scholarly journals Supplemental Material: Further evidence for the Matanuska megaflood hypothesis, Alaska

2021 ◽  
Author(s):  
R. Michael Wiedmer ◽  
et al.
Keyword(s):  
Ground Penetrating Radar ◽  
Contour Map ◽  
Ground Penetrating

Color elevation contour map of the area surrounding the junction of the Matanuska and Knik lobes of the Elmendorf moraine, as well as ground-penetrating radar profiles

scholarly journals Using ground penetrating radar to understand the failure of the Koh Ker Reservoir, Northern Cambodia.

2021 ◽  
Author(s):  
Ian Moffat ◽  
sarah klassen ◽  
Tiago Attorre ◽  
Damian Evans ◽  
Terry Lustig ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Ground Penetrating Radar ◽  
Rainy Season ◽  
The Political ◽  
Contour Map ◽  
Design Flaw ◽  
Political Center ◽  
Ground Penetrating

Ground penetrating radar, probing, and excavation were used to create a contour map of the topography of a buried laterite pavement forming the spillway of a large abandoned reservoir at the Angkorian‐period city of Koh Ker in Cambodia. Calculations of the flow velocity of water through the spillway, based on the topography of the laterite surface, demonstrate that this outlet was even less adequate for passing the flow of water from the Stung Rongea catchment than had been estimated previously by Lustig, Klassen, Evans, French, & Moffat (2018). We argue that this design flaw contributed substantially to the failure of the reservoir’s dike, possibly during the first rainy season after construction, which may have contributed to Koh Ker’s remarkably short‐lived tenure as the political center of the Khmer Empire.

scholarly journals Supplemental Material: Further evidence for the Matanuska megaflood hypothesis, Alaska

2021 ◽  
Author(s):  
R. Michael Wiedmer ◽  
et al.
Keyword(s):  
Ground Penetrating Radar ◽  
Contour Map ◽  
Ground Penetrating

Color elevation contour map of the area surrounding the junction of the Matanuska and Knik lobes of the Elmendorf moraine, as well as ground-penetrating radar profiles

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.

Deteksi Bentuk Objek Bawah Tanah Menggunakan Pengolahan Citra B-Scan pada Ground Penetrating Radar (GPR)

2017 ◽  
Vol 3 (1) ◽  
pp. 73-83
Author(s):  
Rahmayati Alindra ◽  
Heroe Wijanto ◽  
Koredianto Usman
Keyword(s):  
Signal Processing ◽  
Ground Penetrating Radar ◽  
Post Processing ◽  
Data Survey ◽  
Ground Penetrating

Ground Penetrating Radar (GPR) adalah salah satu jenis radar yang digunakan untuk menyelidiki kondisi di bawah permukaan tanah tanpa harus menggali dan merusak tanah. Sistem GPR terdiri atas pengirim (transmitter), yaitu antena yang terhubung ke generator sinyal dan bagian penerima (receiver), yaitu antena yang terhubung ke LNA dan ADC yang kemudian terhubung ke unit pengolahan data hasil survey serta display sebagai tampilan output-nya dan post  processing untuk alat bantu mendapatkan informasi mengenai suatu objek. GPR bekerja dengan cara memancarkan gelombang elektromagnetik ke dalam tanah dan menerima sinyal yang dipantulkan oleh objek-objek di bawah permukaan tanah. Sinyal yang diterima kemudian diolah pada bagian signal processing dengan tujuan untuk menghasilkan gambaran kondisi di bawah permukaan tanah yang dapat dengan mudah dibaca dan diinterpretasikan oleh user. Signal processing sendiri terdiri dari beberapa tahap yaitu A-Scan yang meliputi perbaikan sinyal dan pendektesian objek satu dimensi, B-Scan untuk pemrosesan data dua dimensi  dan C-Scan untuk pemrosesan data tiga dimensi. Metode yang digunakan pada pemrosesan B-Scan salah satunya adalah dengan  teknik pemrosesan citra. Dengan pemrosesan citra, data survey B-scan diolah untuk didapatkan informasi mengenai objek. Pada penelitian ini, diterapkan teori gradien garis pada pemrosesan citra B-scan untuk menentukan bentuk dua dimensi dari objek bawah tanah yaitu persegi, segitiga atau lingkaran. 

Reconstructing Properties of Subsurface from Ground-Penetrating Radar Data

PIERS Online ◽  
2006 ◽  
Vol 2 (6) ◽  
pp. 567-572
Author(s):  
Hui Zhou ◽  
Dongling Qiu ◽  
Takashi Takenaka
Keyword(s):  
Ground Penetrating Radar ◽  
Radar Data ◽  
Ground Penetrating

Localized Parametric Electromagnetic Inversion for Pavement Profiling with Ground Penetrating Radar

PIERS Online ◽  
2005 ◽  
Vol 1 (3) ◽  
pp. 341-344 ◽  
Author(s):  
Weikun He ◽  
Jiaxue Liu ◽  
Renbiao Wu
Keyword(s):  
Ground Penetrating Radar ◽  
Ground Penetrating
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