Landform characterization using geophysics—Recent advances, applications, and emerging tools

Dam, Remke L. Van

doi:10.1016/j.geomorph.2010.09.005

Cited by 108 publications

(35 citation statements)

References 155 publications

(167 reference statements)

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“…A and B). In the lower course of the Obra River (Słowik ), where the content of silt fraction ranged from 5% to 8% of the whole grain size spectrum (Fig. C), the GPR traces illustrated the fluvial architecture well at depths reaching 8.0 m b.l.s.…”

Section: Discussionmentioning

confidence: 97%

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Analysis of fluvial, lacustrine and anthropogenic landforms by means of ground‐penetrating radar (GPR): field experiment

Słowik

2014

Near Surface Geophysics

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A field experiment aiming to study the influence of measurement conditions on depths of penetration and resolution of GPR surveys was conducted in the middle Obra valley (western Poland). The tests were carried out along five profile lines in three sites representing fluvial, lacustrine and anthropogenic landforms. The GPR surveys were conducted at various hydrogeological conditions: high and low groundwater levels, and in winter conditions when the ground was under snow/ice cover and frozen. The best measurement conditions for imaging the internal structure of fluvial landforms were found during a period of low groundwater levels. At high groundwater levels the bottom parts of radar profiles were obscured by reverberations originating from the differences in the water content between unsaturated and saturated parts of the studied sections. Some sedimentary structures within lacustrine landforms were better seen at high levels when all the deposits were saturated. In winter conditions, high quality radar profiles were obtained only when measurements were conducted on an elevated, anthropogenic landform, unaffected by dispersion and attenuation of the radar signal in the other landforms due to a water layer situated between the ice cover and land surface. It was also shown that it is possible to image sedimentary structures of landforms built of deposits with significant admixtures of silts, although the depths of penetration are reduced in such cases.

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Section: Discussionmentioning

confidence: 97%

“…The influence of admixtures of silt on the depth of penetration was illustrated by a comparison of the 250MHz GPR sections and traces representing fluvial environment shown by Słowik () and in site III, showing deposits of former lake bays (Fig. A and B).…”

Section: Discussionmentioning

confidence: 99%

Analysis of fluvial, lacustrine and anthropogenic landforms by means of ground‐penetrating radar (GPR): field experiment

Słowik

2014

Near Surface Geophysics

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“…All the pseudo-inverted resistivity data used L2-norm also known as least squares method [17] and quadratic optimization method [24,25]. If root means square (RMS) (Equations (3) or (5) or (6)) is still high (>5% or 10%) then the inversion process is tried again.…”

Section: Processing Data Ves and 2d Mappingmentioning

confidence: 99%

The Isopach Mapping of Volcanic Deposits of Mount Samalas 1257 AD Based on the Values of Resistivity and Physical Properties

et al. 2017

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A detailed study had been conducted on the sediment of Mount Samalas' volcanic eruption in 1257 AD. Using the framework of the reconstruction of the ancient eruption of Mount Samalas, the first step was to map and analyze the deposits of volcanic sediment. Secondly, we analyzed the effect of geomorphology and the distance function to the isopach thickness. The results show that a combination of methods allowed to provide a high resolution map of the distribution of the thickness of the volcanic deposits, both on the slope and in alluvial areas. Geo-electric survey results (both Vertical Electric Sound (VES) and 2D mapping) show consistent changes in the pattern of contrast resistivity layer interface, for all areas. The pattern changes in a row of the top layer, the high resistivity turned into the low. Furthermore, the second and third layer interface changes from low to the high resistivity. High resistivity on the top layer is interpreted as a layer of unconsolidated volcanic sediment. High resistivity values are range from 736 to 2000 Ohm.m on the top layer in the area of the slopes while in the area of alluvial, the resistivity values range from 20 to 958 Ohm.m. Generally, the volcanic deposits in the area of the slopes have a higher value of isopach (>17 m) than in areas of alluvial (<25 m). The geomorphology seemed to have no significant effect on the isopach value, particularly pyroclastic fallout. Such is the case with distance from the source to the site, which is not linear. The value of isopach increases westward from 21 to 31 km, in contrast to the East, which began to occur at a distance of 14 km to 21 km.

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“…With the advent of various geophysical methods as a tool to explore subsurface geology, seismologists and engineers have begun to venture this challenging terrain. As pointed out by Van Dam (2012), geophysical techniques require less time and effort, and Open Access *Correspondence: riturajnath14@gmail.com Department of Earthquake Engineering, IIT Roorkee, Roorkee 247667, India the easy processing of the obtained data are the primary factors behind their popularity. The proliferation in technical innovation as computers, software technology and light weight equipments also influence the increasing interest in geophysical explorations.…”

Section: Introductionmentioning

confidence: 99%

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

et al. 2018

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It has now been well established that the depth of bedrock is a key parameter in assessing the impact of local site conditions on seismic hazard analysis. Where conventional geotechnical testing like standard penetration test (SPT) or cone penetration test (CPT) requires a far greater cost and manpower to be used for such purposes, geophysical testing like ground-penetrating radar (GPR) and multichannel analysis of surface waves (MASW) may provide the researchers with more viable options to achieve conclusive evidence on bedrock depth. Application of geophysical techniques has become more and more extensive and advanced in many geo-morphological studies since the early 2000s. Geophysical techniques require less time and effort, and the easy processing of the obtained data is the primary reason for their popularity. However, due to variability in subsoil mechanical properties, wave attenuation and dispersion and diverse geological boundary conditions, the results obtained through geophysical techniques are often ambiguous and non-unique. The interpretation of the obtained data also requires skill and experience, as the range may vary widely and more often than not consensus is difficult to achieve. In this paper, an endeavor has been made to coalesce the results of two widely used geophysical techniques, namely GPR and MASW to derive more conclusive evidence for the detection of bedrock depth in a part of Garhwal Himalayas. The study area comprises of two different cities of Uttarakhand, India. Both the sites possess different geo-morphological attributes and thus prove to be a perfect platform to conduct the experimentations. Both GPR and MASW testing have been performed and results are shown in graphical format. A comparison of the GPR survey with a conventional geotechnical testing (SPT) is also presented here. This study shows that GPR and MASW can provide complementary results in estimating bedrock depth.

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Landform characterization using geophysics—Recent advances, applications, and emerging tools

Cited by 108 publications

References 155 publications

Analysis of fluvial, lacustrine and anthropogenic landforms by means of ground‐penetrating radar (GPR): field experiment

Analysis of fluvial, lacustrine and anthropogenic landforms by means of ground‐penetrating radar (GPR): field experiment

The Isopach Mapping of Volcanic Deposits of Mount Samalas 1257 AD Based on the Values of Resistivity and Physical Properties

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

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