geostatistics Articles
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Dealing with spatial heterogeneity
Heterogeneity can be dealt with by defining homogeneous equivalent properties, known as averaging, or by trying to describe the spatial variability of the rock properties from geologic observations and local measurements. The techniques available for these descriptions are mostly continuous Geostatistical models, or discontinuous facies models such as the Boolean, Indicator or Gaussian-Threshold ...
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Characterization Of A Deep Radiological Contamination: Integration Of Geostatistical Processing And Historical Data
Summary Emerging in the early 80’s, decommissioning is more than ever a major issue since hundreds of sites and facilities worldwide will end their operations over the next decades. Decontamination and remediation projects are all the more sensitive since they could last several years and turn out to be highly costly if not well-prepared. The key lies in an adequate contamination knowledge ...
By Geovariances
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Environmental forensics investigation
Location: Vancouver, BC Owner: Confidential Description: Environmental forensics investigation ongoing to determine the source of chlorinated solvents (PCE, TCE, 1,1,1-TCA1,1,DCE) and 1,2-dichlorobenzene contamination at a site that has changed owners in the past 25 years. Advanced Forensic Techniques used include hydrolysis equation for dating groundwater contamination, molar ratios, date ...
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Geostatistically based optimization of a rainfall monitoring network extension: case of the climatically heterogeneous Tunisia
Rainfall data are an essential input for many simulation models. In fact, these latter have a decisive role in the development and application of rational water policies. Since the accuracy of the simulation depends strongly on the available data, the task of optimizing the monitoring network is of great importance. In this paper, an application is presented aiming at the evaluation of a ...
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Some aspects of physiologic climatology in Nigeria
This study discusses the focus of researches in climate science in Nigeria with the view of identifying important gaps in knowledge in the publications in the field. The study used both expository review and geostatistics to present its results. The general overview of the field of climatology in Nigeria showed that Nigerian rainfall has been well studied while information on most other climate ...
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Geostatistical techniques for approximate location of pipe burst events in water distribution systems
This paper focusses on the customisation and further enhancement of the recently developed data-driven methodology for the automated near real-time detection of pipe bursts and other (e.g. sensor faults) events at the district metered area (DMA) level. Assuming the availability of pressure/flow data from an increased number of sensors deployed in a DMA, the aim is to: (i) overcome the ...
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Spatial variability of nutrients (N, P) in a deep, temperate lake with a low trophic level supported by global navigation satellite systems, geographic information system and geostatistics
We investigated changes in the spatial distribution of phosphorus (P) and nitrogen (N) in the deep, mesotrophic Lake Hańcza. The raw data collection, supported by global navigation satellite system (GNSS) positioning, was conducted on 79 sampling points. A geostatistical method (kriging) was applied in spatial interpolation. Despite the relatively small area of the lake (3.04 km2), ...
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Kartotrak.one, The Easy Route to Site Remediation
Geovariances launches Kartotrak.one, an easy-to-use and fast application for thorough data quality control and accurate contamination mapping. Kartotrak.one is a light version of Kartotrak. The software gathers Kartotrak exploratory data analysis and rapid mapping functionalities. Kartotrak, in its full version, enables more advanced geostatistical data modeling and uncertainty quantification ...
By Geovariances
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A study of atmospheric particulate matter in a city of the central region of Brazil using time-series analysis
Uberlandia is an important city of the Brazil central region. In this work, the Total Suspended Particles (TSP) and particles smaller than 10 μm (PM10) were sampled from 2003 to 2006. The Geostatistical technique was used to evaluate the temporal dependence and the time-series analysis with 2004 and 2005 data was used to predict 2006 values. The selection of the best model was conducted using ...
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The geostatistical reassessment of soil contamination with lead in metropolitan Warsaw and its vicinity
Soils of urban agglomerations are often exposed to pollution with lead, which high concentrations are frequently observed. The main sources of lead contamination are airborne particulate depositions and exhaust fumes. The study area encompassed Warsaw city, outskirts and fragments of Kampinoski National and Mazowiecki Landscape Parks. The scope of the study was to analyse the spatial distribution ...
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Geostatistics-based spatial variation characteristics of groundwater levels in a wastewater irrigation area, northern China
Although wastewater reuse in agriculture can ease water scarcity, this practice also alters the variation of groundwater recharge and groundwater levels. This study employed a geostatistical method to systematically investigate the spatio-temporal variations and storage fluctuations of groundwater in a wastewater irrigation area in a southeastern suburb of Beijing. Specifically, we generated ...
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Groundwater level response to hydrogeological factors in a semi-arid basin of Beijing, China
In this study, the mode of groundwater level fluctuations is analyzed by statistical approaches for 51 monitoring wells located in a semi-arid basin in Beijing from 1998 to 2013. Firstly, a geostatistical method was performed to characterize the spatial and temporal behaviors of data sets and analyze the responding mechanism of groundwater level to hydrologic features using the Geostatistics ...
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Chemistry and mineralogy studies of PM
10atmospheric aerosols in the Gulf of Gabès, South TunisiaThis study provides a comprehensive report on mass concentrations, chemical composition and mineralogy characterisations of PM10 atmospheric aerosols in the Gulf of Gabès, in South Tunisia. Data were collected at 18 locations (sample points in urban zones with industrial influence). Principally, they were located near the industrial complex. At each sample point, PM10 was measured, with a mobile ...
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Spatial interpolation of cadmium contamination of agricultural soils in Changhua County, Taiwan
A robust spatial model to interpolate topsoil cadmium concentrations monitored by Taiwan EPA was constructed for assessment of health risks posed by this contamination in Changhua County, Taiwan. kriging methods, using a Geographic Information Systems (GIS), were used to estimate the range and severity of topsoil contamination. Optimised Kriging models and geostatistical analyses revealed that ...
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Geostatistical interpolation of object counts collected from multiple strip transects: Ordinary kriging versus finite domain kriging
Data collected along transects are becoming more common in environmental studies as indirect measurement devices, such as geophysical sensors, that can be attached to mobile platforms become more prevalent. Because exhaustive sampling is not always possible under constraints of time and costs, geostatistical interpolation techniques are used to estimate unknown values at unsampled locations from ...
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Exploring GIS, spatial statistics and remote sensing for risk assessment of vector-borne diseases: a West Nile virus example
Vector-borne diseases pose a continuing health risk to the global population. In the United States, the spread of West Niles virus (WNV) in the past several years across the country has been alarming. Using WNV as an example, this paper demonstrates how geographic information science (GIScience) and attendant technologies in remote sensing, geographic information systems (GIS), and spatial ...
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The future of stochastic and upscaling methods in hydrogeology
Geological formations are complex features resulting from geological, mechanical, and physico-chemical processes occurring over a very wide range of length scales and time scales. Transport phenomena ranging from the molecular scale to several hundreds of kilometers may influence the overall behavior of fluid flow in these formations. Heterogeneities that cover a large range of spatial scales ...
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Monitoring the effects on the water balance of the Garzweiler open pit mine: concepts, methods and experience
In western Germany brown coal is extracted in large open pit mines causing a vast groundwater depression. To reduce the negative effects an extensive program of re-infiltration has been established. Based on guidelines for mining at the Garzweiler open pit mine a specific monitoring program of spatial surveillance, control and assessment of relevant hydrological and ecological parameters has been ...
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Automatic mapping in emergency: a geostatistical perspective
In the case of a severe nuclear accident, radionuclides may be released into the atmosphere and contaminate large areas. Radiological maps are obtained after converting local measurements into continuous information in space. Ideally, the mapping process should be fully automatic and provide information in real time. This paper is presenting the results obtained from two statistical exercises ...
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Spatial pattern of arsenic contamination in shallow wells of Bangladesh: regional geology and nonlinear dynamics
Since the discovery of large-scale arsenic contamination of groundwater in Bangladesh more than a decade ago, studies related to its spatial characterization have relied on geostatistical approaches and the classical notion of linear stochastic dynamics. This study explores an alternative nonlinear approach, with a motivation to possibly achieve more cost-effective solutions for Bangladesh. It ...
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