scholarly journals Storm response of a mixed sand gravel beach ridge plain under falling relative sea levels: A stratigraphic investigation using ground penetrating radar

2019 ◽  
Vol 44 (8) ◽  
pp. 1610-1617 ◽  
Author(s):  
Sebastian J. Pitman ◽  
Harry M. Jol ◽  
James Shulmeister ◽  
Deirdre E. Hart
Keyword(s):  
Ground Penetrating Radar ◽  
Beach Ridge ◽  
Sea Levels ◽  
Storm Response ◽  
Ground Penetrating ◽  
Gravel Beach

scholarly journals Sea-level proxies in Holocene raised beach ridge deposits (Greenland) revealed by ground-penetrating radar

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Lars Nielsen ◽  
Mette Bendixen ◽  
Aart Kroon ◽  
Mikkel Ulfeldt Hede ◽  
Lars B. Clemmensen ◽  
...  
Keyword(s):  
Sea Level ◽  
Ground Penetrating Radar ◽  
Beach Ridge ◽  
Ground Penetrating

scholarly journals Beach-ridge architecture constrained by beach topography and ground-penetrating radar, Itilleq (Laksebugt), south-west Disko, Greenland – implications for sea-level reconstructions.

2018 ◽  
Vol 66 ◽  
pp. 167-179
Author(s):  
Priscila E. Souza ◽  
Aart Kroon ◽  
Lars Nielsen
Keyword(s):  
Ground Penetrating Radar ◽  
Abrupt Change ◽  
Beach Ridge ◽  
Sediment Grain Size ◽  
Beach Ridges ◽  
Reflection Data ◽  
South West ◽  
Tide Level ◽  
Ground Penetrating ◽  
Reflection Characteristics

Detailed topographic data and high-resolution ground-penetrating radar (GPR) reflection data are presented from the present-day beach and across successive raised beach ridges at Itilleq, south-west Disko, West Greenland. In the western part of the study area, the present low-tide level is well defined by an abrupt change in sediment grain size between the sandy foreshore and the upper shoreface that is characterised by frequently occurring large clasts. The main parts of both fine and large clasts appear to be locally derived. Seaward-dipping reflections form downlap points, which are clearly identified in all beach-ridge GPR profiles. Most of them are located at the boundary between a unit with reflection characteristics representing palaeo-foreshore deposits and a deeper and more complex radar unit characterised by diffractions; the deeper unit is not penetrated to large depths by the GPR signals. Based on observations of the active shoreface regime, large clasts are interpreted to give rise to scattering observed near the top of the deeper radar unit. We regard the downlap points located at this radar boundary as markers of palaeo-low-tide levels. In some places, scattering hyperbolas are more pronounced and frequent than in others, suggesting differences in the occurrence of large boulders.

scholarly journals Ground Penetrating Radar Investigation of Late Pleistocene Shorelines of Pluvial Lake Clover, Elko County, Nevada, USA

Quaternary ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 9
Author(s):  
Jeffrey S. Munroe
Keyword(s):  
Late Pleistocene ◽  
Ground Penetrating Radar ◽  
Land Surface ◽  
Primary Objective ◽  
Water Levels ◽  
Beach Ridge ◽  
Beach Ridges ◽  
Sand And Gravel ◽  
Ground Penetrating ◽  
Topographic Surveys

Beach ridges constructed by pluvial Lake Clover in Elko County, Nevada during the Late Pleistocene were investigated with ground-penetrating radar (GPR). The primary objective was to document the internal architecture of these shorelines and to evaluate whether they were constructed during lake rise or fall. GPR data were collected with a ground-coupled 400-Mhz antenna and SIR-3000 controller. To constrain the morphology of the ridges, detailed topographic surveys were collected with a Topcon GTS-235W total station referenced to a second class 0 vertical survey point. GPR transects crossed the beach ridge built by Lake Clover at its highstand of 1725 m, along with seven other ridges down to the lowest beach at 1712 m. An average dielectric permittivity of 5.0, typical for dry sand and gravel, was calculated from GPR surveys in the vicinity of hand-excavations that encountered prominent stratigraphic discontinuities at known depths. Assuming this value, consistent radar signals were returned to a depth of ~3 m. Beach ridges are resolvable as ~90 to 150-cm thick stratified packages of gravelly sand overlying a prominent lakeward-dipping reflector, interpreted as the pre-lake land surface. Many ridges contain a package of sediment resembling a buried berm at their core, typically offset in a landward direction from the geomorphic crest of the beach ridge. Sequences of lakeward-dipping reflectors are resolvable beneath the beach face of all ridges. No evidence was observed to indicate that beach ridges were submerged by higher water levels after their formation. Instead, the GPR data are consistent with a model of sequential ridge formation during a monotonic lake regression.

Ground-penetrating radar study of beach-ridge deposits in Huangqihai Lake, North China: the imprint of washover processes

2015 ◽  
Vol 10 (1) ◽  
pp. 183-194 ◽  
Author(s):  
Xin Shan ◽  
Xinghe Yu ◽  
Peter D. Clift ◽  
Chengpeng Tan ◽  
Shunli Li ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
North China ◽  
Beach Ridge ◽  
Huangqihai Lake ◽  
Ground Penetrating

Internal structure of mixed-sand-and-gravel beach deposits revealed using ground-penetrating radar

Sedimentology ◽  
2002 ◽  
Vol 49 (4) ◽  
pp. 789-804 ◽  
Author(s):  
Adrian Neal ◽  
Nigel I Pontee ◽  
Ken Pye ◽  
Julie Richards
Keyword(s):  
Internal Structure ◽  
Ground Penetrating Radar ◽  
Sand And Gravel ◽  
Ground Penetrating ◽  
Gravel Beach

REFLECTION COEFFICIENT OF AN ELECTROMAGNETIC WAVE IN CONDUCTIVE MEDIA

2018 ◽  
pp. 100-106
Author(s):  
M. S. Sudakova ◽  
M. L. Vladov ◽  
M. R. Sadurtdinov
Keyword(s):  
Reflection Coefficient ◽  
Ground Penetrating Radar ◽  
Electromagnetic Waves ◽  
Water Contamination ◽  
Survey Design ◽  
Direct And Inverse Problems ◽  
The Difference ◽  
Ground Penetrating ◽  
Ideal Dielectric

Within the ground penetrating radar bandwidth the medium is considered to be an ideal dielectric, which is not always true. Electromagnetic waves reflection coefficient conductivity dependence showed a significant role of the difference in conductivity in reflection strength. It was confirmed by physical modeling. Conductivity of geological media should be taken into account when solving direct and inverse problems, survey design planning, etc. Ground penetrating radar can be used to solve the problem of mapping of halocline or determine water contamination.

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