Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"contaminant source"”.
-
Agricultural Contaminant Source and Transport in a Karst Groundwater Basin
… and subsurface flow in karst aquifers allow for contaminants to move quickly into and through a groundwater basin. When groundwater returns to the surface via a spring or springs, any contaminants within the water become part of surface streams and rivers. These in turn, impact water quality in …
-
Investigation of how oral bioaccessibility of potentially toxic elements in urban soils is affected by contaminant source and sampling techniques
… originate from both geogenic and anthropogenic sources. Understanding their mobility, distribution, and geochemical interactions provides the necessary evidence to effectively assess the risks posed to people from exposure to soil contaminants.<br/><br/>The human health risk assessment often …
-
The optimal design of groundwater quality monitoring networks under conditions of uncertainty
… of the subsurface and the nature of the contaminant source. In addition, monitoring network design requires the resolution of multiple conflicting objectives. A method is presented that both incorporates system uncertainty in monitoring network design and provides network alternatives …
-
WATER QUALITY IMPACT OF NON-POINT SOURCE CONTAMINANTS IN SMALL TIDAL RIVERS
… was developed for analysis of non-point contaminant production and water quality impacts in estuarine receiving waters. The methodology was calibrated against contaminant source observations and estuarine data.</p><p>Contaminant source loading is based on the runoff curve number technique …
-
Quantification of Parameters in Models for Contaminant Dissolution and Desorption in Groundwater
… faced when modeling mass transfer from contaminant source zones is uncertainty regarding parameter estimates. These rate parameters are of particular importance because they control the connectivity between a simulated contaminant source zone and the aqueous phase. Where direct …
-
Reliability-Based Groundwater Monitoring System Design
… spacing and different distances from the contaminant source were evaluated. It is shown that, out of these systems, the optimal detection system is composed of closely spaced wells located near the source of contaminants. Assessment monitoring systems may be composed of two rows of wells. …
-
Numerical Modeling for the Solute Uptake from Groundwater by Plants-Plant Uptake Package
… and results for plant uptake to the SEAM3D Source Sink Mixing Package. The verification results showed an excellent match, which led to using the new package in a series of design application scenarios to evaluate phytoremediation effect. Hypothetical design scenarios included: 1) the effect …
-
A multi-disciplinary approach to tracking the downstream impacts of inadequate sanitation in Central Appalachia
… of fecal contamination, they do not pinpoint the sources of such contamination. Source assessment in rural areas affected by untreated household waste might be improved with the human-specific, microbial source tracking marker HF183. This study attempted to quantify HF183 in two particular …
-
The influence of surface - subsurface connectivity on groundwater flow and solute transport in a deltaic aquifer
… in coastal deltas provides sustainable water resources to almost five percent of the world’s population. However, it is threatened by multiple environmental issues including dense populations, urban development, and large-scale agricultural and industrial activities. The traditional …
-
Numerical approaches for sequential Bayesian optimal experimental design
… Well-chosen experiments can save substantial resources, and hence optimal experimental design (OED) seeks to quantify and maximize the value of experimental data. Common current practice for designing a sequence of experiments uses suboptimal approaches: batch (open-loop) design that chooses all …
-
Vapor intrusion modeling : limitations, improvements, and value of information analyses
… organic compounds (VOCs) from a subsurface source into the indoor air of an overlying building. Vapor intrusion models, including the Johnson and Ettinger (J&E) model, can be used to predict the concentration of VOCs in the indoor air of a building based on a measured subsurface soil gas …
-
Understanding the nonaqueous partitioning of per- and poly-fluoroalkyl substances (PFAS)
… polyfluoroalkyl substances (PFAS) are emerging contaminants that have been extensively used as firefighting agents and released to the environment, accumulating in waters, soils, and the atmosphere. PFAS are known to bioaccumulate, leading to adverse health outcomes. Therefore, understanding the …
-
Goal-oriented inference : theoretical foundations and application to carbon capture and storage
… subspace reveals inefficiency in experiment and sources of uncertainty in predictions, which can also be utilized in experimental design. Linear goal-oriented inference is demonstrated on a model problem in contaminant source inversion and prediction. In the nonlinear setting, we focus on the …
-
Characterisation of Treated Timber Sources of Pesticide Contaminants using Source Modelling Techniques
Exposure to indoor air contaminants is recognised as a major contributor to human health risk. Level of contaminants are generally higher indoors than outdoors. As people spend 80 to 90% of their time indoors, these elevated contaminant levels cause high exposures which may increase the risk of …
-
Lokální větrání v průmyslových provozech
Tato bakalářská práce se zabývá problematikou lokálního větrání v průmyslových prostorech. Na začátku práce jsou uvedeny důvody, proč je větrání důležité. V kapitole uvedeny legislativní předpisy i technické požadavky, aby měl pracovník obecnou pohodu při práci. Dále je provedeno rozdělení druhů a …