Geological Modeling Articles | Environmental XPRT

Quantitative Analysis of Geological Samples- X-Calibur

Abstract Quantitative and qualitative analysis of geological samples (rocks and river sediments) was performed on Xenemetrix EDXRF Benchtop Spectrometer System, model X-Calibur Objective: Perform XRF measurements on certified geological reference materials to build calibration curves for the major oxides (Na2O, MgO, SiO2, Al2O3, SiO2, P2O5, ...

Aug. 1, 2017

By Xenemetrix Ltd.

Questioning the applicability of the areal leakage factor as a constant hydro-geological parameter

The differential equation of the flow through a leaky aquifer considers the leakage factor a constant hydro-geological parameter. The purpose of this research paper is to examine the suitability of this constant for the simulation of the distribution of the piezometric heads through leaky aquifers. To perform this task, a proposed explicit finite difference scheme for the determination of the ...

Dec. 22, 2014

By Inderscience Publishers

Safety/risk assessment methodologies of deep geological facilities: results from a cross–national comparison

Any geological disposal/storage facility must prove its safe performance prior to licensing, regardless of whether the compound is solid radioactive waste (RW) or gaseous carbon dioxide (CO2). The disposal/storage facility is considered safe if it meets the relevant safety standards and proves its reliable safe performance over defined timescales. This paper presents a ...

Oct. 29, 2014

By Inderscience Publishers

Progress on water data integration and distribution: a summary of select US Geological Survey data systems

Critical water-resources issues ranging from flood response to water scarcity make access to integrated water information, services, tools, and models essential. Since 1995 when the first water data web pages went online, the US Geological Survey has been at the forefront of water data distribution and integration. Today, real-time and historical streamflow observations are available via web ...

Jul. 31, 2015

By IWA Publishing

The hidden benefits of maturity modelling

Most 1–D modelling studies are carried out with the explicit objective of calculating maturity and hydrocarbon generation. This focus on bottom–line output has caused most modellers to overlook a major additional value of such studies: the knowledge acquired while building internally consistent geologic models. During model construction one should carefully consider the following factors: events ...

Dec. 4, 2012

By Inderscience Publishers

Application of Advanced Modelling Tools to Evaluate Uncertainty in Modelling Predictions

With any modelling prediction there is a degree of uncertainty that corresponds to the uncertainty in defining hydraulic and chemical parameters spatially throughout the model domain. With geologic investigations we must interpolate between point information (borehole logs) to define continuous spatial properties through the model area. In addition, many parameters such as effective porosity and ...

Jan. 1, 2000

Metal Mixture Modeling Evaluation project: 2. Comparison of four modeling approaches

As part of the Metal Mixture Modeling Evaluation (MMME) project, models were developed by the National Institute of Advanced Industrial Science and Technology (Japan), the U.S. Geological Survey (USA), HDR׀HydroQual, Inc. (USA), and the Centre for Ecology and Hydrology (UK) to address the effects of metal mixtures on biological responses of aquatic organisms. A comparison of the 4 models, as ...

Nov. 24, 2014

By John Wiley & Sons, Ltd.

Method and technique of 3–D dynamic structural evolution modelling of fault basin

The important and difficult point in the 3–D basin structural evolution modelling is how to make the modelling conform to the real geological process. In this paper, the rectification of formation boundary deformation is implemented by 3–D flexural slip mechanism and shearing mechanism. In compaction correction, by taking account of the phase boundary and diagenetic effect on porosity, a formwork ...

Dec. 4, 2012

By Inderscience Publishers

Modeling Leachate Contamination and Remediation of Groundwater at a Landfill Site

Leachate contamination of an aquifer from a landfill sitewas simulated using the groundwater flow and transport model SUTRA developed by the U.S. Geological Survey. The model calibration was performed by spatially adjusting the hydraulic conductivity in order to capture the measured hydraulic head spatial variation and then by adjusting the dispersivity and porosity match the measured chloride ...

Mar. 21, 2005

By Springer

USGS surveys, models high plains groundwater resources

A United States Geological Survey publication and model of groundwater resources in the Northern High Plains aquifer can be used to better understand the region’s water resources, a critical component of scientific water management. This type of comprehensive study has not been made in more than 30 years The models can be used to assess the flow, quantity, sources, and sinks of groundwater ...

Mar. 17, 2017

By Fluence Corporation

Modelling of coastal hydrogeology of Krishna delta in India

Numerical techniques are widely used for modelling groundwater aquifers. Hydrological models are generally concept based and highly non-linear due to complex parameterisation as compared to models of other disciplines. Calibration and validation of such models cannot follow conventional methods borrowed from other disciplines many times due to scale of the model domain. In the present paper, ...

Oct. 1, 2010

By Inderscience Publishers

Researchers: Current global groundwater recharge models inaccurate

A large-scale analysis of existing water resource models used around the world has found some key processes are missing, which means estimates of water availability could be wrong and cannot be reliably used for making water management decisions. The international team of scientists found that important climate change impact models are wrong in some areas. One finding was that groundwater ...

May 17, 2017

By Fluence Corporation

Optimal solute transport in heterogeneous aquifer: coupled inverse modelling

Characterisation of transmissivity heterogeneity is critical for groundwater flow and solute transport. The heterogeneity of transmissivity is studied through variogram-based techniques. Conventionally, the parameters in variogram are obtained by fitting measurements to a theoretical variogram. However, conditioning to the sampled geological variables neglects the effects of observed ...

Aug. 12, 2010

By Inderscience Publishers

$Assessment of uncertainty in discrete fracture network modeling using probabilistic distribution method$

Assessment of uncertainty in discrete fracture network modeling using probabilistic distribution method

There have been widespread concerns about solute transport problems in fractured media, e.g. the disposal of high-level radioactive waste in geological fractured rocks. Numerical simulation of particle tracking is gradually being employed to address these issues. Traditional predictions of radioactive waste transport using discrete fracture network (DFN) models often consider one particular ...

Aug. 4, 2017

By IWA Publishing

Assessing the human-environment relationship: a complex-systems methodology to modelling climate change

Climate change is at the forefront of scientific investigation and socio-political decision-making. The world community of scientists concur with the fact that human activities are both contributing to and affected by changes in the environment that influence the overall well-being of the world population. Importantly, these changes do not discriminate as to region or inhabitants. The body of ...

Nov. 28, 2011

By Inderscience Publishers

Modelling spatio-temporal heterogeneities in groundwater quality in Ghana: a multivariate chemometric approach

Chemometric techniques were applied to evaluate the spatial and temporal heterogeneities in groundwater quality data for approximately 740 goldmining and agriculture-intensive locations in Ghana. The strongest linear and monotonic relationships occurred between Mn and Fe. Sixty-nine per cent of total variance in the dataset was explained by four variance factors: physicochemical properties, ...

May 26, 2017

By IWA Publishing

Nonpoint-source nitrogen and phosphorus behavior and modeling in cold climate: a review

Pollution from nonpoint-source (NPS) nitrogen (N) and phosphorus (P) are the main causes of eutrophication in lotic, lentic and coastal systems. The climate of cold regions might play an important role in disturbing environmental behavior of NPS N and P, influencing simulation of watershed scale hydrologic and nonpoint-source pollution models. The losses of NPS N and P increase in regions of cold ...

Nov. 1, 2010

By IWA Publishing

A model for wave control on coral breakage and species distribution in the Hawaiian Islands

The fringing reef off southern Molokai, Hawaii, is currently being studied as part of a multi-disciplinary project led by the US Geological Survey. As part of this study, modeling and field observations were utilized to help understand the physical controls on reef morphology and the distribution of different coral species. A model was developed that calculates wave-induced hydrodynamic forces on ...

Mar. 1, 2005

By Springer

What’s the Temperature? Thermal Modeling and its Importance in Thermal Remediation

What is a model? A beautiful person who struts down a run way, a scaled down sculpture of the Empire State Building, or a series of equations that describe some phenomenon? Did you guess all of the above? Gold star! Models come in many different shapes and sizes. In the environmental consulting and remediation industry, the word “model” often refers to a numerical model. Numerical ...

Mar. 24, 2016

By TerraTherm, Inc.

Groundwater flow modeling to support water management scenarios – the Bekaa Valley, Lebanon

The Italian Ministry of Foreign Affairs funded a project aimed at developing tools for water management in the Bekaa valley, Lebanon. The Lebanese Ministry of Energy and Water implemented the project, supported by the University of Milan Department of Agricultural and Environmental Sciences (DISAA). The geologic framework consists of a cretacean-eocean carbonatic structure, crossed by a fracture ...

Mar. 1, 2016

By Tethys srl

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