Comparing thresholding techniques for quantifying the dual porosity of Indiana Limestone and Pink Dolomite

Freire-Gormaly, Marina; Ellis, Jonathan S.; Bazylak, Aimy; MacLean, Heather L.

doi:10.1016/j.micromeso.2015.01.002

Cited by 31 publications

(18 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies for improved water treatment can be used to address the Arsenic contamination [10] based on the presence of Arsenic contamination. The Arsenic contamination can also permeate between the soils, groundwater system and rock structures, therefore, a thorough understanding of the porous rock and soil structures [11][12][13][14] in Bangladesh are needed. Rapid structures to support the water treatment systems composed of carbon fibre reinforced fibre structures [15][16][17][18] can also be used.…”

Section: A Justification Of the Studymentioning

confidence: 99%

Detection and Mapping of Arsenic Contamination in Bangladesh

Basak¹,

Rashid²,

Mohee³

et al. 2020

Progress in Canadian Mechanical Engineering. Volume 3

Self Cite

View full text Add to dashboard Cite

Arsenic contamination in the groundwater of Bangladesh is of major concern due to the high reliance on groundwater for drinking water, large levels of groundwater extraction for agricultural purposes and the impact of climate change depleting the groundwater table. Although the Sitakunda Distract was earlier considered to be free from Arsenic contamination, recent experimental data shows the Sitakunda District has high Arsenic concentrations. The objective of this work was to identify the Arsenic affected wells in the Sitakunda District, Chittagong, map them in QGIS mapping software and updated Bing imagery using GPS coordinates from GPS Devices and to explore the potential relationship between the present data with past data. The Sitakunda District region wells examined in this study determined the Arsenic concentration to be in the range of 100-500+ ppb which is much higher than the World Health Organization limits (10 ppb) and Bangladesh limit (50ppb). The generated maps in QGIS showed the randomly selected tested tubewells with satellite imagery and their corresponding elevation, yet no precise correlation between Arsenic contamination and land elevation was determined. The results of this study and corresponding satellite map has the potential to identify Arsenic contaminated tubewells for the community members. Future investigations will explore the development of suitable low-cost water treatment technologies to remove the Arsenic contamination.

show abstract

Section: A Justification Of the Studymentioning

confidence: 99%

Detection and Mapping of Arsenic Contamination in Bangladesh

Basak¹,

Rashid²,

Mohee³

et al. 2020

Progress in Canadian Mechanical Engineering. Volume 3

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, climate change modelling shows that extreme events and storms are expected to increase in occurrence and severity [5]. Full scale modelling of thunderstorms to adequately measure wind speeds remains an area of active research [6], [7].…”

Section: A Tornado Occurrence and Risk In Canada Hurricane Occurrencmentioning

confidence: 99%

Modeling Based Study of Impact Loads Generated by Tornadoes and Hurricanes on Safety-critical Structures for Nuclear Structures

Mohee¹,

Kamal²,

Freire-Gormaly³

2020

Progress in Canadian Mechanical Engineering. Volume 3

Self Cite

View full text Add to dashboard Cite

Safety-related buildings and structures for nuclear plants require the design and analysis of tornado and hurricane generated missile impact load. Several Canadian provinces, including Ontario, Quebec, Manitoba, Saskatchewan and Alberta are tornado prone. In Canada during the years 1980 to 2009, a total of 1,217 tornados were observed, including one F5 scale, five F4 scale, 24 F3 scale and 119 F2 scale tornadoes. These tornadoes pose critical risks to nuclear infrastructure due to the potential for missile generated impact loads from debris present in the tornado that can impact the nuclear structures. During the years, 1918 to 2014, seven F4 scale, 18 F3 scale and 126 F2 scale tornadoes were observed in Ontario. Meanwhile, several hurricanes hit the Eastern region provinces of Canada in recent history, including Hurricane Juan in September 2003 in Nova Scotia and Prince Edward Island, and four hurricanes in Nova Scotia and New Brunswick in 1963. In this work, an ANSYS based advanced computational simulation model framework was developed to investigate the effect of the tornado and hurricane generated missile impact load on nuclear structures. The explicit dynamics module in the ANSYS software was used for simulations and the preliminary results are presented. A database of materials and potential missile impact loads were identified for future investigations. For example, concrete, reinforced concrete, steel, and reinforced concrete walls with steel liner are relevant for further study. The 0.158 meter diameter and 4.58 meter long steel pipe missiles in 103 m/sec, 89 m/sec and 72 m/sec maximum wind speeds were also identified for further investigation. Lab based impact loading tests on scaled down samples were also studied.

show abstract

“…Few isolated perfectly euhedral quartz crystals are present as well, as an accessory phase, highlighting the complex recrystallization history of the rock. This microstructure is expected to have a direct impact on the porosity of the system (as emphasized by Freire-Gormaly et al, 2015), and at the scale considered we can identify two main different porosity segments: i) the interstitial porosity (which is above the resolution of the SXR-μCT) can CT measurement) generated by the aggregation structure of the ooliths, and ii) the micro-/nano-porosity generated by the space among the single micro-/nano-calcite crystals, which is below the resolution of the SXR-μCT) can CT measurement. This porosity distribution has potentially a significant impact in the estimate of all the chemical processes depending on the reactive surface area values.…”

Section: Sample Characterization and Preparationmentioning

confidence: 99%

The effect of CO2-induced dissolution on flow properties in Indiana Limestone: An in situ synchrotron X-ray micro-tomography study

Voltolini

Ajo‐Franklin

2019

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

The injection of CO 2-rich fluids in carbonate rocks results in an evolution of the pore space, with consequent changes in the hydraulic properties of the reservoir; how these properties evolve, particularly for parameters relevant to multiphase flow e.g. P c (s), remains a topic of active research despite several decades of study. We have carried out an in situ synchrotron X-ray microtomography experiment to monitor pore structure evolution during dissolution of an Indiana Limestone core; the experiment involved flowing CO 2-saturated water through the core for 36 hours and resulted in 10 volumes corresponding to different temporal stages of the dissolution process. The injection parameters corresponded to the flow velocities expected near the well-bore region of a shallow aqueous CO 2 injection; fast flow rates with high reactant availability. Analysis of the tomographic data shows flow-enhanced dissolution i.e. channeling, and provides a timeresolved map of pore space alteration. Using the resulting 4D pore space volume, we modeled the evolution of capillary-pressure curves; this exercise demonstrates how pore structure evolution could impact the invasion and remobilization of non-wetting fluids, dramatically decreasing the entry pressure and the P C in some parts of the sample. The modeling of permeability, using a Stokes solver approach, quantified the relationship of porosity vs. permeability; we found that a modest increase in porosity, especially when the channeling system is more developed, greatly affects permeability. These results demonstrate how movement of CO 2 saturated brine near injected plumes might alter drainage dynamics near the plume boundary, thus leading to mobilization across subtle capillary barriers.

show abstract

Comparing thresholding techniques for quantifying the dual porosity of Indiana Limestone and Pink Dolomite

Cited by 31 publications

References 40 publications

Detection and Mapping of Arsenic Contamination in Bangladesh

Detection and Mapping of Arsenic Contamination in Bangladesh

Modeling Based Study of Impact Loads Generated by Tornadoes and Hurricanes on Safety-critical Structures for Nuclear Structures

The effect of CO2-induced dissolution on flow properties in Indiana Limestone: An in situ synchrotron X-ray micro-tomography study

Contact Info

Product

Resources

About