Download or read book Monitoring Groundwater Levels Using a Time domain Reflectometry TDR Pulser written by Glenn A. Nicholson and published by . This book was released on 1997 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: A rugged, self-calibrating, time-domain reflectometer (TDR) device for monitoring groundwater elevations in piezometers was developed and demonstrated. The primary advantage of the TDR device over conventional downhole transducer technology is that the electronics are fixed at the surface where they are accessible and easy to maintain. The TDR instrumentation is also simple to install and does not require field calibration.
Download or read book Monitoring Groundwater Levels Using a Time domain Reflectometry TDR Pulser written by Glenn A. Nicholson and published by . This book was released on 1997 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A rugged, self-calibrating, time-domain reflectometer (TDR) device for monitoring groundwater elevations in piezometers was developed and demonstrated. The primary advantage of the TDR device over conventional downhole transducer technology is that the electronics are fixed at the surface where they are accessible and easy to maintain. The TDR instrumentation is also simple to install and does not require field calibration.
Download or read book Construction Productivity Advancement Research CPAR Program Monitoring Groundwater Levels Using a Time Domain Reflectometry TDR Pulser written by Glenn A. Nicholson and published by Washington DC : US Army Corps of Engineers, Waterways Experiment Station. This book was released on 1997 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book GeoMeasurements by Pulsing TDR Cables and Probes written by Kevin M O'Connor and published by CRC Press. This book was released on 2021-11-18 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: GeoMeasurements by Pulsing TDR Cables and Probes examines Time Domain Reflectometry (TDR) research and provides information on its use as a robust, reliable, and economical production tool. Common uses for TDR technology include telecommunications and power industries, but the text examines applications such as measurement of moisture of unsaturated soils; detection of fluids for leak and pollution; measurement of water levels for hydrological purposes; measurement of water pressures beneath dams; and deformation and stability monitoring of mines, slopes, and structures. Chapters discuss: basic physics of signal generation, transmission, and attenuation along the coaxial cable probe designs and procedures for calibration as well as the variation in probe responses to changes in water content and soil mineralogy variations in waveform characteristics associated with cable, deformation, cable calibration, and installation techniques for metallic cables in rock several cases demonstrating the use of TDR cables in soil as well as weathered and soft rock a rationale for the use of compliant cable in soil the use of metallic cable (MTDR) and optical fiber (OTDR) to monitor response of structures sensor/transducer components, connections from the sensors to the TDR pulser/sampler, and system control methods available software for transmission and analysis of TDR signatures The diverse interest and terminology within the TDR community tends to obscure commonalities and the universal physical principles underlying the technology. The authors seek to crystallize the basic principles among the seemingly divergent specialties using TDR technology in geomaterials. By examining varied experiences, GeoMeasurements by Pulsing TDR Cables and Probes provides a synergistic text necessary to unify the field.
Download or read book Using Time Domain Reflectometry TDR to Monitor Deep Ground water Elevations written by Neil O. Anderson and published by . This book was released on 2002 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tailings and Mine Waste 2000 written by A. A. Balkema Publishers and published by CRC Press. This book was released on 2022-05-16 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this text is to provide information on mill tailings and mine waste, and to discuss current and future issues facing the mining and environmental communities. With over 60 papers included.
Download or read book Structural Materials Technology written by Sreenivas Alampalli and published by CRC Press. This book was released on 2000-02-29 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth Structural Materials Technology NDT Conference was held in Atlantic City, New Jersey, with over sixty speakers presenting on a wide variety of topics. The goal of this conference was to inform engineers and researchers of the new nondestructive testing/nondestructive evaluation (NDT/NDE) technologies and techniques available for use in transportation construction. The use of alternative materials is challenging NDT/NDE professionals to develop new methods or modify existing techniques to address quality control, quality assurance, and long-term monitoring of structures built or strengthened with these materials. One such alternative is fiber-reinforced polymer (FRP) products. This conference included papers on this topic and a panel discussion that focused on the future of NDT/NDE technologies for structures built or rehabilitated with FRP composites. These proceedings contain the 62 papers that were presented at the conference, arranged according to session number. An author index is included.
Download or read book Energy and Water Development Appropriations for 1996 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1995 with total page 1272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy and Water Development Appropriations for 1996 no subtitle written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1995 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tailings Mine Waste written by and published by . This book was released on 2000 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monitoring Stream Stage Channel Profile and Aqueous Conductivity with Time Domain Reflectometry TDR written by James Robert Brainard and published by . This book was released on 2004 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time domain reflectometry (TDR) operates by propagating a radar frequency electromagnetic pulse down a transmission line while monitoring the reflected signal. As the electromagnetic pulse propagates along the transmission line, it is subject to impedance by the dielectric properties of the media along the transmission line (e.g., air, water, sediment), reflection at dielectric discontinuities (e.g., air-water or water-sediment interface), and attenuation by electrically conductive materials (e.g., salts, clays). Taken together, these characteristics provide a basis for integrated stream monitoring; specifically, concurrent measurement of stream stage, channel profile and aqueous conductivity. Here, we make novel application of TDR within the context of stream monitoring. Efforts toward this goal followed three critical phases. First, a means of extracting the desired stream parameters from measured TDR traces was required. Analysis was complicated by the fact that interface location and aqueous conductivity vary concurrently and multiple interfaces may be present at any time. For this reason a physically based multisection model employing the S11 scatter function and Cole-Cole parameters for dielectric dispersion and loss was developed to analyze acquired TDR traces. Second, we explored the capability of this multisection modeling approach for interpreting TDR data acquired from complex environments, such as encountered in stream monitoring. A series of laboratory tank experiments were performed in which the depth of water, depth of sediment, and conductivity were varied systematically. Comparisons between modeled and independently measured data indicate that TDR measurements can be made with an accuracy of {+-}3.4x10{sup -3} m for sensing the location of an air/water or water/sediment interface and {+-}7.4% of actual for the aqueous conductivity. Third, monitoring stations were sited on the Rio Grande and Paria rivers to evaluate performance of the TDR system under normal field conditions. At the Rio Grande site (near Central Bridge in Albuquerque, New Mexico) continuous monitoring of stream stage and aqueous conductivity was performed for 6 months. Additionally, channel profile measurements were acquired at 7 locations across the river. At the Paria site (near Lee's Ferry, Arizona) stream stage and aqueous conductivity data were collected over a 4-month period. Comparisons drawn between our TDR measurements and USGS gage data indicate that the stream stage is accurate within {+-}0.88 cm, conductivity is accurate within {+-}11% of actual, and channel profile measurements agree within {+-}1.2 cm.
Download or read book Using Time Domain Reflectometry to Measure Frost Depth and Unfrozen Water Content in Soil written by David J. Mulla and published by . This book was released on 1985 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1987 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geophysical Monitoring Probes and Their Applications to Some Hydrogeological Problems written by Laura A. Smart and published by . This book was released on 2007 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: The temperature measurements, water table measurements, and TDR measurements were to be used to correct, ground-truth, and calibrate the resistivity measurements. These objectives were made difficult by a heterogeneous vadose zone, combined with a marked drop in the top of the water-saturated zone, and difficulties with TDR installation. Numerous interesting transient and long-term changes of water content were observed despite these obstacles. Rapid data collection during and four hours following rain events gives a very intricate depiction of the infiltration of rain water through the vadose zone as well as the rise of the top of the water saturated zone. Precipitation events of greater than 10 mm significantly affect the position of the top of the water saturated zone and have been considered in detail to identify a rapid rise of water near the groundwater/surface water interface and a less rapid rise further from this interface. In addition to transient incidents, this system is ideal for long term monitoring effects. There is an indication of distinctly different infiltration patterns of precipitation and ion content of pore water over the autumn and winter months compared to the spring and summer months. This work has also identified improvements to be made to the monitoring system in the future.
Download or read book Time Domain Reflectometry Measurement of Water Content and Electrical Conductivity Using a Polyolefin Coated TDR Probe written by Gerald Ronald McIsaac and published by . This book was released on 2010 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Time Domain Reflectometer for Measuring Liquid Level written by Shreya Reddy Mamidi and published by . This book was released on 2015 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research is related to the Time Domain Reflectometer (TDR) level measurement device capable of generating and receiving electromagnetic waves. The primary objective is to measure the height of water in a tank and design an efficient measuring device. The TDR is based on the reflection mechanism, in which the time delay between the transmitted and reflected signals helps to determine the distance from the source to the surface of water, which is later used to deduce the height of water in the tank. The TDR is built using a 74AC14 IC, which is capable of producing pulse signals with very low rising and falling time that provide greater accuracy. Thus, the generated pulse signals are transmitted into the probe inserted in a tank. The total time taken by the probe to travel the path to and fro is found out, which in return helps in calculating the height of the liquid in the tank. The functioning of the proposed TDR circuit and the bi-axial probe is also tested in the laboratory.
Download or read book The Use of Time Domain Reflectometry TDR to Determine and Monitor Non aqueous Phase Liquid NAPLs in Soils written by Nabil M. Quafisheh and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
