Stratigraphy and soil properties of fens: Geophysical case studies from northeastern Germany

Walter, J.; Hamann, Göran; Lück, Erika; Klingenfuss, Christian; Zeitz, Jutta

doi:10.1016/j.catena.2016.02.028

Cited by 25 publications

(28 citation statements)

References 33 publications

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“…These laboratory tests have not been explicitly confirmed by the field surveys presented in this paper. This results probably from the spatial variability of the peatland and influence of individual factors (such as moisture content, ash The ERI method may be useful for determining the stratigraphic contact between the peat layer and the mineral substrate (Slater and Reeve 2002;Comas et al 2015;Walter et al 2016), which is also confirmed by this report.…”

Section: Discussionsupporting

confidence: 82%

“…Peatlands are investigated mostly using the ground penetrating radar (GPR) method. Only a few researchers (e.g., Slater and Reeve 2002;Comas et al 2015;Walter et al 2016) have applied induced polarization imaging, electromagnetic terrain conductivity and electrical resistivity imaging, apart from the GPR method, as alternative tools to determine the peatland thickness.…”

Section: Introductionmentioning

confidence: 99%

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Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

et al. 2017

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Complex studies were carried out to recognize the fen structure and peat properties in the Całowanie Fen area, belonging to the Natura 2000 network. The studies were conducted in two study areas that differ significantly in terms of peat thickness. Electrical resistivity imaging (ERI) was used to identify the properties of the peat and its substrate, such as thickness and electrical resistivity. Comparison of the field studies with the laboratory tests has shown that the ash content rises electrical resistivity in peat. In addition, the study has shown that the application of non-invasive geophysical methods in protected areas is justified. The fen, as a medium containing mostly water, was a proper test area for the ERI measurements.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

et al. 2017

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“…; Walter et al . , ) more rapidly and at various spatial scales. When using ERT on peatlands, the electrical conductivity (reciprocal of resistivity) is closely related to the water content (Comas and Slater ; Ponziani et al .…”

Section: Introductionmentioning

confidence: 96%

“…; Walter et al . , ) and peat properties (Comas and Slater ; Kettridge et al . ; Ponziani, Slob and Ngan‐Tillard ; Comas et al .…”

Section: Introductionmentioning

confidence: 99%

Relationship between electrical conductivity and water content of peat and gyttja: implications for electrical surveys of drained peatlands

Walter

Lück

Heller

et al. 2019

Near Surface Geophysics

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The application of electrical resistivity tomography to peatlands supports conventional coring by providing data on the current condition of peatlands, including data on stratigraphy, peat properties and thickness of organic deposits. Data on the current condition of drained peatlands are particularly required to improve estimates of carbon storage as well as losses and emissions from agriculturally used peatlands. However, most of the studies focusing on electrical resistivity tomography surveys have been conducted on natural peatlands with higher groundwater levels. Peatlands drained for agriculture have not often been studied using geophysical techniques. Drained sites are characterized by low groundwater levels and high groundwater fluctuations during the year, which lead to varying levels of water saturation. To validate better electrical resistivity tomography surveys of drained peatlands, the aim of this laboratory study is to investigate the influence of varying water saturation levels on electrical conductivity (reciprocal of resistivity) for a variety of peat and gyttja types, as well as for different degrees of peat decomposition. Results show that different levels of water saturation strongly influence bulk electrical conductivity. Distinct differences in this relationship exist between peat and gyttja substrates and between different degrees of peat decomposition. Peat shows an exponential relationship for all degrees of decomposition, whereas gyttja, in particular organic‐rich gyttja, is characterized by a rather unimodal relationship. The slopes for the relationship between electrical conductivity and water content are steeper at high degrees of decomposition than for peat of low degrees of decomposition. These results have direct implications for field electrical resistivity tomography surveys. In drained peatlands that are strongly susceptible to drying, electrical resistivity tomography surveys have a high potential to monitor the actual field water content. In addition, at comparable water saturations, high or low degrees of decomposition can be inferred from electrical conductivity.

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“…2004; Kowalczyk and Mieszkowski, 2011;Comas et al, 2015;Walter et al, 2016) and at present more frequently for recognizing the extent of organic soils in the foundations of designed investments (Maślakowski et al, 2014a;Pasierb and Nawrocki, 2015). Electrical resistivity imaging (ERI) is often used in the recognition of complex geological conditions in investigations of the foundations of roads and motorways (Ganerød et al, 2006;Maślakowski et al, 2014a;Ngan-Tillard et al, 2010;Osinowo et al, 2011;Wisén et al, 2008;Kowalczyk et al, 2017).…”

mentioning

confidence: 99%

Application of the electrical resistivity method in assessing soil for the foundation of bridge structures: a case study from the Warsaw environs, Poland

Kowalczyk¹

2017

Acta Geodynamica Et Geomaterialia

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The paper presents an application of the geoelectrical method in organic soils occurring in the area of a designed investment. Two techniques have been applied: electrical resistivity imaging (ERI) and measurements with a resistivity cone penetration test (RCPT). ERI measurements made using Schlumberger and gradient arrays have allowed to obtain a two-dimensional image of resistivity variability in the soil medium. RCPT measurements have enabled an accurate observation of vertical changes in electrical resistivity (or conductivity) in the soil medium in selected measurement points. Electrical resistivity is a physical parameter that may reflect the variability of the geological medium with regard to lithology if the range of conductivity of water filling the pore space is narrow. When it is properly calibrated with borehole data, ERI interpretation allows to determine the boundaries between different soil layers. Adaptation of the "cumulative resistivity" method to RCPT data enabled to distinguish layers characterized by different physical properties and corresponding to boundaries of geological-engineering layers. ERI and RCPT measurements conducted during expressway construction have contributed to the recognition of soils of low bearing capacity such as organic soils (peats, gyttja and aggradate muds). ARTICLE INFO

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Stratigraphy and soil properties of fens: Geophysical case studies from northeastern Germany

Cited by 25 publications

References 33 publications

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

Relationship between electrical conductivity and water content of peat and gyttja: implications for electrical surveys of drained peatlands

Application of the electrical resistivity method in assessing soil for the foundation of bridge structures: a case study from the Warsaw environs, Poland

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