vertically profiling Articles
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Model-Measurement Consistency and Limits of Bioaerosol Abundance Over the Continental United States
Abstract. Due to low concentrations and chemical complexity, in-situ observations of bioaerosol are geographically and temporally sparse, and this limits the accuracy of current emissions inventories. In this study, we apply a new methodology, including corrections for misidentification of mineral dust, to measurements of single particles over four airborne sampling campaigns to derive vertical ...
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An environmentally–friendly integrated seismic imaging for coal exploration in the Miocene Soma Basin, Western Turkey
Seismic reflection data from target depths of several hundred metres have been acquired and processed as an aid for lignite exploration in the Miocene Soma Basin, western Turkey. An environmentally–friendly approach was followed by acquiring the data with mini–vibroseisseismic source along crooked lines, using available mountain/forest and village roads; quality control tests were conducted to ...
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Intelligent data mining of vertical profiler readings to predict manganese concentrations in water reservoirs
Continuously monitoring and managing manganese (Mn) concentrations in drinking water supply reservoirs are paramount for water suppliers since high soluble Mn loads lead to discoloration of potable water. Despite the Mn level currently being manually sampled throughout the year, in subtropical monomictic lakes such as Hinze Dam, critical Mn concentrations in the epilimnion, where the water is ...
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Vertical Profiler Provides Continuous Monitoring In High Hypolimnetic Sulfide Concentrations - Case Study
Overview The Yigal Allon Kinneret Limnological Laboratory (KLL) is located on the NW shore of Lake Kinneret (Sea of Galilee). This lab monitors major environmental factors that determine the state of the lake and conducts limnological research aimed at understanding how present and future conditions might affect the ecosystem of the lake and the quality of its water. ...
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Sodium chloride as a tracer for hydrodynamic characterization of a shallow maturation pond
The results of tests with a sodium chloride tracer in a shallow maturation pond in Brazil are presented. The pond – a full-scale effluent treatment unit for around 250 p.e – was 0.80 m deep with a length/width ratio of 4.3:1, and had accumulated sludge for 12 years to about 40% of the total volume. The pond is subject to daily cycles of thermal stratification/destratification, as shown by ...
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Partially buried & underground tanks - Case study
Topics: potable, stratification/waterage, short-circuiting, chlorine Overview: The underground tank is a concrete rectangular structure (226' long, 166 wide, 21 ft high) built in 1968. Divided in the center, each side has a 2.5 MG storage capacity. The partially buried conical bowl tank (115' diameter, 20' high) with a geodome roof built in 1908 and refurbished in 1975, also with a 2.5 MG ...
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Geotechnical Site Characterization on a Cliff for a Dam Construction - Case Study
Background There are many cracks, joints, fractures and karstic spaces on the measurement surface of Limestone. Purpose The main subject of this study is for searching karstic features and voids within the body of local limestone for dam construction. Process The determination of resistivity was performed by geoelectric exploration method with total 28 electrodes at 6m electrode ...
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New perspectives in the use of horizontal wells for assessment and remediation
Abstract Remediation technologies can sometimes be established, but are not prevalent, for a variety of reasons; however, they can be subject to the forces of change. In some cases, creative economics promotes newuses, but also process improvements can drive newapplications and levels of acceptance. This is what is happening with the deployment of horizontal wells for site assessment and ...
By EN Rx, Inc.
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Multiple Instruments Work Together for a Better View of Air Quality
Accurately identifying and quantifying particulate matter (PM) in the atmosphere is key to determining air quality. Researchers are particularly interested in PM that have a diameter of less than 2.5 micrometers because they are believed to contribute to heart and lung disease in humans and animals. These tiny particles are invisible to the naked eye and originate from power plants, fires, and ...
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Case study – benzene contamination pilot study - retail gasoline site, Northglenn, Colorado
Introduction LTE was contracted by Shell Oil Products US (Shell) to conduct a pilot test program at a petroleum hydrocarbon impacted retail facility north of Denver, Colorado. The goals of the pilot program were to: 1) Determine the viability of using a carbon-based injectate (RPI’s BOS 200®) to remove hydrocarbons from soil and groundwater, 2) Assess transient hydraulic conditions ...
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Total Stress Probe Determination of Clay Slurry Density
The progress of sedimentation, self-weight consolidation, and gain in surface strength of a hydraulic clay fill were observed by monitoring the density improvement of the clay slurry with time. A practical method of measuring the in situ slurry density profile with depth is to employ a submersible gamma-source, backscattertype nuclear density gauge. A slurry consolidation test in the laboratory ...
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Potential Dispersion Modeling Uses of Archived NOAA Forecast Model Data
A newly-developed generation of air quality simulation models has the potential to use profiles of wind, temperature, and turbulence, as well as improved mixing height determination, measures of surface heat flux, and a host of other meteorological parameters. Several numerical weather prediction models that generate these comprehensive data sets are routinely being run by the National Oceanic ...
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Evaluation of CALPUFF modelling system performance: an application over the Greater Athens Area, Greece
This study has been carried out in order to evaluate the performance of CALPUFF modelling system in an area of complex topography. For this reason a comparison was performed between numerical results produced by this modelling system and those derived by two Eulerian models (UAM-V and REMSAD), together with experimental measurements. The meteorological input parameters, produced by the ...
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Soil and groundwater assessment, North-West England
Project Remediation Strategies were retained to undertake contamination delineation and assessment work at a logistics depot following an accidental release of a large volume of diesel. An overnight failure in a joint on a pressurised fuel pipeline had resulted in a loss of 15,000 litres of red diesel. Initial response works identified a small proportion of the diesel had entered the site ...
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Effects of meteorological data thresholding on the quality of urban HPAC predictions of the Joint Urban 2003 field trials
Comparisons of field trial observations with predictions created by the US Defense Threat Reduction Agency's Hazard Prediction and Assessment Capability (HPAC) represent an ongoing effort. Intuitively, one might prefer to include meteorological inputs as close to the release location as possible. During Joint Urban 2003, SODARs measured vertical wind profiles?upwind, within the city centre near ...
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Zasavje canyon regional online air pollution modelling system in highly complex terrain - description and validation
Zasavje is an industrial region in Slovenia located along the Sava River's steep canyon where PM10 air pollution is a major problem. In the paper a national project with the title 'Prognostic and diagnostic integrated regional air pollution modelling system' is described where it is shown that such a project can significantly contribute to the proper understanding of air pollution in smaller ...
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A large source of cloud condensation nuclei from new particle formation in the tropics
Cloud condensation nuclei (CCN) can affect cloud properties and therefore Earth’s radiative balance1–3. New particle formation (NPF) from condensable vapours in the free troposphere has been suggested to contribute to CCN, especially in remote, pristine atmospheric regions4, but direct evidence is sparse, and the magnitude of this contribution is uncertain5–7 . Here we use ...
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Micro Pulse LiDAR: A Critical Tool for Emission Source Detection
Micro Pulse LiDAR remote sensing data are used to calculate a highly accurate Planetary Boundary Layer (PBL) height to improve plume models that help assess emissions sources. Poor air quality is a growing health issue that has a negative impact on the quality of life for millions of people. To help alleviate this serious problem, scientists at Bubbleology Research International (BRI) have ...
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Assessing the transport and fate of MTBE
Untitled Document Abstract The ether oxygenates MTBE and TAME have been used in petroleum fuel formulations in the UK since the mid-1980s and have led to contamination of major aquifers with these chemicals, including the Chalk aquifer of southern England. An assessment is made of the controls on the fate of MTBE and BTEX compounds at a contaminated site on the Chalk aquifer, ...
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Case study – benzene contamination - tank battery, Weld County, Colorado
Introduction LTE was requested by Devon Energy Corporation (Devon) to remediate residual soil and groundwater impacts at an exploration and production site in Weld County, Colorado. Soil impacts were found from the surface to 24 feet below ground surface (bgs) and were a result of produced water sump and aboveground storage tank overfills. Benzene concentrations in the groundwater were up to ...
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