Development LVG GLS Geolectrical Instrument for Monitoring Near Surface Geohazard

This paper was presented in The 3rd Padjadjaran International Physics Symposium 2017, Holiday-Inn Hotel, Bandung , 14-15 November 2017, Department of Physics Universitas Padjadjaran. Authors: Prihadi Sumintadireja1, Ihsan Imaduddin2,4, Wahyu Srigutomo2, Enjang Jaenal Mustopa2, Diky Irawan3, Ihsanuddin A. Lubis3. Abstract: This paper demonstrated a new geolectrical equipment of LVG GLS multi channel , which as part of Laboratory of Application and Geosciences Modeling research, which funded by Institut Teknologi Bandung. Initially, the LVG GLS equipment is designed for delineating geothermal area by mise a la masse configuration. Furthermore, the application is plan to modify for geohazard study, since many landslide occurrence without clear explanation about the involving process due to lack data measurement. The ability of equipment is able to measure resistivity of subsurface condition in real time and continuous. Therefore, spatial and temporal data for monitoring vulnerable landslide area, which identified by geological mapping can be visualized to mitigate the geohazard area more precisely. The simultaneous 80 channel electrode measurement can reduced inhomogeneity of spontaneous potential value, which change by time interval.

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Route selection for natural gas pipelines in Ireland

Geological Society London Engineering Geology Special Publications ◽

10.1144/gsl.eng.1987.004.01.56 ◽

1987 ◽

Vol 4 (1) ◽

pp. 467-474

Author(s):

J. H. Redding

Keyword(s):

Natural Gas ◽

Rural Areas ◽

Site Investigation ◽

Geological Mapping ◽

Route Selection ◽

Construction Costs ◽

Near Surface ◽

Natural Gas Pipelines ◽

Potential Difficulty ◽

Ground Conditions

AbstractBy the end of 1986, over 400 km of high pressure (70 bar) natural gas pipeline will have been constructed in the Irish Republic, much of it laid in sparsely populated rural areas where topography, hydrology, near surface geology and ground conditions can significantly influence construction feasibility and cost. Identifying, quantifying and (where possible) avoiding areas of potential difficulty or hazard are aspects of route selection to which engineering geology can make an important contribution. This contribution is discussed in relation to the Cork-Dublin pipeline completed in 1982, and the Limerick, Waterford and Mallow lines due for completion this year. In particular, the application and merits of stereo aerial photographic interpretation, superficial geological mapping and field study are outlined, together with the use of more traditional methods of site investigation. Attention is focussed on indigenous engineering geological problems associated with shallow rock, limestone karst, peat bog and poorly drained alluvial and morainic soils. Data acquisition and presentation are discussed within the overall context of civil engineering contract preparation and administration. The usefulness of this approach, particularly for predicting and minimising construction costs, forestalling claims and generally facilitating on-site supervision, is emphasised.

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Dealing with Precise and Imprecise Temporal Data in Crisp Ontology

International Journal of Information Technology and Web Engineering ◽

10.4018/ijitwe.2020040102 ◽

2020 ◽

Vol 15 (2) ◽

pp. 30-49 ◽

Cited By ~ 1

Author(s):

Fatma Ghorbel ◽

Fayçal Hamdi ◽

Elisabeth Métais

Keyword(s):

Set Theory ◽

Temporal Reasoning ◽

Time Interval ◽

Temporal Data ◽

Time Intervals ◽

Time Points ◽

Interval Algebra ◽

Precise Time ◽

Time Point

This article proposes a crisp-based approach for representing and reasoning about concepts evolving in time and of their properties in terms of qualitative relations (e.g., “before”) in addition to quantitative ones, time intervals and points. It is not only suitable to handle precise time intervals and points, but also imprecise ones. It extends the 4D-fluents approach with crisp components to represent handed data. It also extends the Allen's interval algebra. This extension allows reasoning about imprecise time intervals. Compared to related work, it is based on crisp set theory. These relations preserve many properties of the original algebra. Their definitions are adapted to allow relating a time interval and a time point, and two time points. All relations can be used for temporal reasoning by means of transitivity tables. Finally, it proposes a crisp ontology that based on the extended Allen's algebra instantiates the 4D-fluents-based representation.

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K2: A Novel Data Analysis Framework to Understand US Emotions in Space and Time

International Journal of Semantic Computing ◽

10.1142/s1793351x19400063 ◽

2019 ◽

Vol 13 (01) ◽

pp. 111-133

Author(s):

Romita Banerjee ◽

Karima Elgarroussi ◽

Sujing Wang ◽

Akhil Talari ◽

Yongli Zhang ◽

...

Keyword(s):

Data Analysis ◽

Negative Emotion ◽

Time Interval ◽

Temporal Data ◽

Analysis Framework ◽

Spatial Clusters ◽

Change Analysis ◽

Spatio Temporal ◽

Temporal Data Analysis ◽

Very High

Twitter is one of the most popular social media platforms used by millions of users daily to post their opinions and emotions. Consequently, Twitter tweets have become a valuable knowledge source for emotion analysis. In this paper, we present a new framework, K2, for tweet emotion mapping and emotion change analysis. It introduces a novel, generic spatio-temporal data analysis and storytelling framework that can be used to understand the emotional evolution of a specific section of population. The input for our framework is the location and time of where and when the tweets were posted and an emotion assessment score in the range [Formula: see text], with [Formula: see text] representing a very high positive emotion and [Formula: see text] representing a very high negative emotion. Our framework first segments the input dataset into a number of batches with each batch representing a specific time interval. This time interval can be a week, a month or a day. By generalizing existing kernel density estimation techniques in the next step, we transform each batch into a continuous function that takes positive and negative values. We have used contouring algorithms to find the contiguous regions with highly positive and highly negative emotions belonging to each member of the batch. Finally, we apply a generic, change analysis framework that monitors how positive and negative emotion regions evolve over time. In particular, using this framework, unary and binary change predicate are defined and matched against the identified spatial clusters, and change relationships will then be recorded, for those spatial clusters for which a match occurs. We also propose animation techniques to facilitate spatio-temporal data storytelling based on the obtained spatio-temporal data analysis results. We demo our approach using tweets collected in the state of New York in the month of June 2014.

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Correlation between near-surface electromagnetic soil parameters and early-time GPR signals: An experimental study

Geophysics ◽

10.1190/1.2435171 ◽

2007 ◽

Vol 72 (2) ◽

pp. A25-A28 ◽

Cited By ~ 36

Author(s):

Elena Pettinelli ◽

Giuliano Vannaroni ◽

Barbara Di Pasquo ◽

Elisabetta Mattei ◽

Andrea Di Matteo ◽

...

Keyword(s):

Electrical Properties ◽

Early Time ◽

Test Site ◽

Time Domain Reflectometry ◽

Soil Parameters ◽

Time Interval ◽

Near Surface ◽

Novel Approach ◽

Natural Test ◽

Ground Penetrating

We explore a new approach to evaluate the effect of soil electromagnetic parameters on early-time ground-penetrating radar (GPR) signals. The analysis is performed in a time interval which contains the direct airwaves and ground waves, propagating between transmitting and receiving antennas. To perform the measurements we have selected a natural test site characterized by very strong lateral gradient of the soil electrical properties. To evaluate the effect of the subsoil permittivity and conductivity on the radar response we compare the envelope amplitude of the GPR signals received in the first [Formula: see text] within [Formula: see text]-wide windows, with the electrical properties ([Formula: see text] and [Formula: see text]) determined using time-domain reflectometry (TDR). The results show that the constitutive soil parameters strongly influence early-time signals, suggesting a novel approach for estimating the spatial variability of water content with GPR.

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Analysis of seismic efficiency of the electromagnetic pulse source "Yenisei"

10.5194/egusphere-egu2020-2754 ◽

2020 ◽

Author(s):

Oxana Sadovskaya ◽

Vladimir Sadovskii ◽

Evgenii Efimov

Keyword(s):

Granular Materials ◽

Electromagnetic Pulse ◽

Seismic Sources ◽

Time Interval ◽

Pulse Source ◽

Surface Soils ◽

Low Frequencies ◽

Periodic Action ◽

Near Surface ◽

Seismic Efficiency

We developed a computational technology for numerical modeling of wave fields generated by seismic sources in blocky-layered geological media, and applied it to the analysis of efficiency of the electromagnetic pulse source of new generation "Yenisei", created recently by international geotechnical company "Geotech Seismic Services". To describe wave processes, we worked out new mathematical models of the dynamics of elastic, viscoelastic and elastic-plastic media, of porous and granular materials taking into account the increase in stiffness of such materials as pores collapse, [1]. Algorithms of numerical implementation of governing equations were realized for the cluster-type supercomputers, based on the method of two-cyclic splitting with respect to spatial variables. The conducted computational experiments have demonstrated that the proposed technology allows reproducing the system of waves near the region of excitation of seismic oscillations in 3D setting with a high degree of details and accuracy, [2]. We analysed frequencies and amplitudes of waves generated in the near-surface soils, and showed that our computational results are in a good agreement with seismic parameters of a real electromagnetic pulse source. We studied seismic efficiency of the pulse source as the ratio of the energy passing through the reflecting surface in the depth of layered massif to the energy of pulse effect on the surface. Besides, the energy of surface waves, which is obviously useless for the excitation of reflected waves, was estimated. To compare the energy efficiency of pulse sources with seismic sources of periodic action (vibrators), the problem of cyclic loading through the platform was solved numerically by the same method and the same geometric scheme. The seismic efficiency of vibrator was calculated by the maximum value of the energy fluxes during large time interval. Judging by computations, the pulse seismic sources are not inferior to the sources of vibratory type by seismic efficiency in the range of low frequencies. However, it is necessary to take into account that they differ sharply by the level of expended energy, because the energy of a pulse source, needed for generation of incident wave of a given amplitude, is many times lower than the energy of a vibrator.The reported study was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project No. 18-41-242001: "Analysis of wavy seismic fields generated by the electromagnetic pulse source "Yenisei" in heterogeneous soil massifs during geological exploration in the conditions of northern regions of Eastern Siberia".References<ol><li>Sadovskaya O., Sadovskii V. Mathematical Modeling in Mechanics of Granular Materials. Ser.: Advanced Structured Materials, vol. 21. Springer, Heidelberg &#8211; New York &#8211; Dordrecht &#8211; London, 2012. 390 p.</li> <li>Sadovskii V.M., Sadovskaya O.V., Efimov E.A. Analysis of seismic waves exited in near-surface soils by means of the electromagnetic pulse source "Yenisei". Materials Physics and Mechanics. 2019. V. 42, No. 5. P. 544&#8211;557.</li> </ol>

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Near surface geological mapping with Rayleigh wave imaging in Inner Mongolia, China

10.1190/segj2018-099.1 ◽

2019 ◽

Author(s):

Qingchun Li ◽

Guangzhou Shao ◽

Xinxin Li ◽

Jun Liu ◽

Qin Li ◽

...

Keyword(s):

Rayleigh Wave ◽

Inner Mongolia ◽

Geological Mapping ◽

Near Surface ◽

Wave Imaging

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A survey of current trends in near-surface electrical and electromagnetic methods

Geophysics ◽

10.1190/1.2335575 ◽

2006 ◽

Vol 71 (5) ◽

pp. G249-G260 ◽

Cited By ~ 99

Author(s):

Esben Auken ◽

Louise Pellerin ◽

Niels B. Christensen ◽

Kurt Sørensen

Keyword(s):

Precision Agriculture ◽

Cost Effective ◽

Geological Mapping ◽

Easy Access ◽

Data Sets ◽

Near Surface ◽

Shallow Subsurface ◽

Effective Manner ◽

Geotechnical Investigations ◽

New Interpretation

Electrical and electromagnetic (E&EM) methods for near-surface investigations have undergone rapid improvements over the past few decades. Besides the traditional applications in groundwater investigations, natural-resource exploration, and geological mapping, a number of new applications have appeared. These include hazardous-waste characterization studies, precision-agriculture applications, archeological surveys, and geotechnical investigations. The inclu-sion of microprocessors in survey instruments, development of new interpretation algorithms, and easy access to powerful computers have supported innovation throughout the geophysical community and the E&EM community is no exception. Most notable are development of continuous-measurement systems that generate large, dense data sets efficiently. These have contributed significantly to the usefulness of E&EM methods by allowing measurements over wide areas without sacrificing lateral resolution. The availability of these luxuriant data sets in turn spurred development of interpretation algorithms, including: Laterally constrained 1D inversion as well as innovative 2D- and 3D-inversion methods. Taken together, these developments can be expected to improve the resolution and usefulness of E&EM methods and permit them to be applied economically. The trend is clearly toward dense surveying over larger areas, followed by highly automated, post-acquisition processing and interpretation to provide improved resolution of the shallow subsurface in a cost-effective manner.

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Rule-of-Thumb Formulas for Extending the Versatility of Tidal Current Tables

Marine Technology Society Journal ◽

10.4031/mtsj.34.2.2 ◽

2000 ◽

Vol 34 (2) ◽

pp. 18-21

Author(s):

Ben J. Korgen

Keyword(s):

Tidal Current ◽

Critical Value ◽

Tidal Currents ◽

Current Speed ◽

Time Interval ◽

Local Conditions ◽

Near Surface ◽

Rule Of Thumb ◽

Safety Margins ◽

Scientific Results

Four rule-of-thumb formulas have been derived for use in conjunction with existing tidal current tables. For near-surface tidal currents, these formulas yield 1) the percent of time current speed is above a critical value, 2) the percent of time current speed is below a critical value, 3) the time interval when current speed is above a critical value, and 4) the time interval when current speed is below a critical value. The formulas presented require as inputs the near-surface tidal current speed predictions found in standard tidal current tables. Intended for making rough approximations, these formulas may be useful in planning operations for which information on near-surface tidal currents is important. They are not scientific results or predictive models on which anyone’s life should depend. They should be used only with generous safety margins and if possible, with in situ current measurements, since local conditions may vary considerably.

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Assessment of Morphology Changes of the End Moraine of the Werenskiold Glacier (SW Spitsbergen) Using Active and Passive Remote Sensing Techniques

Remote Sensing ◽

10.3390/rs13112134 ◽

2021 ◽

Vol 13 (11) ◽

pp. 2134

Author(s):

Tadeusz Głowacki ◽

Damian Kasza

Keyword(s):

Morphological Changes ◽

Time Interval ◽

Dynamic Surface ◽

Near Surface ◽

Passive Remote Sensing ◽

Synthetic Aperture Radar Interferometry ◽

Aerial Photogrammetry ◽

Remote Sensing Techniques ◽

One Year

Wedel Jarlsberg Land in Svalbard is a region with a varied periglacial landscape. In the mountains and in the valleys, the climate is polar with permafrost. During the summer, the near-surface ground layer thaws. The Werenskiold Glacier, together with its end moraine, are located in the central part of this area. The rate of morphological changes observed within the moraine varies in time and space, and depends on the environmental conditions. This study investigates four periods of archival aerial photogrammetry measurements (1936, 1960, 1990, and 2011) performed for the end moraine of the glacier. The long-term analysis was also based on a direct GNSS RTK survey from 2015. Over a period of almost 80 years, more than 14 million m3 of rock and ice material disappeared from the end moraine of the glacier (an average of approximately 200 thousand m3/year). Analyses of the dynamic surface changes over one year (2015) were performed with the use of synthetic aperture radar interferometry (InSAR). The time interval between images was in this case 12 days and covered (simultaneously in each scene) the entire investigated area. In this case, the analysis demonstrated that over a period of only 4 months, the moraine lost 200 thousand m3 of material (approximately two thousand m3/day), which is equivalent to the entire annual mass loss of the moraine.

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