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Use of vertical radar profiling to estimate porosity at two

  • Estimating porosity with ground-penetrating radar

    The experimental data set consisted of 3-D multioffset radar acquired on an orthogonal 20 30 m surface grid that encompassed a set of 13 boreholes. Experimental control included (1) 1-D vertical velocity functions determined from traveltime inversion of vertical radar profiles (VRP) and (2) neutron porosity

  • High-resolution water content estimation from surface

    multioffset GPR data have a meter-scale lateral and vertical resolution when compared with spatially averaged neutron porosity logs. This resolution capability, which is larger than the dominant GPR wavelength, is comparable to the resolu-tion of cross-hole and vertical radar profiling (VRP) tra-veltime tomography using 100 MHz [e.g., Tronicke

  • Estimation of bulk permittivity of the Moons surface

    Sep 22, 2020· Assuming incident EM waves from LRS being normal to the horizontally stratified two-layer models, bulk permittivity, porosity and loss tangent near the lunar surface were estimated using the observed LRS data by calculating EM wave propagation according to the radar range equation. Combined use of the estimated FeO + TiO 2 content distribution

  • Measuring vertical soil water content profiles by

    many. Zero-offset ground penetrating radar profiling in horizontal boreholes was used to obtain soil water content information at specific depths (0.2, 0.4, 0.6, 0.8 and 1.2 m). However, horizontal borehole ground penetrating radar measurements do not provide accurate soil water content estimates of the top soil (00.1 m depth)

  • Estimation of dielectric permittivity, water content, and

    Apr 05, 2016· Lane J W Jr, and OGW-BG U (2002), Use of vertical-radar profiling to estimate porosity at two New England sites and comparison with neutron log porosity. Lane J Jr, Buursink ML, Haeni F, Versteeg R (2000) Evaluation of groundpenetrating radar to detect freephase hydrocarbons in fractured rocksresults of numerical modeling and physical

  • (PDF) High-resolution seismic and ground penetrating radar

    However, in most terrains the vertical resolution is found to be two or three times the theoretical vertical resolution, depending upon surface roughness and slope, volume scattering, pulse bandwidth, dispersivity, properties contrast, etc.The ability to compare physical event identification using the two systems, Chirp and GPR, is caused by

  • Seismic profiling - PetroWiki

    Jun 03, 2015· Vertical seismic profiling. In VSP, a seismic sensor is lowered to a sequence of selected depths in a well by wireline. Fig. 1 shows the source-receiver geometry involved in VSP. A wall-locked seismic sensor is manipulated downhole by wireline so that the receiver occupies a succession of closely spaced vertical stations.

  • Cross well radar and vertical radar profiling methods for

    The interpretation of vertical radar profiles was more challenging. However both techniques successfully reveal the time-lapse response of water migrating through the unsaturated soil profile for the two trial sites. Key words: Vertical Radar Profiling, Zero vertical offset crosswell Profiling, water infiltration

  • Instantaneous vertical profiling of precipitation using

    Nov 13, 2010· To that end, we conducted several studies to 1) establish that the main impediment to the vertical profiling is the unknown signature of the sea surface in the non-precipitating portions of the field of view, and 2) use surfaceinsensitive principal components of the brightness temperatures to retrieve the vertical principal components of the

  • On the Estimation of InCloud Vertical Air Motion Using

    radar to estimate in-cloud vertical motion. In particular, RWPs operating in the VHF (50 and 400 MHz) bands can directly provide vertical air motion estimates using Bragg scattering from clear-air refractive index irregularities (Rajopadhyaya et al., 1998). However, RWPs

  • Doppler Radar - an overview ScienceDirect Topics

    Dec 12, 1989· Because clear-air signal power is often less than receiver noise power, profilers use relatively long dwell times to estimate the wind. For example, the NOAA experimental profiling radar (Table 11.1) has a one-minute dwell time to estimate velocities along each beam for both high and low modes of data collection (Fig. 11.26).

  • Combined Use of Geoelectric Sounding and Profiling to

    Combined Use of Geoelectric Sounding and Profiling to Quantify Aquifer Protection Properties Robert J. Kalinski Department of Civil Engineering, University of NebraskaLincoln, Lincoln, Nebraska 68588 (Kalinski is currently at WoodwardClyde Federal Services, 101 South 108th Avenue, Omaha, Nebraska 68154).

  • Improved Hydrogeophysical Parameter Estimation from

    as volumetric water content, porosity, and hydraulic conductivity. The results are validated using a coincident vertical radar profile, existing hydraulic data from direct measurements, and comparing EMD derived parameters with those non-EMD derived. The results of the comparison between the EMD and non-EMD methods show improved hydrogeophysical

  • Ground-Penetrating Radar Velocity Determination and

    Ground-penetrating radar velocity determinationand precision estimates using common-mid-point (CMP) collection with hand-picking, semblance analysis, and cross-correlation analysis: A case study and tutorial for archaeologists . R. W. Jacob¹* and T. M. Urban² . 1. Bucknell University 2. Cornell University, formerly Oxford University

  • The Use of Millimeter Doppler Radar Echoes to Estimate

    means of profiling airborne radar data collected in the central Great Plains during the International H 2 O Project, MayJune 2002 (IHOP 2002). Clear-air echoes are sufficiently strong for the radar, a 95-GHz cloud radar, to detect most of the CBL at a resolution of 30 m. Vertical radar

  • Boise Hydrogeo-physical Research Site (BHRS) - Boise

    Knoll, M.D., and W.P. Clement, 1999, Vertical radar profiling to determine dielectric constant, water content and porosity values at well locations: Proceedings of SAGEEP99, The Symposium on the Application of Geophysics to Engineering and Environmental Problems,

  • Detecting sand-dust storms using a wind-profiling radar

    Sand-dust storm is a type of disastrous weather, typically occurring in arid and semi-arid climates. This study selected a region in the hinterlands of the Taklimakan Desert, called the Tazhong region, as the experimental area to quantitatively estimate the particle concentrations of sand-dust storms using the boundary layer wind-profiling radar.

  • Integrated Borehole, Radar, and Seismic Velocity Analysis

    Seismic refraction profiling has been used to obtain the compressional (P) wave velocity (Vp) structure of the firn and ice to improve the estimate of the aquiferice transition depth (e.g., Montgomery et al., 2017). However, thus far, there is no constraint of the shear (S) wave velocity (Vs) distribution in

  • USE OF VERTICAL-RADAR PROFILING TO ESTIMATE POROSITY

    USE OF VERTICAL-RADAR PROFILING TO ESTIMATE POROSITY AT TWO NEW ENGLAND SITES AND COMPARISON WITH NEUTRON LOG POROSITY Marc L. Buursink, CGISS, Boise State University, Boise, ID John W. Lane Jr., OGW-BG, U.S. Geological Survey, Storrs, CT William P. Clement, CGISS, Boise State University, Boise, ID

  • Use of Borehole Radar Methods and Borehole Geophysical

    hole level-run radar, (2) cross-hole radar tomography, and (3) vertical radar profiling (VRP). In all three geometries, electromagnetic (EM) waves propagate from a transmitter antenna, and waveform traces are recorded at a receiver antenna. Measurements of arrival time are used to estimate EM-wave velocity, and measurements of amplitude are used to

  • A New Approximation of Water Saturation Estimation Based

    Jan 20, 2016· such as [2]: 2 k p m 2f V 2 1 f (5) V 2 0 Thus, if the attenuation Q-1 is plotted to the frequency, it can be obtained the slope of straight line (called slop) in the curve such as 2 k p m 2f V 2

  • Radar Wind Profiler Earth Observing Laboratory

    The Atmospheric Profiling Group in ISF operates boundary layer wind profilers as part of the Integrated Sounding System (ISS) (Parsons et al 1994). They can be deployed at fixed land sites, or as part of MISS (Mobile ISS) for rapid deployment, or at sea on research ships.They are vertically pointing UHF radars designed to detect back-scatter from clear-air turbulence and precipitation, using

  • July in of to - Wiley Online Library

    Eros now permit such a check, and also support porosity estimation for S-class objects. We use radar albedos and polarization ratios estimated for 36 main-belt asteroids and nine near- Earth asteroids to estimate near-surface solid densities using two methods, one of which is similar to

  • Observing Systems at the NOAA Environmental Technology

    The S-band has been calibrated through a side-by-side comparison with the Ka-band radar. In a typical cloud profiling mode of operation, the sensitivity is -14 dBZ at 10 km. Examples taken from a recent field campaign illustrate the profiler's ability to measure vertical velocity and radar reflectivity profiles in clouds and precipitation.

  • Water content and porosity estimated from ground

    Feb 01, 2006· The objective of this paper is to compare and evaluate the variations in water content (porosity in the saturated zone) in sand estimated independently by two standard geophysical techniques, ground-penetrating radar and resistivity, in combination with the relationship of Topp et al. (1980) and Archie's saturation equation .

  • Vertical profiling of tropical precipitation using passive

    the radarderived vertical radar precipitation rate profiles, on one hand, and try to estimate the main modes of this vari-ability from the simultaneously measured brightness tem-peratures. In our implementation, over a given region and a given season (defined so the precipitation events can be

  • Complex dielectric permittivity measurements from

    2.3. GPR Parameter Estimation 2.3.1. Velocity Analysis [9] Using equations (1)(5), quantitative estimates of radar attenuation and velocity provide a measure of the density, liquid water content, and SWE of snow. There are a variety of established methods we can use to measure radar velocity including moveout analysis of reflectors in com-

  • Intercomparison of snowfall estimates derived from the

    Accurate snowfall estimates are important for both weather and climate applications. Ground-based weather radars and space-based satellite sensors are often used as viable alternatives to rain gauges to estimate precipitation in this context. In particular, the Cloud Profiling Radar (CPR) on board CloudSat is proving to be a useful tool to map snowfall globally, in part due to its high

  • Comparison of soil water content estimation equations

    Sep 01, 2020· To use this equations, knowledge of porosity (which can be obtained from measurement of bulk density) and dielectric permittivity of the solid phase is needed. Porosity is obtained from measured bulk density by: (13) ϕ f = 1-ρ b ρ s where the density of the solid phase (ρ s) was assumed to be equal to 2.65 g c m-3.

  • Enhanced GPR data interpretation to estimate in situ water

    Feb 01, 2021· φ = porosity of solid materials. 3.2. Statistical analysis using the T-test. The hypothesis of this study was that CRIM could provide estimated water content results that are closer to the reference data than those from the Topps equation. This accuracy was evaluated using the

  • [PDF] Modeling Dielectric-constant values of Geologic

    Ground-penetrating radar (GPR) is a near-surface geophysical imaging technique used for nonintrusive subsurface geologic and engineering investigations. Dielectric constant is a critical parameter for GPR surveys because it controls propagation velocity of electromagnetic waves through material, reflection coefficients across interfaces of different materials, and vertical and horizontal

  • Vertical radar profiling: influence of survey geometry on

    Apr 01, 2005· Use of vertical-radar profiling to estimate porosity at two New England sites and comparison to neutron log porosity Proceedings, Symposium on the Application of Geophysics to Engineering and Environmental Problems, 1014 February 2002, Las Vegas, Nevada , Engineering and Environmental Geophysical Society ( 2002 )

  • Measuring vertical soil water content profiles by

    Mar 13, 2020· Zerooffset ground penetrating radar profiling in horizontal boreholes was used to obtain soil water content information at specific depths (0.2, 0.4, 0.6, 0.8 and 1.2 m). However, horizontal borehole ground penetrating radar measurements do not provide accurate soil water content estimates of the top soil (00.1 m depth) because of

  • Characterization of the porosity distribution in the upper

    The karst Biscayne aquifer is characterized by a heterogeneous spatial arrangement of porosity and hydraulic conductivity, making conceptualization difficult. The Biscayne aquifer is the primary source of drinking water for millions of people in south Florida; thus, information concerning the distribution of karst features that concentrate the groundwater flow and affect contaminant transport

  • Vertical Radar Profiling to Determine Dielectric Constant

    VERTICAL RADAR PROFILING TO DETERMINE DIELECTRIC CONSTANT, WATER CONTENT AND POROSITY VALUES AT WELL LOCATIONS Michael D. Knoll and William P. Clement Center for Geophysical Investigation of the Shallow Subsurface Boise State University Boise, ID 83725 ABSTRACT

  • TC - The vertical structure of precipitation at two

    The vertical profiles of snow types have been identified with the dual-polarization weather radar observations collected at DDU by Grazioli et al. (2017 a), who found that more pristine particles (e.g., dendrites, columns) are largely dominant above 2.5 km in height and that the proportion of aggregates and rimed particles significantly

  • Estimating Raindrop Size Distributions and Vertical

    Estimate profiles of vertical air motion and raindrop size distributions (DSDs) using two non-synchronous and non-beam matched vertically pointing profilers Approach Exploit the different backscattering signatures at Ka-band (KAZR) and S-band KAZR non-Rayleigh (also, non-Bragg) S-band Rayleigh Key Results

  • Permeability and porosity images based on <emph type

    [2] Surface and borehole geophysical techniques have been used to delineate aquifers and estimate the fluid and rock physical properties of the subsurface. In particular, surface methods such as seismic, resistivity, electromagnetic (EM), and ground-penetrating radar (GPR) have been widely used. Sandersen and Jorgensen [2003] characterized

  • Chapter 2: Characterization of in situ elastic properties

    sediments, and the relationship is commonly used to estimate porosity in clay-rich formations with poor borehole conditions [Collett, 1998, Jarrard et al., 1989, Srivastava et al., 1987]. The resulting porosity log is shown in Figure 2.3d, where it compares well with the discrete porosity measured on core samples at

  • (PDF) Vertical Radar Profiling to Determine Dielectric

    PDF On Jan 1, 1999, Michael D. Knoll and others published Vertical Radar Profiling to Determine Dielectric Constant, Water Content and Porosity Values at Well Locations Find, read and cite all

  • Three-dimensional stochastic estimation of porosity

    This is done for two cases where the withheld porosity log is located: (1) at a crosshole GPR profile, so the full available data set, with the exception only of the with- held porosity log, is used to condition the 3-D simulation; and (2) where no data are available so all the existing cross- hole profiles intersecting the withheld porosity log are also withheld for this estimation process.

  • Reflectivity modeling of a ground-penetrating-radar profile

    porosity of 0.17-0.18 cobble-dominated units with no relatively sand-rich lenses. Cobble-size framework grains also dominate Units 2 and 4, but these units have higher porosity an average po-rosity of 0.23-0.24 , more variable porosity, and some sand-rich lenses. In addition, strong porosity

  • Use of vertical-radar profiling to estimate porosity at

    Final copy as submitted to Symposium on the Application of Geophysics to Engineering and Environmental Problems for publication as: Buursink, M.L., Lane, J.W., Jr., Clement, W.P., and Knoll, M.D., 2002, Use of vertical-radar profiling to estimate porosity at two New England sites and comparison with neutron log porosity, in Symposium on the Application of Geophysics to Engineering

  • (PDF) Use of VerticalRadar Profiling to Estimate Porosity

    Use of VerticalRadar Profiling to Estimate Porosity at Two New England Sites and Comparison with Neutron Log Porosity. M.D., 2002, Use of vertical-radar profiling to estimate porosity at


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