Bacteriophages

Sandmeier, H.; Meyer, Jürg

doi:10.1002/9783527620821.ch16

Cited by 7 publications

(4 citation statements)

References 128 publications

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“…The GPR processing sequence is summarized in Table 1. The data were processed using the Reflexw package (Sandmeier Scientific Software;Sandmeier, 2007). Several filtering and gain adjustment operations were performed to enhance the data quality.…”

Section: High-resolution Imaging Of a Carbonate Platform 1373mentioning

confidence: 99%

Integration of sedimentology and ground‐penetrating radar for high‐resolution imaging of a carbonate platform

Jorry¹,

Bièvre

2011

Sedimentology

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International audienceGround-penetrating radar has not been applied widely to the recognition of ancient carbonate platform geometries. This article reports the results of an integrated study performed on an Upper Jurassic outcrop from the south-east Paris basin, where coral bioherms laterally change into prograding depositional sequences. Ground-penetrating radar profiles illustrate the different bedding planes and major erosional unconformities visible at outcrop. A ground-penetrating radar profile conducted at the base of the cliff displays a palaeotopographic surface on which the outcropping bioherms settled. The excellent penetration depths of the ground-penetrating radar (20 m with a monostatic 200 MHz antenna) images the carbonate platform geometries, ranging between outcrop workscale (a few metres) and seismic scale (several hundreds of metres). This study supports recent evidence of icehouse conditions and induced sea-level fluctuations controlling the Upper Jurassic carbonate production

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Section: High-resolution Imaging Of a Carbonate Platform 1373mentioning

confidence: 99%

Integration of sedimentology and ground‐penetrating radar for high‐resolution imaging of a carbonate platform

Jorry¹,

Bièvre

2011

Sedimentology

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“…Raw GPR data were processed using ReflexW v7.5.9 (Sandmeier, 2006). The processing sequence comprised static correction for time‐zero drift, dewow high‐pass filter, background removal and topographic correction (RTK‐derived DEM).…”

Section: Methodsmentioning

confidence: 99%

The evolution and preservation potential of englacial eskers: An example from Breiðamerkurjökull, SE Iceland

Lally

Ruffell

Newton

et al. 2023

Earth Surf Processes Landf

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Directly observing glacial drainage systems (englacial and subglacial) is challenging. The distribution, morphology and internal structure of eskers can provide valuable information about the glacial drainage system and meltwater processes. This work presents the annual evolution (meltout) and internal structure of an esker emerging from the Breiðamerkurjökull ice margin, southeast Iceland. Changes in esker morphology have been repeatedly mapped over a 1‐year period using high temporal and spatial resolution data acquired by an uncrewed aerial vehicle (UAV). The internal architecture of the esker was investigated using ground‐penetrating radar (GPR) surveys. These data are used to identify the dominant processes driving the formation of this englacial esker and to evaluate the preservation potential. The englacial esker was up to 2.6 m thick and ice‐cored. A large moulin upglacier of the esker, which evolved into an englacial conduit, supplied meltwater to the englacial channel. Upglacier dipping debris‐filled basal hydrofractures, formed by pressurised subglacial meltwater rising up the retrograde bed slope, likely supplied sediment to the englacial conduit. Over the 1‐year period of observation the crest morphology evolved from flat‐ to sharp‐crested and the esker footprint increased by a factor of 5.7 in response to post‐depositional processes. The findings presented here indicate that englacial eskers may have low preservation potential due to post‐depositional reworking such as slumping through ice‐core meltout and erosion by later meltwater flow. As englacial eskers may not be preserved in the landscape, they could represent important glacial drainage system components that are not currently captured in palaeo‐ice sheet reconstructions. This work highlights the value of creating a time series of high‐temporal resolution data to quantify morphological evolution and improve glacial process‐form models.

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“…In order to remove the interference signal and improve the signal-to-noise ratio (SNR), the GPR data are processed as follows: static correction, subtract DC shift, bandpass filtering, background removal, and energy gain. The main points of data processing are shown in Figure 4, and the principle can be found in the manual of Reflexw [38]. The on-site detection of GPR in a mountain tunnel is shown in Figure 5.…”

Section: Parameters Determinationmentioning

confidence: 99%

Evaluation of Void Defects behind Tunnel Lining through GPR forward Simulation

Bao

Shen

et al. 2022

Sensors

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Voids, a common defect in tunnel construction, lead to the deterioration of the lining structure and reduce the safety of tunnels. In this study, ground-penetrating radar (GPR) was used in tunnel lining void detection. Based on the finite difference time domain (FDTD) method, a forward model was established to simulate the process of tunnel lining void detection. The area of the forward image and the actual void area was analyzed based on the binarization method. Both the plain concrete and reinforced concrete lining with various sizes of air-filled and water-filled voids were considered. The rationality of the model was verified by measured data. It was observed that the response mode of voids can be hyperbolic, bowl-shaped, and strip-shaped, and this depends on the void’s width. Compared with the air-filled voids, water filling increases the response range of the voids and produces a virtual image. Although the diffracted wave caused by a steel bar will bring about significant interference to the void response, the center position of the voids can be accurately located using 3D GPR.

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Bacteriophages

Cited by 7 publications

References 128 publications

Integration of sedimentology and ground‐penetrating radar for high‐resolution imaging of a carbonate platform

Integration of sedimentology and ground‐penetrating radar for high‐resolution imaging of a carbonate platform

The evolution and preservation potential of englacial eskers: An example from Breiðamerkurjökull, SE Iceland

Evaluation of Void Defects behind Tunnel Lining through GPR forward Simulation

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