Peat Soils

Osman, Khan Towhid

doi:10.1007/978-3-319-75527-4_7

Cited by 4 publications

(1 citation statement)

References 53 publications

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“…In the case under investigation, the hypothesis is that the subsurface consists of a sequence of two lithologies: peat and clay. It is true that, in some cases, peat might overlay more resistive bedrock (Boon et al, 2008;Comas et al, 2015;Kowalczyk et al, 2017), but our assumption is that, anyhow, even in the case of a shallow bedrock, a clay unit is present due to the rock weathering or alluvial/glacial origins (Osman, 2018). In addition, we assume that, for each sounding location, the associated model can be composed of three lithological units, with no restrictions concerning their vertical sequence.…”

Section: Generation Of the Prior Modelsmentioning

confidence: 99%

Probabilistic Petrophysical Reconstruction of Danta's Alpine Peatland via Electromagnetic Induction Data

Zaru,

Silvestri,

Assiri

et al. 2024

Earth and Space Science

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Peatlands are fundamental deposits of organic carbon. Thus, their protection is of crucial importance to avoid emissions from their degradation. Peat is a mixture of organic soil that originates from the accumulation of wetland plants under continuous or cyclical anaerobic conditions for long periods. Hence, a precise quantification of peat deposits is extremely important; for that, remote‐ and proximal‐sensing techniques are excellent candidates. Unfortunately, remote‐sensing can provide information only on the few shallowest centimeters, whereas peatlands often extend to several meters in depth. In addition, peatlands are usually characterized by difficult (flooded) terrains. So, frequency‐domain electromagnetic instruments, as they are compact and contactless, seem to be the ideal solution for the quantitative assessment of the extension and geometry of peatlands. Generally, electromagnetic methods are used to infer the electrical resistivity of the subsurface. In turn, the resistivity distribution can, in principle, be interpreted to infer the morphology of the peatland. Here, to some extent, we show how to shortcut the process and include the expectation and uncertainty regarding the peat resistivity directly into a probabilistic inversion workflow. The present approach allows for retrieving what really matters: the spatial distribution of the probability of peat occurrence, rather than the mere electrical resistivity. To evaluate the efficiency and effectiveness of the proposed probabilistic approach, we compare the outcomes against the more traditional deterministic fully nonlinear (Occam's) inversion and against some boreholes available in the investigated area.

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Section: Generation Of the Prior Modelsmentioning

confidence: 99%

Probabilistic Petrophysical Reconstruction of Danta's Alpine Peatland via Electromagnetic Induction Data

Zaru,

Silvestri,

Assiri

et al. 2024

Earth and Space Science

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A First Assessment of Greenhouse Gas Emissions From Agricultural Peatlands in Canada: Evaluation of Climate Change Mitigation Potential

Strack,

Bona,

Liang

2024

WIREs Climate Change

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Canada has a quarter of the world's peatlands accounting for an estimated 150 Gt of stored carbon. While over 98% of Canadian peatlands are intact, agriculture has been estimated as accounting for the greatest peatland disturbance by area. Greenhouse gas (GHG) emissions from peatland agriculture can contribute a large proportion of national anthropogenic emissions for some countries. In Canada, estimates of GHG emissions from cultivated peat soils are incomplete. Improved accounting of these GHG emissions is required to inform decisions about where to deploy ecological restoration projects and where to allow future agricultural expansion as climate warms. Compiled studies that measured GHG fluxes from agricultural peat fields in Canada resulted in mean emissions factors of 5.1 t CO2e ha−1 year−1, −0.12 kg CH4 ha−1 year−1, and 14.3 kg N2O‐N ha−1 year−1 for carbon dioxide, methane, and nitrous oxide, respectively. Combining these values with a compilation of estimates of agricultural peatland disturbance area in Canada, GHG emissions estimates in Canada arising from peatland converted to agriculture remain highly uncertain, ranging from 1.4 to 35 Mt CO2e year−1, with a median value near 18 Mt CO2e year−1. The largest contributor to this wide range of estimates is uncertainty peatland area affected, indicating an urgent need to improving mapping of organic soils under agriculture in Canada. To help guide decision‐making in Canada, we recommend a network of research stations across a range of agricultural management intensities and climate regions for monitoring hydrological conditions and GHG exchange on organic soils affected by agriculture.

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Effect of Biochar Filler on the Hydration Products and Microstructure in Portland Cement–Stabilized Peat

Berti

Biscontin

Lau

2021

J. Mater. Civ. Eng.

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Laboratory tests demonstrated that biochar filler added to Portland cement stabilized peat results in an increase of unconfined compressive strength, comparable with that of a sand filler. Strength increase is significantly higher when biochar is ground to a size below 75 µm. This paper investigates the changes in mineralogy, texture and microstructure during the early hydration of cement mixed with peat and biochar filler to identify the mechanisms responsible for the strength increase. The results show that the biochar surface catalyzes nucleation of hydration products. Labile carbon in biochar promotes carbonation, with precipitation of calcite within its cells and on its surface, as well as formation of hemi and monocarboaluminate, two stable AFm phases. For the ManuscriptClick here to access/download;Manuscript;Manuscript_Sep10_Final.docxBerti, February 8, 2020 larger fragments of biochar, the early hydration products do not reach the inner cells.Instead, the fine fragments tend to be fully covered leading to a more homogeneous spatial distribution of cement and voids.

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Peat Soils

Cited by 4 publications

References 53 publications

Probabilistic Petrophysical Reconstruction of Danta's Alpine Peatland via Electromagnetic Induction Data

Probabilistic Petrophysical Reconstruction of Danta's Alpine Peatland via Electromagnetic Induction Data

A First Assessment of Greenhouse Gas Emissions From Agricultural Peatlands in Canada: Evaluation of Climate Change Mitigation Potential

Effect of Biochar Filler on the Hydration Products and Microstructure in Portland Cement–Stabilized Peat

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