Laboratory and numerical study of hyporheic flow-mediated DNAPL dissolution in karst conduits

Wu, Yuexia; Hunkeler, Daniel; Goldscheider, Nico

doi:10.1007/s10040-018-1858-3

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…Pipe/fracture network models include a wide range of LSMs (Table S4) constructed by using an artificial fracture (Hasiuk et al 2016; Cunningham and Sukop 2011; Hasiuk et al 2018; Qian et al 2007; Tzelepis et al 2015; Qian et al 2011), a pipe (Anger and Alexander 2013; Wu et al 2018), varying diameter tubes with channels (Field and Leij 2012), a set of fractures (Hull et al 1987), and a set of tubes (Anger and Alexander 2013; Karay and Hajnal 2015). These models all ignore the matrix, thus karst flow is simulated with a single or a series of interconnected fractures and/or pipes (Figure 5).…”

Section: Pipe/fracture Network Modelsmentioning

confidence: 99%

Review of Laboratory Scale Models of Karst Aquifers: Approaches, Similitude, and Requirements

Mohammadi¹,

Illman

Field

2020

Groundwater

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This review focuses on investigations of groundwater flow and solute transport in karst aquifers through laboratory scale models (LSMs). In particular, LSMs have been used to generate new data under different hydraulic and contaminant transport conditions, testing of new approaches for site characterization, and providing new insights into flow and transport processes through complex karst aquifers. Due to the increasing need for LSMs to investigate a wide range of issues, associated with flow and solute migration karst aquifers this review attempts to classify, and introduce a framework for constructing a karst aquifer physical model that is more representative of field conditions. The LSMs are categorized into four groups: sand box, rock block, pipe/fracture network, and pipe‐matrix coupling. These groups are compared and their advantages and disadvantages highlighted. The capabilities of such models have been extensively improved by new developments in experimental methods and measurement devices. Newer technologies such as 3D printing, computed tomography scanning, X‐rays, nuclear magnetic resonance, novel geophysical techniques, and use of nanomaterials allow for greater flexibilities in conducting experiments. In order for LSMs to be representative of karst aquifers, a few requirements are introduced: (1) the ability to simulate heterogeneous distributions of karst hydraulic parameters, (2) establish Darcian and non‐Darcian flow regimes and exchange between the matrix and conduits, (3) placement of adequate sampling points and intervals, and (4) achieving some degree of geometric, kinematic, and dynamic similitude to represent field conditions.

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Section: Pipe/fracture Network Modelsmentioning

confidence: 99%

Review of Laboratory Scale Models of Karst Aquifers: Approaches, Similitude, and Requirements

Mohammadi¹,

Illman

Field

2020

Groundwater

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“…The discharge and accidental leakage of dense nonaqueous phase liquid (DNAPL) have caused serious global environmental and health hazards (Mdlovu et al, 2019;Wu et al, 2019;Luo et al, 2020). DNAPL has low water solubility, high density, high toxicity and high interfacial tension, and is difficult to remediate (Hou and Lu, 2018;Hou et al, 2019;Luo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Groundwater DNAPL contamination source-sink analysis research system based on the simulation-random statistical method for a practical case

Wang

2022

Preprint

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Groundwater DNAPL contamination source-sink analysis (GDCSA) has seldom been included in previous research on groundwater DNAPL contamination. In this study, a complete GDCSA research system was first established to include groundwater DNAPL contamination source identification (GDCSI), groundwater DNAPL contamination source-sink response relationship (GDCSRR), and spatial and temporal distribution and quantity (sink) of contamination. The object of most previous GDCSI studies has been a simple hypothetical example in which the contamination source was always generalized as a point. For a complex contamination source that cannot be generalized as a point, identifying its shape depicts the source in actual practical terms and ensures the accuracy of GDCSI. In this case study of a practical dye chemical factory in Hebei Province, China, firstly shape of DNAPL contamination source was identified. Then, GDCSRR was determined based on GDCSI result. Finally, sink of contamination based on GDCSRR was determined. Compared with a single study of GDCSI, this complete GDCSA research system provides a reference for identifying the polluter and also provides a more precise basis for contamination remediation scheme design and contamination risk assessment in practical cases. In this paper, we applied parallel heuristic search iterative process (PHSIP) based on simulation-random statistics method to solve GDCSI. However, the repetitive invocation of numerical simulation model has high computational cost during PHSIP. An effective method is to construct surrogate to emulate the simulation model at low computational cost. However, there is a complex nonlinear mapping relationship between input and output for multiphase flow simulation model with large number of variables and high dimension. The accuracy of a surrogate using shallow learning methods needs to be improved. Therefore, we have introduced deep-belief neural network (DBNN) surrogate to emulate the simulation model. A combination of hypothetical and practical cases was adopted in this study. Test of the proposed approaches for the hypothetical case revealed that the DBNN surrogate approximated the multiphase flow simulation model more closely than shallow learning surrogates, and that the PHSIP obtained accurate identification results. These tested approaches and the GDCSA research system were finally applied to the practical case.

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Quantification of the fluid saturation of three phases of NAPL/Water/Gas in 2D porous media systems using a light transmission technique

Zhang

2021

Journal of Hydrology

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Laboratory and numerical study of hyporheic flow-mediated DNAPL dissolution in karst conduits

Cited by 4 publications

References 36 publications

Review of Laboratory Scale Models of Karst Aquifers: Approaches, Similitude, and Requirements

Review of Laboratory Scale Models of Karst Aquifers: Approaches, Similitude, and Requirements

Groundwater DNAPL contamination source-sink analysis research system based on the simulation-random statistical method for a practical case

Quantification of the fluid saturation of three phases of NAPL/Water/Gas in 2D porous media systems using a light transmission technique

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