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  • Author(s):
    Bolster, Diogo, Sherman, Thomas, Sole-Mari, Guillem, Sweeney, Matthew R., Vassallo, Daniel, Hyman, Jeffrey
    Abstract:

    While several studies have linked network and in-fracture scale properties to conservative transport behavior in subsurface fractured media, studies on reactive transport cases remain relatively underdeveloped. In this study, we explore the behavior of an irreversible kinetic reaction during the interaction of two solute plumes, one consisting of species A and the other species B. When the plumes converge, these species react kinetically to form a new species C via A + B -> C. This reactiv…

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  • Author(s):
    Bolster, Diogo, Porta, Giovanni M., Guedon, Gael Raymond, Sherman, Thomas, Bianchi Janetti, Emanuela
    Abstract:

    We propose an approach to upscale solute transport in spatially periodic porous media. Our methodology relies on pore-scale information to predict large-scale transport features, including explicit reconstruction of the solute plume, breakthrough curves at fixed distances, and spatial spreading transverse to the main flow direction. The proposed approach is grounded on the recently proposed trajectory-based spatial Markov model (tSMM), which upscales transport based on information collected f…

    Date Published:
    2020-12-01
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  • Author(s):
    Engdahl, Nicholas B., Bolster, Diogo, Porta, Giovanni, Sherman, Thomas
    Abstract:

    Heterogeneity across a broad range of scales in geologic porous media often manifests in observations of non-Fickian or anomalous transport. While traditional anomalous transport models can successfully make predictions in certain geological systems, increasing evidence suggests that assumptions relating to independent and identically distributed increments constrain where and when they can be reliably applied. A relatively novel model, the Spatial Markov model (SMM), relaxes the assumption o…

    Date Published:
    2021-01-01
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  • Author(s):
    Hanrahan, Brittany R., Tank, Jennifer L., Shogren, Arial J., Bolster, Diogo
    Abstract:

    The transport and retention of fine particulate organic matter (FPOM) in headwater streams plays a significant role in organic matter processing and represents a critical link between upstream and downstream systems. Benthic biofilms potentially alter substrate characteristics and dynamics. However, the influence of biofilm colonization on FPOM retention has not been well documented, likely due to inherent heterogeneity of natural systems. We expected that biofilm growth would either enhance …

    Date Created:
    2020-03-01
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  • Author(s):
    Schmidt, Michael J., Engdahl, Nicholas B., Pankavich, Stephen D., Navarre-Sitchler, Alexis, Bolster, Diogo, Benson, David A.
    Abstract:

    Geochemical systems are known to exhibit highly variable spatiotemporal behavior. This may be observed both in non-smooth concentration curves in space for a single sampling time and also in variability between samples taken from the same location at different times. However, most models that are designed to simulate these systems provide only single-solution smooth curves and fail to capture the noise and variability seen in the data. We apply a recently developed reactive particle-tracking …

    Date Created:
    2020-10-01
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  • Author(s):
    VanNess, Kurt, Johnson, William P., Rasmuson, Anna, Erickson, Brock, Ron, Cesar, Peters, Brett, Bolster, Diogo
    Abstract:

    Nanoparticle and microplastic (colloid) transport behaviors impact strategies for groundwater protection and remediation. Complex colloid transport behaviors of anionic nano- and micro-sized colloids have been previously elucidated via independent experiments in chemically-cleaned and amended granular media with grain sizes in the range of fine to coarse sand (e.g., 200-1000 um). Such experiments show that under conditions where a repulsive barrier was present in colloid-collector interaction…

    Date Created:
    2020-09-01
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  • Author(s):
    Biswas, Subir, Penny, Gopal, Mondal, M. Shahjahan, Bolster, Diogo, Tank, Jennifer L., Mueller, Marc F.
    Abstract:

    The effect of environmental policy on water resources is often challenging to evaluate due to dynamic interactions between people and water, particularly in data-scarce watersheds. Increasing interactions between society and hydrology present a need to understand causal relations for improved assessment and prediction in complex human-water systems. Conventional approaches to causal assessment in hydrology are sometimes insufficient due to data scarcity or system complexity. We argue that nat…

    Date Created:
    2020-04-01
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  • Author(s):
    Kelly, James F., Sun, Liwei, Niu, Jie, Phanikumar, Mantha S., Hu, Bill X., Bolster, Diogo, Qiu, Han
    Abstract:

    Continuous time random walks (CTRW), multi-rate mass transfer (MRMT), and fractional advection-dispersion equations (FADEs) are three promising models of anomalous transport as commonly found in natural streams. Although these paradigms are mathematically related, understanding their advantages and limitations poses a challenge for model selection. In this paper, we quantitatively evaluate the advection-dispersion equation (ADE), fractional-mobile-immobile (FMIM), fractional-in-space ADE (sFA…

    Date Created:
    2020-03-01
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  • Author(s):
    Sole-Mari, Guillem, Sanchez-Vila, Xavier, Bolster, Diogo, Fernandez-Garcia, Daniel
    Abstract:

    The presence of solute concentration fluctuations at spatial scales much below the scale of resolution is a major challenge for modeling reactive transport in porous media. Overlooking small-scale fluctuations, which is the usual procedure, often results in strong disagreements between field observations and model predictions, including, but not limited to, the overestimation of effective reaction rates. Existing innovative approaches that account for local reactant segregation do not provide…

    Date Created:
    2020-08-01
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  • Author(s):
    Reid, Jeffrey S., Sherman, Thomas, Park, Hyungwon John, Freire, Livia S., Xian, Peng, Richter, David H., Wang, Guiquan, Sorooshian, Armin, Bolster, Diogo
    Abstract:

    In an effort to better represent aerosol transport in mesoscale and global-scale models, large eddy simulations (LES) from the National Center for Atmospheric Research (NCAR) Turbulence with Particles (NTLP) code are used to develop a Markov chain random walk model that predicts aerosol particle profiles in a cloud-free marine atmospheric boundary layer (MABL). The evolution of vertical concentration profiles are simulated for a range of aerosol particle sizes and in a neutral and an unstable…

    Date Created:
    2020-10-16
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  • Author(s):
    Engdahl, Nicholas B., Bolster, Diogo
    Abstract:

    Transport processes in watersheds remain challenging to describe accurately with upscaled models because of their intricate complexities at multiple scales that can lead to mull-modal, non-Fickian breakthrough curves. One of the recent advances in solute transport modeling has been the Lagrangian spatial Markov model (SMM), which describes transport using velocity increments and models the correlated transitions between them. The approach has been applied previously to saturated porous media …

    Date Created:
    2020-04-01
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  • Author(s):
    Sherman, Thomas, Dentz, Marco, Hyman, Jeffrey, Bolster, Diogo
    Abstract:

    The topology of natural fracture networks is inherently linked to the structure of the fluid velocity field and transport therein. Here we study the impact of network density on flow and transport behaviors. We stochastically generate fracture networks of varying density and simulate flow and transport with a discrete fracture network model, which fully resolves network topology at the fracture scale. We study conservative solute trajectories with Lagrangian particle tracking and find that as…

    Date Created:
    2020-01-01
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