NSG2021 27th European Meeting of Environmental and Engineering Geophysics最新文献_第5页

EASYMAG: A Versatile Solution for High-Quality UAV Magnetic Acquisitions EASYMAG:高质量无人机磁采集的通用解决方案

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120105

J. Mercier de Lepinay, Tristan Freville, Bruno Gavazzi, Baptiste Kiemes, Luis Miguel Sanabria, H. Reiller

{"title":"EASYMAG: A Versatile Solution for High-Quality UAV Magnetic Acquisitions","authors":"J. Mercier de Lepinay, Tristan Freville, Bruno Gavazzi, Baptiste Kiemes, Luis Miguel Sanabria, H. Reiller","doi":"10.3997/2214-4609.202120105","DOIUrl":"https://doi.org/10.3997/2214-4609.202120105","url":null,"abstract":"Summary Terremys has sought to develop EASYMAG, an unmanned aerial system fully dedicated to magnetic surveying in a variety of contexts ranging from small and shallow objects or pipelines detection to large-scale geological mapping. Four major requirements are identified if one wishes to efficiently acquire quality magnetic data at such variable scales: 1- the sensitivity of the magnetic acquisition must be greater than the lowest expected signal according to the application (usually a few nT or lower); 2- The navigation and positioning must be precise enough to compete with ground operators with centimetric accuracy; 3- the flight flexibility must allow contrasting flight domains with topographic draping at any height; 4- the efficiency on the field must compete with existing vectors. Each of these aspects are investigated to demonstrate Terremys’ ability to perform quality magnetic surveys. A case study of drone magnetic acquisition for archaeological purposes is presented in comparison with a ground survey acquired in the same area. Ground and UAV surveys are of comparable quality and they can lead similar interpretations.","PeriodicalId":120362,"journal":{"name":"NSG2021 27th European Meeting of Environmental and Engineering Geophysics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128254996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transient Analysis of GPR Dipole Antenna Using Time Domain Energy Measures GPR偶极子天线瞬态时域能量分析

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120011

D. Poljak, S. Antonijevic, V. Doric, E. Miler, E. Khalil

{"title":"Transient Analysis of GPR Dipole Antenna Using Time Domain Energy Measures","authors":"D. Poljak, S. Antonijevic, V. Doric, E. Miler, E. Khalil","doi":"10.3997/2214-4609.202120011","DOIUrl":"https://doi.org/10.3997/2214-4609.202120011","url":null,"abstract":"Summary The paper deals with a direct time domain modelling of impulsively driven GPR dipole antenna above a homogeneous lossy half-space aiming to estimate the energy stored in the near field. The space-time dependent current is obtained by numerically solving the space-time Hallen integral equation and Pocklington equation via different approaches. The obtained results are compared to the results obtained via NEC and Inverse Fast Fourier Transform (IFFT). Provided the current is known one may calculate the charge distribution along the wire by using the one-dimensional version of the continuity equation. Knowing the space-time distribution of current and charge along the dipole antenna, time domain (TD) energy measures involving spatial integrals of squared values of transient current and charge, pertaining to the energy stored in the electric and magnetic field, respectively, of dipole antenna, are evaluated. Furthermore, total power measure defined as time derivative of the total energy measure is computed. Some illustrative computational examples for transient current, TD energy and power measures are given in the paper.","PeriodicalId":120362,"journal":{"name":"NSG2021 27th European Meeting of Environmental and Engineering Geophysics","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132336092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Fiber Optic Sensing for Landslides Early Signs Monitoring and Consequences Assessment 光纤传感在滑坡早期征兆监测与后果评估中的应用

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120026

F. Ravet, A. Goy, E. Rochat

引用次数: 0

Location accuracy of seabed nodes during 3D seismic survey for seep studying at Laptev sea. 在拉普捷夫海进行三维地震勘测以研究渗漏时海底节点的定位精度。

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120245

D. Ilinskiy

{"title":"Location accuracy of seabed nodes during 3D seismic survey for seep studying at Laptev sea.","authors":"D. Ilinskiy","doi":"10.3997/2214-4609.202120245","DOIUrl":"https://doi.org/10.3997/2214-4609.202120245","url":null,"abstract":"Summary Recent years marine surveys have provided a large and important data for mapping gaseous emissions from the seabed (the so-called seeps) of the North Seas of Russia. A number of researchers associate these phenomena with the release of methane from buried layers of permafrost on the shelf of the Arctic seas, which can potentially change the ratio of greenhouse gases in the Arctic and affect global climate change. The several important questions on the structure, composition and nature of these phenomena still remain unresolved. One of the ways to solve the questions posed is to perform detailed 3D seismic survey of high accuracy. During the 73th scientific voyage of R/V “Akademik Mstislav Keldysh” (AMK), 3-D reconnaissance seismic survey with seabed nodes was carried out. To study the internal structure of the sedimentary cover around the mega seep, we use a 3D reflection seismic method with seabed seismic nodes. The observation template consists of 16 4-component seismic seabed nodes with 300 meters spacing in both directions. Despite the absence of differential corrections for GPS/GLONASS, the obtained positioning accuracy of nodes on the sea bottom is sufficient for carrying out 3-D seismic survey.","PeriodicalId":120362,"journal":{"name":"NSG2021 27th European Meeting of Environmental and Engineering Geophysics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129385160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cross-Borehole ERT: Sensitivity, Model Resolution, and Field Data Quality 井间ERT:灵敏度、模型分辨率和现场数据质量

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120114

L. M. Madsen, A. Kühl, L. Levy, A. Christiansen

{"title":"Cross-Borehole ERT: Sensitivity, Model Resolution, and Field Data Quality","authors":"L. M. Madsen, A. Kühl, L. Levy, A. Christiansen","doi":"10.3997/2214-4609.202120114","DOIUrl":"https://doi.org/10.3997/2214-4609.202120114","url":null,"abstract":"Summary Sensitivity, resolution, and data quality are important parameters to consider when designing an ERT cross-borehole survey. We present an open-source algorithm for computing 2D and 3D sensitivity patterns of any borehole setup and use this to compare single-borehole and different cross-borehole electrode configurations, which both show complex patterns. To study the resolution capability of an entire survey, the model resolution matrix is computed for a field dataset. The dataset is split into different electrode configurations and the model resolution matrices of the different configuration are compared. The results show that the sensitivity and resolution decreases very quickly away from the electrodes, especially for the single-borehole configurations. In the studied field case, this means cross-borehole configurations are needed to correctly image the area between the boreholes, even though the cross-borehole data often are associated with a lower signal-to-noise ratio due to near-zero potential measurements and generally more outliers. The study concludes that in a production mode, where acquisition time and thus the number of possible data points are limited, the combination of electrode configurations must be carefully considered and a trade-off between resolution and data quality must be evaluated.","PeriodicalId":120362,"journal":{"name":"NSG2021 27th European Meeting of Environmental and Engineering Geophysics","volume":"53 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127572945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Typical Effects of the Registration Technology Implemented in the Gpr Receiver Gpr接收机中实现配准技术的典型效果

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 1900-01-01 DOI: 10.3997/2214-4609.202120153

O. Gulevich, L. Volkomirskaya, A. Reznikov, V. Varenkov

引用次数: 1

Using 1C nodes in a 3C combination - benefits, and inconveniences 在3C组合中使用1C节点-好处和不便

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 1900-01-01 DOI: 10.3997/2214-4609.202120139

A. Ourabah, L. Petronio, A. Affatato, L. Baradello, N. Goujon, Z. Song

引用次数: 0

Tomographic seismic imaging of a carbonate core at the laboratory scale 实验室规模碳酸盐岩心层析地震成像

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 1900-01-01 DOI: 10.3997/2214-4609.202120184

D. Brito, C. Shen, J. Díaz, C. Bordes, J. Virieux, S. Garambois

引用次数: 0

Three-Dimensional Time-Lapse Inversion of Tem Data With Application in an Icelandic Geothermal Site 瞬变电磁法三维时移反演及其在冰岛地热站点的应用

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 1900-01-01 DOI: 10.3997/2214-4609.202120206

L. Xiao, G. Fiandaca, P. Maurya, A. Christiansen, L. Levy

引用次数: 1

Mapping the Far Western Bushveld Complex Using Legacy 2D Seismic Reflection and Petrophysical Data 利用传统的二维地震反射和岩石物理数据绘制远西部Bushveld复合体

NSG2021 27th European Meeting of Environmental and Engineering Geophysics Pub Date : 1900-01-01 DOI: 10.3997/2214-4609.202120090

T. Nadan, M. Manzi, S. Scheiber-Enslin

引用次数: 0