), (3) ensure water availability (SDG6), and (4) enhanced soil carbon sequestration because of climate change (SDG13). Twenty experts from different disciplines related to soil sciences offer perspectives on important research directions. Special attention must be paid to some concerns such as (1) effective soil conservation strategies; (2) new computational technologies, models, and in situ measurements that will bring new insights to in-soil process at spatiotemporal scales, their relationships, dynamics, and thresholds; (3) impacts of human activities, wildfires, and climate change on soil microorganisms and thereby on biogeochemical cycles and water relationships; (4) microplastics as a new potential pollutant; (5) the development of green technologies for soil rehabilitation; and (6) the reduction of greenhouse gas emissions by simultaneous soil carbon sequestration and reduction in nitrous oxide emission. Manuscripts on topics such as these are particularly welcomed in Air, Soil and Water Research.

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Section: Soil Water and Hydrologymentioning

confidence: 99%

Soil Science Challenges in a New Era: A Transdisciplinary Overview of Relevant Topics

Rodrigo‐Comino

López‐Vicente

Kumar³

et al. 2020

Air, Soil and Water Research

101

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“…The discussion has gradually moved from macropore flow to preferential flow that summarizes all the flows in unsaturated porous media not obeying the Richards equation [4]. Numerous reviews on macropore flows, preferential flows, non-equilibrium flows, and non-uniform flows in permeable media appear periodically, and only the latest are here referenced [5,27].…”

Section: Dual Porosity Approachesmentioning

confidence: 99%

Viscosity Controls Rapid Infiltration and Drainage, Not the Macropores

Germann

2020

Water

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The paper argues that universal approaches to infiltration and drainage in permeable media pivoting around capillarity and leading to dual porosity, non-equilibrium, or preferential flow need to be replaced by a dual process approach. One process has to account for relatively fast infiltration and drainage based on Newton's viscous shear flow, while the other one draws from capillarity and is responsible for storage and relatively slow redistribution of soil water. Already in the second half of the 19th Century were two separate processes postulated, however, Buckingham's and Richards' apparent universal capillarity-based approaches to the flow and storage of water in soils dominated. The paper introduces the basics of Newton's shear flow in permeable media. It then presents experimental applications, and explores the relationships of Newton's shear flow with Darcy's law, Forchheimer's and Richards' equations, and finally extends to the transport of solutes and particles.

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“…Infiltration models typically include the assumptions that the sampled porous medium is rigid, homogeneous, isotropic, and has a uniform water content before the experiment (Angulo-Jaramillo et al, 2016). However, these conditions are more the exception than the rule, and for structured and other heterogeneous soils, water generally moves non-uniformly, leading to spatially irregular wetting of the soil profile (Abou Najm et al, 2019;Gerke, 2006). Different types of soil heterogeneity (e.g., water-repellent or sealed soils, multiporosity and multi-permeability systems, porous media possessing regions with distinct particle types or sizes) can induce non-uniform and preferential flow phenomena (e.g., Lassabatere et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Coupling time-lapse ground penetrating radar surveys and infiltration experiments to characterize two types of non-uniform flow

Prima

Giannini

Roder

et al. 2022

Science of The Total Environment

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Current Insights into Nonuniform Flow across Scales, Processes, and Applications

Cited by 7 publications

References 18 publications

Soil Science Challenges in a New Era: A Transdisciplinary Overview of Relevant Topics

Soil Science Challenges in a New Era: A Transdisciplinary Overview of Relevant Topics

Viscosity Controls Rapid Infiltration and Drainage, Not the Macropores

Coupling time-lapse ground penetrating radar surveys and infiltration experiments to characterize two types of non-uniform flow

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